10-Q

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

 ______________________________________

FORM 10-Q

______________________________________ 

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2015

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from            To                

Commission file number 0-12508

______________________________________ 

S&T BANCORP, INC.

(Exact name of registrant as specified in its charter)

______________________________________ 

Pennsylvania	25-1434426
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)
800 Philadelphia Street, Indiana, PA	15701
(Address of principal executive offices)	(zip code)

800-325-2265

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address, and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x

APPLICABLE ONLY TO CORPORATE ISSUERS:

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practical date.

Common Stock, $2.50 Par Value - 34,811,636 shares as of July 31, 2015

S&T BANCORP, INC. AND SUBSIDIARIES

INDEX

S&T BANCORP, INC. AND SUBSIDIARIES

		Page No.
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets - June 30, 2015 and December 31, 2014	3
	Consolidated Statements of Comprehensive Income - Three and Six Months Ended June 30, 2015 and 2014	4
	Consolidated Statements of Changes in Shareholders' Equity - Six Months Ended June 30, 2015 and 2014	5
	Consolidated Statements of Cash Flows - Six Months Ended June 30, 2015 and 2014	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	45
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	61
Item 4.	Controls and Procedures	62
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	64
Item 1A.	Risk Factors	64
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	64
Item 3.	Defaults Upon Senior Securities	64
Item 4.	Mine Safety Disclosures	64
Item 5.	Other Information	64
Item 6.	Exhibits	65
	Signatures	66

2

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unaudited)

	June 30, 2015			December 31, 2014
(dollars in thousands, except per share data)	(Unaudited)			(Audited)
ASSETS
Cash and due from banks, including interest-bearing deposits of $83,701 and $57,048 at June 30, 2015 and December 31, 2014	$	146,582		$	109,580
Securities available-for-sale, at fair value	666,624			640,273
Loans held for sale	13,634			2,970
Portfolio loans, net of unearned income	4,798,498			3,868,746
Allowance for loan losses	(48,814		)	(47,911		)
Portfolio loans, net	4,749,684			3,820,835
Bank owned life insurance	79,314			62,252
Premises and equipment, net	49,032			38,166
Federal Home Loan Bank and other restricted stock, at cost	23,553			15,135
Goodwill	291,204			175,820
Other intangible assets, net	7,479			2,631
Other assets	106,622			97,024
Total Assets	$	6,133,728		$	4,964,686
LIABILITIES
Deposits:
Noninterest-bearing demand	$	1,182,124		$	1,083,919
Interest-bearing demand	703,797			335,099
Money market	633,175			376,612
Savings	1,093,057			1,027,095
Certificates of deposit	1,247,262			1,086,117
Total Deposits	4,859,415			3,908,842
Securities sold under repurchase agreements	46,235			30,605
Short-term borrowings	230,975			290,000
Long-term borrowings	118,228			19,442
Junior subordinated debt securities	45,619			45,619
Other liabilities	62,027			61,789
Total Liabilities	5,362,499			4,356,297
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—36,130,480 shares at June 30, 2015 and 31,197,365 at December 31, 2014 Outstanding—34,812,723 shares at June 30, 2015 and 29,796,397 shares at December 31, 2014	90,326			77,993
Additional paid-in capital	209,709			78,818
Retained earnings	521,056			504,060
Accumulated other comprehensive (loss) income	(13,521		)	(13,833		)
Treasury stock (1,317,757 shares at June 30, 2015 and 1,400,968 shares at December 31, 2014, at cost)	(36,341		)	(38,649		)
Total Shareholders’ Equity	771,229			608,389
Total Liabilities and Shareholders’ Equity	$	6,133,728		$	4,964,686

See Notes to Consolidated Financial Statements

3

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands, except per share data)	2015			2014			2015			2014
INTEREST INCOME
Loans, including fees	$	48,933		$	36,614		$	88,859		$	72,263
Investment Securities:
Taxable	2,394			2,060			4,777			3,960
Tax-exempt	998			979			2,018			1,908
Dividends	286			219			872			406
Total Interest Income	52,611			39,872			96,526			78,537
INTEREST EXPENSE
Deposits	3,051			2,476			6,058			4,986
Borrowings and junior subordinated debt securities	749			541			1,398			1,105
Total Interest Expense	3,800			3,017			7,456			6,091
NET INTEREST INCOME	48,811			36,855			89,070			72,446
Provision for loan losses	2,059			(1,134		)	3,266			(845		)
Net Interest Income After Provision for Loan Losses	46,752			37,989			85,804			73,291
NONINTEREST INCOME
Securities (losses) gains, net	(34		)	40			(34		)	41
Debit and credit card fees	3,020			2,724			5,736			5,226
Wealth management fees	2,930			2,837			5,853			5,792
Service charges on deposit accounts	2,877			2,574			5,459			5,083
Insurance fees	1,391			1,425			3,041			3,102
Mortgage banking	782			264			1,308			396
Other	2,417			1,907			4,104			3,547
Total Noninterest Income	13,383			11,771			25,467			23,187
NONINTEREST EXPENSE
Salaries and employee benefits	17,455			15,772			34,235			31,148
Net occupancy	2,682			1,984			5,270			4,214
Data processing	2,555			2,219			4,876			4,314
Furniture and equipment	1,582			1,277			2,808			2,548
Marketing	1,193			960			2,009			1,578
Other taxes	1,159			893			2,002			1,524
Merger related expenses	866			—			3,167			—
FDIC insurance	808			579			1,503			1,210
Professional services and legal	801			875			1,324			1,538
Other	6,348			5,606			11,876			11,005
Total Noninterest Expense	35,449			30,165			69,070			59,079
Income Before Taxes	24,686			19,595			42,201			37,399
Provision for income taxes	6,498			4,875			11,178			8,646
Net Income	$	18,188		$	14,720		$	31,023		$	28,753
Earnings per share—basic	$	0.52		$	0.49		$	0.94		$	0.97
Earnings per share—diluted	$	0.52		$	0.49		$	0.94		$	0.97
Dividends declared per share	$	0.18		$	0.17		$	0.36		$	0.33
Comprehensive Income	$	14,695		$	18,343		$	31,335		$	35,421

See Notes to Consolidated Financial Statements

4

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY

(Unaudited)

(dollars in thousands, except shares and per share data)	Common Stock		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive (Loss)/Income			Treasury Stock			Total
Balance at January 1, 2014	$	77,993	$	78,140		$	468,158		$	(12,694	)	$	(40,291	)	$	571,306
Net income for six months ended June 30, 2014	—		—			28,753			—			—			28,753
Other comprehensive income (loss), net of tax	—		—			—			6,668			—			6,668
Cash dividends declared ($0.33 per share)	—		—			(9,810		)	—			—			(9,810		)
Treasury stock issued for restricted awards (80,455 shares, net of 20,976 forfeitures)	—		—			(1,824		)	—			1,664			(160		)
Recognition of restricted stock compensation expense	—		430			—			—			—			430
Balance at June 30, 2014	$	77,993	$	78,570		$	485,277		$	(6,026	)	$	(38,627	)	$	597,187
Balance at January 1, 2015	$	77,993	$	78,818		$	504,060		$	(13,833	)	$	(38,649	)	$	608,389
Net income for six months ended June 30, 2015	—		—			31,023			—			—			31,023
Other comprehensive income (loss), net of tax	—		—			—			312			—			312
Cash dividends declared ($0.36 per share)	—		—			(11,608		)	—			—			(11,608		)
Common stock issued in acquisition (4,933,115 shares)	12,333		130,136			—			—			—			142,469
Treasury stock issued for restricted awards (87,841 shares, net of 4,630 forfeitures)	—		—			(2,419		)	—			2,308			(111		)
Recognition of restricted stock compensation expense	—		858			—			—			—			858
Tax benefit from stock-based compensation			29												29
Issuance costs	—		(132		)	—			—			—			(132		)
Balance at June 30, 2015	$	90,326	$	209,709		$	521,056		$	(13,521	)	$	(36,341	)	$	771,229

See Notes to Consolidated Financial Statements

5

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Six Months Ended June 30,
(dollars in thousands)	2015			2014
OPERATING ACTIVITIES
Net income	$	31,023		$	28,753
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,266			(845		)
Provision for unfunded loan commitments	605			182
Depreciation, amortization and accretion	388			2,309
Net amortization of discounts and premiums on securities	1,802			1,898
Stock-based compensation expense	769			395
Securities losses (gains), net	34			(41		)
Tax benefit from stock-based compensation	(29		)	—
Mortgage loans originated for sale	(52,075		)	(13,057		)
Proceeds from the sale of loans	42,008			13,475
Gain on the sale of loans, net	(597		)	(85		)
Net increase in interest receivable	(2,542		)	(243		)
Net decrease in interest payable	(475		)	(186		)
Net decrease in other assets	1,854			10,016
Net (decrease) increase in other liabilities	(811		)	1,199
Net Cash Provided by Operating Activities	25,220			43,770
INVESTING ACTIVITIES
Purchases of securities available-for-sale	(54,754		)	(108,845		)
Proceeds from maturities, prepayments and calls of securities available-for-sale	26,096			36,343
Proceeds from sales of securities available-for-sale	11,119			1,418
Net purchases of Federal Home Loan Bank stock	(334		)	(2,189		)
Net increase in loans	(141,911		)	(169,209		)
Proceeds from sale of loans not originated for resale	—			4,108
Purchases of premises and equipment	(2,465		)	(1,719		)
Proceeds from the sale of premises and equipment	27			64
Net cash paid in excess of cash acquired from bank merger	(16,347		)	—
Net Cash Used in Investing Activities	(178,569		)	(240,029		)
FINANCING ACTIVITIES
Net increase in core deposits	297,340			141,888
Net (decrease) increase in certificates of deposit	(68,397		)	50,972
Net increase (decrease) in securities sold under repurchase agreements	15,630			(8,578		)
Net (decrease) increase in short-term borrowings	(127,686		)	45,000
Proceeds from long-term borrowings	100,000			—
Repayments of long-term borrowings	(1,214		)	(1,174		)
Repayment of junior subordinated debt	(13,500		)	—
Treasury shares issued-net	(111		)	(160		)
Issuance costs	(132		)	—
Cash dividends paid to common shareholders	(11,608		)	(9,810		)
Tax benefit from stock-based compensation	29			—
Net Cash Provided by Financing Activities	190,351			218,138
Net increase in cash and cash equivalents	37,002			21,879
Cash and cash equivalents at beginning of period	109,580			108,356
Cash and Cash Equivalents at End of Period	$	146,582		$	130,235
Supplemental Disclosures
Loans transferred to held for sale	$	—		$	1,300
Interest paid	$	7,619		$	6,278
Income taxes paid, net of refunds	$	9,275		$	8,400
Net assets acquired from bank merger, excluding cash and cash equivalents	$	43,433		$	—
Transfers of loans to other real estate owned	$	137		$	274

See Notes to Consolidated Financial Statements

6

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1. BASIS OF PRESENTATION

Principles of Consolidation

The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

Basis of Presentation

The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our annual report on Form 10-K for the year ended December 31, 2014, filed with the Securities and Exchange Commission, or SEC, on February 20, 2015. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

Reclassification

Certain amounts in the prior periods’ financial statements and footnotes have been reclassified to conform to the current period’s presentation. The reclassifications had no significant effect on our results of operations or financial condition.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Recently Adopted Accounting Standards Updates, or ASU

Repurchase-To-Maturity Transactions, Repurchase Financings, and Disclosures

In June 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures which introduces two accounting changes to the Transfers and Servicing guidance (Topic 860). Repurchase-to-maturity transactions will be accounted for as secured borrowing transactions on the balance sheet and for repurchase financing arrangements, an entity will account separately for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. This will also generally result in secured borrowing accounting for the repurchase agreement. With respect to disclosures, a transferor is required to disclose information about transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the transferee. Additionally, new disclosures are required for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The new disclosure for transactions accounted for as secured borrowings is required for interim periods beginning after March 15, 2015. These new disclosures are included in Note 9. Borrowings. The adoption of this ASU had no impact on our results of operations or financial position.

Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity

In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. The guidance applies to all entities that dispose of components. It will significantly change current practices for assessing discontinued operations and affect an entity’s income and earnings per share from continuing operations. An entity is required to reclassify assets and liabilities of a discontinued operation that are classified as held for sale or disposed of in the current period for all comparative periods presented. The ASU requires that an entity present in the statement of cash flows or disclose in a note either total operating and investing cash flows for discontinued operations, or depreciation, amortization, capital expenditures and significant operating and investing noncash items related to

7

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 1. BASIS OF PRESENTATION - continued

discontinued operations. Additional disclosures are required when an entity retains significant continuing involvement with a discontinued operation after its disposal, including the amount of cash flows to and from a discontinued operation. The new standard applies prospectively after the effective date of December 15, 2014, and early adoption was permitted. The adoption of this ASU had no impact on our results of operations or financial position.

Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure

In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The ASU clarifies that an in substance repossession or foreclosure has occurred and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure. Interim and annual disclosure is required of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The new standard is effective using either the modified retrospective transition method or a prospective transition method for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption was permitted. The adoption of this ASU had no impact on our results of operations or financial position.

Accounting for Investments in Qualified Affordable Housing Projects

In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. The proportional amortization method permits the amortization of the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption was permitted. This ASU did not have a material impact on our results of operations or financial position. We did not adopt the proportional amortization method. Refer to Note 14 for additional disclosure.

Recently Issued Accounting Standards Updates not yet Adopted

Intangibles – Goodwill and Other – Internal-Use Software: Customer's Accounting for Fees Paid in a Cloud Computing Arrangement

In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. The main provisions of ASU 2015-05 provide a basis for evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, then the arrangement should be accounted for as a service contract. The standard is effective for annual periods and interim periods beginning after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Interest – Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs

In April 2015, the FASB issued ASU No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. We do not expect that this ASU will have a material impact on our results of operations or financial position.

8

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 1. BASIS OF PRESENTATION - continued

Consolidation: Amendments to the Consolidation Analysis

In April 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The amendments in this ASU affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. Specifically, the amendments: 1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, 2) Eliminate the presumption that a general partner should consolidate a limited partnership, 3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, 4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2A-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this ASU are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. We are currently evaluating the impact that these amendments may have on our consolidated financial statements. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Income Statement – Extraordinary and Unusual Items: Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary

In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary. The amendments in this ASU eliminate from GAAP the concept of extraordinary items and eliminate the requirements for reporting entities to consider whether an underlying event or transaction is extraordinary. The presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

9

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 2. BUSINESS COMBINATIONS

On March 4, 2015, we completed the acquisition of 100 percent of the voting shares of Integrity Bancshares, Inc., or Integrity, located in Camp Hill, Pennsylvania, in a tax-free reorganization transaction structured as a merger of Integrity with and into S&T, with S&T being the surviving entity. As a result of the Integrity merger, or the Merger, Integrity Bank, the wholly owned subsidiary bank of Integrity, became a separate wholly owned subsidiary bank of S&T. The merger of Integrity Bank into S&T Bank, with S&T Bank surviving the merger, and related system conversion occurred on May 8, 2015.

Integrity shareholders were entitled to elect to receive for each share of Integrity common stock either $52.50 in cash or 2.0627 shares of S&T common stock subject to allocation and proration procedures in the merger agreement. The total purchase price was approximately $172.0 million which included $29.5 million of cash and 4,933,115 S&T common shares at a fair value of $28.88 per share. The fair value of $28.88 per share of S&T common stock was based on the March 4, 2015 closing price.

The Merger was accounted for under the acquisition method of accounting and our consolidated financial statements include all Integrity Bank transactions from March 4, 2015, until it was merged into S&T Bank on May 8, 2015. The assets acquired and liabilities assumed were recorded at their respective fair values and represent management’s estimates based on available information. During the three months ended June 30, 2015, an additional $0.6 million of purchase accounting adjustments were recognized that increased goodwill. The change to goodwill primarily related to a fair value adjustment made on land acquired in the Merger where we own a branch office.

Goodwill of $115.4 million was calculated as the excess of the consideration exchanged over the fair value of the identifiable net assets acquired. The goodwill arising from the Merger consists largely of the synergies and economies of scale expected from combining the operations of S&T and Integrity. All of the goodwill was assigned to our Community Banking segment. The goodwill recognized will not be deductible for tax purposes.

The following table summarizes total consideration, assets acquired and liabilities assumed as of June 30, 2015:

(dollars in thousands)
Consideration Paid
Cash	$	29,510
Common stock	142,469
Fair Value of Total Consideration	$	171,979
Fair Value of Assets Acquired
Cash and cash equivalents	$	13,163
Securities and other investments	11,502
Loans	788,687
Bank owned life insurance	15,974
Premises and equipment	10,855
Core deposit intangible	5,713
Other assets	19,555
Total Assets Acquired	865,449
Fair Value of Liabilities Assumed
Deposits	722,308
Borrowings	82,286
Other liabilities	4,259
Total Liabilities Assumed	808,853
Total Fair Value of Identifiable Net Assets	56,596
Goodwill	$	115,383

Loans acquired in the Merger were recorded at fair value with no carryover of the related allowance for loan losses. Determining the fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Loans acquired with evidence of credit quality deterioration were evaluated and not considered to be significant. The fair value of the loans acquired was $788.7 million net of a $14.8 million discount. The discount may be accreted to interest income over the remaining contractual life of the loans. Acquired loans included $331.6 million of commercial real estate, or CRE, $184.2 million of commercial and

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 2. BUSINESS COMBINATIONS - continued

industrial, or C&I, $92.4 million of commercial construction, $116.9 million of residential mortgage, $25.6 million of home equity, $36.1 million of installment and other consumer and $1.9 million of consumer construction.

Direct costs related to the Merger were expensed as incurred. During the six months ended June 30, 2015, we recognized $3.2 million of merger related expenses, including $1.3 million for data processing contract termination and system conversion costs, $1.2 million in legal and professional expenses, $0.4 million in severance payments and $0.3 million in other expenses.

The following table presents unaudited pro forma financial information which combines the historical consolidated statements of income of S&T and Integrity to give effect to the Merger as if it had occurred on January 1, 2014, for the periods presented.

	Unaudited Pro Forma Information
	Three Months Ended June 30,				Six Months Ended June 30,
(dollars in thousands, except per share data)	2015		2014		2015		2014
Total revenue(1)	$	60,307	$	57,921	$	118,992	$	115,045
Net income (2)	$	18,816	$	17,765	$	32,728	$	33,697
Earnings per common share: (2)
Basic	$	0.54	$	0.51	$	0.95	$	0.97
Diluted	$	0.54	$	0.51	$	0.94	$	0.97

⁽¹⁾Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale.

⁽²⁾Excludes merger expenses

Pro forma adjustments include intangible amortization expense, net amortization or accretion of valuation amounts and income tax expense. The pro forma results are not indicative of the results of operations that would have occurred had the Merger taken place at the beginning of the periods presented nor are they intended to be indicative of results that may occur in the future.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 3. EARNINGS PER SHARE

The following table reconciles the components of basic earnings per share with that of diluted earnings per share for the periods presented:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except shares and per share data)	2015		2014		2015		2014
Numerator for Earnings per Share—Basic:
Net income	$	18,188	$	14,720	$	31,023	$	28,753
Less: Income allocated to participating shares	79		29		123		64
Net Income Allocated to Shareholders	$	18,109	$	14,691	$	30,900	$	28,689
Numerator for Earnings per Share—Diluted:
Net income	18,188		14,720		$	31,023	$	28,753
Net Income Available to Shareholders	$	18,188	$	14,720	$	31,023	$	28,753
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic	34,652,895		29,684,300		32,951,936		29,672,611
Add: Potentially dilutive shares	28,283		16,894		36,359		27,559
Denominator for Treasury Stock Method—Diluted	34,681,178		29,701,194		32,988,295		29,700,170
Weighted Average Shares Outstanding—Basic	34,652,895		29,684,300		32,951,936		29,672,611
Add: Average participating shares outstanding	151,134		58,973		131,563		66,563
Denominator for Two-Class Method—Diluted	34,804,029		29,743,273		33,083,499		29,739,174
Earnings per share—basic	$	0.52	$	0.49	$	0.94	$	0.97
Earnings per share—diluted	$	0.52	$	0.49	$	0.94	$	0.97
Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019	517,012		517,012		517,012		517,012
Stock options considered anti-dilutive excluded from potentially dilutive shares	155,500		428,493		155,500		428,676
Restricted stock considered anti-dilutive excluded from potentially dilutive shares	122,851		42,079		95,204		39,005

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENT

We use fair value measurements when recording and disclosing certain financial assets and liabilities. Securities available-for-sale, trading assets and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans, other real estate owned, or OREO, mortgage servicing rights, or MSRs, and certain other assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which is developed, based on market data we have obtained from independent sources. Unobservable inputs reflect our estimate of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.

The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:

Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.

Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.

Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred.

The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis.

Recurring Basis

Securities Available-for-Sale

Securities available-for-sale include both debt and marketable equity securities. We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market valuation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models and vast descriptive terms and conditions databases, as well as extensive quality control programs.

Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3.

Trading Assets

We use quoted market prices to determine the fair value of our trading assets. Our trading assets are held in a Rabbi Trust under a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENTS – continued

Derivative Financial Instruments

We use derivative instruments including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties' nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting any applicable credit enhancements and collateral postings.

Nonrecurring Basis

Loans Held for Sale

Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3.

Impaired Loans

Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish a specific reserve based on the following three impairment methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate, 2) the loan’s observable market price or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Impaired loans carried at fair value are classified as Level 3.

OREO and Other Repossessed Assets

OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Like impaired loans, appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3.

Mortgage Servicing Rights

The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3.

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENTS – continued

Financial Instruments

In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments.

Cash and Cash Equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value.

Loans

The fair value of variable rate performing loans that may reprice frequently at short-term market rates is based on carrying values adjusted for credit risk. The fair value of variable rate performing loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of fixed rate performing loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of impaired nonperforming loans is based on their carrying values less any specific reserve. The carrying amount of accrued interest approximates fair value.

Bank Owned Life Insurance

Fair value approximates net cash surrender value of bank owned life insurance.

Federal Home Loan Bank, or FHLB, and Other Restricted Stock

It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; therefore, it is presented at carrying value.

Deposits

The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value.

Short-Term Borrowings

The carrying amounts of securities sold under repurchase agreements and other short-term borrowings approximate their fair values.

Long-Term Borrowings

The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values.

Junior Subordinated Debt Securities

The variable rate junior subordinated debt securities reprice quarterly; therefore, the fair values approximate the carrying values.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENTS – continued

Loan Commitments and Standby Letters of Credit

Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

Other

Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at June 30, 2015 and December 31, 2014. Due to limited trading volume, we transferred marketable equity securities with a fair value of $0.2 million from Level 1 to Level 2 during the six month period ended June 30, 2015. There were no other transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.

	June 30, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Securities available-for-sale:
U.S. Treasury securities	$	—	$	15,018	$	—	$	15,018
Obligations of U.S. government corporations and agencies	—		270,112		—		270,112
Collateralized mortgage obligations of U.S. government corporations and agencies	—		139,577		—		139,577
Residential mortgage-backed securities of U.S. government corporations and agencies	—		43,419		—		43,419
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		49,676		—		49,676
Obligations of states and political subdivisions	—		139,947		—		139,947
Marketable equity securities	—		8,875		—		8,875
Total securities available-for-sale	—		666,624		—		666,624
Trading securities held in a Rabbi Trust	3,796		—		—		3,796
Total securities	3,796		666,624		—		670,420
Derivative financial assets:
Interest rate swaps	—		11,013		—		11,013
Interest rate lock commitments	—		366		—		366
Forward sale contracts	—		17		—		17
Total Assets	$	3,796	$	678,020	$	—	$	681,816
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	10,994	$	—	$	10,994
Total Liabilities	$	—	$	10,994	$	—	$	10,994

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENTS – continued

	December 31, 2014
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Securities available-for-sale:
U.S. Treasury securities	$	—	$	14,880	$	—	$	14,880
Obligations of U.S. government corporations and agencies	—		269,285		—		269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	—		118,006		—		118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	—		46,668		—		46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,673		—		39,673
Obligations of states and political subdivisions	—		142,702		—		142,702
Marketable equity securities	178		8,881		—		9,059
Total securities available-for-sale	178		640,095		—		640,273
Trading securities held in a Rabbi Trust	3,456		—		—		3,456
Total securities	3,634		640,095		—		643,729
Derivative financial assets:
Interest rate swaps	—		12,981		—		12,981
Interest rate lock commitments	—		235		—		235
Forward sale contracts	—		—		—		—
Total Assets	$	3,634	$	653,311	$	—	$	656,945
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	12,953	$	—	$	12,953
Forward sale contracts	—		57		—		57
Total Liabilities	$	—	$	13,010	$	—	$	13,010

We classify financial instruments as Level 3 when valuation models are used because significant inputs are not observable in the market. We had no assets or liabilities measured at fair value on a recurring basis for which we have utilized Level 3 inputs to determine the fair value at either June 30, 2015 or December 31, 2014.

We may be required to measure certain assets and liabilities on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. The following table presents our assets that were measured at fair value on a nonrecurring basis by the fair value hierarchy level at June 30, 2015 and December 31, 2014. There were no liabilities measured at fair value on a nonrecurring basis during these periods.

	June 30, 2015								December 31, 2014
(dollars in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS(1)
Loans held for sale	$	—	$	—	$	2,900	$	2,900	$	—	$	—	$	—	$	—
Impaired loans	—		—		13,913		13,913		—		—		12,916		12,916
Other real estate owned	—		—		747		747		—		—		117		117
Mortgage servicing rights	—		—		721		721		—		—		1,176		1,176
Total Assets	$	—	$	—	$	18,281	$	18,281	$	—	$	—	$	14,209	$	14,209
(1)This table presents only the nonrecurring items that are recorded at fair value in our financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENTS – continued

The carrying values and fair values of our financial instruments at June 30, 2015 and December 31, 2014 are presented in the following tables:

	Carrying Value(1)		Fair Value Measurements at June 30, 2015
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	146,582	$	146,582	$	146,582	$	—	$	—
Securities available-for-sale	666,624		666,624		—		666,624		—
Loans held for sale	13,634		13,722		—		—		13,722
Portfolio loans, net of unearned income	4,798,498		4,774,871		—		—		4,774,871
Bank owned life insurance	79,314		79,314		—		79,314		—
FHLB and other restricted stock	23,553		23,553		—		—		23,553
Trading securities held in a Rabbi Trust	3,796		3,796		3,796		—		—
Mortgage servicing rights	2,974		3,137		—		—		3,137
Interest rate swaps	11,013		11,013		—		11,013		—
Interest rate lock commitments	366		366		—		366		—
Forward sale contracts	17		17		—		17		—
LIABILITIES
Deposits	$	4,859,415	$	4,865,521	$	—	$	—	$	4,865,521
Securities sold under repurchase agreements	46,235		46,235		—		—		46,235
Short-term borrowings	230,975		230,975		—		—		230,975
Long-term borrowings	118,228		119,148		—		—		119,148
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	10,994		10,994		—		10,994		—
(1) As reported in the Consolidated Balance Sheets

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 4. FAIR VALUE MEASUREMENTS – continued

	Carrying Value(1)		Fair Value Measurements at December 31, 2014
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	109,580	$	109,580	$	109,580	$	—	$	—
Securities available-for-sale	640,273		640,273		178		640,095		—
Loans held for sale	2,970		2,991		—		—		2,991
Portfolio loans, net of unearned income	3,868,746		3,827,634		—		—		3,827,634
Bank owned life insurance	62,252		62,252		—		62,252		—
FHLB and other restricted stock	15,135		15,135		—		—		15,135
Trading securities held in a Rabbi Trust	3,456		3,456		3,456		—		—
Mortgage servicing rights	2,817		2,934		—		—		2,934
Interest rate swaps	12,981		12,981		—		12,981		—
Interest rate lock commitments	235		235		—		235		—
LIABILITIES
Deposits	$	3,908,842	$	3,910,342	$	—	$	—	$	3,910,342
Securities sold under repurchase agreements	30,605		30,605		—		—		30,605
Short-term borrowings	290,000		290,000		—		—		290,000
Long-term borrowings	19,442		20,462		—		—		20,462
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	12,953		12,953		—		12,953		—
Forward sale contracts	57		57		—		57		—
(1) As reported in the Consolidated Balance Sheets

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 5. SECURITIES AVAILABLE-FOR-SALE

The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:

	June 30, 2015									December 31, 2014
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,893	$	125	$	—		$	15,018	$	14,873	$	7	$	—		$	14,880
Obligations of U.S. government corporations and agencies	267,604		2,935		(427		)	270,112		268,029		2,334		(1,078		)	269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	138,160		1,549		(132		)	139,577		116,897		1,257		(148		)	118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	42,155		1,450		(186		)	43,419		45,274		1,548		(154		)	46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,737		312		(373		)	49,676		39,834		232		(393		)	39,673
Obligations of states and political subdivisions	136,540		3,927		(520		)	139,947		136,977		5,789		(64		)	142,702
Debt Securities	649,089		10,298		(1,638		)	657,749		621,884		11,167		(1,837		)	631,214
Marketable equity securities	7,579		1,296		—			8,875		7,579		1,480		—			9,059
Total	$	656,668	$	11,594	$	(1,638	)	$	666,624	$	629,463	$	12,647	$	(1,837	)	$	640,273

Realized gains and losses on the sale of securities are determined using the specific-identification method. The following table shows the composition of gross and net realized gains and losses for the periods presented:

	Three Months Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2015			2014		2015			2014
Gross realized gains	$	—		$	40	$	—		$	41
Gross realized losses	34			—		34			—
Net Realized Gains	$	(34	)	$	40	$	(34	)	$	41

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 5. SECURITIES AVAILABLE-FOR-SALE – continued

The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented:

	June 30, 2015
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	33,489	$	(215	)	4	$	30,033	$	(212	)	8	$	63,522	$	(427	)
Collateralized mortgage obligations of U.S. government corporations and agencies	2	17,288		(132		)	—	—		—			2	17,288		(132		)
Residential mortgage-backed securities of U.S. government corporations and agencies	2	10,704		(186		)	—	—		—			2	10,704		(186		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	2	20,976		(180		)	1	9,610		(193		)	3	30,586		(373		)
Obligations of states and political subdivisions	10	42,967		(520		)	—	—		—			10	42,967		(520		)
Total Temporarily Impaired Securities	20	$	125,424	$	(1,233	)	5	$	39,643	$	(405	)	25	$	165,067	$	(1,638	)

	December 31, 2014
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	39,745	$	(207	)	8	$	63,149	$	(871	)	12	$	102,894	$	(1,078	)
Collateralized mortgage obligations of U.S. government corporations and agencies	1	9,323		(148		)	—	—		—			1	9,323		(148		)
Residential mortgage-backed securities of U.S. government corporations and agencies	—	—		—			1	8,982		(154		)	1	8,982		(154		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	1	9,998		(25		)	2	20,640		(368		)	3	30,638		(393		)
Obligations of states and political subdivisions	1	263		(1		)	2	10,756		(63		)	3	11,019		(64		)
Total Temporarily Impaired Securities	7	$	59,329	$	(381	)	13	$	103,527	$	(1,456	)	20	$	162,856	$	(1,837	)

We do not believe any individual unrealized loss as of June 30, 2015 represents an other than temporary impairment. As of June 30, 2015, the unrealized losses on 25 debt securities were attributable to changes in interest rates and not related to the credit quality of these securities. All debt securities are determined to be investment grade and are paying principal and interest according to the contractual terms of the security. There were no unrealized losses on marketable equity securities as of June 30, 2015. We do not intend to sell and it is not more likely than not that we will be required to sell any of the securities, referenced in the table above, in an unrealized loss position before recovery of their amortized cost.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 5. SECURITIES AVAILABLE-FOR-SALE – continued

The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive (loss)/income for the periods presented:

	June 30, 2015							December 31, 2014
(dollars in thousands)	Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains/ (Losses)		Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
Total unrealized gains/(losses) on securities available-for-sale	$	11,594	$	(1,638	)	$	9,956	$	12,647	$	(1,837	)	$	10,810
Income tax expense/(benefit)	4,058		(573		)	3,485		4,426		(643		)	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss)	$	7,536	$	(1,065	)	$	6,471	$	8,221	$	(1,194	)	$	7,027

The amortized cost and fair value of securities available-for-sale at June 30, 2015 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	June 30, 2015
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	29,892	$	30,223
Due after one year through five years	215,038		217,163
Due after five years through ten years	80,796		82,406
Due after ten years	93,311		95,285
	419,037		425,077
Collateralized mortgage obligations of U.S. government corporations and agencies	138,160		139,577
Residential mortgage-backed securities of U.S. government corporations and agencies	42,155		43,419
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,737		49,676
Debt Securities	649,089		657,749
Marketable equity securities	7,579		8,875
Total	$	656,668	$	666,624

At June 30, 2015 and December 31, 2014, securities with carrying values of $326.3 million and $289.1 million were pledged for various regulatory and legal requirements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. LOANS AND LOANS HELD FOR SALE

 Loans are presented net of unearned income of $14.0 million and $2.1 million at June 30, 2015 and December 31, 2014. Included in the $14.0 million is a $14.7 million net discount related to purchase accounting fair value adjustments. The following table indicates the composition of the loans as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Commercial
Commercial real estate	$	2,054,935	$	1,682,236
Commercial and industrial	1,239,382		994,138
Commercial construction	344,983		216,148
Total Commercial Loans	3,639,300		2,892,522
Consumer
Residential mortgage	599,502		489,586
Home equity	457,813		418,563
Installment and other consumer	94,437		65,567
Consumer construction	7,446		2,508
Total Consumer Loans	1,159,198		976,224
Total Portfolio Loans	4,798,498		3,868,746
Loans held for sale	13,634		2,970
Total Loans	$	4,812,132	$	3,871,716

We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, collateral and industry and actively managing concentrations.When concentrations exist in certain segments, we mitigate this risk by monitoring the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments.Total commercial loans represented 76 percent of total portfolio loans at June 30, 2015 and 75 percent of total portfolio loans at December 31, 2014. Within our commercial portfolio, the CRE and commercial construction portfolios combined comprised $2.4 billion or 66 percent of total commercial loans and 50 percent of total portfolio loans at June 30, 2015 and 66 percent of total commercial loans and 49 percent of total portfolio loans at December 31, 2014. Of the $2.4 billion of CRE and commercial construction loans, $424.0 million were added as a result of the Merger. Further segmentation of the CRE and commercial construction portfolios by industry and collateral type reveal no concentration in excess of 7.0 percent of total loans at June 30, 2015 and December 31, 2014.

Our market area includes Pennsylvania and the contiguous states of Ohio, West Virginia, New York and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this market area resulting in a geographic concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. The conditions of the local and regional economies are monitored closely through publicly available data as well as information supplied by our customers. Management believes underwriting guidelines, active monitoring of economic conditions and ongoing review by credit administration mitigates the concentration risk present in the loan portfolio. Our CRE and commercial construction portfolios had out of market exposure of 6.3 percent of the combined portfolio and 3.1 percent of total loans at June 30, 2015 and 8.0 percent of the combined portfolio and 3.9 percent of total loans at December 31, 2014.

Troubled debt restructurings, or TDRs, are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower that we would not otherwise grant. We strive to identify borrowers in financial difficulty early and work with them to modify the terms before their loan reaches nonaccrual status. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual, there may be instances of principal forgiveness. These modifications are generally for longer term periods that would not be considered insignificant. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed as TDRs.

We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, as well as all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan to determine if they should be designated as TDRs. All TDRs are considered to be impaired loans and will be reported as impaired loans for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. Further, all

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. LOANS AND LOANS HELD FOR SALE - continued

impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements to be returned to accruing status. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.

The following table summarizes the restructured loans as of the dates presented:

	June 30, 2015						December 31, 2014
(dollars in thousands)	Performing TDRs		Nonperforming TDRs		Total TDRs		Performing TDRs		Nonperforming TDRs		Total TDRs
Commercial real estate	$	13,045	$	3,553	$	16,598	$	16,939	$	2,180	$	19,119
Commercial and industrial	7,899		2,226		10,125		8,074		356		8,430
Commercial construction	5,655		1,969		7,624		5,736		1,869		7,605
Residential mortgage	2,622		609		3,231		2,839		459		3,298
Home equity	3,302		411		3,713		3,342		562		3,904
Installment and other consumer	36		160		196		53		10		63
Total	$	32,559	$	8,928	$	41,487	$	36,983	$	5,436	$	42,419

There were six TDRs that returned to accruing status totaling $0.3 million during the three and six months ended June 30, 2015 and there were no TDRs that returned to accruing status for the three and six months ended June 30, 2014.

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. LOANS AND LOANS HELD FOR SALE - continued

The following tables present the restructured loans during the periods presented:

	Three Months Ended June 30, 2015							Three Months Ended June 30, 2014
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment		Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Commercial real estate
Principal deferral	—	$	—	$	—	$	—	1	$	129	$	127	$	(2	)
Commercial and industrial
Principal forgiveness	1	400		400		—		—	—		—		—
Residential mortgage
Chapter 7 bankruptcy(2)	—	—		—		—		1	52		52		—
Maturity date extension and interest rate reduction	2	225		225		—		—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	4	171		171		—		4	43		41		(2		)
Installment and other consumer
Chapter 7 bankruptcy(2)	—	—		—		$	—	1	9		9		$	—
Total by Concession Type
Principal forgiveness	1	$	400	$	400	$	—	—	$	—	$	—	$	—
Principal deferral	—	—		—		—		1	129		127		(2		)
Maturity date extension and interest rate reduction	2	225		225		—		—	—		—		—
Chapter 7 bankruptcy(2)	4	171		171		—		6	104		102		(2		)
Total	7	$	796	$	796	$	—	7	$	233	$	229	$	(4	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. LOANS AND LOANS HELD FOR SALE - continued

	Six Months Ended June 30, 2015								Six Months Ended June 30, 2014
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment			Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Commercial real estate
Principal deferral	2	$	2,851	$	2,851	$	—		1	$	129	$	127	$	(2	)
Commercial and industrial
Principal forgiveness	1	400		400		—			—	—		—		—
Principal deferral	6	661		661		—			—	—		—		—
Chapter 7 bankruptcy(2)	1	3		1		(2		)	1	287		286		(1		)
Maturity date extension	1	780		765		(15		)	—	—		—		—
Commercial Construction
Principal deferral	1	104		103		(1		)	—	—		—		—
Maturity date extension	—	—		—		—			1	1,019		1,019		—
Residential mortgage
Chapter 7 bankruptcy(2)	—	—		—		—			5	329		327		(2		)
Maturity date extension and interest rate reduction	2	225		225		—			—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	12	313		304		(9		)	10	269		251		(18		)
Maturity date extension	1	71		71		—			—	—		—		—
Installment and other consumer
Chapter 7 bankruptcy(2)	—	—		—		$	—		1	9		9		$	—
Total by Concession Type
Principal forgiveness	1	$	400	$	400	$	—		—	$	—	$	—	$	—
Principal deferral	9	3,616		3,615		(1		)	1	129		127		(2		)
Chapter 7 bankruptcy(2)	13	316		305		(11		)	17	894		873		(21		)
Maturity date extension and interest rate reduction	2	225		225		—			—	—		—		—
Maturity date extension	2	851		836		(15		)	1	1,019		1,019		—
Total	27	5,408		5,381		$	(27	)	19	$	2,042	$	2,019	$	(23	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

For the three months ended June 30, 2015, we modified four C&I loans totaling $5.5 million, four commercial construction loans totaling $1.3 million, one CRE loan totaling $0.8 million and two home equity loans totaling $0.2 million that were not considered to be TDRs. For the six months ended June 30, 2015 we modified six C&I loans totaling $5.7 million, four commercial construction loans totaling $1.3 million, three CRE loans totaling $1.0 million and two home equity loans totaling $0.2 million that were not considered to be TDRs. The modifications represented instances where there were insignificant delays in payment of three months or less or we concluded that no concession was granted. As of June 30, 2015 we have no commitments to lend additional funds on any TDRs.

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 6. LOANS AND LOANS HELD FOR SALE - continued

Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. The following tables present a summary of TDRs which defaulted during the periods presented that had been restructured within the last 12 months prior to defaulting:

	Defaulted TDRs
	Three Months Ended			Three Months Ended
	June 30, 2015			June 30, 2014
(dollars in thousands)	Number of Defaults	Recorded Investment		Number of Defaults	Recorded Investment
Home equity	2	$	119	—	$	—
Total	2	$	119	—	$	—

	Defaulted TDRs
	Six Months Ended			Six Months Ended
	June 30, 2015			June 30, 2014
(dollars in thousands)	Number of Defaults	Recorded Investment		Number of Defaults	Recorded Investment
Residential mortgage	1	$	183	1	$	72
Home equity	3	124		—	—
Total	4	$	307	1	$	72

The following table is a summary of nonperforming assets as of the dates presented:

	Nonperforming Assets
(dollars in thousands)	June 30, 2015		December 31, 2014
Nonperforming Assets
Nonaccrual loans	$	10,211	$	7,021
Nonaccrual TDRs	8,928		5,436
Total nonaccrual loans	19,139		12,457
OREO	750		166
Total Nonperforming Assets	$	19,889	$	12,623

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES

We maintain an allowance for loan losses, or ALL, at a level determined to be adequate to absorb estimated probable credit losses inherent in the loan portfolio as of the balance sheet date. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer.

The following are key risks within each portfolio segment:

CRE—Loans secured by commercial purpose real estate, including both owner occupied properties and investment properties, for various purposes such as hotels, strip malls and apartments. Operations of the individual projects as well as global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type as well as the business prospects of the lessee, if the project is not owner occupied.

C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be complete, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

Consumer Real Estate—Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residences, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

We further assess risk within each portfolio segment by pooling loans with similar risk characteristics. For the commercial loan classes, the most important indicator of risk is the internally assigned risk rating, including pass, special mention and substandard. Consumer loans are pooled by type of collateral, lien position and loan to value, or LTV, ratio for Consumer Real Estate loans. Historical loss rates are applied to these loan pools to determine the reserve for loans collectively evaluated for impairment.

The ALL methodology for groups of loans collectively evaluated for impairment is comprised of both a quantitative and qualitative analysis. A key assumption in the quantitative component of the reserve is the loss emergence period, or LEP. The LEP is an estimate of the average amount of time from the point at which a loss is incurred on a loan to the point at which the loss is confirmed. In general, the LEP will be shorter in an economic slowdown or recession and longer during times of economic stability or growth, as customers are better able to delay loss confirmation after a potential loss event has occurred. 

Another key assumption is the look-back period, or LBP, which represents the historical data period utilized to calculate loss rates.

Management monitors various credit quality indicators for both the commercial and consumer loan portfolios, including delinquency, nonperforming status and changes in risk ratings on a monthly basis.

28

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

The following tables present the age analysis of past due loans segregated by class of loans as of June 30, 2015 and December 31, 2014:

	June 30, 2015
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days Past Due(1)		Nonaccrual		Total Past Due		Total Loans
Commercial real estate	$	2,032,731	$	9,656	$	3,518	$	1,721	$	7,309	$	22,204	$	2,054,935
Commercial and industrial	1,231,221		2,875		2,143		—		3,143		8,161		1,239,382
Commercial construction	333,897		4,474		—		2,140		4,472		11,086		344,983
Residential mortgage	593,043		1,732		1,770		947		2,010		6,459		599,502
Home equity	453,279		1,971		430		107		2,026		4,534		457,813
Installment and other consumer	93,223		261		774		—		179		1,214		94,437
Consumer construction	7,446		—		—		—		—		—		7,446
Loans held for sale	13,634		—		—		—		—		—		13,634
Totals	$	4,758,474	$	20,969	$	8,635	$	4,915	$	19,139	$	53,658	$	4,812,132
(1)Represents acquired loans that were recorded at fair value at the acquisition date.

	December 31, 2014
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days Past Due		Nonaccrual		Total Past Due		Total Loans
Commercial real estate	$	1,674,930	$	2,548	$	323	$	—	$	4,435	$	7,306	$	1,682,236
Commercial and industrial	991,136		1,227		153		—		1,622		3,002		994,138
Commercial construction	214,174		—		—		—		1,974		1,974		216,148
Residential mortgage	485,465		565		1,220		—		2,336		4,121		489,586
Home equity	414,303		1,756		445		—		2,059		4,260		418,563
Installment and other consumer	65,111		352		73		—		31		456		65,567
Consumer construction	2,508		—		—		—		—		—		2,508
Loans held for sale	2,970		—		—		—		—		—		2,970
Totals	$	3,850,597	$	6,448	$	2,214	$	—	$	12,457	$	21,119	$	3,871,716

We continually monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.

Our risk ratings are consistent with regulatory guidance and are as follows:

Pass—The loan is currently performing and is of high quality.

Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Economic and market conditions, beyond the borrower’s control, may in the future necessitate this classification.

Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	June 30, 2015
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	1,976,311	96.2	%	$	1,158,898	93.5	%	$	300,968	87.3	%	$	3,436,177	94.4	%
Special mention	33,328		1.6	%	60,251		4.9	%	26,276		7.6	%	119,855		3.3	%
Substandard	45,296		2.2	%	20,233		1.6	%	17,739		5.1	%	83,268		2.3	%
Total	$	2,054,935	100	%	$	1,239,382	100.0	%	$	344,983	100.0	%	$	3,639,300	100.0	%
	December 31, 2014
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	1,635,132	97.2	%	$	948,663	95.4	%	$	196,520	90.9	%	$	2,780,315	96.1	%
Special mention	23,597		1.4	%	30,357		3.1	%	12,014		5.6	%	65,968		2.3	%
Substandard	23,507		1.4	%	15,118		1.5	%	7,614		3.5	%	46,239		1.6	%
Total	$	1,682,236	100.0	%	$	994,138	100.0	%	$	216,148	100.0	%	$	2,892,522	100.0	%

We monitor the delinquent status of the consumer portfolio on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans.

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	June 30, 2015
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	597,492	99.7	%	$	455,787	99.6	%	$	94,258	99.8	%	$	7,446	100.0	%	$	1,154,983	99.6	%
Nonperforming	2,010		0.3	%	2,026		0.4	%	179		0.2	%	—		—	%	4,215		0.4	%
Total	$	599,502	100.0	%	$	457,813	100.0	%	$	94,437	100.0	%	$	7,446	100.0	%	$	1,159,198	100.0	%
	December 31, 2014
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	487,250	99.5	%	$	416,504	99.5	%	$	65,536	99.9	%	$	2,508	100.0	%	$	971,798	99.5	%
Nonperforming	2,336		0.5	%	2,059		0.5	%	31		0.1	%	—		—	%	4,426		0.5	%
Total	$	489,586	100.0	%	$	418,563	100.0	%	$	65,567	100.0	%	$	2,508	100.0	%	$	976,224	100.0	%

We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. Loans are considered to be impaired when based upon current information and events it is probable that we will be unable to collect all principal and interest payments due according to the original contractual terms of the loan agreement. All TDRs will be reported as an impaired loan for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is expected that the remaining principal and interest will be fully collected according to the restructured agreement. For all TDRs, regardless of size, as well as all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate.

30

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

The following tables summarize investments in loans considered to be impaired and the related information on those impaired loans as of the dates presented:

	June 30, 2015						December 31, 2014
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
Without a related allowance recorded:
Commercial real estate	$	18,548	$	25,698	$	—	$	19,890	$	25,262	$	—
Commercial and industrial	10,125		11,877		—		9,218		9,449		—
Commercial construction	9,293		12,983		—		7,605		11,293		—
Consumer real estate	6,824		7,527		—		7,159		7,733		—
Other consumer	192		197		—		42		48		—
Total without a Related Allowance Recorded	44,982		58,282		—		43,914		53,785		—
With a related allowance recorded:
Commercial real estate	749		749		567		—		—		—
Commercial and industrial	—		—		—		—		—		—
Commercial construction	—		—		—		—		—		—
Consumer real estate	120		120		37		43		43		43
Other consumer	4		4		4		20		20		11
Total with a Related Allowance Recorded	873		873		608		63		63		54
Total:
Commercial real estate	19,297		26,447		567		19,890		25,262		—
Commercial and industrial	10,125		11,877		—		9,218		9,449		—
Commercial construction	9,293		12,983		—		7,605		11,293		—
Consumer real estate	6,944		7,647		37		7,202		7,776		43
Other consumer	196		201		4		62		68		11
Total	$	45,855	$	59,155	$	608	$	43,977	$	53,848	$	54

31

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:

	Three Months Ended
	June 30, 2015				June 30, 2014
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	$	19,733	$	158	$	21,382	$	159
Commercial and industrial	10,782		84		9,317		57
Commercial construction	8,119		81		8,279		57
Consumer real estate	6,891		91		7,166		100
Other consumer	126		4		109		1
Total without a Related Allowance Recorded	45,651		418		46,253		374
With a related allowance recorded:
Commercial real estate	420		—		—		—
Commercial and industrial	—		—		—		—
Commercial construction	—		—		—		—
Consumer real estate	121		2		48		1
Other consumer	4		—		22		—
Total with a Related Allowance Recorded	545		2		70		1
Total:
Commercial real estate	20,153		158		21,382		159
Commercial and industrial	10,782		84		9,317		57
Commercial construction	8,119		81		8,279		57
Consumer real estate	7,012		93		7,214		101
Other consumer	130		4		131		1
Total	$	46,196	$	420	$	46,323	$	375

32

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

	Six Months Ended
	June 30, 2015				June 30, 2014
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	$	20,455	$	322	$	21,980	$	329
Commercial and industrial	11,162		146		9,066		114
Commercial construction	6,628		134		8,301		114
Consumer real estate	6,943		186		7,260		203
Other consumer	86		4		112		2
Total without a Related Allowance Recorded	45,274		792		46,719		762
With a related allowance recorded:
Commercial real estate	$	211	$	—	$	—	$	—
Commercial and industrial	—		—		—		—
Commercial construction	—		—		—		—
Consumer real estate	122		3		50		2
Other consumer	4		—		23		1
Total with a Related Allowance Recorded	337		3		73		3
Total:
Commercial real estate	20,666		322		21,980		329
Commercial and industrial	11,162		146		9,066		114
Commercial construction	6,628		134		8,301		114
Consumer real estate	7,065		189		7,310		205
Other consumer	90		4		135		3
Total	$	45,611	$	795	$	46,792	$	765

33

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

The following tables detail activity in the ALL for the periods presented:

	Three Months Ended June 30, 2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,071		$	13,711		$	6,869		$	6,723		$	1,732		$	48,106
Charge-offs	(310		)	(992		)	—			(177		)	(276		)	(1,755		)
Recoveries	73			89			1			112			129			404
Net (Charge-offs)/ Recoveries	(237		)	(903		)	1			(65		)	(147		)	(1,351		)
Provision for loan losses	184			500			801			369			205			2,059
Balance at End of Period	$	19,018		$	13,308		$	7,671		$	7,027		$	1,790		$	48,814
	Three Months Ended June 30, 2014
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,880		$	13,979		$	5,183		$	6,408		$	1,166		$	46,616
Charge-offs	(1,737		)	(743		)	(664		)	(425		)	(177		)	(3,746		)
Recoveries	1,294			2,936			324			164			126			4,844
Net (Charge-offs)/ Recoveries	(443		)	2,193			(340		)	(261		)	(51		)	1,098
Provision for loan losses	1,296			(3,168		)	(84		)	558			264			(1,134		)
Balance at End of Period	$	20,733		$	13,004		$	4,759		$	6,705		$	1,379		$	46,580
	Six Months Ended June 30, 2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	20,164		$	13,668		$	6,093		$	6,333		$	1,653		$	47,911
Charge-offs	(376		)	(1,698		)	—			(552		)	(579		)	(3,205		)
Recoveries	176			203			2			248			213			842
Net (Charge-offs)/Recoveries	(200		)	(1,495		)	2			(304		)	(366		)	(2,363		)
Provision for loan losses	(946		)	1,135			1,576			998			503			3,266
Balance at End of Period	$	19,018		$	13,308		$	7,671		$	7,027		$	1,790		$	48,814
	Six Months Ended June 30, 2014
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	18,921		$	14,433		$	5,374		$	6,362		$	1,165		$	46,255
Charge-offs	(2,004		)	(1,033		)	(692		)	(547		)	(445		)	(4,721		)
Recoveries	1,834			3,249			375			223			210			5,891
Net (Charge-offs)/Recoveries	(170		)	2,216			(317		)	(324		)	(235		)	1,170
Provision for loan losses	1,982			(3,645		)	(298		)	667			449			(845		)
Balance at End of Period	$	20,733		$	13,004		$	4,759		$	6,705		$	1,379		$	46,580

34

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 7. ALLOWANCE FOR LOAN LOSSES – continued

The following tables present the ALL and recorded investments in loans by category as of the periods presented:

	June 30, 2015
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total(1)
Commercial real estate	$	567	$	18,451	$	19,018	$	19,297	$	2,035,638	$	2,054,935
Commercial and industrial	—		13,308		13,308		10,125		1,229,257		1,239,382
Commercial construction	—		7,671		7,671		9,293		335,690		344,983
Consumer real estate	37		6,990		7,027		6,944		1,057,817		1,064,761
Other consumer	4		1,786		1,790		196		94,241		94,437
Total	$	608	$	48,206	$	48,814	$	45,855	$	4,752,643	$	4,798,498
(1)Includes acquired loans.
	December 31, 2014
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total(1)
Commercial real estate	$	—	$	20,164	$	20,164	$	19,890	$	1,662,346	$	1,682,236
Commercial and industrial	—		13,668		13,668		9,218		984,920		994,138
Commercial construction	—		6,093		6,093		7,605		208,543		216,148
Consumer real estate	43		6,290		6,333		7,202		903,455		910,657
Other consumer	11		1,642		1,653		62		65,505		65,567
Total	$	54	$	47,857	$	47,911	$	43,977	$	3,824,769	$	3,868,746
(1)Includes acquired loans.

Acquired loans are recorded at fair value with no carryover of the ALL. Credit deterioration on acquired loans incurred subsequent to the acquisition date will be recognized in the ALL through the provision.

35

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 8. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Interest Rate Swaps

In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates.

Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial.

Derivatives contain an element of credit risk, including the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive Income.

Interest Rate Lock Commitments and Forward Sale Contracts

In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the interest rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive Income.

36

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 8. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES – continued

The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:

	Derivatives (included in Other Assets)				Derivatives (included in Other Liabilities)
(dollars in thousands)	June 30, 2015		December 31, 2014		June 30, 2015		December 31, 2014
Derivatives not Designated as Hedging Instruments:
Interest Rate Swap Contracts- Commercial Loans
Fair value	$	11,013	$	12,981	$	10,994	$	12,953
Notional amount	233,777		245,152		233,777		245,152
Collateral posted	—		—		12,489		12,059
Interest Rate Lock Commitments- Mortgage Loans
Fair value	366		235		—		—
Notional amount	14,034		8,822		—		—
Forward Sale Contracts- Mortgage Loans
Fair value	17		—		—		57
Notional amount	$	13,812	$	—	$	—	$	7,789

Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset as well as a derivative liability with the same counterparty to a swap transaction and are permitted to offset the asset position and the liability position resulting in a net presentation.

The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	June 30, 2015			December 31, 2014			June 30, 2015			December 31, 2014
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	11,030		$	13,203		$	11,011		$	13,175
Gross amounts offset	(17		)	(222		)	(17		)	(222		)
Net amounts presented in the Consolidated Balance Sheets	11,013			12,981			10,994			12,953
Gross amounts not offset(1)	—			—			(12,489		)	(12,059		)
Net Amount	$	11,013		$	12,981		$	(1,495	)	$	894

⁽¹⁾ Amounts represent posted collateral.

The following table indicates the gain or loss recognized in income on derivatives for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Derivatives not Designated as Hedging Instruments
Interest rate swap contracts—commercial loans	$	(21	)	$	(11	)	$	(8	)	$	(19	)
Interest rate lock commitments—mortgage loans	(8		)	199			128			207
Forward sale contracts—mortgage loans	92			(64		)	74			(93		)
Total Derivatives Gain (Loss)	$	63		$	124		$	194		$	95

37

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 9. BORROWINGS

Short-term borrowings are for terms under one year and were comprised of retail repurchase agreements, or REPOs, and FHLB advances. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation, or FDIC. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and are therefore accounted for as a secured borrowing. Mortgage backed securities with a total carrying value of $50.5 million at June 30, 2015 and $35.6 million at December 31, 2014 were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily.

Long-term borrowings are for original terms greater than one year and were comprised of FHLB advances, a capital lease and junior subordinated debt securities. Long-term FHLB advances are secured by the same loans as short-term borrowings. We had total long-term borrowings outstanding of $15.0 million at a fixed rate and $148.8 million at a variable rate at June 30, 2015, excluding our capital lease of $0.2 million. On March 5, 2015, we paid off $8.5 million and on June 18, 2015, we paid off the remaining $5.0 million of the $13.5 million junior subordinated debt assumed in the Merger.

Information pertaining to borrowings is summarized in the table below as of the dates presented:

	June 30, 2015				December 31, 2014
(dollars in thousands)	Balance		Weighted Average Rate		Balance		Weighted Average Rate
Short-term borrowings
Securities sold under repurchase agreements	$	46,235	0.01	%	$	30,605	0.01	%
Short-term borrowings	230,975		0.33	%	290,000		0.31	%
Total short-term borrowings	277,210		0.28	%	320,605		0.27	%
Long-term borrowings
Other long-term borrowings	118,228		0.76	%	19,442		3.00	%
Junior subordinated debt securities	45,619		2.74	%	45,619		2.70	%
Total long-term borrowings	163,847		1.31	%	65,061		2.79	%
Total Borrowings	$	441,057	0.66	%	$	385,666	0.70	%

We had total borrowings at June 30, 2015 and December 31, 2014 at the FHLB of Pittsburgh of $349.0 million and $309.3 million. The $349.0 million at June 30, 2015 consisted of $231.0 million in short-term borrowings and $118.0 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $1.9 billion at June 30, 2015. Our remaining borrowing availability is $1.4 billion. We utilized $0.5 billion of our borrowing capacity at June 30, 2015 consisting of $349.0 million for borrowings and $168.5 million for letters of credit to collateralize public funds.

38

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 10. COMMITMENTS AND CONTINGENCIES

Commitments

In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event a customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Our allowance for unfunded commitments totaled $2.9 million at June 30, 2015 and $2.3 million at December 31, 2014. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The allowance for unfunded commitments is determined using a similar methodology as our ALL. The reserve is calculated by applying historical loss rates and qualitative adjustments to our unfunded commitments.

Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

The following table sets forth the commitments and letters of credit as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Commitments to extend credit	$	1,453,491	$	1,158,628
Standby letters of credit	98,838		73,584
Total	$	1,552,329	$	1,232,212

Litigation

In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

39

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 11. OTHER COMPREHENSIVE INCOME

The following table presents the tax effects of the components of other comprehensive income (loss) for the periods presented:

	Three Months Ended June 30, 2015									Three Months Ended June 30, 2014
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in unrealized (losses)/gains on securities available-for-sale	$	(5,872	)	$	2,056		$	(3,816	)	$	5,401		$	(1,891	)	$	3,510
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	34			(12		)	22			(40		)	15			(25		)
Adjustment to funded status of employee benefit plans	463			(162		)	301			211			(74		)	137
Other Comprehensive (Loss)/Income	$	(5,375	)	$	1,882		$	(3,493	)	$	5,572		$	(1,950	)	$	3,622
(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
	Six Months Ended June 30, 2015									Six Months Ended June 30, 2014
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in unrealized (losses)/ gains on securities available-for-sale	$	(889	)	$	311		$	(578	)	$	9,876		$	(3,457	)	$	6,419
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	34			(12		)	22			(41		)	15			(26		)
Adjustment to funded status of employee benefit plans	1,192			(324		)	868			423			(148		)	275
Other Comprehensive Income	$	337		$	(25	)	$	312		$	10,258		$	(3,590	)	$	6,668
(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income and have affected certain lines in the consolidated statement of comprehensive income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

40

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 12. EMPLOYEE BENEFITS

We maintain a defined benefit pension plan, or Plan, covering all employees hired prior to January 1, 2008. The benefits are based on years of service and the employee’s compensation for the highest five consecutive years in the last ten years. Contributions are intended to provide for benefits attributed to employee service to date and for those benefits expected to be earned in the future. At this time, we are not required to make a cash contribution to the Plan in 2015. The expected long-term rate of return on plan assets is 8.00 percent. Effective January 1, 2015, the Plan was amended to provide unmarried participants with the ability to name a beneficiary to receive a lump sum death benefit equal to 80% of the participant’s accrued benefit payable at normal retirement age, in the event the participant dies while employed by S&T.

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	672		$	631		$	1,344		$	1,262
Interest cost on projected benefit obligation	1,100			1,106			2,200			2,212
Expected return on plan assets	(1,807		)	(1,735		)	(3,614		)	(3,470		)
Amortization of prior service (credit) cost	(35		)	(35		)	(70		)	(70		)
Recognized net actuarial loss	468			209			936			418
Net Periodic Pension Expense	$	398		$	176		$	796		$	352

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S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 13. SEGMENTS

We operate three reportable operating segments: Community Banking, Insurance and Wealth Management.

• Our Community Banking segment offers services which include accepting time and demand deposits, originating commercial and consumer loans and providing letters of credit and credit card services.

• Our Insurance segment includes a full-service insurance agency offering commercial property and casualty insurance, group life and health coverage, employee benefit solutions and personal insurance lines.

• Our Wealth Management segment offers brokerage services, services as executor and trustee under wills and deeds, guardian and custodian of employee benefits and other trust and brokerage services, as well as a registered investment advisor that manages institutional accounts.

The following table represents total assets by reportable operating segment as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Community Banking	$	6,121,771	$	4,954,728
Insurance	8,232		7,468
Wealth Management	3,725		2,490
Total Assets	$	6,133,728	$	4,964,686

The following tables provide financial information for our three operating segments for the three and six month periods ended June 30, 2015 and 2014. The financial results of the business segments include allocations for shared services based on an internal analysis that supports line of business and branch performance measurement. Shared services include expenses such as employee benefits, occupancy expense, computer support and other corporate overhead. Even with these allocations, the financial results are not necessarily indicative of the business segments’ financial condition and results of operations as if they existed as independent entities. The information provided under the caption “Eliminations” represents operations not considered to be reportable segments and/or general operating expenses and eliminations and adjustments, which are necessary for purposes of reconciling to the Consolidated Financial Statements.

	Three Months Ended June 30, 2015
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	52,598		$	1	$	157	$	(145	)	$	52,611
Interest expense	4,056			—		—		(256		)	3,800
Net interest income	48,542			1		157		111			48,811
Provision for loan losses	2,059			—		—		—			2,059
Noninterest income	8,869			1,328		2,917		269			13,383
Noninterest expense	29,916			1,053		2,285		380			33,634
Depreciation expense	1,279			14		6		—			1,299
Amortization of intangible assets	495			13		8		—			516
Provision for income taxes	6,139			88		271		—			6,498
Net Income	$	17,523		$	161	$	504	$	—		$	18,188
	Three Months Ended June 30, 2014
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	39,845		$	—	$	136	$	(109	)	$	39,872
Interest expense	3,415			—		—		(398		)	3,017
Net interest income	36,430			—		136		289			36,855
Provision for loan losses	(1,134		)	—		—		—			(1,134		)
Noninterest income	7,522			1,245		2,828		176			11,771
Noninterest expense	25,092			1,044		2,442		465			29,043
Depreciation expense	805			13		7		—			825
Amortization of intangible assets	274			13		10		—			297
Provision for income taxes	4,637			61		177		—			4,875
Net Income	$	14,278		$	114	$	328	$	—		$	14,720

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 13. SEGMENTS – continued

	Six Months Ended June 30, 2015
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	96,483		$	1	$	298	$	(256	)	$	96,526
Interest expense	7,944			—		—		(488		)	7,456
Net interest income	88,539			1		298		232			89,070
Provision for loan losses	3,266			—		—		—			3,266
Noninterest income	16,406			2,881		5,833		347			25,467
Noninterest expense	58,603			2,190		4,505		579			65,877
Depreciation expense	2,290			26		13		—			2,329
Amortization of intangible assets	822			25		17		—			864
Provision for income taxes	10,396			224		558		—			11,178
Net Income	$	29,568		$	417	$	1,038	$	—		$	31,023
	Six Months Ended June 30, 2014
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	78,475		$	—	$	310	$	(248	)	$	78,537
Interest expense	6,897			—		—		(806		)	6,091
Net interest income	71,578			—		310		558			72,446
Provision for loan losses	(845		)	—		—		—			(845		)
Noninterest income	14,375			2,766		5,764		282			23,187
Noninterest expense	49,066			2,199		4,716		840			56,821
Depreciation expense	1,607			25		13		—			1,645
Amortization of intangible assets	566			25		22		—			613
Provision for income taxes	8,002			181		463		—			8,646
Net Income	$	27,557		$	336	$	860	$	—		$	28,753

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – continued

NOTE 14. QUALIFIED AFFORDABLE HOUSING PROJECTS

We invest in affordable housing projects primarily to satisfy our Community Reinvestment Act requirements. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. Our total investment in qualified affordable housing projects totaled $16.8 million at June 30, 2015 and $18.6 million at December 31, 2014. We had no open commitments to fund current or future investments in qualified affordable housing projects at June 30, 2015 or December 31, 2014. Amortization expense included in noninterest expense was $0.9 million and $1.9 million for the three and six months ended June 30, 2015 and $1.0 million and $2.0 million for the three and six months ended June 30, 2014. The amortization expense was offset by tax credits of $1.0 million and $2.0 million for the three and six months ended June 30, 2015 and $1.1 million and $2.2 million for the three and six months ended June 30, 2014 as a reduction to our federal tax provision.

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S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Management’s Discussion and Analysis of Financial Condition and Results of Operations, or MD&A, represents an overview of our consolidated results of operations and financial condition and highlights material changes in our financial condition and results of operations at and for the three and six month periods ended June 30, 2015 and 2014. Our MD&A should be read in conjunction with our Consolidated Financial Statements and notes thereto. The results of operations reported in the accompanying Consolidated Financial Statements are not necessarily indicative of results to be expected in future periods.

Important Note Regarding Forward-Looking Statements

This quarterly report on Form 10-Q contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These statements generally relate to our financial condition, results of operations, plans, objectives, future performance or business. They usually can be identified by the use of forward-looking language such as “will likely result,” “may,” “are expected to,” “is anticipated,” “estimate,” “forecast,” “projected,” “intends to” or other similar words. You should not place undue reliance on these statements, as they are subject to risks and uncertainties, including, but not limited to, those described in this Form 10-Q and our Annual Report on Form 10-K for the fiscal year ended December 31, 2014, which is on file with the Securities and Exchange Commission, or SEC. When considering these forward-looking statements, you should keep in mind these risks and uncertainties, as well as any cautionary statements we may make. Moreover, you should treat these statements as speaking only as of the date they are made and based only on information actually known to us at that time. We undertake no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

These forward-looking statements are based on current expectations, estimates and projections about our business and beliefs and assumptions made by management. These Future Factors are not guarantees of our future performance and involve certain risks, uncertainties and assumptions, which are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed or forecasted in these forward-looking statements.

Future Factors include:

• credit losses;

• cyber-security concerns, including an interruption or breach in the security of our information systems;

• rapid technological developments and changes;

• sensitivity to the interest rate environment including a prolonged period of low interest rates, a rapid increase in interest rates or a change in the shape of the yield curve;

• a change in spreads on interest-earning assets and interest-bearing liabilities;

• regulatory supervision and oversight, including Basel III required capital levels, and public policy changes, including environmental regulations;

• legislation affecting the financial services industry as a whole, S&T, in particular, including the effects of the Dodd-Frank Act;

• the outcome of pending and future litigation and governmental proceedings;

• increasing price and product/service competition, including new entrants;

• the ability to continue to introduce competitive new products and services on a timely, cost-effective basis;

• managing our internal growth and acquisitions, particularly our recent acquisition of Integrity Bancshares, Inc., or Integrity;

• the possibility that the anticipated benefits from the recent Integrity acquisition and any other future acquisitions cannot be fully realized in a timely manner or at all, or that integrating the operations of Integrity or future acquired operations will be more difficult, disruptive or costly than anticipated;

• containing costs and expenses;

• reliance on significant customer relationships;

• general economic or business conditions, either nationally or regionally in western Pennsylvania and our other market areas, may be less favorable than expected, resulting in among other things, a reduced demand for credit and other services;

• deterioration of the housing market and reduced demand for mortgages;

• a deterioration in the overall macroeconomic conditions or the state of the banking industry that could warrant further analysis of the carrying value of goodwill and could result in an adjustment to its carrying value resulting in a non-cash charge to net income;

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

• a re-emergence of turbulence in significant portions of the global financial and real estate markets that could impact our performance, both directly, by affecting our revenues and the value of our assets and liabilities and indirectly, by affecting the economy generally; and

• access to capital in the amounts, at the times and on the terms required to support our future businesses.

These are representative of the Future Factors that could affect the outcome of the forward-looking statements. In addition, such statements could be affected by general industry and market conditions and growth rates, general economic conditions, including interest rate fluctuations, and other Future Factors.

Critical Accounting Policies and Estimates

Our critical accounting policies involving the significant judgments and assumptions used in the preparation of the Consolidated Financial Statements as of June 30, 2015 have remained unchanged from the disclosures presented in our Annual Report on Form 10-K for the year ended December 31, 2014 under the section “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Overview

We are a bank holding company headquartered in Indiana, Pennsylvania with assets of $6.1 billion at June 30, 2015.  We operate branch locations in 16 southwestern and southcentral Pennsylvania counties, and loan production offices in northeast and central Ohio and western New York. We provide a full range of financial services with retail and commercial banking products, cash management services, insurance and trust and brokerage services. Our common stock trades on the NASDAQ Global Select Market under the symbol “STBA.”

We earn revenue primarily from interest on loans and securities and fees charged for financial services provided to our customers. Offsetting these revenues are the cost of deposits and other funding sources, provision for loan losses and other operating costs such as salaries and employee benefits, data processing, occupancy and tax expense.

Our mission is to become the financial services provider of choice within the markets that we serve. We strive to do this by delivering exceptional service and value, one customer at a time. Our strategic plan focuses on organic growth, which includes growth within our current footprint and growth through market expansion. We also actively evaluate acquisition opportunities as another source of growth. Our strategic plan includes a collaborative model that combines expertise from all of our business segments and focuses on satisfying each customer’s individual financial objectives.

On March 4, 2015, we completed a merger with Integrity Bancshares, Inc., or the Merger, which expanded our geographic footprint into southcentral Pennsylvania with eight branches in Cumberland, Dauphin, Lancaster and York counties. The transaction was valued at $172.0 million and added total assets of $980.7 million, including $788.7 million in loans and $115.4 million of goodwill, and $722.3 million in deposits. Integrity Bank became a separate subsidiary of S&T upon completion of the Merger and was subsequently merged into S&T Bank on May 8, 2015. For a period of at least three years following the Merger, S&T Bank intends to operate bank branches in the markets that were previously served by Integrity using the name "Integrity Bank – A Division of S&T Bank".

During the six months ended June 30, 2015, we successfully executed on our growth strategy in our current footprint and by expanding into new markets. Our portfolio loans grew $929.8 million, or 24.0 percent, since December 31, 2014, primarily due to the increase in loans from the Merger. On March 23, 2015, we expanded our commercial banking operations by opening a loan production office in western New York.

Our focus continues to be on loan and deposit growth and implementing opportunities to increase fee income while maintaining a strong expense discipline. Additionally, with our recent expansion into new markets, we are focused on executing our strategy to successfully build our brand and grow our business in these markets.The low interest rate environment remains a challenge for our net interest income, but our organic growth will help to mitigate the impact.

Earnings Summary

Net income for the three months ended June 30, 2015 was $18.2 million, or $0.52 per diluted share, compared to $14.7 million, or $0.49 per diluted share, for the same period in 2014. Net income for the six months ended June 30, 2015 was $31.0 million, or $0.94 per diluted share, compared to $28.8 million, or $0.97 per diluted share, for the same period in 2014. The increase in net income was primarily due to an increase in net interest income and noninterest income, offset by higher provision for loan losses and noninterest expense. Integrity's results have been included in our financial statements since the consummation of the Merger on March 4, 2015. Our results included $0.9 million of merger related expenses for the three months ended June 30, 2015 and $3.2 million for the six months ended June 30, 2015.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

Net interest income increased $12.0 million, or 32.4 percent, for the second quarter of 2015 compared to the same period in 2014 and increased $16.6 million, or 22.9 percent, for the six months ended June 30, 2015. The increases were primarily due to the increase in average interest-earning assets of $1.2 billion and $896.4 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. Net interest income was favorably impacted by accretion resulting from purchase accounting fair value adjustments of $2.7 million for the three months and six months ended June 30, 2015.

The provision for loan losses increased $3.2 million to $2.1 million for the three months ended June 30, 2015 and $4.1 million to $3.3 million for the six months ended June 30, 2015 compared to the same periods in 2014. We had net loan charge-offs in both the three and six months ended June 30, 2015 compared to net recoveries in the same periods in the prior year. Net loan charge-offs increased $2.4 million to $1.4 million for the three months ended June 30, 2015 and increased $3.5 million to $2.4 million for the six months ended June 30, 2015. This compares to net recoveries of $1.1 million and $1.2 million for the same periods in 2014.

Noninterest income increased $1.6 million for the three months ended June 30, 2015 and $2.3 million for the six months ended June 30, 2015 compared to the same periods in 2014. The increases in noninterest income were primarily due to higher income as a result of the Merger and higher mortgage banking income.

Total noninterest expense increased $5.3 million for the three months ended June 30, 2015 and $10.0 million for the six months ended June 30, 2015 compared to the same periods in 2014. The increases were primarily due to merger related expenses, higher operating expenses related to the addition of locations related to the Merger and higher salaries and employee benefit costs.

The provision for income taxes increased $1.6 million for the three months ended June 30, 2015 and increased $2.5 million for the six months ended June 30, 2015 as compared to the same periods in 2014. The increase to the tax provision was due to an increase in our annual projected tax rate for 2015 as a result of higher projected pretax income primarily related to the Merger.

Explanation of Use of Non-GAAP Financial Measures

In addition to the results of operations presented in accordance with generally accepted accounting principles, or GAAP, management uses, and this quarterly report contains or references, certain non-GAAP financial measures, such as net interest income on a fully taxable equivalent, or FTE, basis and operating revenue. Management believes these non-GAAP financial measures provide information useful to investors in understanding our underlying business, operational performance and performance trends as they facilitate comparisons with the performance of others in the financial services industry. Although management believes that these non-GAAP financial measures enhance investors’ understanding of our business and performance, these non-GAAP financial measures should not be considered an alternative to GAAP or considered to be more important than financial results determined in accordance with GAAP, nor are they necessarily comparable with non-GAAP measures which may be presented by other companies.

We believe the presentation of net interest income on a FTE basis ensures the comparability of net interest income arising from both taxable and tax-exempt sources and is consistent with industry practice. Interest income per the Consolidated Statements of Comprehensive Income is reconciled to net interest income adjusted to a FTE basis in the Net Interest Income section of the Results of Operations for the three and six months ended June 30, 2015 and 2014.

Operating revenue is the sum of net interest income and noninterest income less non-recurring income and expenses. In order to understand the significance of net interest income to our business and operating results, we believe it is appropriate to evaluate the significance of net interest income as a component of operating revenue.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

RESULTS OF OPERATIONS

Three and Six Months Ended June 30, 2015 Compared to

Three and Six Months Ended June 30, 2014

Net Interest Income

Our principal source of revenue is net interest income. Net interest income represents the difference between the interest and fees earned on interest-earning assets and the interest paid on interest-bearing liabilities. Net interest income is affected by changes in the average balance of interest-earning assets and interest-bearing liabilities and changes in interest rates and spreads. Maintaining consistent spreads between interest-earning assets and interest-bearing liabilities is significant to our financial performance because net interest income comprised 78 percent of operating revenue (net interest income plus noninterest income, excluding security gains/losses and non-recurring income) for both the three and six months ended June 30, 2015 and 77 percent and 76 percent of operating revenue for the three and six months ended June 30, 2014. The level and mix of interest-earning assets and interest-bearing liabilities is managed by our Asset and Liability Committee, or ALCO, in order to mitigate interest rate and liquidity risks of the balance sheet. A variety of ALCO strategies were implemented, within prescribed ALCO risk parameters, to produce an acceptable level of net interest income.

The interest income on interest-earning assets and the net interest margin are presented on a FTE basis. The FTE basis adjusts for the tax benefit of income on certain tax-exempt loans and securities using the federal statutory tax rate of 35 percent for each period and the dividend-received deduction for equity securities. We believe this to be the preferred industry measurement of net interest income that provides a relevant comparison between taxable and non-taxable amounts.

The following table reconciles interest income per the Consolidated Statements of Comprehensive Income to net interest income and rates adjusted to a FTE basis for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Total interest income	$	52,611		$	39,872		$	96,526		$	78,537
Total interest expense	3,800			3,017			7,456			6,091
Net interest income per consolidated statements of comprehensive income	48,811			36,855			89,070			72,446
Adjustment to FTE basis	1,494			1,394			2,886			2,717
Net Interest Income (FTE) (non-GAAP)	$	50,305		$	38,249		$	91,956		$	75,163
Net interest margin	3.56		%	3.43		%	3.47		%	3.41		%
Adjustment to FTE basis	0.11		%	0.13		%	0.11		%	0.13		%
Net Interest Margin (FTE) (non-GAAP)	3.67		%	3.56		%	3.58		%	3.54		%

Income amounts are annualized for rate calculations.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

Average Balance Sheet and Net Interest Income Analysis

The following table provides information regarding the average balances, interest and rates earned on interest-earning assets and the average balances, interest and rates paid on interest-bearing liabilities for the periods presented:

	Three months ended June 30, 2015							Three months ended June 30, 2014
(dollars in thousands)	Average Balance			Interest		Rate		Average Balance			Interest		Rate
ASSETS
Loans (1)(2)	$	4,764,852		$	49,853	4.20	%	$	3,650,050		$	37,444	4.11	%
Interest-bearing deposits with banks	65,246			41		0.25	%	88,706			62		0.28	%
Taxable investment securities (3)	513,639			2,486		1.94	%	427,976			2,129		1.99	%
Tax-exempt investment securities (2)	136,824			1,536		4.49	%	129,687			1,507		4.65	%
Federal Home Loan Bank and other restricted stock	22,166			189		3.42	%	12,752			124		3.89	%
Total Interest-earning Assets	5,502,727			54,105		3.94	%	4,309,171			41,266		3.84	%
Noninterest-earning assets:
Cash and due from banks	54,125							48,846
Premises and equipment, net	49,016							35,689
Other assets	482,699							336,985
Less allowance for loan losses	(48,492		)					(49,075		)
Total Assets	$	6,040,075						$	4,681,616
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing demand	$	660,058		$	239	0.15	%	$	311,719		$	20	0.03	%
Money market	427,354			204		0.19	%	327,666			125		0.15	%
Savings	1,073,360			420		0.16	%	1,035,691			403		0.16	%
Certificates of deposit	1,120,256			1,914		0.68	%	899,086			1,742		0.78	%
Brokered deposits	347,013			274		0.32	%	230,036			186		0.32	%
Total Interest-bearing Deposits	3,628,041			3,051		0.34	%	2,804,198			2,476		0.35	%
Securities sold under repurchase agreements	45,017			1		0.01	%	30,718			2		0.01	%
Short-term borrowings	228,505			190		0.33	%	108,640			80		0.30	%
Long-term borrowings	78,912			192		0.98	%	20,873			156		3.01	%
Junior subordinated debt securities	49,905			366		2.93	%	45,619			303		2.66	%
Total Interest-bearing Liabilities	4,030,380			3,800		0.38	%	3,010,048			3,017		0.40	%
Noninterest-bearing liabilities:
Noninterest-bearing demand	1,175,620							1,028,996
Other liabilities	67,500							51,391
Shareholders’ equity	766,575							591,181
Total Liabilities and Shareholders’ Equity	$	6,040,075						$	4,681,616
Net Interest Income(2)(3)				$	50,305						$	38,249
Net Interest Margin(2) (3)						3.67	%						3.56	%

⁽¹⁾ Nonaccruing loans are included in the daily average loan amounts outstanding.

⁽²⁾ Tax-exempt income is on a FTE basis using the statutory federal corporate income tax rate of 35 percent for 2015 and 2014.

⁽³⁾ Taxable investment income is adjusted for the dividend-received deduction for equity securities.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

	Six months ended June 30, 2015							Six months ended June 30, 2014
(dollars in thousands)	Average Balance			Interest		Rate		Average Balance			Interest		Rate
ASSETS
Loans (1)(2)	$	4,445,515		$	90,585	4.11	%	$	3,613,470		$	73,878	4.12	%
Interest-bearing deposits with banks	65,410			76		0.23	%	118,419			147		0.25	%
Taxable investment securities (3)	509,271			4,968		1.95	%	411,535			4,079		1.98	%
Tax-exempt investment securities (2)	139,501			3,105		4.45	%	125,591			2,936		4.68	%
Federal Home Loan Bank and other restricted stock	18,815			678		7.20	%	13,070			214		3.28	%
Total Interest-earning Assets	5,178,512			99,412		3.87	%	4,282,085			81,254		3.82	%
Noninterest-earning assets:
Cash and due from banks	52,122							48,463
Premises and equipment, net	45,006							35,662
Other assets	430,990							339,070
Less allowance for loan losses	(48,557		)					(48,255		)
Total Assets	$	5,658,073						$	4,657,025
LIABILITIES AND SHAREHOLDERS’ EQUITY
Interest-bearing demand	$	546,663		$	326	0.12	%	$	312,565		$	35	0.02	%
Money market	395,324			365		0.19	%	338,928			253		0.15	%
Savings	1,062,911			823		0.16	%	1,025,007			791		0.16	%
Certificates of deposit	1,056,254			4,051		0.77	%	904,869			3,565		0.79	%
Brokered deposits	304,023			493		0.33	%	210,426			342		0.33	%
Total Interest-bearing Deposits	3,365,175			6,058		0.36	%	2,791,795			4,986		0.36	%
Securities sold under repurchase agreements	42,542			2		0.01	%	33,641			2		0.01	%
Short-term borrowings	232,451			375		0.33	%	118,156			178		0.30	%
Long-term borrowings	49,165			334		1.37	%	21,168			320		3.04	%
Junior subordinated debt securities	48,547			687		2.85	%	45,619			605		2.68	%
Total Interest-bearing Liabilities	3,737,880			7,456		0.40	%	3,010,379			6,091		0.41	%
Noninterest-bearing liabilities:
Noninterest-bearing demand	1,138,912							1,009,506
Other liabilities	66,080							52,116
Shareholders’ equity	715,201							585,024
Total Liabilities and Shareholders’ Equity	$	5,658,073						$	4,657,025
Net Interest Income(2)(3)				$	91,956						$	75,163
Net Interest Margin(2) (3)						3.58	%						3.54	%

⁽¹⁾ Nonaccruing loans are included in the daily average loan amounts outstanding.

⁽²⁾ Tax-exempt income is on a FTE basis using the statutory federal corporate income tax rate of 35 percent for 2015 and 2014.

⁽³⁾ Taxable investment income is adjusted for the dividend-received deduction for equity securities.

Net interest income on a FTE basis increased $12.1 million, or 31.5 percent, for the three months ended June 30, 2015 and $16.8 million, or 22.3 percent, for the six months ended June 30, 2015 compared to the same periods in 2014. The net interest margin on a FTE basis increased 11 basis points for the three months ended June 30, 2015 and 4 basis points for the six months ended June 30, 2015 compared to the same periods of 2014. Net interest income was favorably impacted by accretion resulting from purchase accounting fair value adjustments of $2.7 million. This impacted net interest margin on a FTE basis by 21 basis points for the three months ended June 30, 2015 and 11 basis points for the six months ended June 30, 2015.

Interest income on a FTE basis increased $12.8 million, or 31.1 percent, to $54.1 million and $18.2 million, or 22.3 percent, to $99.4 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. Average interest-earning assets increased $1.2 billion and $896.4 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. The average interest-earning asset increases were primarily due to higher average loan balances of

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$1.1 billion and $832.0 million, related to the Merger and organic growth as compared to the same periods in 2014. The rate earned on loans was favorably impacted by purchase accounting accretion of $2.0 million, or 18 basis points and 10 basis points for the three and six months ended June 30, 2015. Average interest-bearing deposits with banks decreased $23.5 million and $53.0 million for the three and six months ended June 30, 2015 compared to the same periods of 2014. Average investment securities increased $92.8 million and $111.6 million for the three and six months ended June 30, 2015. The $2.0 million loan purchase accounting accretion had a positive impact on the interest-earning asset rate of 16 basis points and nine basis points for the three and six months ended June 30, 2015. Overall, the FTE rate on interest-earning assets increased 10 basis points and five basis points compared to the same periods in 2014.

Interest expense increased $0.8 million and $1.4 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. The increase in interest expense was mainly driven by the Merger and organic growth of $823.8 million and $573.4 million in average interest-bearing deposits for the three and six months ended June 30, 2015 compared to the same periods in 2014. Average interest-bearing customer deposits, which excludes brokered deposits, increased $706.9 million and $479.8 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. Average brokered deposits increased by $117.0 million and $93.6 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. Interest expense on average borrowings increased $0.2 million and $0.3 million for the three and six months ending June 30, 2015 compared to the same periods in 2014.The $0.7 million certificate of deposit purchase accounting accretion had a positive impact on the interest-bearing liability rate of seven basis points and four basis points for the three and six months ended June 30, 2015. Overall, the cost of interest-bearing liabilities decreased by two basis points and one basis point compared to the same periods in 2014.

The following table sets forth for the periods presented a summary of the changes in interest earned and interest paid resulting from changes in volume and changes in rates:

	Three Months Ended June 30, 2015 Compared to June 30, 2014									Six Months Ended June 30, 2015 Compared to June 30, 2014
(dollars in thousands)	Volume (4)			Rate (4)			Net			Volume (4)			Rate (4)			Net
Interest earned on:
Loans(1) (2)	$	11,436		$	973		$	12,409		$	17,009		$	(302	)	$	16,707
Interest-bearing deposits with banks	(16		)	(5		)	(21		)	(66		)	(5		)	(71		)
Taxable investment securities (3)	426			(69		)	357			969			(80		)	889
Tax-exempt investment securities(2)	83			(54		)	29			325			(156		)	169
Federal Home Loan Bank and other restricted stock	91			(26		)	65			94			370			464
Total Interest-earning Assets	12,020			819			12,839			18,331			(173		)	18,158
Interest paid on:
Interest-bearing demand	23			196			219			26			265			291
Money market	38			41			79			42			70			112
Savings	14			3			17			29			3			32
Certificates of deposit	430			(258		)	172			597			(111		)	486
Brokered deposits	95			(7		)	88			152			(1		)	151
Short-term borrowings	88			21			109			172			25			197
Long-term borrowings	437			(401		)	36			420			(406		)	14
Junior subordinated debt securities	28			35			63			39			43			82
Total Interest-bearing Liabilities	1,153			(370		)	783			1,477			(112		)	1,365
Net Change in Net Interest Income	$	10,867		$	1,189		$	12,056		$	16,854		$	(61	)	$	16,793

⁽¹⁾ Nonaccruing loans are included in the daily average loan amounts outstanding.

⁽²⁾ Tax-exempt income is on a FTE basis using the statutory federal corporate income tax rate of 35 percent for 2015 and 2014.

⁽³⁾ Taxable investment income is adjusted for the dividend-received deduction for equity securities.

⁽⁴⁾ Changes to rate/volume are allocated to both rate and volume on a proportionate dollar basis.

Provision for Loan Losses

The provision for loan losses is the adjustment to the allowance for loan losses, or ALL, after considering loan charge-offs and recoveries to bring the ALL to a level determined to be appropriate in management's judgment to absorb probable losses inherent in the loan portfolio. The provision for loan losses increased $3.2 million to $2.1 million for the three months ended

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June 30, 2015 and $4.1 million to $3.3 million for the six months ended June 30, 2015 compared to the same periods in 2014. We had net loan charge-offs in both the three and six months ended June 30, 2015 compared to net recoveries in the same periods in the prior year. Net loan charge-offs increased $2.4 million to $1.4 million for the three months ended June 30, 2015 and increased $3.5 million to $2.4 million for the six months ended June 30, 2015. This compares to net recoveries of $1.1 million and $1.2 million for the same periods in 2014.

Nonaccrual loans increased $4.2 million to $19.1 million at June 30, 2015 compared to $14.9 million at June 30, 2014. Total special mention and substandard commercial loans have increased $60.1 million over the last twelve months to $203.1 million at June 30, 2015, primarily related to the Merger. The ALL was 1.02 percent of total portfolio loans and 1.23 percent of total originated loans at June 30, 2015 compared to 1.25 percent and 1.29 percent at June 30, 2014. The decrease in the overall level of the reserve as a percentage to total portfolio loans is due to the Merger as the acquired loans were recorded at fair value. Refer to “Allowance for Loan Losses” in the MD&A of this report for additional information.

Noninterest Income

	Three Months Ended June 30,										Six Months Ended June 30,
(dollars in thousands)	2015			2014		$ Change			% Change		2015			2014		$ Change			% Change
Securities (losses)/gains, net	$	(34	)	$	40	$	(74	)	NM		$	(34	)	$	41	$	(75	)	NM
Wealth management fees	2,930			2,837		93			3.3		5,853			5,792		61			1.1
Debit and credit card fees	3,020			2,724		296			10.9		5,736			5,226		510			9.8
Service charges on deposit accounts	2,877			2,574		303			11.8		5,459			5,083		376			7.4
Insurance fees	1,391			1,425		(34		)	(2.4	)	3,041			3,102		(61		)	(2.0	)
Mortgage banking	782			264		518			196.2		1,308			396		912			230.3
Other	2,417			1,907		510			26.7		4,104			3,547		557			15.7
Total Noninterest Income	$	13,383		$	11,771	$	1,612		13.7	%	$	25,467		$	23,187	$	2,280		9.8	%
NM - percentage not meaningful

Noninterest income increased $1.6 million, or 13.7 percent, and $2.3 million, or 9.8 percent, to $13.4 million and $25.5 million for the three and six month periods ended June 30, 2015 compared to the same periods in 2014. The increases related primarily to higher mortgage banking fees, other noninterest income, services charges on deposit accounts and debit and credit card fees for both periods.

Mortgage banking income increased $0.5 million and $0.9 million for the three and six month periods ended June 30, 2015 compared to the same periods in 2014. The increase in mortgage banking income related to an increase in the volume of loans originated for sale in the secondary market, in part due to the Merger, and more favorable pricing on loan sales. During the six months ended June 30, 2015, we had $41.4 million in loan sales compared to $13.1 million during the same period in 2014.

The increases in other noninterest income of $0.5 million and $0.6 million for the three and six month periods ended June 30, 2015 related to higher interest rate swap fees from our commercial customers, letter of credit fees and bank owned life insurance, or BOLI, income. The increases in letter of credit fees and BOLI income were primarily related to the Merger. Service charges on deposit accounts increased $0.3 million and $0.4 million for the three and six month periods ended June 30, 2015 due to the Merger and fee increases in the second half of 2014. The increases in debit and credit card fees of $0.3 million and $0.5 million were primarily due to an increase in merchant revenue resulting from the timing of referral revenue and increased debit card usage.

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Noninterest Expense

	Three Months Ended June 30,									Six Months Ended June 30,
(dollars in thousands)	2015		2014		$ Change			% Change		2015		2014		$ Change			% Change
Salaries and employee benefits (1)	$	17,455	$	15,772	$	1,683		10.7	%	$	34,235	$	31,148	$	3,087		9.9	%
Net occupancy (1)	2,682		1,984		698			35.2		5,270		4,214		1,056			25.1
Data processing (1)	2,555		2,219		336			15.1		4,876		4,314		562			13.0
Furniture and equipment	1,582		1,277		305			23.9		2,808		2,548		260			10.2
Other Taxes	1,159		893		266			29.8		2,002		1,524		478			31.4
Marketing	1,193		960		233			24.3		2,009		1,578		431			27.3
Merger related expense	866		—		866			NM		3,167		—		3,167			NM
FDIC insurance	808		579		229			39.6		1,503		1,210		293			24.2
Professional services and legal (1)	801		875		(74		)	(8.5	)	1,324		1,538		(214		)	(13.9	)
Other noninterest expense(1)	6,348		5,606		742			13.2		11,876		11,005		871			7.9
Total Noninterest Expense	$	35,449	$	30,165	$	5,284		17.5	%	$	69,070	$	59,079	$	9,991		16.9	%

⁽¹⁾ Excludes merger related expense for 2015.

NM - percentage is not meaningful

Noninterest expense increased $5.3 million, or 17.5 percent, and $10.0 million, or 16.9 percent, to $35.4 million and $69.1 million for the three and six month periods ended June 30, 2015 compared to the same periods of 2014. The increases were due in part to $0.9 million and $3.2 million in merger related expenses and higher operating expenses due to the Merger.

The total merger related expenses for the six month period ended June 30, 2015 of $3.2 million included $1.3 million for data processing contract termination and conversion costs, $1.2 million in legal and professional expenses, $0.4 million in severance payments and $0.3 million in various other expenses.

Salaries and employee benefits expense increased $1.7 million and $3.1 million for the three and six months ended June 30, 2015 compared to the same periods in 2014, primarily due to additional employees, annual merit increases and higher pension and incentive expense. For the three and six months ended June 30, 2015, approximately $1.1 million and $1.9 million of the increase related to the addition of new employees resulting from the Merger. Annual merit increases resulted in $0.4 million of additional salary expense for the three month period ended and $0.8 million for the six month period ended June 30, 2015 compared to the same periods in the prior year. Pension expense increased $0.2 million for the three months ended and $0.4 million for the six months ended due to a change in actuarial assumptions used to calculate our pension liability. Incentive expense increased $0.5 million for the three months ended and $0.9 million for the six months ended June 30, 2015 due to a higher number of participants and strong performance in the first half of 2015.

Other noninterest expense increased $0.7 million and $0.9 million for the three and six months ended June 30, 2015 compared to the same periods in 2014. The increase related to higher loan collection expenses, data lines, travel, lodging and training all primarily related to the Merger.

Net occupancy expense increased $0.7 million and $1.1 million for the three and six months ended June 30, 2015 compared to the same periods in 2014 and furniture and equipment expense increased $0.3 million for both periods primarily due to the additional locations acquired as part of the Merger. Data processing increased $0.3 million and $0.6 million for the three and six months ended June 30, 2015, primarily due to an increased customer processing base due to the Merger. Other taxes increased $0.3 million and $0.5 million due to the Merger. Marketing expense increased $0.2 million and $0.4 million related to the Merger and the timing of various promotional programs.

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Provision for Income Taxes

The provision for income taxes increased $1.6 million to $6.5 million for the three months ended June 30, 2015 and $2.5 million to $11.2 million for the six month period ended June 30, 2015 compared to a provision of $4.9 million and $8.6 million for the same periods in 2014. The increases to the provision for income taxes for the three and six month periods ended June 30, 2015 were primarily due to higher pretax income and an increase in our 2015 annual projected tax rate. The increase in our annual projected tax rate is due to higher projected pretax income for the year. The effective tax rate for the six months ended June 30, 2015 increased to 26.5 percent compared to 23.1 percent for the same period in 2014.

Financial Condition

June 30, 2015

Total assets increased $1.1 billion to $6.1 billion at June 30, 2015 compared to $5.0 billion at December 31, 2014. The increase was primarily a result of the Merger, which increased total assets $980.7 million, including adding $115.3 million of goodwill. Portfolio loans increased $929.8 million compared to December 31, 2014 primarily due to organic growth and the Merger, which added $788.7 million of loans. Our commercial loan portfolio increased by $746.8 million, or 25.8 percent, of which $608.2 million related to the Merger and our consumer loan portfolio increased by $183.0 million, or 18.7 percent, of which $180.5 million related to the Merger. Securities increased $26.4 million, or 4.1 percent, compared to December 31, 2014 due to normal purchase activity.

Our deposit base increased $950.6 million with total deposits of $4.9 billion at June 30, 2015 compared to $3.9 billion at December 31, 2014. The increase in deposits consisted of $722.3 million related to the Merger, $132.7 million of organic growth in customer deposits and $95.5 million of brokered deposits. Borrowings increased by $55.4 million to $441.1 million at June 30, 2015 compared to $385.7 million at December 31, 2014. Long-term borrowings increased $98.8 million during the second quarter of 2015 as a result of shifting $100.0 million of short-term borrowings to a long-term variable rate borrowing. Short-term borrowings decreased $59.0 million due to the shift to long-term borrowings offset by additional funding needed to support our asset growth. Total shareholders' equity increased by $162.8 million, or 26.8 percent, at June 30, 2015 compared to December 31, 2014. The increase was primarily related to the issuance of common stock for the Merger of $142.5 million and net income of $31.0 million, which was partially offset by dividends of $11.6 million.

Securities Activity

(dollars in thousands)	June 30, 2015		December 31, 2014		$ Change
U.S. Treasury securities	$	15,018	$	14,880	$	138
Obligations of U.S. government corporations and agencies	270,112		269,285		827
Collateralized mortgage obligations of U.S. government corporations and agencies	139,577		118,006		21,571
Residential mortgage-backed securities of U.S. government corporations and agencies	43,419		46,668		(3,249		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,676		39,673		10,003
Obligations of states and political subdivisions	139,947		142,702		(2,755		)
Debt Securities Available-for-Sale	657,749		631,214		26,535
Marketable equity securities	8,875		9,059		(184		)
Total Securities Available-for-Sale	$	666,624	$	640,273	$	26,351

We invest in various securities in order to maintain a source of liquidity, to satisfy various pledging requirements, increase net interest income and as a tool of the ALCO to reposition the balance sheet for interest rate risk purposes. Securities are subject to market risk that could negatively affect the level of liquidity available to us. Security purchases are subject to an investment policy approved annually by our Board of Directors and administered through ALCO and our treasury function. The securities portfolio increased $26.4 million from December 31, 2014 to June 30, 2015, primarily due to normal purchase activity. We acquired $11.5 million of securities through the Merger. During the three months ended June 30, 2015, we sold all of the acquired securities.

Management evaluates the securities portfolio for other than temporary impairment, or OTTI, on a quarterly basis. At June 30, 2015 our bond portfolio was in a net unrealized gain position of $8.7 million, compared to a net unrealized gain of $9.3 million at December 31, 2014. At June 30, 2015, total gross unrealized gains were $10.3 million offset by total gross unrealized losses of $1.6 million. At December 31, 2014, total gross unrealized gains were $11.2 million offset by gross unrealized losses of $1.8 million. Unrealized losses were not related to the underlying credit quality of the bond portfolio. All debt securities are

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determined to be investment grade and are paying principal and interest according to the contractual terms of the securities. There were no unrealized losses on marketable equity securities as of June 30, 2015 and December 31, 2014. We do not intend to sell and it is not more likely than not that we will not be required to sell any of the securities in an unrealized loss position before recovery of their amortized cost. During the six months of 2015 and 2014 we did not record any OTTI. The performance of the debt and equity securities markets could generate impairments in future periods requiring realized losses to be reported.

Loan Composition

	June 30, 2015				December 31, 2014
(dollars in thousands)	Amount		% of Loans		Amount		% of Loans
Commercial
Commercial real estate	$	2,054,935	42.8	%	$	1,682,236	43.5	%
Commercial and industrial	1,239,382		25.8	%	994,138		25.7	%
Construction	344,983		7.2	%	216,148		5.6	%
Total Commercial Loans	3,639,300		75.8	%	2,892,522		74.8	%
Consumer
Residential mortgage	599,502		12.5	%	489,586		12.7	%
Home equity	457,813		9.5	%	418,563		10.8	%
Installment and other consumer	94,437		2.0	%	65,567		1.7	%
Construction	7,446		0.2	%	2,508		0.1	%
Total Consumer Loans	1,159,198		24.2	%	976,224		25.2	%
Total Portfolio Loans	4,798,498		100.0	%	3,868,746		100.0	%
Loans Held for Sale	13,634				2,970
Total Loans	$	4,812,132			$	3,871,716

Our loan portfolio represents our most significant source of interest income. The risk that borrowers will be unable to pay such obligations is inherent in the loan portfolio. Other conditions such as downturns in the borrower's industry or the overall economic climate can significantly impact the borrower’s ability to pay.

Total portfolio loans increased $929.7 million to $4.8 billion compared to $3.9 billion at December 31, 2014. The increase was primarily due to the addition of $788.7 million of loans from the Merger and $141.0 million of organic growth. The $788.7 million of loans related to the Merger consisted of $331.6 million of commercial real estate, or CRE, $184.2 million of commercial and industrial, or C&I, $92.4 million of commercial construction, $116.9 million of residential mortgage, $25.6 million of home equity, $36.1 million of installment and other consumer and $1.9 million of consumer construction.

Allowance for Loan Losses

We maintain an ALL at a level determined to be adequate to absorb estimated probable credit losses inherent within the loan portfolio as of the balance sheet date. Determination of an adequate ALL is inherently subjective and may be subject to significant changes from period to period. The methodology for determining the ALL has two main components: 1) evaluation and impairment tests of individual loans, and 2) impairment tests of certain groups of homogeneous loans with similar risk characteristics.

An inherent risk to the loan portfolio as a whole is the condition of the local economy. In addition, each loan segment carries with it risks specific to the segment. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer. The following is a discussion of the key risks by portfolio segment that management assesses in preparing the ALL.

CRE loans are secured by commercial purpose real estate, including both owner occupied properties and investment properties for various purposes such as hotels, strip malls and apartments. Operations of the individual projects as well as global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type as well as the business prospects of the lessee, if the project is not owner occupied.

C&I loans are made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific

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risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial construction loans are made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more risks depending on the type of project and the experience and resources of the developer.

Consumer real estate loans are secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residences, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing markets can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other consumer loans are made to individuals and may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

The following tables summarize the ALL and recorded investments in loans by category for the dates presented:

	June 30, 2015
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	567	$	18,451	$	19,018	$	19,297	$	2,035,638	$	2,054,935
Commercial and industrial	—		13,308		13,308		10,125		1,229,257		1,239,382
Commercial construction	—		7,671		7,671		9,293		335,690		344,983
Consumer real estate	37		6,990		7,027		6,944		1,057,817		1,064,761
Other consumer	4		1,786		1,790		196		94,241		94,437
Total	$	608	$	48,206	$	48,814	$	45,855	$	4,752,643	$	4,798,498

	December 31, 2014
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total
Commercial real estate	$	—	$	20,164	$	20,164	$	19,890	$	1,662,346	$	1,682,236
Commercial and industrial	—		13,668		13,668		9,218		984,920		994,138
Commercial construction	—		6,093		6,093		7,605		208,543		216,148
Consumer real estate	43		6,290		6,333		7,202		903,455		910,657
Other consumer	11		1,642		1,653		62		65,505		65,567
Total	$	54	$	47,857	$	47,911	$	43,977	$	3,824,769	$	3,868,746

	June 30, 2015			December 31, 2014
Ratio of net charge-offs to average loans outstanding	0.11	%	*	0.00%
Allowance for loan losses as a percentage of total loans	1.02	%		1.24	%
Allowance for loan losses as a percentage of originated loans	1.23	%		1.27	%
Allowance for loan losses to nonperforming loans	255	%		385	%

^* Annualized

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

The ALL was $48.8 million, or 1.02 percent of total portfolio loans and 1.23 percent of originated loans at June 30, 2015 compared to $47.9 million, or 1.24 percent of total portfolio loans and 1.27 percent of originated loans at December 31, 2014. The decrease in the ALL to total portfolio loans from December 31, 2014 to June 30, 2015 is due to the Merger. Acquired loans of $788.7 million were recorded at fair value with no carryover of the ALL. Credit deterioration on acquired loans incurred subsequent to the acquisition date will be recognized in the ALL through the provision. During the second quarter of 2015, one CRE impaired loan required a specific reserve of $0.6 million. Impaired loans increased $1.9 million from December 31, 2014. During 2015 there were $8.6 million of newly identified impaired loans which were partially offset by pay-downs. The reserve for loans collectively evaluated for impairment did not change significantly at June 30, 2015 compared to December 31, 2014.

Net loan charge-offs were $1.4 million and $2.4 million for the three months and six months ended June 30, 2015. Commercial special mention and substandard loans for the second quarter increased by $90.9 million to $203.1 million compared to $112.2 million at December 31, 2014 primarily related to the acquired loans which were recorded at fair value on the acquisition date.

We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. Loans are considered to be impaired when based upon current information and events it is probable that we will be unable to collect all principal and interest payments due according to the original contractual terms of the loan agreement. Our methodology for evaluating whether a loan is impaired includes risk-rating credits on an individual basis and consideration of the borrower’s overall financial condition, payment history and available cash resources. In measuring impairment, we primarily utilize fair market value of the collateral; however, we also use discounted cash flow when warranted.

Troubled debt restructurings, or TDRs, whether on accrual or nonaccrual status, are also classified as impaired loans. TDRs are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower that we would not otherwise grant. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual there may be instances of principal forgiveness. Generally these concessions are for a period of at least six months. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed by the borrower as TDRs.

An accruing loan that is modified into a TDR can remain in accrual status if, based on a current well-documented credit analysis, collection of principal and interest in accordance with the modified terms is reasonably assured, and the borrower has demonstrated sustained historical repayment performance for a reasonable period before the modification. Additionally, TDRs can be returned to accruing status if the following criteria are met: 1) the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and 2) there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring. All TDRs will be reported as an impaired loan for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is expected that the remaining principal and interest will be fully collected according to the restructured agreement. For all TDRs, regardless of size, as well as all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate. All impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements noted above.

As an example, consider a substandard commercial construction loan that is currently 90 days past due where the loan is restructured to extend the maturity date for a period longer than would be considered an insignificant period of time. The post-modification interest rate given to the borrower is considered to be lower than the current market rate for new debt with similar risk and all other terms remain the same according to the original loan agreement. This loan will be considered a TDR as the borrower is experiencing financial difficulty and a concession has been granted due to the long extension, resulting in payment delay as well as the rate being lower than current market rate for new debt with similar risk. The loan will be reported as a nonaccrual TDR and an impaired loan. In addition, the loan could be charged down to the fair value of the collateral if a confirmed loss exists. If the loan subsequently performs, by means of making on-time principal and interest payments according to the newly restructured terms for a period of six months, and it is expected that all remaining principal and interest will be collected according to the terms of the restructured agreement, the loan will be returned to accrual status and reported as an accruing TDR. The loan will remain an impaired loan for the remaining life of the loan because the interest rate was not adjusted to be equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk.

At June 30, 2015, TDR’s totaled $41.5 million, which was a decrease of $0.9 million from December 31, 2014. Of the total TDR’s for the six months ended June 30, 2015, $32.6 million, or 78.5 percent, were accruing while $8.9 million, or 21.5 percent, were nonaccrual.

The charge-off policy for commercial loans requires that loans and other obligations that are not collectible be promptly charged-off when the loss becomes probable, regardless of the delinquency status of the loan. We may elect to recognize a

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

partial charge-off when management has determined that the value of collateral is less than the remaining investment in the loan. A loan or obligation does not need to be charged-off, regardless of delinquency status, if (i) management has determined there exists sufficient collateral to protect the remaining loan balance and (ii) there exists a strategy to liquidate the collateral. Management may also consider a number of other factors to determine when a charge-off is appropriate. These factors may include, but are not limited to:

• The status of a bankruptcy proceeding

• The value of collateral and probability of successful liquidation; and/or

• The status of adverse proceedings or litigation that may result in collection

Consumer unsecured loans and secured loans are evaluated for charge-off after the loan becomes 90 days past due. Unsecured loans are fully charged-off and secured loans are charged-off to the estimated fair value of the collateral less the cost to sell.

Our allowance for lending-related commitments is computed using a methodology similar to that used to determine the ALL. Amounts are added to the allowance for lending-related commitments by a charge to current earnings through noninterest expense. The reserve is calculated by applying historical loss rates and considering qualitative factors to unfunded commitments. The balance in the allowance for unfunded loan commitments was approximately $2.9 million at June 30, 2015 as compared to $2.3 million at December 31, 2014. The increase primarily relates to the Merger. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets.

Nonperforming assets consist of nonaccrual loans, nonaccrual TDRs and OREO. The following table summarizes nonperforming assets for the dates presented:

(dollars in thousands)	June 30, 2015			December 31, 2014			$ Change
Nonaccrual Loans
Commercial real estate	$	3,756		$	2,255		$	1,501
Commercial and industrial	917			1,266			(349		)
Commercial construction	2,503			105			2,398
Residential mortgage	1,400			1,877			(477		)
Home equity	1,616			1,497			119
Installment and other consumer	19			21			(2		)
Consumer construction	—			—			—
Total Nonaccrual Loans	10,211			7,021			3,190
Nonaccrual Troubled Debt Restructurings
Commercial real estate	3,553			2,180			1,373
Commercial and industrial	2,226			356			1,870
Commercial construction	1,969			1,869			100
Residential mortgage	609			459			150
Home equity	411			562			(151		)
Installment and other consumer	160			10			150
Total Nonaccrual Troubled Debt Restructurings	8,928			5,436			3,492
Total Nonaccrual Loans	19,139			12,457			6,682
OREO	750			166			584
Total Nonperforming Assets	$	19,889		$	12,623		$	7,266
Asset Quality Ratios:
Nonperforming loans as a percent of total loans	0.40		%	0.32		%
Nonperforming assets as a percent of total loans plus OREO	0.41		%	0.33		%

Our policy is to place loans in all categories in nonaccrual status when collection of interest or principal is doubtful, or generally when interest or principal payments are 90 days or more past due.

Nonperforming assets, or NPAs, increased by $7.3 million to $19.9 million at June 30, 2015 compared to $12.6 million at December 31, 2014. The increase in NPAs was primarily due to a $6.7 million increase in nonperforming loans and a $0.6 million increase in OREO acquired from the Merger. The increase in nonperforming loans was primarily due to the further

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

deterioration of five acquired commercial loans totaling $3.6 million and an originated CRE loan with one customer totaling $2.8 million.

Deposits

(dollars in thousands)	June 30, 2015		December 31, 2014		$ Change
Noninterest-bearing demand	$	1,182,124	$	1,083,919	$	98,205
Interest-bearing demand	669,351		333,015		336,336
Money market	412,253		309,245		103,008
Savings	1,093,057		1,027,095		65,962
Certificates of deposit	1,119,595		933,210		186,385
Brokered deposits	383,035		222,358		160,677
Total Deposits	$	4,859,415	$	3,908,842	$	950,573

Deposits are our primary source of funds. We believe that our deposit base is stable and that we have the ability to attract new deposits, mitigating any funding dependency on other more volatile sources. Total deposits at June 30, 2015 increased primarily due to the Merger which added $722.3 million in deposits.

Overall, our customer deposits, which exclude brokered deposits, increased by $789.9 million from December 31, 2014. This increase consisted of $657.2 million from the Merger and $132.7 million of organic growth. Brokered deposits consist of CDs, money market, and interest-bearing demand funds and are an additional source of funds utilized by ALCO as a way to diversify funding sources, as well as manage our funding costs and structure. The increase of $160.7 million of brokered deposits included $65.2 million from the Merger.

Borrowings

(dollars in thousands)	June 30, 2015		December 31, 2014		$ Change
Securities sold under repurchase agreements	$	46,235	$	30,605	$	15,630
Short-term borrowings	230,975		290,000		(59,025		)
Long-term borrowings	118,228		19,442		98,786
Junior subordinated debt securities	45,619		45,619		—
Total Borrowings	$	441,057	$	385,666	$	55,391

Borrowings are an additional source of funding for us. Total borrowings increased by $55.4 million from December 31, 2014. The increase in total borrowings was a result of a new variable rate long-term borrowing of $100.0 million during the second quarter offset by decreases in short-term borrowings of $59.0 million. The increase in borrowings was primarily due to funding needs to support our asset growth. On March 5, 2015, we paid off $8.5 million and on June 18, 2015, we paid off the remaining $5.0 million of the $13.5 million junior subordinated debt that we assumed in the Merger.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

Information pertaining to short-term borrowings is summarized in the tables below for the six and twelve month periods ended June 30, 2015 and December 31, 2014.

	Securities Sold Under Repurchase Agreements
(dollars in thousands)	June 30, 2015			December 31, 2014
Balance at the period end	$	46,235		$	30,605
Average balance during the period	42,542			28,372
Average interest rate during the period	0.01		%	0.01		%
Maximum month-end balance during the period	$	46,721		$	40,983
Average interest rate at the period end	0.01		%	0.01		%
	Short-Term Borrowings
(dollars in thousands)	June 30, 2015			December 31, 2014
Balance at the period end	$	230,975		$	290,000
Average balance during the period	274,993			164,811
Average interest rate during the period	0.28		%	0.31		%
Maximum month-end balance during the period	$	312,769		$	290,000
Average interest rate at the period end	0.28		%	0.30		%

Information pertaining to long-term borrowings is summarized in the tables below for the six and twelve month periods ended June 30, 2015 and December 31, 2014.

	Long-Term Borrowings
(dollars in thousands)	June 30, 2015			December 31, 2014
Balance at the period end	$	118,228		$	19,442
Average balance during the period	49,165			20,571
Average interest rate during the period	1.37		%	3.00		%
Maximum month-end balance during the period	$	118,432		$	21,616
Average interest rate at the period end	0.76		%	2.97		%
	Junior Subordinated Debt Securities
(dollars in thousands)	June 30, 2015			December 31, 2014
Balance at the period end	$	45,619		$	45,619
Average balance during the period	48,547			45,619
Average interest rate during the period	2.85		%	2.68		%
Maximum month-end balance during the period	$	50,619		$	45,619
Average interest rate at the period end	2.74		%	2.70		%

Liquidity and Capital Resources

Liquidity is defined as a financial institution’s ability to meet its cash and collateral obligations at a reasonable cost. This includes the ability to satisfy the financial needs of depositors who want to withdraw funds or of borrowers needing to access funds to meet their credit needs. In order to manage liquidity risk our Board of Directors has delegated authority to the ALCO for formulation, implementation and oversight of liquidity risk management for S&T. ALCO’s goal is to maintain adequate levels of liquidity at a reasonable cost to meet funding needs in both a normal operating environment and for potential liquidity stress events. ALCO monitors and manages liquidity through various ratios, reviewing cash flow projections, performing stress tests and by having a detailed contingency funding plan. ALCO policy guidelines define graduated risk tolerance levels. If our liquidity position moves to a level that has been defined as high risk, specific actions are required, such as increased monitoring or the development of an action plan to reduce the risk position.

Our primary funding and liquidity source is a stable customer deposit base. We believe S&T has the ability to retain existing and attract new deposits, mitigating any funding dependency on other more volatile sources. Refer to the Deposits Section of Item 2, MD&A, for additional discussion on deposits. Although deposits are the primary source of funds, we have identified various funding sources that can be used as part of our normal funding program when either a structure or cost efficiency has been identified. Additional funding sources available to S&T include borrowing availability at the FHLB of Pittsburgh, Federal Funds lines with other financial institutions, and access to the brokered deposit market.

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Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS - continued

An important component of S&T’s ability to effectively respond to potential liquidity stress events is maintaining a cushion of highly liquid assets. Highly liquid assets are those that can be converted to cash quickly, with little or no loss in value, to meet financial obligations. ALCO policy guidelines define a ratio of highly liquid assets to total assets by graduated risk tolerance levels of minimal, moderate and high. At June 30, 2015 S&T had $422.6 million in highly liquid assets, which consisted of $82.9 million in interest-bearing deposits with banks, $326.0 million in unpledged securities and $13.6 million in loans held for sale. The highly liquid assets to total assets resulted in an asset liquidity ratio of 6.9 percent at June 30, 2015. Also, at June 30, 2015, S&T had a remaining borrowing availability of $1.4 billion with the FHLB of Pittsburgh. Refer to Note 9 Borrowings, and the Borrowing section of Item 2, MD&A, for more details.

The following summarizes capital amounts and ratios for S&T and S&T Bank for the dates presented:

(dollars in thousands)	Adequately Capitalized		Well- Capitalized		June 30, 2015				December 31, 2014
					Amount		Ratio		Amount		Ratio
S&T Bancorp, Inc.
Tier 1 leverage	4.00	%	5.00	%	$	511,454	8.92	%	$	465,114	9.80	%
Common equity tier 1 to risk-weighted assets	4.50	%	6.50	%	491,543		9.59	%	445,114		11.81	%
Tier 1 capital to risk-weighted assets	6.00	%	8.00	%	511,454		9.97	%	465,114		12.34	%
Total capital to risk-weighted assets	8.00	%	10.00	%	588,736		11.48	%	537,935		14.27	%
S&T Bank
Tier 1 leverage	4.00	%	5.00	%	$	480,155	9.04	%	$	403,593	8.53	%
Common equity tier 1 to risk-weighted assets	4.50	%	6.50	%	480,155		9.40	%	403,593		10.76	%
Tier 1 capital to risk-weighted assets	6.00	%	8.00	%	480,155		9.40	%	403,593		10.76	%
Total capital to risk-weighted assets	8.00	%	10.00	%	556,875		10.90	%	475,538		12.68	%

When comparing June 30, 2015 to December 31, 2014, the capital ratios were impacted by the Merger and new regulatory requirements under Basel III. The Merger between S&T and Integrity closed on March 4, 2015. The new regulatory requirements were effective January 1, 2015 with a phase-in period ending January 1, 2019. The new regulatory requirements include a common equity tier 1 to risk-weighted assets ratio and increased the capital required for certain categories of assets. S&T and S&T Bank continue to be well-capitalized under the new regulatory guidelines.

In October 2012, we filed a shelf registration statement on Form S-3 under the Securities Act of 1933 as amended, with the SEC, for the issuance of up to $300 million of a variety of securities including debt and capital securities, preferred and common stock and warrants. We may use the proceeds from the sale of securities for general corporate purposes, which could include investments at the holding company level, investing in, or extending credit to subsidiaries, possible acquisitions and stock repurchases. As of June 30, 2015 we had not issued any securities pursuant to the shelf registration statement.

Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is defined as the degree to which changes in interest rates, foreign exchange rates, commodity prices or equity prices can adversely affect a financial institution’s earnings or capital. For most financial institutions, including S&T, market risk primarily reflects exposures to changes in interest rates. Interest rate fluctuations affect earnings by changing net interest income and other interest-sensitive income and expense levels. Interest rate changes affect capital by changing the net present value of a bank’s future cash flows, and the cash flows themselves, as rates change. Accepting this risk is a normal part of banking and can be an important source of profitability and shareholder value. However, excessive interest rate risk can threaten a bank’s earnings, capital, liquidity and solvency. Our sensitivity to changes in interest rate movements is continually monitored by ALCO. ALCO monitors and manages market risk through rate shock analyses, economic value of equity, or EVE, analysis and by performing stress tests in order to mitigate earnings and market value fluctuations due to changes in interest rates.

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Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK - continued

Rate shock analyses results are compared to a base case to provide an estimate of the impact that market rate changes may have on 12 months of pretax net interest income. The base case and rate shock analyses are performed on a static balance sheet. A static balance sheet is a no growth balance sheet in which all maturing and/or repricing cash flows are reinvested in the same product at the existing product spread. Rate shock analyses assume an immediate parallel shift in market interest rates and also include management assumptions regarding the impact of interest rate changes on non-maturity deposit products (noninterest-bearing demand, interest-bearing demand, money market and savings) and changes in the prepayment behavior of fixed rate loans and securities with optionality. S&T policy guidelines limit the change in pretax net interest income over a 12 month horizon using rate shocks of +/- 300 basis points. Policy guidelines define the percent change in pretax net interest income by graduated risk tolerance levels of minimal, moderate and high. We have temporarily suspended the -200 and -300 basis point rate shock analyses. Due to the low interest rate environment, we believe the impact to net interest income when evaluating the -200 and -300 basis point rate shock scenarios does not provide meaningful insight into our interest rate risk position.

In order to monitor interest rate risk beyond the 12 month time horizon of rate shocks, we also perform EVE analysis. EVE represents the present value of all asset cash flows minus the present value of all liability cash flows. EVE rate change results are compared to a base case to determine the impact that market rate changes may have on our EVE. As with rate shock analysis, EVE incorporates management assumptions regarding prepayment behavior of fixed rate loans and securities with optionality and the behavior and value of non-maturity deposit products. S&T policy guidelines limit the change in EVE given changes in rates of +/- 300 basis points. Policy guidelines define the percent change in EVE by graduated risk tolerance levels of minimal, moderate and high. We have also temporarily suspended the EVE -200 and -300 basis point scenarios due to the low interest rate environment.

The table below reflects the rate shock analyses and EVE analysis results. Both are in the minimal risk tolerance level.

	June 30, 2015				December 31, 2014
Change in Interest Rate (basis points)	% Change in Pretax Net Interest Income		% Change in EVE		% Change in Pretax Net Interest Income		% Change in EVE
+300	9.8		4.1		6.7		1.8
+200	5.8		5.1		4.1		3.9
+100	2.8		4.1		1.8		3.5
-100	(3.8	)	(11.5	)	(3.4	)	(12.3	)

The results from the rate shock analyses are consistent with having an asset sensitive balance sheet. Having an asset sensitive balance sheet means more assets than liabilities will reprice during the measured time frames. The implications of an asset sensitive balance sheet will differ depending upon the change in market interest rates. For example, with an asset sensitive balance sheet in a declining interest rate environment, more assets than liabilities will decrease in rate. This situation could result in a decrease in net interest income and operating income. Conversely, with an asset sensitive balance sheet in a rising interest rate environment, more assets than liabilities will increase in rate. This situation could result in an increase in net interest income and operating income. As measured by rate shock analyses, an increase in interest rates would have a positive impact on pretax net interest income.

The percent change in pretax net interest income increased for our rates up shock scenarios and decreased in the rates down shock scenario when comparing June 30, 2015 to December 31, 2014. This is mainly a result of an increase in our asset sensitive position when compared to December 2014. Our balance sheet became more asset sensitive mainly as a result of an increase in our variable rate loan portfolio.

When comparing the EVE results for June 30, 2015 to December 31, 2014 the percent change to EVE has improved in the rates up and the rates down shock scenario. The improvement is mainly attributed to an increase in our core deposits. The value of core deposits as low cost funding modestly improved our rates down EVE results and provided a larger benefit in our rates up scenarios.

In addition to rate shocks analysis and EVE analysis, we perform a market risk stress test at least annually. The market risk stress test includes sensitivity analyses and simulations. Sensitivity analyses are performed to help us identify which model assumptions cause the greatest impact on pretax net interest income. Sensitivity analyses may include changing prepayment behavior of fixed rate loans and securities with optionality and the impact of interest rate changes on non-maturity deposit products. Simulation analyses may include the potential impact of rate shocks other than the policy guidelines of +/- 300 basis points, yield curve shape changes, significant balance mix changes and various growth scenarios. Simulations indicate that an increase in rates, particularly if the yield curve steepens, will most likely result in an improvement in pretax net interest income. We realize that some of the benefit reflected in our scenarios may be offset by a change in the competitive environment and a change in product preference by our customers.

Item 4. CONTROLS AND PROCEDURES

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Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of S&T’s Chief Executive Officer, or CEO, and Chief Financial Officer, or CFO (its principal executive officer and principal financial officer, respectively), management has evaluated the effectiveness of the design and operation of S&T’s disclosure controls and procedures as of June 30, 2015. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, or the Exchange Act, is recorded, processed, summarized and reported within the time periods required by the Securities and Exchange Commission, or the SEC, and that such information is accumulated and communicated to S&T’s management, including our CEO and CFO, as appropriate, to allow timely decisions regarding required disclosure.

Based on and as of the date of such evaluation, our CEO and CFO concluded that the design and operation of our disclosure controls and procedures were effective in all material respects, as of the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

During the quarter ended June 30, 2015, there were no changes made to S&T’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that materially affected, or are reasonably likely to materially affect, S&T’s internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1. Legal Proceedings

None

Item 1A. Risk Factors

There have been no material changes to the risk factors that we have previously disclosed in Item 1A – “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2014, as filed with the SEC on February 20, 2015.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None

Item 3. Defaults Upon Senior Securities

None

Item 4. Mine Safety Disclosures

Not Applicable

Item 5. Other Information

None

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Item 6. Exhibits

10.1	Severance Agreement, by and between Todd D. Brice and S&T Bancorp, Inc. dated April 7, 2015, filed as Exhibit 10.1 to S&T Bancorp Inc.'s Current Report on Form 8-K filed on April 10, 2015 and incorporated herein by reference.
10.2	Severance Agreement, by and between Mark Kochvar and S&T Bancorp, Inc. dated April 7, 2015, filed as Exhibit 10.2 to S&T Bancorp Inc.'s Current Report on Form 8-K filed on April 10, 2015 and incorporated herein by reference.
10.3	Severance Agreement, by and between David G. Antolik and S&T Bancorp, Inc. dated April 7, 2015, filed as Exhibit 10.3 to S&T Bancorp Inc.'s Current Report on Form 8-K filed on April 10, 2015 and incorporated herein by reference.
10.4	Severance Agreement, by and between David P. Ruddock and S&T Bancorp, Inc. dated April 7, 2015, filed as Exhibit 10.4 to S&T Bancorp Inc.'s Current Report on Form 8-K filed on April 10, 2015 and incorporated herein by reference.
10.5	Severance Agreement, by and between Patrick J. Haberfield and S&T Bancorp, Inc. dated April 7, 2015, filed as Exhibit 10.5 to S&T Bancorp Inc.'s Current Report on Form 8-K filed on April 10, 2015 and incorporated herein by reference.
31.1	Rule 13a-14(a) Certification of the Chief Executive Officer.
31.2	Rule 13a-14(a) Certification of the Chief Financial Officer.
32	Rule 13a-14(b) Certification of the Chief Executive Officer and Chief Financial Officer.
101	The following financial information from the Registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 is formatted in eXtensible Business Reporting Language (XBRL): (i) Unaudited Consolidated Balance Sheet at June 30, 2015 and Audited Consolidated Balance Sheet at December 31, 2014, (ii) Unaudited Consolidated Statements of Comprehensive Income for the Three and Six Months ended June 30, 2015 and 2014, (iii) Unaudited Consolidated Statements of Changes in Shareholders’ Equity for the Six Months ended June 30, 2015 and 2014, (iv) Unaudited Consolidated Statements of Cash Flows for the Six Months ended June 30, 2015 and 2014 and (v) Notes to Unaudited Consolidated Financial Statements.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	S&T Bancorp, Inc. (Registrant)
Date: August 4, 2015	/s/ Mark Kochvar
	Mark Kochvar Senior Executive Vice President and Chief Financial Officer (Principal Financial Officer and Duly Authorized Signatory)

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, Todd D. Brice, certify that:

1. I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, Inc.;

2. Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information;

b) Any fraud, whether or not material that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 4, 2015

/s/ Todd D. Brice

Todd D. Brice, Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Mark Kochvar, certify that:

1. I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, Inc.;

2. Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation;

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information;

b) Any fraud, whether or not material that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 4, 2015

/s/ Mark Kochvar

Mark Kochvar, Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

AND CHIEF FINANCIAL OFFICER

SARBANES-OXLEY ACT SECTION 906

Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in connection with the S&T Bancorp, Inc. (the “Company”) Quarterly Report on Form 10-Q for the period ended June 30, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Todd D. Brice, Chief Executive Officer of the Company, and I, Mark Kochvar, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the dates and period covered by the report.

This certificate is being made for the exclusive purpose of compliance by the Chief Executive Officer and Chief Financial Officer of the Company with the requirements of Section 906 of the Sarbanes-Oxley Act of 2002, and may not be disclosed, distributed or used by any person or for any reason other than as specifically required by law.

Date: August 4, 2015

/s/ Todd D. Brice	/s/ Mark Kochvar
Todd D. Brice, Chief Executive Officer	Mark Kochvar, Chief Financial Officer

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Earnings Per Share - Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator for Earnings per Share-Basic:
Net income	$ 18,188	$ 14,720	$ 31,023	$ 28,753
Less: Income allocated to participating shares	79	29	123	64
Net Income Allocated to Shareholders	18,109	14,691	30,900	28,689
Numerator for Earnings per Share-Diluted:
Net income	18,188	14,720	31,023	28,753
Net Income Available to Shareholders	$ 18,188	$ 14,720	$ 31,023	$ 28,753
Denominators:
Weighted Average Shares Outstanding-Basic	34,652,895	29,684,300	32,951,936	29,672,611
Add: Potentially dilutive shares	28,283	16,894	36,359	27,559
Denominator for Treasury Stock Method-Diluted	34,681,178	29,701,194	32,988,295	29,700,170
Weighted Average Shares Outstanding-Basic	34,652,895	29,684,300	32,951,936	29,672,611
Add: Average participating shares outstanding	151,134	58,973	131,563	66,563
Denominator for Two-Class Method-Diluted	34,804,029	29,743,273	33,083,499	29,739,174
Earnings per share—basic (in dollars per share)	$ 0.52	$ 0.49	$ 0.94	$ 0.97
Earnings per share—diluted (in dollars per share)	0.52	$ 0.49	0.94	$ 0.97
Anti-dilutive warrants - exercise price (in USD per share)	$ 31.53		$ 31.53
Warrants [Member]
Denominators:
Anti-dilutive excluded from potentially dilutive shares	517,012	517,012	517,012	517,012
Stock Options [Member]
Denominators:
Anti-dilutive excluded from potentially dilutive shares	155,500	428,493	155,500	428,676
Restricted Stock [Member]
Denominators:
Anti-dilutive excluded from potentially dilutive shares	122,851	42,079	95,204	39,005

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Loans and Loans Held for Sale - Summary of Nonperforming Assets of Defaulted TDRs (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2014 USD ($) Contract	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2014 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Defaults	2	0	4	1
Recorded Investment | $	$ 119	$ 0	$ 307	$ 72
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults			1	1
Recorded Investment | $			$ 183	$ 72
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	2		3
Recorded Investment | $	$ 119		$ 124

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Securities Available-for-sale - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains	$ 11,594	$ 12,647
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses	(1,638)	(1,837)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses)	9,956	10,810
Income Tax expense/(benefit), Gross Unrealized Gains	4,058	4,426
Income Tax expense/(benefit), Gross Unrealized Losses	(573)	(643)
Income Tax expense/(benefit), Net Unrealized Gains/ (Losses)	3,485	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	7,536	8,221
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	(1,065)	(1,194)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/ (Losses)	$ 6,471	$ 7,027

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Commitments and Contingencies - Commitments and Letters of Credit (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Other Commitments [Line Items]
Commitments and letters of credit	$ 1,552,329	$ 1,232,212
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Commitments and letters of credit	1,453,491	1,158,628
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Commitments and letters of credit	$ 98,838	$ 73,584

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Loans and Loans Held for Sale - Summary of Nonperforming Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Nonperforming Assets
Nonaccrual loans	$ 10,211	$ 7,021
Nonaccrual TDRs	8,928	5,436
Total nonaccrual loans	19,139	12,457
OREO	750	166
Total Nonperforming Assets	$ 19,889	$ 12,623

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Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail) $ in Thousands	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	20	7
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 125,424	$ 59,329
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (1,233)	$ (381)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	5	13
Available-for-sale Securities, 12 Months or More, Fair Value	$ 39,643	$ 103,527
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ (405)	$ (1,456)
Available-for-sale, Securities, Number of Positions | security	25	20
Available-for-sale Securities, Fair Value, Total	$ 165,067	$ 162,856
Available-for-sale Securities, Unrealized Losses, Total	$ (1,638)	$ (1,837)
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	4	4
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 33,489	$ 39,745
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (215)	$ (207)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	4	8
Available-for-sale Securities, 12 Months or More, Fair Value	$ 30,033	$ 63,149
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ (212)	$ (871)
Available-for-sale, Securities, Number of Positions | security	8	12
Available-for-sale Securities, Fair Value, Total	$ 63,522	$ 102,894
Available-for-sale Securities, Unrealized Losses, Total	$ (427)	$ (1,078)
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	2	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 17,288	$ 9,323
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (132)	$ (148)
Available-for-sale, Securities, Number of Positions | security	2	1
Available-for-sale Securities, Fair Value, Total	$ 17,288	$ 9,323
Available-for-sale Securities, Unrealized Losses, Total	$ (132)	$ (148)
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	2
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 10,704
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (186)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security		1
Available-for-sale Securities, 12 Months or More, Fair Value		$ 8,982
Available-for-sale Securities, 12 Months or More, Unrealized Losses		$ (154)
Available-for-sale, Securities, Number of Positions | security	2	1
Available-for-sale Securities, Fair Value, Total	$ 10,704	$ 8,982
Available-for-sale Securities, Unrealized Losses, Total	$ (186)	$ (154)
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	2	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 20,976	$ 9,998
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (180)	$ (25)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	1	2
Available-for-sale Securities, 12 Months or More, Fair Value	$ 9,610	$ 20,640
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ (193)	$ (368)
Available-for-sale, Securities, Number of Positions | security	3	3
Available-for-sale Securities, Fair Value, Total	$ 30,586	$ 30,638
Available-for-sale Securities, Unrealized Losses, Total	$ (373)	$ (393)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	10	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 42,967	$ 263
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (520)	$ (1)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security		2
Available-for-sale Securities, 12 Months or More, Fair Value		$ 10,756
Available-for-sale Securities, 12 Months or More, Unrealized Losses		$ (63)
Available-for-sale, Securities, Number of Positions | security	10	3
Available-for-sale Securities, Fair Value, Total	$ 42,967	$ 11,019
Available-for-sale Securities, Unrealized Losses, Total	$ (520)	$ (64)

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Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	672		$	631		$	1,344		$	1,262
Interest cost on projected benefit obligation	1,100			1,106			2,200			2,212
Expected return on plan assets	(1,807		)	(1,735		)	(3,614		)	(3,470		)
Amortization of prior service (credit) cost	(35		)	(35		)	(70		)	(70		)
Recognized net actuarial loss	468			209			936			418
Net Periodic Pension Expense	$	398		$	176		$	796		$	352

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Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$ 672	$ 631	$ 1,344	$ 1,262
Interest cost on projected benefit obligation	1,100	1,106	2,200	2,212
Expected return on plan assets	(1,807)	(1,735)	(3,614)	(3,470)
Amortization of prior service (credit) cost	(35)	(35)	(70)	(70)
Recognized net actuarial loss	468	209	936	418
Net Periodic Pension Expense	$ 398	$ 176	$ 796	$ 352

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Allowance for Loan Losses - Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 3,639,300	$ 2,892,522
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 3,436,177	$ 2,780,315
Total percentage of recorded investment in commercial loan	94.40%	96.10%
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 119,855	$ 65,968
Total percentage of recorded investment in commercial loan	3.30%	2.30%
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 83,268	$ 46,239
Total percentage of recorded investment in commercial loan	2.30%	1.60%
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 2,054,935	$ 1,682,236
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 1,976,311	$ 1,635,132
Total percentage of recorded investment in commercial loan	96.20%	97.20%
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 33,328	$ 23,597
Total percentage of recorded investment in commercial loan	1.60%	1.40%
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 45,296	$ 23,507
Total percentage of recorded investment in commercial loan	2.20%	1.40%
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 1,239,382	$ 994,138
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 1,158,898	$ 948,663
Total percentage of recorded investment in commercial loan	93.50%	95.40%
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 60,251	$ 30,357
Total percentage of recorded investment in commercial loan	4.90%	3.10%
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 20,233	$ 15,118
Total percentage of recorded investment in commercial loan	1.60%	1.50%
Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 344,983	$ 216,148
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 300,968	$ 196,520
Total percentage of recorded investment in commercial loan	87.30%	90.90%
Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 26,276	$ 12,014
Total percentage of recorded investment in commercial loan	7.60%	5.60%
Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 17,739	$ 7,614
Total percentage of recorded investment in commercial loan	5.10%	3.50%

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Segments - Financial Information of Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	$ 52,611	$ 39,872	$ 96,526	$ 78,537
Interest expense	3,800	3,017	7,456	6,091
NET INTEREST INCOME	48,811	36,855	89,070	72,446
Provision for loan losses	2,059	(1,134)	3,266	(845)
Noninterest income	13,383	11,771	25,467	23,187
Noninterest Expense By Segment	33,634	29,043	65,877	56,821
Depreciation expense	1,299	825	2,329	1,645
Amortization of intangible assets	516	297	864	613
Provision for income taxes	6,498	4,875	11,178	8,646
Net Income	18,188	14,720	31,023	28,753
Operating Segments [Member] | Community Banking [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	52,598	39,845	96,483	78,475
Interest expense	4,056	3,415	7,944	6,897
NET INTEREST INCOME	48,542	36,430	88,539	71,578
Provision for loan losses	2,059	(1,134)	3,266	(845)
Noninterest income	8,869	7,522	16,406	14,375
Noninterest Expense By Segment	29,916	25,092	58,603	49,066
Depreciation expense	1,279	805	2,290	1,607
Amortization of intangible assets	495	274	822	566
Provision for income taxes	6,139	4,637	10,396	8,002
Net Income	17,523	14,278	29,568	27,557
Operating Segments [Member] | Insurance [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	1		1
NET INTEREST INCOME	1		1
Noninterest income	1,328	1,245	2,881	2,766
Noninterest Expense By Segment	1,053	1,044	2,190	2,199
Depreciation expense	14	13	26	25
Amortization of intangible assets	13	13	25	25
Provision for income taxes	88	61	224	181
Net Income	161	114	417	336
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	157	136	298	310
NET INTEREST INCOME	157	136	298	310
Noninterest income	2,917	2,828	5,833	5,764
Noninterest Expense By Segment	2,285	2,442	4,505	4,716
Depreciation expense	6	7	13	13
Amortization of intangible assets	8	10	17	22
Provision for income taxes	271	177	558	463
Net Income	504	328	1,038	860
Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	(145)	(109)	(256)	(248)
Interest expense	(256)	(398)	(488)	(806)
NET INTEREST INCOME	111	289	232	558
Noninterest income	269	176	347	282
Noninterest Expense By Segment	$ 380	$ 465	$ 579	$ 840

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Qualified Affordable Housing Projects (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investments in Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 16,800,000		$ 16,800,000		$ 18,600,000
Open commitments	0		0		$ 0
Amortization expense included in noninterest expense	900,000	$ 1,000,000	1,900,000	$ 2,000,000
Tax credits	$ 1,000,000	$ 1,100,000	$ 2,000,000	$ 2,200,000

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Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pre-Tax Amount
Change in unrealized (losses)/gains on securities available-for-sale		$ (5,872)	$ 5,401	$ (889)	$ 9,876
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	34	(40)	34	(41)
Adjustment to funded status of employee benefit plans		463	211	1,192	423
Other Comprehensive (Loss)/Income		(5,375)	5,572	337	10,258
Tax (Expense) Benefit
Change in unrealized (losses)/ gains on securities available-for-sale		2,056	(1,891)	311	(3,457)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	(12)	15	(12)	15
Adjustment to funded status of employee benefit plans		(162)	(74)	(324)	(148)
Other Comprehensive (Loss)/Income		1,882	(1,950)	(25)	(3,590)
Net of Tax Amount
Change in unrealized (losses)/ gains on securities available-for-sale		(3,816)	3,510	(578)	6,419
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	22	(25)	22	(26)
Adjustment to funded status of employee benefit plans		301	137	868	275
Other Comprehensive (Loss)/Income		$ (3,493)	$ 3,622	$ 312	$ 6,668

[1] Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at June 30, 2015 and December 31, 2014. Due to limited trading volume, we transferred marketable equity securities with a fair value of $0.2 million from Level 1 to Level 2 during the six month period ended June 30, 2015. There were no other transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.

	June 30, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Securities available-for-sale:
U.S. Treasury securities	$	—	$	15,018	$	—	$	15,018
Obligations of U.S. government corporations and agencies	—		270,112		—		270,112
Collateralized mortgage obligations of U.S. government corporations and agencies	—		139,577		—		139,577
Residential mortgage-backed securities of U.S. government corporations and agencies	—		43,419		—		43,419
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		49,676		—		49,676
Obligations of states and political subdivisions	—		139,947		—		139,947
Marketable equity securities	—		8,875		—		8,875
Total securities available-for-sale	—		666,624		—		666,624
Trading securities held in a Rabbi Trust	3,796		—		—		3,796
Total securities	3,796		666,624		—		670,420
Derivative financial assets:
Interest rate swaps	—		11,013		—		11,013
Interest rate lock commitments	—		366		—		366
Forward sale contracts	—		17		—		17
Total Assets	$	3,796	$	678,020	$	—	$	681,816
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	10,994	$	—	$	10,994
Total Liabilities	$	—	$	10,994	$	—	$	10,994

	December 31, 2014
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Securities available-for-sale:
U.S. Treasury securities	$	—	$	14,880	$	—	$	14,880
Obligations of U.S. government corporations and agencies	—		269,285		—		269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	—		118,006		—		118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	—		46,668		—		46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,673		—		39,673
Obligations of states and political subdivisions	—		142,702		—		142,702
Marketable equity securities	178		8,881		—		9,059
Total securities available-for-sale	178		640,095		—		640,273
Trading securities held in a Rabbi Trust	3,456		—		—		3,456
Total securities	3,634		640,095		—		643,729
Derivative financial assets:
Interest rate swaps	—		12,981		—		12,981
Interest rate lock commitments	—		235		—		235
Forward sale contracts	—		—		—		—
Total Assets	$	3,634	$	653,311	$	—	$	656,945
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	12,953	$	—	$	12,953
Forward sale contracts	—		57		—		57
Total Liabilities	$	—	$	13,010	$	—	$	13,010

Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy

The following table presents our assets that were measured at fair value on a nonrecurring basis by the fair value hierarchy level at June 30, 2015 and December 31, 2014. There were no liabilities measured at fair value on a nonrecurring basis during these periods.

	June 30, 2015								December 31, 2014
(dollars in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS(1)
Loans held for sale	$	—	$	—	$	2,900	$	2,900	$	—	$	—	$	—	$	—
Impaired loans	—		—		13,913		13,913		—		—		12,916		12,916
Other real estate owned	—		—		747		747		—		—		117		117
Mortgage servicing rights	—		—		721		721		—		—		1,176		1,176
Total Assets	$	—	$	—	$	18,281	$	18,281	$	—	$	—	$	14,209	$	14,209
(1)This table presents only the nonrecurring items that are recorded at fair value in our financial statements.

Carrying Values and Fair Values of Financial Instruments

The carrying values and fair values of our financial instruments at June 30, 2015 and December 31, 2014 are presented in the following tables:

	Carrying Value(1)		Fair Value Measurements at June 30, 2015
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	146,582	$	146,582	$	146,582	$	—	$	—
Securities available-for-sale	666,624		666,624		—		666,624		—
Loans held for sale	13,634		13,722		—		—		13,722
Portfolio loans, net of unearned income	4,798,498		4,774,871		—		—		4,774,871
Bank owned life insurance	79,314		79,314		—		79,314		—
FHLB and other restricted stock	23,553		23,553		—		—		23,553
Trading securities held in a Rabbi Trust	3,796		3,796		3,796		—		—
Mortgage servicing rights	2,974		3,137		—		—		3,137
Interest rate swaps	11,013		11,013		—		11,013		—
Interest rate lock commitments	366		366		—		366		—
Forward sale contracts	17		17		—		17		—
LIABILITIES
Deposits	$	4,859,415	$	4,865,521	$	—	$	—	$	4,865,521
Securities sold under repurchase agreements	46,235		46,235		—		—		46,235
Short-term borrowings	230,975		230,975		—		—		230,975
Long-term borrowings	118,228		119,148		—		—		119,148
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	10,994		10,994		—		10,994		—
(1) As reported in the Consolidated Balance Sheets

	Carrying Value(1)		Fair Value Measurements at December 31, 2014
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	109,580	$	109,580	$	109,580	$	—	$	—
Securities available-for-sale	640,273		640,273		178		640,095		—
Loans held for sale	2,970		2,991		—		—		2,991
Portfolio loans, net of unearned income	3,868,746		3,827,634		—		—		3,827,634
Bank owned life insurance	62,252		62,252		—		62,252		—
FHLB and other restricted stock	15,135		15,135		—		—		15,135
Trading securities held in a Rabbi Trust	3,456		3,456		3,456		—		—
Mortgage servicing rights	2,817		2,934		—		—		2,934
Interest rate swaps	12,981		12,981		—		12,981		—
Interest rate lock commitments	235		235		—		235		—
LIABILITIES
Deposits	$	3,908,842	$	3,910,342	$	—	$	—	$	3,910,342
Securities sold under repurchase agreements	30,605		30,605		—		—		30,605
Short-term borrowings	290,000		290,000		—		—		290,000
Long-term borrowings	19,442		20,462		—		—		20,462
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	12,953		12,953		—		12,953		—
Forward sale contracts	57		57		—		57		—
(1) As reported in the Consolidated Balance Sheets

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Loans and Loans Held for Sale - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2015 USD ($) SecurityLoan	Mar. 04, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Deferred Income	$ 14,000	$ 14,000		$ 2,100
Discount on loans related to purchase accounting fair value adjustments	$ 14,700	$ 14,700
Percentage of commercial loans in total portfolio loans	76.00%	76.00%		75.00%
Commercial Loans	$ 3,639,300	$ 3,639,300		$ 2,892,522
Concentration Risk, Product		no
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	7.00%	7.00%		7.00%
Minimum period of loan payment defaults following restructure for TDRs to be in default		90 days
Commercial Real Estate and Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 2,400,000	$ 2,400,000
Combined percentage of commercial real estate and commercial construction in total commercial loans	66.00%	66.00%		66.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	50.00%	50.00%		49.00%
Out Of State Exposure Of Combined Portfolio	6.30%	6.30%		8.00%
Percentage of total loans out-of-state excluding contiguous states	3.10%	3.10%		3.90%
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 344,983	$ 344,983		$ 216,148
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	4	4
Loans modified not considered to be troubled debt restructuring	$ 1,300	$ 1,300
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 2,054,935	$ 2,054,935		1,682,236
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	1	3
Loans modified not considered to be troubled debt restructuring	$ 800	$ 1,000
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	2	2
Loans modified not considered to be troubled debt restructuring	$ 200	$ 200
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 1,239,382	$ 1,239,382		$ 994,138
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	4	6
Loans modified not considered to be troubled debt restructuring	$ 5,500	$ 5,700
Integrity Bancshares, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Discount on loans related to purchase accounting fair value adjustments			$ 14,800
Integrity Bancshares, Inc. [Member] | Commercial Real Estate and Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 424,000	$ 424,000

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Fair Value Measurements - Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Loans held for sale	$ 2,900
Impaired loans	13,913	$ 12,916
Other Assets, Fair Value Disclosure	747	117
Mortgage servicing rights	721	1,176
Total Assets	18,281	14,209
Level 3 [Member]
ASSETS
Loans held for sale	2,900
Impaired loans	13,913	12,916
Other Assets, Fair Value Disclosure	747	117
Mortgage servicing rights	721	1,176
Total Assets	$ 18,281	$ 14,209

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Segments - Total Assets by Reportable Operating Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 6,133,728	$ 4,964,686
Operating Segments [Member] | Community Banking [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	6,121,771	4,954,728
Operating Segments [Member] | Insurance [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	8,232	7,468
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 3,725	$ 2,490

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Business Combinations - Consideration, Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			6 Months Ended
	Jun. 30, 2015	Mar. 04, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value of Liabilities Assumed
Goodwill	$ 291,204		$ 291,204	$ 175,820
Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Cash		$ 29,500	29,510
Common stock	142,469		142,469
Fair value of total consideration	171,979	172,000
Fair Value of Assets Acquired
Cash and cash equivalents	13,163		13,163
Securities and other investments	11,502		11,502
Loans	788,687	788,700	788,687
Bank owned life insurance	15,974		15,974
Premises and equipment	10,855		10,855
Core deposit intangible	5,713		5,713
Other assets	19,555		19,555
Total Assets Acquired	865,449		865,449
Fair Value of Liabilities Assumed
Deposits	722,308		722,308
Borrowings	82,286		82,286
Other liabilities	4,259		4,259
Total Liabilities Assumed	808,853		808,853
Total Fair Value of Identifiable Net Assets	56,596		56,596
Goodwill	$ 115,383	$ 115,400	$ 115,383

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Loans and Loans Held for Sale - Restructured Loans for Periods Presented (Detail) $ in Thousands	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2015 USD ($) SecurityLoan		Jun. 30, 2014 USD ($) SecurityLoan		Jun. 30, 2015 USD ($) SecurityLoan		Jun. 30, 2014 USD ($) SecurityLoan		Dec. 31, 2014 USD ($)
Financing Receivable, Modifications [Line Items]
Threshold period of satisfactory performance for TDR to be restored to accruing status					6 months
Restructured loans	$ 796	[1]	$ 229	[1]	$ 5,381	[2]	$ 2,019	[1]
Number of TDRs returned to accruing status | SecurityLoan	6		0		6		0
TDRs returned to accruing status	$ 300				$ 300
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	7.00%				7.00%				7.00%
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					$ 32,559				$ 36,983
Performing Financial Instruments [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					13,045				16,939
Performing Financial Instruments [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					7,899				8,074
Performing Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					5,655				5,736
Performing Financial Instruments [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					2,622				2,839
Performing Financial Instruments [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,302				3,342
Performing Financial Instruments [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					36				53
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					8,928				5,436
Nonperforming Financial Instruments [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,553				2,180
Nonperforming Financial Instruments [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					2,226				356
Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					1,969				1,869
Nonperforming Financial Instruments [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					609				459
Nonperforming Financial Instruments [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					411				562
Nonperforming Financial Instruments [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					160				10
Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					41,487				42,419
Financing Receivable [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					16,598				19,119
Financing Receivable [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					10,125				8,430
Financing Receivable [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					7,624				7,605
Financing Receivable [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,231				3,298
Financing Receivable [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,713				3,904
Financing Receivable [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					$ 196				$ 63

[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

[2] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

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Borrowings - Additional Information (Detail) - USD ($)			6 Months Ended
	Jun. 18, 2015	Mar. 05, 2015	Jun. 30, 2015	Jun. 30, 2014	Mar. 04, 2015	Dec. 31, 2014
Long Term And Short Term Debt [Line Items]
Total long-term debt outstanding at a fixed rate			$ 15,000,000
Total long-term debt outstanding at a variable rate			148,800,000
Capital lease			200,000
Repayment of junior subordinated debt			13,500,000	$ 0
Total borrowings			349,000,000			$ 309,300,000
Short-term borrowings			231,000,000
Long-term borrowings			118,000,000
Federal Home Loan Bank Advances [Member]
Long Term And Short Term Debt [Line Items]
Maximum borrowing capacity			1,900,000,000.0
Remaining borrowing capacity			1,400,000,000
Borrowing capacity utilized			500,000,000
Letter of credit to collateralize public funds			168,500,000
Junior Subordinated Debt [Member]
Long Term And Short Term Debt [Line Items]
Repayment of junior subordinated debt	$ 5,000,000	$ 8,500,000
Borrowings					$ 13,500,000
Mortgage Backed Securities [Member]
Long Term And Short Term Debt [Line Items]
Mortgage backed securities pledged as collateral			$ 50,500,000			$ 35,600,000

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Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 48,106	$ 46,616	$ 47,911	$ 46,255
Charge-offs	(1,755)	(3,746)	(3,205)	(4,721)
Recoveries	404	4,844	842	5,891
Net (Charge-offs)/ Recoveries	(1,351)	1,098	(2,363)	1,170
Provision for loan losses	2,059	(1,134)	3,266	(845)
Balance at End of Period	48,814	46,580	48,814	46,580
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	19,071	19,880	20,164	18,921
Charge-offs	(310)	(1,737)	(376)	(2,004)
Recoveries	73	1,294	176	1,834
Net (Charge-offs)/ Recoveries	(237)	(443)	(200)	(170)
Provision for loan losses	184	1,296	(946)	1,982
Balance at End of Period	19,018	20,733	19,018	20,733
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,711	13,979	13,668	14,433
Charge-offs	(992)	(743)	(1,698)	(1,033)
Recoveries	89	2,936	203	3,249
Net (Charge-offs)/ Recoveries	(903)	2,193	(1,495)	2,216
Provision for loan losses	500	(3,168)	1,135	(3,645)
Balance at End of Period	13,308	13,004	13,308	13,004
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,869	5,183	6,093	5,374
Charge-offs		(664)		(692)
Recoveries	1	324	2	375
Net (Charge-offs)/ Recoveries	1	(340)	2	(317)
Provision for loan losses	801	(84)	1,576	(298)
Balance at End of Period	7,671	4,759	7,671	4,759
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,723	6,408	6,333	6,362
Charge-offs	(177)	(425)	(552)	(547)
Recoveries	112	164	248	223
Net (Charge-offs)/ Recoveries	(65)	(261)	(304)	(324)
Provision for loan losses	369	558	998	667
Balance at End of Period	7,027	6,705	7,027	6,705
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,732	1,166	1,653	1,165
Charge-offs	(276)	(177)	(579)	(445)
Recoveries	129	126	213	210
Net (Charge-offs)/ Recoveries	(147)	(51)	(366)	(235)
Provision for loan losses	205	264	503	449
Balance at End of Period	$ 1,790	$ 1,379	$ 1,790	$ 1,379

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Securities Available-for-Sale - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of debt securities on which unrealized losses were primarily attributable to changes in interest | security	25
Carrying values of securities	$ 326,300,000	$ 289,100,000
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses reclassified out of accumulated other comprehensive income into earnings	$ 0

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Business Combinations

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Business Combinations

On March 4, 2015, we completed the acquisition of 100 percent of the voting shares of Integrity Bancshares, Inc., or Integrity, located in Camp Hill, Pennsylvania, in a tax-free reorganization transaction structured as a merger of Integrity with and into S&T, with S&T being the surviving entity. As a result of the Integrity merger, or the Merger, Integrity Bank, the wholly owned subsidiary bank of Integrity, became a separate wholly owned subsidiary bank of S&T. The merger of Integrity Bank into S&T Bank, with S&T Bank surviving the merger, and related system conversion occurred on May 8, 2015.

Integrity shareholders were entitled to elect to receive for each share of Integrity common stock either $52.50 in cash or 2.0627 shares of S&T common stock subject to allocation and proration procedures in the merger agreement. The total purchase price was approximately $172.0 million which included $29.5 million of cash and 4,933,115 S&T common shares at a fair value of $28.88 per share. The fair value of $28.88 per share of S&T common stock was based on the March 4, 2015 closing price.

The Merger was accounted for under the acquisition method of accounting and our consolidated financial statements include all Integrity Bank transactions from March 4, 2015, until it was merged into S&T Bank on May 8, 2015. The assets acquired and liabilities assumed were recorded at their respective fair values and represent management’s estimates based on available information. During the three months ended June 30, 2015, an additional $0.6 million of purchase accounting adjustments were recognized that increased goodwill. The change to goodwill primarily related to a fair value adjustment made on land acquired in the Merger where we own a branch office.

Goodwill of $115.4 million was calculated as the excess of the consideration exchanged over the fair value of the identifiable net assets acquired. The goodwill arising from the Merger consists largely of the synergies and economies of scale expected from combining the operations of S&T and Integrity. All of the goodwill was assigned to our Community Banking segment. The goodwill recognized will not be deductible for tax purposes.

The following table summarizes total consideration, assets acquired and liabilities assumed as of June 30, 2015:

(dollars in thousands)
Consideration Paid
Cash	$	29,510
Common stock	142,469
Fair Value of Total Consideration	$	171,979
Fair Value of Assets Acquired
Cash and cash equivalents	$	13,163
Securities and other investments	11,502
Loans	788,687
Bank owned life insurance	15,974
Premises and equipment	10,855
Core deposit intangible	5,713
Other assets	19,555
Total Assets Acquired	865,449
Fair Value of Liabilities Assumed
Deposits	722,308
Borrowings	82,286
Other liabilities	4,259
Total Liabilities Assumed	808,853
Total Fair Value of Identifiable Net Assets	56,596
Goodwill	$	115,383

Loans acquired in the Merger were recorded at fair value with no carryover of the related allowance for loan losses. Determining the fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Loans acquired with evidence of credit quality deterioration were evaluated and not considered to be significant. The fair value of the loans acquired was $788.7 million net of a $14.8 million discount. The discount may be accreted to interest income over the remaining contractual life of the loans. Acquired loans included $331.6 million of commercial real estate, or CRE, $184.2 million of commercial and industrial, or C&I, $92.4 million of commercial construction, $116.9 million of residential mortgage, $25.6 million of home equity, $36.1 million of installment and other consumer and $1.9 million of consumer construction.

Direct costs related to the Merger were expensed as incurred. During the six months ended June 30, 2015, we recognized $3.2 million of merger related expenses, including $1.3 million for data processing contract termination and system conversion costs, $1.2 million in legal and professional expenses, $0.4 million in severance payments and $0.3 million in other expenses.

The following table presents unaudited pro forma financial information which combines the historical consolidated statements of income of S&T and Integrity to give effect to the Merger as if it had occurred on January 1, 2014, for the periods presented.

	Unaudited Pro Forma Information
	Three Months Ended June 30,				Six Months Ended June 30,
(dollars in thousands, except per share data)	2015		2014		2015		2014
Total revenue(1)	$	60,307	$	57,921	$	118,992	$	115,045
Net income (2)	$	18,816	$	17,765	$	32,728	$	33,697
Earnings per common share: (2)
Basic	$	0.54	$	0.51	$	0.95	$	0.97
Diluted	$	0.54	$	0.51	$	0.94	$	0.97

⁽¹⁾Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale.

⁽²⁾Excludes merger expenses

Pro forma adjustments include intangible amortization expense, net amortization or accretion of valuation amounts and income tax expense. The pro forma results are not indicative of the results of operations that would have occurred had the Merger taken place at the beginning of the periods presented nor are they intended to be indicative of results that may occur in the future.

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Allowance for Loan Losses - Summary of Allowance for Loan Losses and Recorded Investments (Detail) - USD ($)	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 608,000		$ 54,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	48,206,000		47,857,000
Total Allowance for Loan Losses	48,814,000	$ 48,106,000	47,911,000	$ 46,580,000	$ 46,616,000	$ 46,255,000
Portfolio Loans, Individually Evaluated for Impairment	45,855,000		43,977,000
Portfolio Loans, Collectively Evaluated for Impairment	4,752,643,000		3,824,769,000
Total Portfolio Loans	4,798,498,000		3,868,746,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	567,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	18,451,000		20,164,000
Total Allowance for Loan Losses	19,018,000	19,071,000	20,164,000	20,733,000	19,880,000	18,921,000
Portfolio Loans, Individually Evaluated for Impairment	19,297,000		19,890,000
Portfolio Loans, Collectively Evaluated for Impairment	2,035,638,000		1,662,346,000
Total Portfolio Loans	2,054,935,000		1,682,236,000
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,308,000		13,668,000
Total Allowance for Loan Losses	13,308,000	13,711,000	13,668,000	13,004,000	13,979,000	14,433,000
Portfolio Loans, Individually Evaluated for Impairment	10,125,000		9,218,000
Portfolio Loans, Collectively Evaluated for Impairment	1,229,257,000		984,920,000
Total Portfolio Loans	1,239,382,000		994,138,000
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,671,000		6,093,000
Total Allowance for Loan Losses	7,671,000	6,869,000	6,093,000	4,759,000	5,183,000	5,374,000
Portfolio Loans, Individually Evaluated for Impairment	9,293,000		7,605,000
Portfolio Loans, Collectively Evaluated for Impairment	335,690,000		208,543,000
Total Portfolio Loans	344,983,000		216,148,000
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	37,000		43,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	6,990,000		6,290,000
Total Allowance for Loan Losses	7,027,000	6,723,000	6,333,000	6,705,000	6,408,000	6,362,000
Portfolio Loans, Individually Evaluated for Impairment	6,944,000		7,202,000
Portfolio Loans, Collectively Evaluated for Impairment	1,057,817,000		903,455,000
Total Portfolio Loans	1,064,761,000		910,657,000
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	4,000		11,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,786,000		1,642,000
Total Allowance for Loan Losses	1,790,000	$ 1,732,000	1,653,000	$ 1,379,000	$ 1,166,000	$ 1,165,000
Portfolio Loans, Individually Evaluated for Impairment	196,000		62,000
Portfolio Loans, Collectively Evaluated for Impairment	94,241,000		65,505,000
Total Portfolio Loans	94,437,000		$ 65,567,000
Fair Value Measurements [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses on acquired loans	$ 0

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Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
ASSETS
Securities available-for-sale		$ 666,624	$ 640,273
FHLB and other restricted stock		23,553	15,135
LIABILITIES
Junior subordinated debt securities		45,619	45,619
Carrying Value [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits	[1]	146,582	109,580
Securities available-for-sale	[1]	666,624	640,273
Loans held for sale	[1]	13,634	2,970
Portfolio loans, net of unearned income	[1]	4,798,498	3,868,746
Bank owned life insurance	[1]	79,314	62,252
FHLB and other restricted stock	[1]	23,553	15,135
Trading securities held in a Rabbi Trust	[1]	3,796	3,456
Mortgage servicing rights	[1]	2,974	2,817
LIABILITIES
Deposits	[1]	4,859,415	3,908,842
Securities sold under repurchase agreements	[1]	46,235	30,605
Short-term borrowings	[1]	230,975	290,000
Long-term borrowings	[1]	118,228	19,442
Junior subordinated debt securities	[1]	45,619	45,619
Carrying Value [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets	[1]	11,013	12,981
LIABILITIES
Derivative financial liabilities	[1]	10,994	12,953
Carrying Value [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets	[1]	366	235
Carrying Value [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets		17
LIABILITIES
Derivative financial liabilities	[1]		57
Fair Value Measurements [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		146,582	109,580
Securities available-for-sale		666,624	640,273
Loans held for sale		13,722	2,991
Portfolio loans, net of unearned income		4,774,871	3,827,634
Bank owned life insurance		79,314	62,252
FHLB and other restricted stock		23,553	15,135
Trading securities held in a Rabbi Trust		3,796	3,456
Mortgage servicing rights		3,137	2,934
LIABILITIES
Deposits		4,865,521	3,910,342
Securities sold under repurchase agreements		46,235	30,605
Short-term borrowings		230,975	290,000
Long-term borrowings		119,148	20,462
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements [Member] | Level 1 [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		146,582	109,580
Securities available-for-sale		0	178
Loans held for sale		0	0
Portfolio loans, net of unearned income		0	0
Bank owned life insurance		0	0
FHLB and other restricted stock		0	0
Trading securities held in a Rabbi Trust		3,796	3,456
Mortgage servicing rights		0	0
LIABILITIES
Deposits		0	0
Securities sold under repurchase agreements		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Junior subordinated debt securities		0	0
Fair Value Measurements [Member] | Level 2 [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities available-for-sale		666,624	640,095
Loans held for sale		0	0
Portfolio loans, net of unearned income		0	0
Bank owned life insurance		79,314	62,252
FHLB and other restricted stock		0	0
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		0	0
LIABILITIES
Deposits		0	0
Securities sold under repurchase agreements		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Junior subordinated debt securities		0	0
Fair Value Measurements [Member] | Level 3 [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities available-for-sale		0	0
Loans held for sale		13,722	2,991
Portfolio loans, net of unearned income		4,774,871	3,827,634
Bank owned life insurance		0	0
FHLB and other restricted stock		23,553	15,135
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		3,137	2,934
LIABILITIES
Deposits		4,865,521	3,910,342
Securities sold under repurchase agreements		46,235	30,605
Short-term borrowings		230,975	290,000
Long-term borrowings		119,148	20,462
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets		11,013	12,981
LIABILITIES
Derivative financial liabilities		10,994	12,953
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 1 [Member]
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 2 [Member]
ASSETS
Derivative financial assets		11,013	12,981
LIABILITIES
Derivative financial liabilities		10,994	12,953
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 3 [Member]
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets		366	235
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 1 [Member]
ASSETS
Derivative financial assets		0	0
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 2 [Member]
ASSETS
Derivative financial assets		366	235
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 3 [Member]
ASSETS
Derivative financial assets		0	0
Fair Value Measurements [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets		17
LIABILITIES
Derivative financial liabilities			57
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 1 [Member]
ASSETS
Derivative financial assets		0
LIABILITIES
Derivative financial liabilities			0
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 2 [Member]
ASSETS
Derivative financial assets		17
LIABILITIES
Derivative financial liabilities			57
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 3 [Member]
ASSETS
Derivative financial assets		$ 0
LIABILITIES
Derivative financial liabilities			$ 0

[1] As reported in the Consolidated Balance Sheets.

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Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Value of Derivative Assets and Derivative Liabilities

The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:

	Derivatives (included in Other Assets)				Derivatives (included in Other Liabilities)
(dollars in thousands)	June 30, 2015		December 31, 2014		June 30, 2015		December 31, 2014
Derivatives not Designated as Hedging Instruments:
Interest Rate Swap Contracts- Commercial Loans
Fair value	$	11,013	$	12,981	$	10,994	$	12,953
Notional amount	233,777		245,152		233,777		245,152
Collateral posted	—		—		12,489		12,059
Interest Rate Lock Commitments- Mortgage Loans
Fair value	366		235		—		—
Notional amount	14,034		8,822		—		—
Forward Sale Contracts- Mortgage Loans
Fair value	17		—		—		57
Notional amount	$	13,812	$	—	$	—	$	7,789

Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities

The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	June 30, 2015			December 31, 2014			June 30, 2015			December 31, 2014
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	11,030		$	13,203		$	11,011		$	13,175
Gross amounts offset	(17		)	(222		)	(17		)	(222		)
Net amounts presented in the Consolidated Balance Sheets	11,013			12,981			10,994			12,953
Gross amounts not offset(1)	—			—			(12,489		)	(12,059		)
Net Amount	$	11,013		$	12,981		$	(1,495	)	$	894

⁽¹⁾ Amounts represent posted collateral.

Amount of Gain or Loss Recognized in Income on Derivatives

The following table indicates the gain or loss recognized in income on derivatives for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Derivatives not Designated as Hedging Instruments
Interest rate swap contracts—commercial loans	$	(21	)	$	(11	)	$	(8	)	$	(19	)
Interest rate lock commitments—mortgage loans	(8		)	199			128			207
Forward sale contracts—mortgage loans	92			(64		)	74			(93		)
Total Derivatives Gain (Loss)	$	63		$	124		$	194		$	95

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Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Age Analysis of Past Due Loans Segregated by Class of Loans

The following tables present the age analysis of past due loans segregated by class of loans as of June 30, 2015 and December 31, 2014:

	June 30, 2015
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days Past Due(1)		Nonaccrual		Total Past Due		Total Loans
Commercial real estate	$	2,032,731	$	9,656	$	3,518	$	1,721	$	7,309	$	22,204	$	2,054,935
Commercial and industrial	1,231,221		2,875		2,143		—		3,143		8,161		1,239,382
Commercial construction	333,897		4,474		—		2,140		4,472		11,086		344,983
Residential mortgage	593,043		1,732		1,770		947		2,010		6,459		599,502
Home equity	453,279		1,971		430		107		2,026		4,534		457,813
Installment and other consumer	93,223		261		774		—		179		1,214		94,437
Consumer construction	7,446		—		—		—		—		—		7,446
Loans held for sale	13,634		—		—		—		—		—		13,634
Totals	$	4,758,474	$	20,969	$	8,635	$	4,915	$	19,139	$	53,658	$	4,812,132
(1)Represents acquired loans that were recorded at fair value at the acquisition date.

	December 31, 2014
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days Past Due		Nonaccrual		Total Past Due		Total Loans
Commercial real estate	$	1,674,930	$	2,548	$	323	$	—	$	4,435	$	7,306	$	1,682,236
Commercial and industrial	991,136		1,227		153		—		1,622		3,002		994,138
Commercial construction	214,174		—		—		—		1,974		1,974		216,148
Residential mortgage	485,465		565		1,220		—		2,336		4,121		489,586
Home equity	414,303		1,756		445		—		2,059		4,260		418,563
Installment and other consumer	65,111		352		73		—		31		456		65,567
Consumer construction	2,508		—		—		—		—		—		2,508
Loans held for sale	2,970		—		—		—		—		—		2,970
Totals	$	3,850,597	$	6,448	$	2,214	$	—	$	12,457	$	21,119	$	3,871,716

Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	June 30, 2015
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	1,976,311	96.2	%	$	1,158,898	93.5	%	$	300,968	87.3	%	$	3,436,177	94.4	%
Special mention	33,328		1.6	%	60,251		4.9	%	26,276		7.6	%	119,855		3.3	%
Substandard	45,296		2.2	%	20,233		1.6	%	17,739		5.1	%	83,268		2.3	%
Total	$	2,054,935	100	%	$	1,239,382	100.0	%	$	344,983	100.0	%	$	3,639,300	100.0	%
	December 31, 2014
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	1,635,132	97.2	%	$	948,663	95.4	%	$	196,520	90.9	%	$	2,780,315	96.1	%
Special mention	23,597		1.4	%	30,357		3.1	%	12,014		5.6	%	65,968		2.3	%
Substandard	23,507		1.4	%	15,118		1.5	%	7,614		3.5	%	46,239		1.6	%
Total	$	1,682,236	100.0	%	$	994,138	100.0	%	$	216,148	100.0	%	$	2,892,522	100.0	%

Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	June 30, 2015
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	597,492	99.7	%	$	455,787	99.6	%	$	94,258	99.8	%	$	7,446	100.0	%	$	1,154,983	99.6	%
Nonperforming	2,010		0.3	%	2,026		0.4	%	179		0.2	%	—		—	%	4,215		0.4	%
Total	$	599,502	100.0	%	$	457,813	100.0	%	$	94,437	100.0	%	$	7,446	100.0	%	$	1,159,198	100.0	%
	December 31, 2014
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	487,250	99.5	%	$	416,504	99.5	%	$	65,536	99.9	%	$	2,508	100.0	%	$	971,798	99.5	%
Nonperforming	2,336		0.5	%	2,059		0.5	%	31		0.1	%	—		—	%	4,426		0.5	%
Total	$	489,586	100.0	%	$	418,563	100.0	%	$	65,567	100.0	%	$	2,508	100.0	%	$	976,224	100.0	%

Investments in Loans Considered to be Impaired and Related Information on Impaired Loans

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:

	Three Months Ended
	June 30, 2015				June 30, 2014
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	$	19,733	$	158	$	21,382	$	159
Commercial and industrial	10,782		84		9,317		57
Commercial construction	8,119		81		8,279		57
Consumer real estate	6,891		91		7,166		100
Other consumer	126		4		109		1
Total without a Related Allowance Recorded	45,651		418		46,253		374
With a related allowance recorded:
Commercial real estate	420		—		—		—
Commercial and industrial	—		—		—		—
Commercial construction	—		—		—		—
Consumer real estate	121		2		48		1
Other consumer	4		—		22		—
Total with a Related Allowance Recorded	545		2		70		1
Total:
Commercial real estate	20,153		158		21,382		159
Commercial and industrial	10,782		84		9,317		57
Commercial construction	8,119		81		8,279		57
Consumer real estate	7,012		93		7,214		101
Other consumer	130		4		131		1
Total	$	46,196	$	420	$	46,323	$	375

	Six Months Ended
	June 30, 2015				June 30, 2014
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	$	20,455	$	322	$	21,980	$	329
Commercial and industrial	11,162		146		9,066		114
Commercial construction	6,628		134		8,301		114
Consumer real estate	6,943		186		7,260		203
Other consumer	86		4		112		2
Total without a Related Allowance Recorded	45,274		792		46,719		762
With a related allowance recorded:
Commercial real estate	$	211	$	—	$	—	$	—
Commercial and industrial	—		—		—		—
Commercial construction	—		—		—		—
Consumer real estate	122		3		50		2
Other consumer	4		—		23		1
Total with a Related Allowance Recorded	337		3		73		3
Total:
Commercial real estate	20,666		322		21,980		329
Commercial and industrial	11,162		146		9,066		114
Commercial construction	6,628		134		8,301		114
Consumer real estate	7,065		189		7,310		205
Other consumer	90		4		135		3
Total	$	45,611	$	795	$	46,792	$	765

The following tables summarize investments in loans considered to be impaired and the related information on those impaired loans as of the dates presented:

	June 30, 2015						December 31, 2014
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
Without a related allowance recorded:
Commercial real estate	$	18,548	$	25,698	$	—	$	19,890	$	25,262	$	—
Commercial and industrial	10,125		11,877		—		9,218		9,449		—
Commercial construction	9,293		12,983		—		7,605		11,293		—
Consumer real estate	6,824		7,527		—		7,159		7,733		—
Other consumer	192		197		—		42		48		—
Total without a Related Allowance Recorded	44,982		58,282		—		43,914		53,785		—
With a related allowance recorded:
Commercial real estate	749		749		567		—		—		—
Commercial and industrial	—		—		—		—		—		—
Commercial construction	—		—		—		—		—		—
Consumer real estate	120		120		37		43		43		43
Other consumer	4		4		4		20		20		11
Total with a Related Allowance Recorded	873		873		608		63		63		54
Total:
Commercial real estate	19,297		26,447		567		19,890		25,262		—
Commercial and industrial	10,125		11,877		—		9,218		9,449		—
Commercial construction	9,293		12,983		—		7,605		11,293		—
Consumer real estate	6,944		7,647		37		7,202		7,776		43
Other consumer	196		201		4		62		68		11
Total	$	45,855	$	59,155	$	608	$	43,977	$	53,848	$	54

Summary of Allowance for Loan Losses

The following tables detail activity in the ALL for the periods presented:

	Three Months Ended June 30, 2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,071		$	13,711		$	6,869		$	6,723		$	1,732		$	48,106
Charge-offs	(310		)	(992		)	—			(177		)	(276		)	(1,755		)
Recoveries	73			89			1			112			129			404
Net (Charge-offs)/ Recoveries	(237		)	(903		)	1			(65		)	(147		)	(1,351		)
Provision for loan losses	184			500			801			369			205			2,059
Balance at End of Period	$	19,018		$	13,308		$	7,671		$	7,027		$	1,790		$	48,814
	Three Months Ended June 30, 2014
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,880		$	13,979		$	5,183		$	6,408		$	1,166		$	46,616
Charge-offs	(1,737		)	(743		)	(664		)	(425		)	(177		)	(3,746		)
Recoveries	1,294			2,936			324			164			126			4,844
Net (Charge-offs)/ Recoveries	(443		)	2,193			(340		)	(261		)	(51		)	1,098
Provision for loan losses	1,296			(3,168		)	(84		)	558			264			(1,134		)
Balance at End of Period	$	20,733		$	13,004		$	4,759		$	6,705		$	1,379		$	46,580
	Six Months Ended June 30, 2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	20,164		$	13,668		$	6,093		$	6,333		$	1,653		$	47,911
Charge-offs	(376		)	(1,698		)	—			(552		)	(579		)	(3,205		)
Recoveries	176			203			2			248			213			842
Net (Charge-offs)/Recoveries	(200		)	(1,495		)	2			(304		)	(366		)	(2,363		)
Provision for loan losses	(946		)	1,135			1,576			998			503			3,266
Balance at End of Period	$	19,018		$	13,308		$	7,671		$	7,027		$	1,790		$	48,814
	Six Months Ended June 30, 2014
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	18,921		$	14,433		$	5,374		$	6,362		$	1,165		$	46,255
Charge-offs	(2,004		)	(1,033		)	(692		)	(547		)	(445		)	(4,721		)
Recoveries	1,834			3,249			375			223			210			5,891
Net (Charge-offs)/Recoveries	(170		)	2,216			(317		)	(324		)	(235		)	1,170
Provision for loan losses	1,982			(3,645		)	(298		)	667			449			(845		)
Balance at End of Period	$	20,733		$	13,004		$	4,759		$	6,705		$	1,379		$	46,580

Summary of Allowance for Loan Losses and Recorded Investments

The following tables present the ALL and recorded investments in loans by category as of the periods presented:

	June 30, 2015
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total(1)
Commercial real estate	$	567	$	18,451	$	19,018	$	19,297	$	2,035,638	$	2,054,935
Commercial and industrial	—		13,308		13,308		10,125		1,229,257		1,239,382
Commercial construction	—		7,671		7,671		9,293		335,690		344,983
Consumer real estate	37		6,990		7,027		6,944		1,057,817		1,064,761
Other consumer	4		1,786		1,790		196		94,241		94,437
Total	$	608	$	48,206	$	48,814	$	45,855	$	4,752,643	$	4,798,498
(1)Includes acquired loans.
	December 31, 2014
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total(1)
Commercial real estate	$	—	$	20,164	$	20,164	$	19,890	$	1,662,346	$	1,682,236
Commercial and industrial	—		13,668		13,668		9,218		984,920		994,138
Commercial construction	—		6,093		6,093		7,605		208,543		216,148
Consumer real estate	43		6,290		6,333		7,202		903,455		910,657
Other consumer	11		1,642		1,653		62		65,505		65,567
Total	$	54	$	47,857	$	47,911	$	43,977	$	3,824,769	$	3,868,746
(1)Includes acquired loans.

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Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	$ 4,758,474	$ 3,850,597
Total nonaccrual loans	19,139	12,457
Total past due	53,658	21,119
Total Loans	4,812,132	3,871,716
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	2,032,731	1,674,930
Total nonaccrual loans	7,309	4,435
Total past due	22,204	7,306
Total Loans	2,054,935	1,682,236
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	1,231,221	991,136
Total nonaccrual loans	3,143	1,622
Total past due	8,161	3,002
Total Loans	1,239,382	994,138
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	333,897	214,174
Total nonaccrual loans	4,472	1,974
Total past due	11,086	1,974
Total Loans	344,983	216,148
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	593,043	485,465
Total nonaccrual loans	2,010	2,336
Total past due	6,459	4,121
Total Loans	599,502	489,586
Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	453,279	414,303
Total nonaccrual loans	2,026	2,059
Total past due	4,534	4,260
Total Loans	457,813	418,563
Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	93,223	65,111
Total nonaccrual loans	179	31
Total past due	1,214	456
Total Loans	94,437	65,567
Consumer Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	7,446	2,508
Total Loans	7,446	2,508
Loans Held for Sale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	13,634	2,970
Total Loans	13,634	2,970
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	20,969	6,448
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,656	2,548
30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,875	1,227
30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,474
30 to 59 Days Past Due [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,732	565
30 to 59 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,971	1,756
30 to 59 Days Past Due [Member] | Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	261	352
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,635	2,214
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,518	323
60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,143	153
60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		0
60 to 89 Days Past Due [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,770	1,220
60 to 89 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	430	445
60 to 89 Days Past Due [Member] | Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	774	73
90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,915	$ 0
90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,721
90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,140
90 Days Past Due [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	947
90 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 107

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Securities Available-for-Sale - Composition of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 656,668	$ 629,463
Gross Unrealized Gains	11,594	12,647
Gross Unrealized Losses	(1,638)	(1,837)
Fair Value	666,624	640,273
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,893	14,873
Gross Unrealized Gains	125	7
Fair Value	15,018	14,880
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	267,604	268,029
Gross Unrealized Gains	2,935	2,334
Gross Unrealized Losses	(427)	(1,078)
Fair Value	270,112	269,285
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,160	116,897
Gross Unrealized Gains	1,549	1,257
Gross Unrealized Losses	(132)	(148)
Fair Value	139,577	118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,155	45,274
Gross Unrealized Gains	1,450	1,548
Gross Unrealized Losses	(186)	(154)
Fair Value	43,419	46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	49,737	39,834
Gross Unrealized Gains	312	232
Gross Unrealized Losses	(373)	(393)
Fair Value	49,676	39,673
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	136,540	136,977
Gross Unrealized Gains	3,927	5,789
Gross Unrealized Losses	(520)	(64)
Fair Value	139,947	142,702
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	649,089	621,884
Gross Unrealized Gains	10,298	11,167
Gross Unrealized Losses	(1,638)	(1,837)
Fair Value	657,749	631,214
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Gross Unrealized Gains	1,296	1,480
Fair Value	$ 8,875	$ 9,059

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Borrowings (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Summary of Information Pertaining to Borrowings

Information pertaining to borrowings is summarized in the table below as of the dates presented:

	June 30, 2015				December 31, 2014
(dollars in thousands)	Balance		Weighted Average Rate		Balance		Weighted Average Rate
Short-term borrowings
Securities sold under repurchase agreements	$	46,235	0.01	%	$	30,605	0.01	%
Short-term borrowings	230,975		0.33	%	290,000		0.31	%
Total short-term borrowings	277,210		0.28	%	320,605		0.27	%
Long-term borrowings
Other long-term borrowings	118,228		0.76	%	19,442		3.00	%
Junior subordinated debt securities	45,619		2.74	%	45,619		2.70	%
Total long-term borrowings	163,847		1.31	%	65,061		2.79	%
Total Borrowings	$	441,057	0.66	%	$	385,666	0.70	%

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Letters of Credit

The following table sets forth the commitments and letters of credit as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Commitments to extend credit	$	1,453,491	$	1,158,628
Standby letters of credit	98,838		73,584
Total	$	1,552,329	$	1,232,212

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Basis of Presentation

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Basis of Presentation

Principles of Consolidation

The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

Basis of Presentation

The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our annual report on Form 10-K for the year ended December 31, 2014, filed with the Securities and Exchange Commission, or SEC, on February 20, 2015. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

Reclassification

Certain amounts in the prior periods’ financial statements and footnotes have been reclassified to conform to the current period’s presentation. The reclassifications had no significant effect on our results of operations or financial condition.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Recently Adopted Accounting Standards Updates, or ASU

Repurchase-To-Maturity Transactions, Repurchase Financings, and Disclosures

In June 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures which introduces two accounting changes to the Transfers and Servicing guidance (Topic 860). Repurchase-to-maturity transactions will be accounted for as secured borrowing transactions on the balance sheet and for repurchase financing arrangements, an entity will account separately for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. This will also generally result in secured borrowing accounting for the repurchase agreement. With respect to disclosures, a transferor is required to disclose information about transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the transferee. Additionally, new disclosures are required for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The new disclosure for transactions accounted for as secured borrowings is required for interim periods beginning after March 15, 2015. These new disclosures are included in Note 9. Borrowings. The adoption of this ASU had no impact on our results of operations or financial position.

Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity

In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. The guidance applies to all entities that dispose of components. It will significantly change current practices for assessing discontinued operations and affect an entity’s income and earnings per share from continuing operations. An entity is required to reclassify assets and liabilities of a discontinued operation that are classified as held for sale or disposed of in the current period for all comparative periods presented. The ASU requires that an entity present in the statement of cash flows or disclose in a note either total operating and investing cash flows for discontinued operations, or depreciation, amortization, capital expenditures and significant operating and investing noncash items related to discontinued operations. Additional disclosures are required when an entity retains significant continuing involvement with a discontinued operation after its disposal, including the amount of cash flows to and from a discontinued operation. The new standard applies prospectively after the effective date of December 15, 2014, and early adoption was permitted. The adoption of this ASU had no impact on our results of operations or financial position.

Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure

In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The ASU clarifies that an in substance repossession or foreclosure has occurred and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure. Interim and annual disclosure is required of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The new standard is effective using either the modified retrospective transition method or a prospective transition method for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption was permitted. The adoption of this ASU had no impact on our results of operations or financial position.

Accounting for Investments in Qualified Affordable Housing Projects

In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. The proportional amortization method permits the amortization of the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption was permitted. This ASU did not have a material impact on our results of operations or financial position. We did not adopt the proportional amortization method. Refer to Note 14 for additional disclosure.

Recently Issued Accounting Standards Updates not yet Adopted

Intangibles – Goodwill and Other – Internal-Use Software: Customer's Accounting for Fees Paid in a Cloud Computing Arrangement

In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. The main provisions of ASU 2015-05 provide a basis for evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, then the arrangement should be accounted for as a service contract. The standard is effective for annual periods and interim periods beginning after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Interest – Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs

In April 2015, the FASB issued ASU No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Consolidation: Amendments to the Consolidation Analysis

In April 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The amendments in this ASU affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. Specifically, the amendments: 1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, 2) Eliminate the presumption that a general partner should consolidate a limited partnership, 3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, 4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2A-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this ASU are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. We are currently evaluating the impact that these amendments may have on our consolidated financial statements. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Income Statement – Extraordinary and Unusual Items: Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary

In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary. The amendments in this ASU eliminate from GAAP the concept of extraordinary items and eliminate the requirements for reporting entities to consider whether an underlying event or transaction is extraordinary. The presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

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Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Other Comprehensive Income

The following table presents the tax effects of the components of other comprehensive income (loss) for the periods presented:

	Three Months Ended June 30, 2015									Three Months Ended June 30, 2014
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in unrealized (losses)/gains on securities available-for-sale	$	(5,872	)	$	2,056		$	(3,816	)	$	5,401		$	(1,891	)	$	3,510
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	34			(12		)	22			(40		)	15			(25		)
Adjustment to funded status of employee benefit plans	463			(162		)	301			211			(74		)	137
Other Comprehensive (Loss)/Income	$	(5,375	)	$	1,882		$	(3,493	)	$	5,572		$	(1,950	)	$	3,622
(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
	Six Months Ended June 30, 2015									Six Months Ended June 30, 2014
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in unrealized (losses)/ gains on securities available-for-sale	$	(889	)	$	311		$	(578	)	$	9,876		$	(3,457	)	$	6,419
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	34			(12		)	22			(41		)	15			(26		)
Adjustment to funded status of employee benefit plans	1,192			(324		)	868			423			(148		)	275
Other Comprehensive Income	$	337		$	(25	)	$	312		$	10,258		$	(3,590	)	$	6,668
(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income and have affected certain lines in the consolidated statement of comprehensive income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

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Fair Value Measurements - Additional Information (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of asset transfer from Level 1 to Level 2 on recurring basis	$ 200,000	$ 0
Fair value of asset transfer from Level 2 to Level 1 on recurring basis	0	0
Fair value of liabilities transfer from Level 1 to Level 2 on recurring basis	0	0
Fair value of liabilities transfer from Level 2 to Level 1 recurring basis	0	0
Liabilities measured at estimated fair value on nonrecurring basis		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at estimated fair value on a recurring basis		0
Liabilities measured at estimated fair value on a recurring basis	0	$ 0
Fair Value Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at estimated fair value on a recurring basis	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at estimated fair value on nonrecurring basis	$ 0

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Loans and Loans Held for Sale - Restructured Loans for Periods Stated (Detail)		3 Months Ended				6 Months Ended
		Jun. 30, 2015 USD ($) SecurityLoan		Jun. 30, 2014 USD ($) SecurityLoan		Jun. 30, 2015 USD ($) SecurityLoan		Jun. 30, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		7		7		27		19
Pre-Modification Outstanding Recorded Investment		$ 796,000	[1]	$ 233,000	[1]	$ 5,408,000	[2]	$ 2,042,000	[1]
Post-Modification Outstanding Recorded Investment		$ 796,000	[1]	229,000	[1]	5,381,000	[2]	2,019,000	[1]
Total Difference in Recorded Investment				$ (4,000)		$ (27,000)		$ (23,000)
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		1	[3]			1		0
Pre-Modification Outstanding Recorded Investment		$ 400,000	[1],[3]			$ 400,000	[2]	$ 0	[2]
Post-Modification Outstanding Recorded Investment		$ 400,000	[1],[3]			400,000	[2]	0	[2]
Total Difference in Recorded Investment						$ 0		$ 0
Principal Forgiveness [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		1				1		0
Pre-Modification Outstanding Recorded Investment		$ 400,000	[1]			$ 400,000	[2]	$ 0	[2]
Post-Modification Outstanding Recorded Investment		$ 400,000	[1]			$ 400,000	[2]	$ 0	[2]
Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1		9		1
Pre-Modification Outstanding Recorded Investment				$ 129,000	[1]	$ 3,616,000	[2]	$ 129,000	[2]
Post-Modification Outstanding Recorded Investment				127,000	[1]	3,615,000	[2]	127,000	[2]
Total Difference in Recorded Investment				$ (2,000)		$ (1,000)		$ (2,000)
Principal Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1		2		1
Pre-Modification Outstanding Recorded Investment				$ 129,000	[1]	$ 2,851,000	[2]	$ 129,000	[2]
Post-Modification Outstanding Recorded Investment				127,000	[1]	$ 2,851,000	[2]	127,000	[2]
Total Difference in Recorded Investment				$ (2,000)				(2,000)
Principal Deferral [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						6
Pre-Modification Outstanding Recorded Investment	[2]					$ 661,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 661,000		0
Principal Deferral [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						1
Pre-Modification Outstanding Recorded Investment	[2]					$ 104,000		0
Post-Modification Outstanding Recorded Investment	[2]					103,000		$ 0
Total Difference in Recorded Investment						$ (1,000)
Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		4		6		13	[4]	17	[4]
Pre-Modification Outstanding Recorded Investment		$ 171,000	[1]	$ 104,000	[1]	$ 316,000	[2],[4]	$ 894,000	[2],[4]
Post-Modification Outstanding Recorded Investment		$ 171,000	[1]	102,000	[1]	305,000	[2],[4]	873,000	[2],[4]
Total Difference in Recorded Investment				$ (2,000)		$ (11,000)	[4]	$ (21,000)	[4]
Chapter 7 Bankruptcy [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	[4]					1		1
Pre-Modification Outstanding Recorded Investment	[2],[4]					$ 3,000		$ 287,000
Post-Modification Outstanding Recorded Investment	[2],[4]					1,000		286,000
Total Difference in Recorded Investment	[4]					$ (2,000)		$ (1,000)
Chapter 7 Bankruptcy [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1				5	[4]
Pre-Modification Outstanding Recorded Investment				$ 52,000	[1]			$ 329,000	[2],[4]
Post-Modification Outstanding Recorded Investment				$ 52,000	[1]			327,000	[2],[4]
Total Difference in Recorded Investment	[4]							$ (2,000)
Chapter 7 Bankruptcy [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		4		4		12	[4]	10	[4]
Pre-Modification Outstanding Recorded Investment		$ 171,000	[1]	$ 43,000	[1]	$ 313,000	[2],[4]	$ 269,000	[2],[4]
Post-Modification Outstanding Recorded Investment		$ 171,000	[1]	41,000	[1]	304,000	[2],[4]	251,000	[2],[4]
Total Difference in Recorded Investment				$ (2,000)		$ (9,000)	[4]	$ (18,000)	[4]
Chapter 7 Bankruptcy [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1				1	[4]
Pre-Modification Outstanding Recorded Investment				$ 9,000	[1]			$ 9,000	[2],[4]
Post-Modification Outstanding Recorded Investment				$ 9,000	[1]			9,000	[2],[4]
Interest Rate Reduction and Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						2
Pre-Modification Outstanding Recorded Investment	[2]					$ 225,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 225,000		$ 0
Interest Rate Reduction and Maturity Date Extension [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		2
Pre-Modification Outstanding Recorded Investment		$ 225,000
Post-Modification Outstanding Recorded Investment		$ 225,000
Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						2		1
Pre-Modification Outstanding Recorded Investment	[2]					$ 851,000		$ 1,019,000
Post-Modification Outstanding Recorded Investment	[2]					836,000		1,019,000
Total Difference in Recorded Investment						$ (15,000)
Maturity Date Extension [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						1
Pre-Modification Outstanding Recorded Investment	[2]					$ 780,000		0
Post-Modification Outstanding Recorded Investment	[2]					765,000		$ 0
Total Difference in Recorded Investment						$ (15,000)
Maturity Date Extension [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans								1
Pre-Modification Outstanding Recorded Investment	[2]							$ 1,019,000
Post-Modification Outstanding Recorded Investment	[2]							1,019,000
Maturity Date Extension [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						2
Pre-Modification Outstanding Recorded Investment	[2]					$ 225,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 225,000		0
Maturity Date Extension [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						1
Pre-Modification Outstanding Recorded Investment	[2]					$ 71,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 71,000		$ 0

[1] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

[2] Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

[3] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

[4] Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

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Employee Benefits - Additional Information (Detail)		6 Months Ended
	Jan. 01, 2015	Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Number of consecutive years of employee's compensation		5 years
Number of total years of employee's compensation		10 years
Expected long-term rate of return on plan assets		8.00%
Lump sum death benefit to unmarried beneficiary as percent of accrued benefit payable (percent)	80.00%

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Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks, including interest-bearing deposits of $83,701 and $57,048 at June 30, 2015 and December 31, 2014	$ 146,582	$ 109,580
Securities available-for-sale, at fair value	666,624	640,273
Loans held for sale	13,634	2,970
Portfolio loans, net of unearned income	4,798,498	3,868,746
Allowance for loan losses	(48,814)	(47,911)
Portfolio loans, net	4,749,684	3,820,835
Bank owned life insurance	79,314	62,252
Premises and equipment, net	49,032	38,166
Federal Home Loan Bank and other restricted stock, at cost	23,553	15,135
Goodwill	291,204	175,820
Other intangible assets, net	7,479	2,631
Other assets	106,622	97,024
Total Assets	6,133,728	4,964,686
LIABILITIES
Noninterest-bearing demand	1,182,124	1,083,919
Interest-bearing demand	703,797	335,099
Money market	633,175	376,612
Savings	1,093,057	1,027,095
Certificates of deposit	1,247,262	1,086,117
Total Deposits	4,859,415	3,908,842
Securities sold under repurchase agreements	46,235	30,605
Short-term borrowings	230,975	290,000
Long-term borrowings	118,228	19,442
Junior subordinated debt securities	45,619	45,619
Other liabilities	62,027	61,789
Total Liabilities	5,362,499	4,356,297
SHAREHOLDERS' EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—36,130,480 shares at June 30, 2015 and 31,197,365 at December 31, 2014 Outstanding—34,812,723 shares at June 30, 2015 and 29,796,397 shares at December 31, 2014	90,326	77,993
Additional paid-in capital	209,709	78,818
Retained earnings	521,056	504,060
Accumulated other comprehensive (loss) income	(13,521)	(13,833)
Treasury stock (1,317,757 shares at June 30, 2015 and 1,400,968 shares at December 31, 2014, at cost)	(36,341)	(38,649)
Total Shareholders’ Equity	771,229	608,389
Total Liabilities and Shareholders’ Equity	$ 6,133,728	$ 4,964,686

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Securities Available-for-Sale - Schedule of Gross and Net Realized Gains and Losses on Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Gross realized gains		$ 40		$ 41
Gross realized losses	$ 34		$ 34
Net Realized Gains	$ (34)	$ 40	$ (34)	$ 41

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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Dividends declared per share (in dollars per share)	$ 0.36	$ 0.33
Common stock issued in acquisition, shares	4,933,115
Treasury stock issued for restricted awards, net of forfeitures	87,841	80,455
Forfeitures of restricted stock, shares	4,630	20,976

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Allowance for Loan Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 1,159,198	$ 976,224
Percentage of Total	100.00%	100.00%
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 1,154,983	$ 971,798
Percentage of Total	99.60%	99.50%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 4,215	$ 4,426
Percentage of Total	0.40%	0.50%
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 599,502	$ 489,586
Percentage of Total	100.00%	100.00%
Residential Mortgage [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 597,492	$ 487,250
Percentage of Total	99.70%	99.50%
Residential Mortgage [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 2,010	$ 2,336
Percentage of Total	0.30%	0.50%
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 457,813	$ 418,563
Percentage of Total	100.00%	100.00%
Home Equity [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 455,787	$ 416,504
Percentage of Total	99.60%	99.50%
Home Equity [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 2,026	$ 2,059
Percentage of Total	0.40%	0.50%
Consumer Borrower [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 94,437	$ 65,567
Percentage of Total	100.00%	100.00%
Consumer Borrower [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 94,258	$ 65,536
Percentage of Total	99.80%	99.90%
Consumer Borrower [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 179	$ 31
Percentage of Total	0.20%	0.10%
Consumer Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 7,446	$ 2,508
Percentage of Total	100.00%	100.00%
Consumer Construction [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 7,446	$ 2,508
Percentage of Total	100.00%	100.00%

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Basis of Presentation - Additional Information (Detail)	Jun. 30, 2015
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of outstanding common stock of investees accounted for using equity method of accounting	20.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of outstanding common stock of investees accounted for using equity method of accounting	50.00%

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Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Derivative Asset [Abstract]
Gross amounts recognized		$ 11,030	$ 13,203
Gross amounts offset		(17)	(222)
Net amounts presented in the Consolidated Balance Sheets		11,013	12,981
Net Amount		11,013	12,981
Derivative Liability [Abstract]
Gross amounts recognized		11,011	13,175
Gross amounts offset		(17)	(222)
Net amounts presented in the Consolidated Balance Sheets		10,994	12,953
Gross amounts not offset	[1]	(12,489)	(12,059)
Net Amount		$ (1,495)	$ 894

[1] Amounts represent posted collateral.

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Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation

The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

Basis of Presentation

Basis of Presentation

The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our annual report on Form 10-K for the year ended December 31, 2014, filed with the Securities and Exchange Commission, or SEC, on February 20, 2015. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

Reclassification

Reclassification

Certain amounts in the prior periods’ financial statements and footnotes have been reclassified to conform to the current period’s presentation. The reclassifications had no significant effect on our results of operations or financial condition.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

Recently Adopted Accounting Standards and Recently Issued Accounting Updates not yet Adopted

Recently Adopted Accounting Standards Updates, or ASU

Repurchase-To-Maturity Transactions, Repurchase Financings, and Disclosures

In June 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures which introduces two accounting changes to the Transfers and Servicing guidance (Topic 860). Repurchase-to-maturity transactions will be accounted for as secured borrowing transactions on the balance sheet and for repurchase financing arrangements, an entity will account separately for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. This will also generally result in secured borrowing accounting for the repurchase agreement. With respect to disclosures, a transferor is required to disclose information about transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the transferee. Additionally, new disclosures are required for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The new disclosure for transactions accounted for as secured borrowings is required for interim periods beginning after March 15, 2015. These new disclosures are included in Note 9. Borrowings. The adoption of this ASU had no impact on our results of operations or financial position.

Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity

In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. The guidance applies to all entities that dispose of components. It will significantly change current practices for assessing discontinued operations and affect an entity’s income and earnings per share from continuing operations. An entity is required to reclassify assets and liabilities of a discontinued operation that are classified as held for sale or disposed of in the current period for all comparative periods presented. The ASU requires that an entity present in the statement of cash flows or disclose in a note either total operating and investing cash flows for discontinued operations, or depreciation, amortization, capital expenditures and significant operating and investing noncash items related to discontinued operations. Additional disclosures are required when an entity retains significant continuing involvement with a discontinued operation after its disposal, including the amount of cash flows to and from a discontinued operation. The new standard applies prospectively after the effective date of December 15, 2014, and early adoption was permitted. The adoption of this ASU had no impact on our results of operations or financial position.

Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure

In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The ASU clarifies that an in substance repossession or foreclosure has occurred and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure. Interim and annual disclosure is required of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The new standard is effective using either the modified retrospective transition method or a prospective transition method for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption was permitted. The adoption of this ASU had no impact on our results of operations or financial position.

Accounting for Investments in Qualified Affordable Housing Projects

In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. The proportional amortization method permits the amortization of the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption was permitted. This ASU did not have a material impact on our results of operations or financial position. We did not adopt the proportional amortization method. Refer to Note 14 for additional disclosure.

Recently Issued Accounting Standards Updates not yet Adopted

Intangibles – Goodwill and Other – Internal-Use Software: Customer's Accounting for Fees Paid in a Cloud Computing Arrangement

In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. The main provisions of ASU 2015-05 provide a basis for evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, then the arrangement should be accounted for as a service contract. The standard is effective for annual periods and interim periods beginning after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Interest – Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs

In April 2015, the FASB issued ASU No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Consolidation: Amendments to the Consolidation Analysis

In April 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The amendments in this ASU affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. Specifically, the amendments: 1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, 2) Eliminate the presumption that a general partner should consolidate a limited partnership, 3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, 4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2A-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this ASU are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. We are currently evaluating the impact that these amendments may have on our consolidated financial statements. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Income Statement – Extraordinary and Unusual Items: Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary

In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary. The amendments in this ASU eliminate from GAAP the concept of extraordinary items and eliminate the requirements for reporting entities to consider whether an underlying event or transaction is extraordinary. The presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

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Business Combinations - Additional Information (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jun. 30, 2015	Mar. 04, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 291,204,000		$ 291,204,000		$ 291,204,000		$ 175,820,000
Discount on loans acquired	14,700,000		14,700,000		14,700,000
Merger related expenses			866,000	$ 0	3,167,000	$ 0
Professional services and legal			801,000	$ 875,000	1,324,000	$ 1,538,000
Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired		100.00%
Business acquisition, cash per share offered in exchange of share		$ 52.50
Shares of S&T offered for each share of Integrity (shares)		2.0627
Fair value of total consideration	171,979,000	$ 172,000,000
Cash		$ 29,500,000			29,510,000
S&T common shares issued (shares)		4,933,115
S&T common shares issued, fair value (in USD per share)		$ 28.88
Goodwill, purchase accounting adjustments			600,000
Goodwill	115,383,000	$ 115,400,000	115,383,000		115,383,000
Carryover of allowance for loan losses		0
Fair value of loans acquired	$ 788,687,000	788,700,000	$ 788,687,000		788,687,000
Discount on loans acquired		14,800,000
Merger related expenses					3,200,000
Data processing, contract termination and conversion cost expenses					1,300,000
Professional services and legal					1,200,000
Severance payments					400,000
Other expenses					$ 300,000
Commercial Real Estate [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		331,600,000
Commercial and Industrial [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		184,200,000
Construction Loans [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		92,400,000
Residential Mortgage [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		116,900,000
Home Equity [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		25,600,000
Consumer Borrower [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		36,100,000
Consumer Construction [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		$ 1,900,000

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share

The following table reconciles the components of basic earnings per share with that of diluted earnings per share for the periods presented:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except shares and per share data)	2015		2014		2015		2014
Numerator for Earnings per Share—Basic:
Net income	$	18,188	$	14,720	$	31,023	$	28,753
Less: Income allocated to participating shares	79		29		123		64
Net Income Allocated to Shareholders	$	18,109	$	14,691	$	30,900	$	28,689
Numerator for Earnings per Share—Diluted:
Net income	18,188		14,720		$	31,023	$	28,753
Net Income Available to Shareholders	$	18,188	$	14,720	$	31,023	$	28,753
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic	34,652,895		29,684,300		32,951,936		29,672,611
Add: Potentially dilutive shares	28,283		16,894		36,359		27,559
Denominator for Treasury Stock Method—Diluted	34,681,178		29,701,194		32,988,295		29,700,170
Weighted Average Shares Outstanding—Basic	34,652,895		29,684,300		32,951,936		29,672,611
Add: Average participating shares outstanding	151,134		58,973		131,563		66,563
Denominator for Two-Class Method—Diluted	34,804,029		29,743,273		33,083,499		29,739,174
Earnings per share—basic	$	0.52	$	0.49	$	0.94	$	0.97
Earnings per share—diluted	$	0.52	$	0.49	$	0.94	$	0.97
Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019	517,012		517,012		517,012		517,012
Stock options considered anti-dilutive excluded from potentially dilutive shares	155,500		428,493		155,500		428,676
Restricted stock considered anti-dilutive excluded from potentially dilutive shares	122,851		42,079		95,204		39,005

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Borrowings - Summary of Information Pertaining to Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 277,210	$ 320,605
Long-term borrowings	163,847	65,061
Total Borrowings	$ 441,057	$ 385,666
Short-term borrowings, Weighted Average Rate	0.28%	0.27%
Long-term borrowings, Weighted Average Rate	1.31%	2.79%
Total Borrowings, Weighted Average Rate	0.66%	0.70%
Securities Sold under Repurchase Agreements [Member]
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 46,235	$ 30,605
Short-term borrowings, Weighted Average Rate	0.01%	0.01%
Short-Term Borrowings [Member]
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 230,975	$ 290,000
Short-term borrowings, Weighted Average Rate	0.33%	0.31%
Other Long-Term Borrowings [Member]
Long Term And Short Term Debt [Line Items]
Long-term borrowings	$ 118,228	$ 19,442
Long-term borrowings, Weighted Average Rate	0.76%	3.00%
Junior Subordinated Debt Securities [Member]
Long Term And Short Term Debt [Line Items]
Long-term borrowings	$ 45,619	$ 45,619
Long-term borrowings, Weighted Average Rate	2.74%	2.70%

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net income	$ 31,023	$ 28,753
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,266	(845)
Provision for unfunded loan commitments	605	182
Depreciation, amortization and accretion	388	2,309
Net amortization of discounts and premiums on securities	1,802	1,898
Stock-based compensation expense	769	395
Securities losses (gains), net	34	(41)
Tax benefit from stock-based compensation	(29)	0
Mortgage loans originated for sale	(52,075)	(13,057)
Proceeds from the sale of loans	42,008	13,475
Gain on the sale of loans, net	(597)	(85)
Net increase in interest receivable	(2,542)	(243)
Net decrease in interest payable	(475)	(186)
Net decrease in other assets	1,854	10,016
Net (decrease) increase in other liabilities	(811)	1,199
Net Cash Provided by Operating Activities	25,220	43,770
INVESTING ACTIVITIES
Purchases of securities available-for-sale	(54,754)	(108,845)
Proceeds from maturities, prepayments and calls of securities available-for-sale	26,096	36,343
Proceeds from sales of securities available-for-sale	11,119	1,418
Net purchases of Federal Home Loan Bank stock	(334)	(2,189)
Net increase in loans	(141,911)	(169,209)
Proceeds from sale of loans not originated for resale	0	4,108
Purchases of premises and equipment	(2,465)	(1,719)
Proceeds from the sale of premises and equipment	27	64
Net cash paid in excess of cash acquired from bank merger	(16,347)	0
Net Cash Used in Investing Activities	(178,569)	(240,029)
FINANCING ACTIVITIES
Net increase in core deposits	297,340	141,888
Net (decrease) increase in certificates of deposit	(68,397)	50,972
Net increase (decrease) in securities sold under repurchase agreements	15,630	(8,578)
Net (decrease) increase in short-term borrowings	(127,686)	45,000
Proceeds from long-term borrowings	100,000	0
Repayments of long-term borrowings	(1,214)	(1,174)
Repayment of junior subordinated debt	(13,500)	0
Treasury shares issued-net	(111)	(160)
Issuance costs	(132)	0
Cash dividends paid to common shareholders	(11,608)	(9,810)
Tax benefit from stock-based compensation	29	0
Net Cash Provided by Financing Activities	190,351	218,138
Net increase in cash and cash equivalents	37,002	21,879
Cash and cash equivalents at beginning of period	109,580	108,356
Cash and Cash Equivalents at End of Period	146,582	130,235
Supplemental Disclosures
Loans transferred to held for sale	0	1,300
Interest paid	7,619	6,278
Income taxes paid, net of refunds	9,275	8,400
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	43,433
Net assets acquired from bank merger, excluding cash and cash equivalents		0
Transfers of loans to other real estate owned	$ 137	$ 274

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Cash and due from banks, interest-bearing amounts	$ 83,701	$ 57,048
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	36,130,480	31,197,365
Common stock, shares outstanding	34,812,723	29,796,397
Treasury stock, shares	1,317,757	1,400,968

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments

In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event a customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Our allowance for unfunded commitments totaled $2.9 million at June 30, 2015 and $2.3 million at December 31, 2014. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The allowance for unfunded commitments is determined using a similar methodology as our ALL. The reserve is calculated by applying historical loss rates and qualitative adjustments to our unfunded commitments.

Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

The following table sets forth the commitments and letters of credit as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Commitments to extend credit	$	1,453,491	$	1,158,628
Standby letters of credit	98,838		73,584
Total	$	1,552,329	$	1,232,212

Litigation

In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Entity Registrant Name	S&T BANCORP INC
Entity Central Index Key	0000719220
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		34,811,636

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Other Comprehensive Income

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Other Comprehensive Income

The following table presents the tax effects of the components of other comprehensive income (loss) for the periods presented:

	Three Months Ended June 30, 2015									Three Months Ended June 30, 2014
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in unrealized (losses)/gains on securities available-for-sale	$	(5,872	)	$	2,056		$	(3,816	)	$	5,401		$	(1,891	)	$	3,510
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	34			(12		)	22			(40		)	15			(25		)
Adjustment to funded status of employee benefit plans	463			(162		)	301			211			(74		)	137
Other Comprehensive (Loss)/Income	$	(5,375	)	$	1,882		$	(3,493	)	$	5,572		$	(1,950	)	$	3,622
(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
	Six Months Ended June 30, 2015									Six Months Ended June 30, 2014
(dollars in thousands)	Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount			Pre-Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Change in unrealized (losses)/ gains on securities available-for-sale	$	(889	)	$	311		$	(578	)	$	9,876		$	(3,457	)	$	6,419
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	34			(12		)	22			(41		)	15			(26		)
Adjustment to funded status of employee benefit plans	1,192			(324		)	868			423			(148		)	275
Other Comprehensive Income	$	337		$	(25	)	$	312		$	10,258		$	(3,590	)	$	6,668
(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income and have affected certain lines in the consolidated statement of comprehensive income as follows; the pre-tax amount is included in securities gains/losses-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
INTEREST INCOME
Loans, including fees	$ 48,933	$ 36,614	$ 88,859	$ 72,263
Investment securities:
Taxable	2,394	2,060	4,777	3,960
Tax-exempt	998	979	2,018	1,908
Dividends	286	219	872	406
Total Interest Income	52,611	39,872	96,526	78,537
INTEREST EXPENSE
Deposits	3,051	2,476	6,058	4,986
Borrowings and junior subordinated debt securities	749	541	1,398	1,105
Total Interest Expense	3,800	3,017	7,456	6,091
NET INTEREST INCOME	48,811	36,855	89,070	72,446
Provision for loan losses	2,059	(1,134)	3,266	(845)
Net Interest Income After Provision for Loan Losses	46,752	37,989	85,804	73,291
NONINTEREST INCOME
Securities (losses) gains, net	(34)	40	(34)	41
Debit and credit card fees	3,020	2,724	5,736	5,226
Wealth management fees	2,930	2,837	5,853	5,792
Service charges on deposit accounts	2,877	2,574	5,459	5,083
Insurance fees	1,391	1,425	3,041	3,102
Mortgage banking	782	264	1,308	396
Other	2,417	1,907	4,104	3,547
Total Noninterest Income	13,383	11,771	25,467	23,187
NONINTEREST EXPENSE
Salaries and employee benefits	17,455	15,772	34,235	31,148
Net occupancy	2,682	1,984	5,270	4,214
Data processing	2,555	2,219	4,876	4,314
Furniture and equipment	1,582	1,277	2,808	2,548
Marketing	1,193	960	2,009	1,578
Other taxes	1,159	893	2,002	1,524
Merger related expenses	866	0	3,167	0
FDIC insurance	808	579	1,503	1,210
Professional services and legal	801	875	1,324	1,538
Other	6,348	5,606	11,876	11,005
Total Noninterest Expense	35,449	30,165	69,070	59,079
Income Before Taxes	24,686	19,595	42,201	37,399
Provision for income taxes	6,498	4,875	11,178	8,646
Net Income	$ 18,188	$ 14,720	$ 31,023	$ 28,753
Earnings per share—basic (in dollars per share)	$ 0.52	$ 0.49	$ 0.94	$ 0.97
Earnings per share—diluted (in dollars per share)	0.52	0.49	0.94	0.97
Dividends declared per share (in dollars per share)	$ 0.18	$ 0.17	$ 0.36	$ 0.33
Comprehensive Income	$ 14,695	$ 18,343	$ 31,335	$ 35,421

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Securities Available-for-Sale

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Securities Available-for-Sale

The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:

	June 30, 2015									December 31, 2014
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,893	$	125	$	—		$	15,018	$	14,873	$	7	$	—		$	14,880
Obligations of U.S. government corporations and agencies	267,604		2,935		(427		)	270,112		268,029		2,334		(1,078		)	269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	138,160		1,549		(132		)	139,577		116,897		1,257		(148		)	118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	42,155		1,450		(186		)	43,419		45,274		1,548		(154		)	46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,737		312		(373		)	49,676		39,834		232		(393		)	39,673
Obligations of states and political subdivisions	136,540		3,927		(520		)	139,947		136,977		5,789		(64		)	142,702
Debt Securities	649,089		10,298		(1,638		)	657,749		621,884		11,167		(1,837		)	631,214
Marketable equity securities	7,579		1,296		—			8,875		7,579		1,480		—			9,059
Total	$	656,668	$	11,594	$	(1,638	)	$	666,624	$	629,463	$	12,647	$	(1,837	)	$	640,273

Realized gains and losses on the sale of securities are determined using the specific-identification method. The following table shows the composition of gross and net realized gains and losses for the periods presented:

	Three Months Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2015			2014		2015			2014
Gross realized gains	$	—		$	40	$	—		$	41
Gross realized losses	34			—		34			—
Net Realized Gains	$	(34	)	$	40	$	(34	)	$	41

The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented:

	June 30, 2015
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	33,489	$	(215	)	4	$	30,033	$	(212	)	8	$	63,522	$	(427	)
Collateralized mortgage obligations of U.S. government corporations and agencies	2	17,288		(132		)	—	—		—			2	17,288		(132		)
Residential mortgage-backed securities of U.S. government corporations and agencies	2	10,704		(186		)	—	—		—			2	10,704		(186		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	2	20,976		(180		)	1	9,610		(193		)	3	30,586		(373		)
Obligations of states and political subdivisions	10	42,967		(520		)	—	—		—			10	42,967		(520		)
Total Temporarily Impaired Securities	20	$	125,424	$	(1,233	)	5	$	39,643	$	(405	)	25	$	165,067	$	(1,638	)

	December 31, 2014
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	39,745	$	(207	)	8	$	63,149	$	(871	)	12	$	102,894	$	(1,078	)
Collateralized mortgage obligations of U.S. government corporations and agencies	1	9,323		(148		)	—	—		—			1	9,323		(148		)
Residential mortgage-backed securities of U.S. government corporations and agencies	—	—		—			1	8,982		(154		)	1	8,982		(154		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	1	9,998		(25		)	2	20,640		(368		)	3	30,638		(393		)
Obligations of states and political subdivisions	1	263		(1		)	2	10,756		(63		)	3	11,019		(64		)
Total Temporarily Impaired Securities	7	$	59,329	$	(381	)	13	$	103,527	$	(1,456	)	20	$	162,856	$	(1,837	)

We do not believe any individual unrealized loss as of June 30, 2015 represents an other than temporary impairment. As of June 30, 2015, the unrealized losses on 25 debt securities were attributable to changes in interest rates and not related to the credit quality of these securities. All debt securities are determined to be investment grade and are paying principal and interest according to the contractual terms of the security. There were no unrealized losses on marketable equity securities as of June 30, 2015. We do not intend to sell and it is not more likely than not that we will be required to sell any of the securities, referenced in the table above, in an unrealized loss position before recovery of their amortized cost.

The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive (loss)/income for the periods presented:

	June 30, 2015							December 31, 2014
(dollars in thousands)	Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains/ (Losses)		Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
Total unrealized gains/(losses) on securities available-for-sale	$	11,594	$	(1,638	)	$	9,956	$	12,647	$	(1,837	)	$	10,810
Income tax expense/(benefit)	4,058		(573		)	3,485		4,426		(643		)	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss)	$	7,536	$	(1,065	)	$	6,471	$	8,221	$	(1,194	)	$	7,027

The amortized cost and fair value of securities available-for-sale at June 30, 2015 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	June 30, 2015
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	29,892	$	30,223
Due after one year through five years	215,038		217,163
Due after five years through ten years	80,796		82,406
Due after ten years	93,311		95,285
	419,037		425,077
Collateralized mortgage obligations of U.S. government corporations and agencies	138,160		139,577
Residential mortgage-backed securities of U.S. government corporations and agencies	42,155		43,419
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,737		49,676
Debt Securities	649,089		657,749
Marketable equity securities	7,579		8,875
Total	$	656,668	$	666,624

At June 30, 2015 and December 31, 2014, securities with carrying values of $326.3 million and $289.1 million were pledged for various regulatory and legal requirements.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

We use fair value measurements when recording and disclosing certain financial assets and liabilities. Securities available-for-sale, trading assets and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans, other real estate owned, or OREO, mortgage servicing rights, or MSRs, and certain other assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which is developed, based on market data we have obtained from independent sources. Unobservable inputs reflect our estimate of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.

The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:

Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.

Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.

Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred.

The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis.

Recurring Basis

Securities Available-for-Sale

Securities available-for-sale include both debt and marketable equity securities. We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market valuation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models and vast descriptive terms and conditions databases, as well as extensive quality control programs.

Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3.

Trading Assets

We use quoted market prices to determine the fair value of our trading assets. Our trading assets are held in a Rabbi Trust under a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1.

Derivative Financial Instruments

We use derivative instruments including interest rate swaps for commercial loans with our customers, interest rate lock commitments and the sale of mortgage loans in the secondary market. We calculate the fair value for derivatives using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2. We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparties' nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting any applicable credit enhancements and collateral postings.

Nonrecurring Basis

Loans Held for Sale

Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3.

Impaired Loans

Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish a specific reserve based on the following three impairment methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate, 2) the loan’s observable market price or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers. Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Impaired loans carried at fair value are classified as Level 3.

OREO and Other Repossessed Assets

OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Like impaired loans, appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets carried at fair value are classified as Level 3.

Mortgage Servicing Rights

The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor driving the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3.

Financial Instruments

In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments.

Cash and Cash Equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value.

Loans

The fair value of variable rate performing loans that may reprice frequently at short-term market rates is based on carrying values adjusted for credit risk. The fair value of variable rate performing loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of fixed rate performing loans is estimated using a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of impaired nonperforming loans is based on their carrying values less any specific reserve. The carrying amount of accrued interest approximates fair value.

Bank Owned Life Insurance

Fair value approximates net cash surrender value of bank owned life insurance.

Federal Home Loan Bank, or FHLB, and Other Restricted Stock

It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; therefore, it is presented at carrying value.

Deposits

The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value.

Short-Term Borrowings

The carrying amounts of securities sold under repurchase agreements and other short-term borrowings approximate their fair values.

Long-Term Borrowings

The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values.

Junior Subordinated Debt Securities

The variable rate junior subordinated debt securities reprice quarterly; therefore, the fair values approximate the carrying values.

Loan Commitments and Standby Letters of Credit

Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties.

Other

Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at June 30, 2015 and December 31, 2014. Due to limited trading volume, we transferred marketable equity securities with a fair value of $0.2 million from Level 1 to Level 2 during the six month period ended June 30, 2015. There were no other transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.

	June 30, 2015
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Securities available-for-sale:
U.S. Treasury securities	$	—	$	15,018	$	—	$	15,018
Obligations of U.S. government corporations and agencies	—		270,112		—		270,112
Collateralized mortgage obligations of U.S. government corporations and agencies	—		139,577		—		139,577
Residential mortgage-backed securities of U.S. government corporations and agencies	—		43,419		—		43,419
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		49,676		—		49,676
Obligations of states and political subdivisions	—		139,947		—		139,947
Marketable equity securities	—		8,875		—		8,875
Total securities available-for-sale	—		666,624		—		666,624
Trading securities held in a Rabbi Trust	3,796		—		—		3,796
Total securities	3,796		666,624		—		670,420
Derivative financial assets:
Interest rate swaps	—		11,013		—		11,013
Interest rate lock commitments	—		366		—		366
Forward sale contracts	—		17		—		17
Total Assets	$	3,796	$	678,020	$	—	$	681,816
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	10,994	$	—	$	10,994
Total Liabilities	$	—	$	10,994	$	—	$	10,994

	December 31, 2014
(dollars in thousands)	Level 1		Level 2		Level 3		Total
ASSETS
Securities available-for-sale:
U.S. Treasury securities	$	—	$	14,880	$	—	$	14,880
Obligations of U.S. government corporations and agencies	—		269,285		—		269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	—		118,006		—		118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	—		46,668		—		46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,673		—		39,673
Obligations of states and political subdivisions	—		142,702		—		142,702
Marketable equity securities	178		8,881		—		9,059
Total securities available-for-sale	178		640,095		—		640,273
Trading securities held in a Rabbi Trust	3,456		—		—		3,456
Total securities	3,634		640,095		—		643,729
Derivative financial assets:
Interest rate swaps	—		12,981		—		12,981
Interest rate lock commitments	—		235		—		235
Forward sale contracts	—		—		—		—
Total Assets	$	3,634	$	653,311	$	—	$	656,945
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	12,953	$	—	$	12,953
Forward sale contracts	—		57		—		57
Total Liabilities	$	—	$	13,010	$	—	$	13,010

We classify financial instruments as Level 3 when valuation models are used because significant inputs are not observable in the market. We had no assets or liabilities measured at fair value on a recurring basis for which we have utilized Level 3 inputs to determine the fair value at either June 30, 2015 or December 31, 2014.

We may be required to measure certain assets and liabilities on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. The following table presents our assets that were measured at fair value on a nonrecurring basis by the fair value hierarchy level at June 30, 2015 and December 31, 2014. There were no liabilities measured at fair value on a nonrecurring basis during these periods.

	June 30, 2015								December 31, 2014
(dollars in thousands)	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
ASSETS(1)
Loans held for sale	$	—	$	—	$	2,900	$	2,900	$	—	$	—	$	—	$	—
Impaired loans	—		—		13,913		13,913		—		—		12,916		12,916
Other real estate owned	—		—		747		747		—		—		117		117
Mortgage servicing rights	—		—		721		721		—		—		1,176		1,176
Total Assets	$	—	$	—	$	18,281	$	18,281	$	—	$	—	$	14,209	$	14,209
(1)This table presents only the nonrecurring items that are recorded at fair value in our financial statements.

The carrying values and fair values of our financial instruments at June 30, 2015 and December 31, 2014 are presented in the following tables:

	Carrying Value(1)		Fair Value Measurements at June 30, 2015
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	146,582	$	146,582	$	146,582	$	—	$	—
Securities available-for-sale	666,624		666,624		—		666,624		—
Loans held for sale	13,634		13,722		—		—		13,722
Portfolio loans, net of unearned income	4,798,498		4,774,871		—		—		4,774,871
Bank owned life insurance	79,314		79,314		—		79,314		—
FHLB and other restricted stock	23,553		23,553		—		—		23,553
Trading securities held in a Rabbi Trust	3,796		3,796		3,796		—		—
Mortgage servicing rights	2,974		3,137		—		—		3,137
Interest rate swaps	11,013		11,013		—		11,013		—
Interest rate lock commitments	366		366		—		366		—
Forward sale contracts	17		17		—		17		—
LIABILITIES
Deposits	$	4,859,415	$	4,865,521	$	—	$	—	$	4,865,521
Securities sold under repurchase agreements	46,235		46,235		—		—		46,235
Short-term borrowings	230,975		230,975		—		—		230,975
Long-term borrowings	118,228		119,148		—		—		119,148
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	10,994		10,994		—		10,994		—
(1) As reported in the Consolidated Balance Sheets

	Carrying Value(1)		Fair Value Measurements at December 31, 2014
(dollars in thousands)			Total		Level 1		Level 2		Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	109,580	$	109,580	$	109,580	$	—	$	—
Securities available-for-sale	640,273		640,273		178		640,095		—
Loans held for sale	2,970		2,991		—		—		2,991
Portfolio loans, net of unearned income	3,868,746		3,827,634		—		—		3,827,634
Bank owned life insurance	62,252		62,252		—		62,252		—
FHLB and other restricted stock	15,135		15,135		—		—		15,135
Trading securities held in a Rabbi Trust	3,456		3,456		3,456		—		—
Mortgage servicing rights	2,817		2,934		—		—		2,934
Interest rate swaps	12,981		12,981		—		12,981		—
Interest rate lock commitments	235		235		—		235		—
LIABILITIES
Deposits	$	3,908,842	$	3,910,342	$	—	$	—	$	3,910,342
Securities sold under repurchase agreements	30,605		30,605		—		—		30,605
Short-term borrowings	290,000		290,000		—		—		290,000
Long-term borrowings	19,442		20,462		—		—		20,462
Junior subordinated debt securities	45,619		45,619		—		—		45,619
Interest rate swaps	12,953		12,953		—		12,953		—
Forward sale contracts	57		57		—		57		—
(1) As reported in the Consolidated Balance Sheets

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Business Combinations (Tables)

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Summary of Consideration, Assets Acquired and Liabilities Assumed

The following table summarizes total consideration, assets acquired and liabilities assumed as of June 30, 2015:

(dollars in thousands)
Consideration Paid
Cash	$	29,510
Common stock	142,469
Fair Value of Total Consideration	$	171,979
Fair Value of Assets Acquired
Cash and cash equivalents	$	13,163
Securities and other investments	11,502
Loans	788,687
Bank owned life insurance	15,974
Premises and equipment	10,855
Core deposit intangible	5,713
Other assets	19,555
Total Assets Acquired	865,449
Fair Value of Liabilities Assumed
Deposits	722,308
Borrowings	82,286
Other liabilities	4,259
Total Liabilities Assumed	808,853
Total Fair Value of Identifiable Net Assets	56,596
Goodwill	$	115,383

Schedule of Pro Forma Information

The following table presents unaudited pro forma financial information which combines the historical consolidated statements of income of S&T and Integrity to give effect to the Merger as if it had occurred on January 1, 2014, for the periods presented.

	Unaudited Pro Forma Information
	Three Months Ended June 30,				Six Months Ended June 30,
(dollars in thousands, except per share data)	2015		2014		2015		2014
Total revenue(1)	$	60,307	$	57,921	$	118,992	$	115,045
Net income (2)	$	18,816	$	17,765	$	32,728	$	33,697
Earnings per common share: (2)
Basic	$	0.54	$	0.51	$	0.95	$	0.97
Diluted	$	0.54	$	0.51	$	0.94	$	0.97

⁽¹⁾Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale.

⁽²⁾Excludes merger expenses

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Employee Benefits

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

We maintain a defined benefit pension plan, or Plan, covering all employees hired prior to January 1, 2008. The benefits are based on years of service and the employee’s compensation for the highest five consecutive years in the last ten years. Contributions are intended to provide for benefits attributed to employee service to date and for those benefits expected to be earned in the future. At this time, we are not required to make a cash contribution to the Plan in 2015. The expected long-term rate of return on plan assets is 8.00 percent. Effective January 1, 2015, the Plan was amended to provide unmarried participants with the ability to name a beneficiary to receive a lump sum death benefit equal to 80% of the participant’s accrued benefit payable at normal retirement age, in the event the participant dies while employed by S&T.

The following table summarizes the components of net periodic pension cost for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$	672		$	631		$	1,344		$	1,262
Interest cost on projected benefit obligation	1,100			1,106			2,200			2,212
Expected return on plan assets	(1,807		)	(1,735		)	(3,614		)	(3,470		)
Amortization of prior service (credit) cost	(35		)	(35		)	(70		)	(70		)
Recognized net actuarial loss	468			209			936			418
Net Periodic Pension Expense	$	398		$	176		$	796		$	352

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Derivative Instruments and Hedging Activities

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

Interest Rate Swaps

In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates.

Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial.

Derivatives contain an element of credit risk, including the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive Income.

Interest Rate Lock Commitments and Forward Sale Contracts

In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We may encounter pricing risks if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the interest rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive Income.

The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:

	Derivatives (included in Other Assets)				Derivatives (included in Other Liabilities)
(dollars in thousands)	June 30, 2015		December 31, 2014		June 30, 2015		December 31, 2014
Derivatives not Designated as Hedging Instruments:
Interest Rate Swap Contracts- Commercial Loans
Fair value	$	11,013	$	12,981	$	10,994	$	12,953
Notional amount	233,777		245,152		233,777		245,152
Collateral posted	—		—		12,489		12,059
Interest Rate Lock Commitments- Mortgage Loans
Fair value	366		235		—		—
Notional amount	14,034		8,822		—		—
Forward Sale Contracts- Mortgage Loans
Fair value	17		—		—		57
Notional amount	$	13,812	$	—	$	—	$	7,789

Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset as well as a derivative liability with the same counterparty to a swap transaction and are permitted to offset the asset position and the liability position resulting in a net presentation.

The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:

	Derivatives (included in Other Assets)						Derivatives (included in Other Liabilities)
(dollars in thousands)	June 30, 2015			December 31, 2014			June 30, 2015			December 31, 2014
Derivatives not Designated as Hedging Instruments:
Gross amounts recognized	$	11,030		$	13,203		$	11,011		$	13,175
Gross amounts offset	(17		)	(222		)	(17		)	(222		)
Net amounts presented in the Consolidated Balance Sheets	11,013			12,981			10,994			12,953
Gross amounts not offset(1)	—			—			(12,489		)	(12,059		)
Net Amount	$	11,013		$	12,981		$	(1,495	)	$	894

⁽¹⁾ Amounts represent posted collateral.

The following table indicates the gain or loss recognized in income on derivatives for the periods presented:

	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2015			2014			2015			2014
Derivatives not Designated as Hedging Instruments
Interest rate swap contracts—commercial loans	$	(21	)	$	(11	)	$	(8	)	$	(19	)
Interest rate lock commitments—mortgage loans	(8		)	199			128			207
Forward sale contracts—mortgage loans	92			(64		)	74			(93		)
Total Derivatives Gain (Loss)	$	63		$	124		$	194		$	95

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Allowance for Loan Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	$ 44,982		$ 44,982		$ 43,914
Without a related allowance, Unpaid Principal Balance	58,282		58,282		53,785
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	873		873		63
With a related allowance recorded, Unpaid Principal Balance	873		873		63
Impaired Financing Receivable, Recorded Investment, Total	45,855		45,855		43,977
Impaired Financing Receivable, Unpaid Principal Balance, Total	59,155		59,155		53,848
Impaired Financing Receivable, Related Allowance	608		608		54
Without a related allowance recorded, Average Recorded Investment	45,651	$ 46,253	45,274	$ 46,719
Without a related allowance recorded, Interest Income Recognized	418	374	792	762
With a related allowance recorded, Average Recorded Investment	545	70	337	73
With a related allowance recorded, Interest Income Recognized	2	1	3	3
Impaired Financing Receivable, Average Recorded Investment, Total	46,196	46,323	45,611	46,792
Impaired Financing Receivable, Interest Income Recognized, Total	420	375	795	765
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	18,548		18,548		19,890
Without a related allowance, Unpaid Principal Balance	25,698		25,698		25,262
With a related allowance recorded, Recorded Investment	749		749
With a related allowance recorded, Unpaid Principal Balance	749		749
Impaired Financing Receivable, Recorded Investment, Total	19,297		19,297		19,890
Impaired Financing Receivable, Unpaid Principal Balance, Total	26,447		26,447		25,262
Impaired Financing Receivable, Related Allowance	567		567
Without a related allowance recorded, Average Recorded Investment	19,733	21,382	20,455	21,980
Without a related allowance recorded, Interest Income Recognized	158	159	322	329
With a related allowance recorded, Average Recorded Investment	420		211
Impaired Financing Receivable, Average Recorded Investment, Total	20,153	21,382	20,666	21,980
Impaired Financing Receivable, Interest Income Recognized, Total	158	159	322	329
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	10,125		10,125		9,218
Without a related allowance, Unpaid Principal Balance	11,877		11,877		9,449
Impaired Financing Receivable, Recorded Investment, Total	10,125		10,125		9,218
Impaired Financing Receivable, Unpaid Principal Balance, Total	11,877		11,877		9,449
Without a related allowance recorded, Average Recorded Investment	10,782	9,317	11,162	9,066
Without a related allowance recorded, Interest Income Recognized	84	57	146	114
Impaired Financing Receivable, Average Recorded Investment, Total	10,782	9,317	11,162	9,066
Impaired Financing Receivable, Interest Income Recognized, Total	84	57	146	114
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	9,293		9,293		7,605
Without a related allowance, Unpaid Principal Balance	12,983		12,983		11,293
Impaired Financing Receivable, Recorded Investment, Total	9,293		9,293		7,605
Impaired Financing Receivable, Unpaid Principal Balance, Total	12,983		12,983		11,293
Without a related allowance recorded, Average Recorded Investment	8,119	8,279	6,628	8,301
Without a related allowance recorded, Interest Income Recognized	81	57	134	114
Impaired Financing Receivable, Average Recorded Investment, Total	8,119	8,279	6,628	8,301
Impaired Financing Receivable, Interest Income Recognized, Total	81	57	134	114
Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	6,824		6,824		7,159
Without a related allowance, Unpaid Principal Balance	7,527		7,527		7,733
With a related allowance recorded, Recorded Investment	120		120		43
With a related allowance recorded, Unpaid Principal Balance	120		120		43
Impaired Financing Receivable, Recorded Investment, Total	6,944		6,944		7,202
Impaired Financing Receivable, Unpaid Principal Balance, Total	7,647		7,647		7,776
Impaired Financing Receivable, Related Allowance	37		37		43
Without a related allowance recorded, Average Recorded Investment	6,891	7,166	6,943	7,260
Without a related allowance recorded, Interest Income Recognized	91	100	186	203
With a related allowance recorded, Average Recorded Investment	121	48	122	50
With a related allowance recorded, Interest Income Recognized	2	1	3	2
Impaired Financing Receivable, Average Recorded Investment, Total	7,012	7,214	7,065	7,310
Impaired Financing Receivable, Interest Income Recognized, Total	93	101	189	205
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	192		192		42
Without a related allowance, Unpaid Principal Balance	197		197		48
With a related allowance recorded, Recorded Investment	4		4		20
With a related allowance recorded, Unpaid Principal Balance	4		4		20
Impaired Financing Receivable, Recorded Investment, Total	196		196		62
Impaired Financing Receivable, Unpaid Principal Balance, Total	201		201		68
Impaired Financing Receivable, Related Allowance	4		4		$ 11
Without a related allowance recorded, Average Recorded Investment	126	109	86	112
Without a related allowance recorded, Interest Income Recognized	4	1	4	2
With a related allowance recorded, Average Recorded Investment	4	22	4	23
With a related allowance recorded, Interest Income Recognized				1
Impaired Financing Receivable, Average Recorded Investment, Total	130	131	90	135
Impaired Financing Receivable, Interest Income Recognized, Total	$ 4	$ 1	$ 4	$ 3

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Loans and Loans Held for Sale

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Loans and Loans Held for Sale

Loans are presented net of unearned income of $14.0 million and $2.1 million at June 30, 2015 and December 31, 2014. Included in the $14.0 million is a $14.7 million net discount related to purchase accounting fair value adjustments. The following table indicates the composition of the loans as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Commercial
Commercial real estate	$	2,054,935	$	1,682,236
Commercial and industrial	1,239,382		994,138
Commercial construction	344,983		216,148
Total Commercial Loans	3,639,300		2,892,522
Consumer
Residential mortgage	599,502		489,586
Home equity	457,813		418,563
Installment and other consumer	94,437		65,567
Consumer construction	7,446		2,508
Total Consumer Loans	1,159,198		976,224
Total Portfolio Loans	4,798,498		3,868,746
Loans held for sale	13,634		2,970
Total Loans	$	4,812,132	$	3,871,716

We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, collateral and industry and actively managing concentrations.When concentrations exist in certain segments, we mitigate this risk by monitoring the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments.Total commercial loans represented 76 percent of total portfolio loans at June 30, 2015 and 75 percent of total portfolio loans at December 31, 2014. Within our commercial portfolio, the CRE and commercial construction portfolios combined comprised $2.4 billion or 66 percent of total commercial loans and 50 percent of total portfolio loans at June 30, 2015 and 66 percent of total commercial loans and 49 percent of total portfolio loans at December 31, 2014. Of the $2.4 billion of CRE and commercial construction loans, $424.0 million were added as a result of the Merger. Further segmentation of the CRE and commercial construction portfolios by industry and collateral type reveal no concentration in excess of 7.0 percent of total loans at June 30, 2015 and December 31, 2014.

Our market area includes Pennsylvania and the contiguous states of Ohio, West Virginia, New York and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this market area resulting in a geographic concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. The conditions of the local and regional economies are monitored closely through publicly available data as well as information supplied by our customers. Management believes underwriting guidelines, active monitoring of economic conditions and ongoing review by credit administration mitigates the concentration risk present in the loan portfolio. Our CRE and commercial construction portfolios had out of market exposure of 6.3 percent of the combined portfolio and 3.1 percent of total loans at June 30, 2015 and 8.0 percent of the combined portfolio and 3.9 percent of total loans at December 31, 2014.

Troubled debt restructurings, or TDRs, are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower that we would not otherwise grant. We strive to identify borrowers in financial difficulty early and work with them to modify the terms before their loan reaches nonaccrual status. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual, there may be instances of principal forgiveness. These modifications are generally for longer term periods that would not be considered insignificant. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed as TDRs.

We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, as well as all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan to determine if they should be designated as TDRs. All TDRs are considered to be impaired loans and will be reported as impaired loans for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. Further, all impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements to be returned to accruing status. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.

The following table summarizes the restructured loans as of the dates presented:

	June 30, 2015						December 31, 2014
(dollars in thousands)	Performing TDRs		Nonperforming TDRs		Total TDRs		Performing TDRs		Nonperforming TDRs		Total TDRs
Commercial real estate	$	13,045	$	3,553	$	16,598	$	16,939	$	2,180	$	19,119
Commercial and industrial	7,899		2,226		10,125		8,074		356		8,430
Commercial construction	5,655		1,969		7,624		5,736		1,869		7,605
Residential mortgage	2,622		609		3,231		2,839		459		3,298
Home equity	3,302		411		3,713		3,342		562		3,904
Installment and other consumer	36		160		196		53		10		63
Total	$	32,559	$	8,928	$	41,487	$	36,983	$	5,436	$	42,419

There were six TDRs that returned to accruing status totaling $0.3 million during the three and six months ended June 30, 2015 and there were no TDRs that returned to accruing status for the three and six months ended June 30, 2014.

The following tables present the restructured loans during the periods presented:

	Three Months Ended June 30, 2015							Three Months Ended June 30, 2014
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment		Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Commercial real estate
Principal deferral	—	$	—	$	—	$	—	1	$	129	$	127	$	(2	)
Commercial and industrial
Principal forgiveness	1	400		400		—		—	—		—		—
Residential mortgage
Chapter 7 bankruptcy(2)	—	—		—		—		1	52		52		—
Maturity date extension and interest rate reduction	2	225		225		—		—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	4	171		171		—		4	43		41		(2		)
Installment and other consumer
Chapter 7 bankruptcy(2)	—	—		—		$	—	1	9		9		$	—
Total by Concession Type
Principal forgiveness	1	$	400	$	400	$	—	—	$	—	$	—	$	—
Principal deferral	—	—		—		—		1	129		127		(2		)
Maturity date extension and interest rate reduction	2	225		225		—		—	—		—		—
Chapter 7 bankruptcy(2)	4	171		171		—		6	104		102		(2		)
Total	7	$	796	$	796	$	—	7	$	233	$	229	$	(4	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

	Six Months Ended June 30, 2015								Six Months Ended June 30, 2014
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment			Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Commercial real estate
Principal deferral	2	$	2,851	$	2,851	$	—		1	$	129	$	127	$	(2	)
Commercial and industrial
Principal forgiveness	1	400		400		—			—	—		—		—
Principal deferral	6	661		661		—			—	—		—		—
Chapter 7 bankruptcy(2)	1	3		1		(2		)	1	287		286		(1		)
Maturity date extension	1	780		765		(15		)	—	—		—		—
Commercial Construction
Principal deferral	1	104		103		(1		)	—	—		—		—
Maturity date extension	—	—		—		—			1	1,019		1,019		—
Residential mortgage
Chapter 7 bankruptcy(2)	—	—		—		—			5	329		327		(2		)
Maturity date extension and interest rate reduction	2	225		225		—			—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	12	313		304		(9		)	10	269		251		(18		)
Maturity date extension	1	71		71		—			—	—		—		—
Installment and other consumer
Chapter 7 bankruptcy(2)	—	—		—		$	—		1	9		9		$	—
Total by Concession Type
Principal forgiveness	1	$	400	$	400	$	—		—	$	—	$	—	$	—
Principal deferral	9	3,616		3,615		(1		)	1	129		127		(2		)
Chapter 7 bankruptcy(2)	13	316		305		(11		)	17	894		873		(21		)
Maturity date extension and interest rate reduction	2	225		225		—			—	—		—		—
Maturity date extension	2	851		836		(15		)	1	1,019		1,019		—
Total	27	5,408		5,381		$	(27	)	19	$	2,042	$	2,019	$	(23	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

For the three months ended June 30, 2015, we modified four C&I loans totaling $5.5 million, four commercial construction loans totaling $1.3 million, one CRE loan totaling $0.8 million and two home equity loans totaling $0.2 million that were not considered to be TDRs. For the six months ended June 30, 2015 we modified six C&I loans totaling $5.7 million, four commercial construction loans totaling $1.3 million, three CRE loans totaling $1.0 million and two home equity loans totaling $0.2 million that were not considered to be TDRs. The modifications represented instances where there were insignificant delays in payment of three months or less or we concluded that no concession was granted. As of June 30, 2015 we have no commitments to lend additional funds on any TDRs.

Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. The following tables present a summary of TDRs which defaulted during the periods presented that had been restructured within the last 12 months prior to defaulting:

	Defaulted TDRs
	Three Months Ended			Three Months Ended
	June 30, 2015			June 30, 2014
(dollars in thousands)	Number of Defaults	Recorded Investment		Number of Defaults	Recorded Investment
Home equity	2	$	119	—	$	—
Total	2	$	119	—	$	—

	Defaulted TDRs
	Six Months Ended			Six Months Ended
	June 30, 2015			June 30, 2014
(dollars in thousands)	Number of Defaults	Recorded Investment		Number of Defaults	Recorded Investment
Residential mortgage	1	$	183	1	$	72
Home equity	3	124		—	—
Total	4	$	307	1	$	72

The following table is a summary of nonperforming assets as of the dates presented:

	Nonperforming Assets
(dollars in thousands)	June 30, 2015		December 31, 2014
Nonperforming Assets
Nonaccrual loans	$	10,211	$	7,021
Nonaccrual TDRs	8,928		5,436
Total nonaccrual loans	19,139		12,457
OREO	750		166
Total Nonperforming Assets	$	19,889	$	12,623

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Allowance for Loan Losses

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Allowance for Loan Losses

We maintain an allowance for loan losses, or ALL, at a level determined to be adequate to absorb estimated probable credit losses inherent in the loan portfolio as of the balance sheet date. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer.

The following are key risks within each portfolio segment:

CRE—Loans secured by commercial purpose real estate, including both owner occupied properties and investment properties, for various purposes such as hotels, strip malls and apartments. Operations of the individual projects as well as global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type as well as the business prospects of the lessee, if the project is not owner occupied.

C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be complete, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

Consumer Real Estate—Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residences, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

We further assess risk within each portfolio segment by pooling loans with similar risk characteristics. For the commercial loan classes, the most important indicator of risk is the internally assigned risk rating, including pass, special mention and substandard. Consumer loans are pooled by type of collateral, lien position and loan to value, or LTV, ratio for Consumer Real Estate loans. Historical loss rates are applied to these loan pools to determine the reserve for loans collectively evaluated for impairment.

The ALL methodology for groups of loans collectively evaluated for impairment is comprised of both a quantitative and qualitative analysis. A key assumption in the quantitative component of the reserve is the loss emergence period, or LEP. The LEP is an estimate of the average amount of time from the point at which a loss is incurred on a loan to the point at which the loss is confirmed. In general, the LEP will be shorter in an economic slowdown or recession and longer during times of economic stability or growth, as customers are better able to delay loss confirmation after a potential loss event has occurred. 

Another key assumption is the look-back period, or LBP, which represents the historical data period utilized to calculate loss rates.

Management monitors various credit quality indicators for both the commercial and consumer loan portfolios, including delinquency, nonperforming status and changes in risk ratings on a monthly basis.

The following tables present the age analysis of past due loans segregated by class of loans as of June 30, 2015 and December 31, 2014:

	June 30, 2015
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days Past Due(1)		Nonaccrual		Total Past Due		Total Loans
Commercial real estate	$	2,032,731	$	9,656	$	3,518	$	1,721	$	7,309	$	22,204	$	2,054,935
Commercial and industrial	1,231,221		2,875		2,143		—		3,143		8,161		1,239,382
Commercial construction	333,897		4,474		—		2,140		4,472		11,086		344,983
Residential mortgage	593,043		1,732		1,770		947		2,010		6,459		599,502
Home equity	453,279		1,971		430		107		2,026		4,534		457,813
Installment and other consumer	93,223		261		774		—		179		1,214		94,437
Consumer construction	7,446		—		—		—		—		—		7,446
Loans held for sale	13,634		—		—		—		—		—		13,634
Totals	$	4,758,474	$	20,969	$	8,635	$	4,915	$	19,139	$	53,658	$	4,812,132
(1)Represents acquired loans that were recorded at fair value at the acquisition date.

	December 31, 2014
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days Past Due		Nonaccrual		Total Past Due		Total Loans
Commercial real estate	$	1,674,930	$	2,548	$	323	$	—	$	4,435	$	7,306	$	1,682,236
Commercial and industrial	991,136		1,227		153		—		1,622		3,002		994,138
Commercial construction	214,174		—		—		—		1,974		1,974		216,148
Residential mortgage	485,465		565		1,220		—		2,336		4,121		489,586
Home equity	414,303		1,756		445		—		2,059		4,260		418,563
Installment and other consumer	65,111		352		73		—		31		456		65,567
Consumer construction	2,508		—		—		—		—		—		2,508
Loans held for sale	2,970		—		—		—		—		—		2,970
Totals	$	3,850,597	$	6,448	$	2,214	$	—	$	12,457	$	21,119	$	3,871,716

We continually monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.

Our risk ratings are consistent with regulatory guidance and are as follows:

Pass—The loan is currently performing and is of high quality.

Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Economic and market conditions, beyond the borrower’s control, may in the future necessitate this classification.

Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.

The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:

	June 30, 2015
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	1,976,311	96.2	%	$	1,158,898	93.5	%	$	300,968	87.3	%	$	3,436,177	94.4	%
Special mention	33,328		1.6	%	60,251		4.9	%	26,276		7.6	%	119,855		3.3	%
Substandard	45,296		2.2	%	20,233		1.6	%	17,739		5.1	%	83,268		2.3	%
Total	$	2,054,935	100	%	$	1,239,382	100.0	%	$	344,983	100.0	%	$	3,639,300	100.0	%
	December 31, 2014
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	1,635,132	97.2	%	$	948,663	95.4	%	$	196,520	90.9	%	$	2,780,315	96.1	%
Special mention	23,597		1.4	%	30,357		3.1	%	12,014		5.6	%	65,968		2.3	%
Substandard	23,507		1.4	%	15,118		1.5	%	7,614		3.5	%	46,239		1.6	%
Total	$	1,682,236	100.0	%	$	994,138	100.0	%	$	216,148	100.0	%	$	2,892,522	100.0	%

We monitor the delinquent status of the consumer portfolio on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans.

The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:

	June 30, 2015
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	597,492	99.7	%	$	455,787	99.6	%	$	94,258	99.8	%	$	7,446	100.0	%	$	1,154,983	99.6	%
Nonperforming	2,010		0.3	%	2,026		0.4	%	179		0.2	%	—		—	%	4,215		0.4	%
Total	$	599,502	100.0	%	$	457,813	100.0	%	$	94,437	100.0	%	$	7,446	100.0	%	$	1,159,198	100.0	%
	December 31, 2014
(dollars in thousands)	Residential Mortgage		% of Total		Home Equity		% of Total		Installment and other consumer		% of Total		Consumer Construction		% of Total		Total		% of Total
Performing	$	487,250	99.5	%	$	416,504	99.5	%	$	65,536	99.9	%	$	2,508	100.0	%	$	971,798	99.5	%
Nonperforming	2,336		0.5	%	2,059		0.5	%	31		0.1	%	—		—	%	4,426		0.5	%
Total	$	489,586	100.0	%	$	418,563	100.0	%	$	65,567	100.0	%	$	2,508	100.0	%	$	976,224	100.0	%

We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. Loans are considered to be impaired when based upon current information and events it is probable that we will be unable to collect all principal and interest payments due according to the original contractual terms of the loan agreement. All TDRs will be reported as an impaired loan for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is expected that the remaining principal and interest will be fully collected according to the restructured agreement. For all TDRs, regardless of size, as well as all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate.

The following tables summarize investments in loans considered to be impaired and the related information on those impaired loans as of the dates presented:

	June 30, 2015						December 31, 2014
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
Without a related allowance recorded:
Commercial real estate	$	18,548	$	25,698	$	—	$	19,890	$	25,262	$	—
Commercial and industrial	10,125		11,877		—		9,218		9,449		—
Commercial construction	9,293		12,983		—		7,605		11,293		—
Consumer real estate	6,824		7,527		—		7,159		7,733		—
Other consumer	192		197		—		42		48		—
Total without a Related Allowance Recorded	44,982		58,282		—		43,914		53,785		—
With a related allowance recorded:
Commercial real estate	749		749		567		—		—		—
Commercial and industrial	—		—		—		—		—		—
Commercial construction	—		—		—		—		—		—
Consumer real estate	120		120		37		43		43		43
Other consumer	4		4		4		20		20		11
Total with a Related Allowance Recorded	873		873		608		63		63		54
Total:
Commercial real estate	19,297		26,447		567		19,890		25,262		—
Commercial and industrial	10,125		11,877		—		9,218		9,449		—
Commercial construction	9,293		12,983		—		7,605		11,293		—
Consumer real estate	6,944		7,647		37		7,202		7,776		43
Other consumer	196		201		4		62		68		11
Total	$	45,855	$	59,155	$	608	$	43,977	$	53,848	$	54

The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:

	Three Months Ended
	June 30, 2015				June 30, 2014
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	$	19,733	$	158	$	21,382	$	159
Commercial and industrial	10,782		84		9,317		57
Commercial construction	8,119		81		8,279		57
Consumer real estate	6,891		91		7,166		100
Other consumer	126		4		109		1
Total without a Related Allowance Recorded	45,651		418		46,253		374
With a related allowance recorded:
Commercial real estate	420		—		—		—
Commercial and industrial	—		—		—		—
Commercial construction	—		—		—		—
Consumer real estate	121		2		48		1
Other consumer	4		—		22		—
Total with a Related Allowance Recorded	545		2		70		1
Total:
Commercial real estate	20,153		158		21,382		159
Commercial and industrial	10,782		84		9,317		57
Commercial construction	8,119		81		8,279		57
Consumer real estate	7,012		93		7,214		101
Other consumer	130		4		131		1
Total	$	46,196	$	420	$	46,323	$	375

	Six Months Ended
	June 30, 2015				June 30, 2014
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	$	20,455	$	322	$	21,980	$	329
Commercial and industrial	11,162		146		9,066		114
Commercial construction	6,628		134		8,301		114
Consumer real estate	6,943		186		7,260		203
Other consumer	86		4		112		2
Total without a Related Allowance Recorded	45,274		792		46,719		762
With a related allowance recorded:
Commercial real estate	$	211	$	—	$	—	$	—
Commercial and industrial	—		—		—		—
Commercial construction	—		—		—		—
Consumer real estate	122		3		50		2
Other consumer	4		—		23		1
Total with a Related Allowance Recorded	337		3		73		3
Total:
Commercial real estate	20,666		322		21,980		329
Commercial and industrial	11,162		146		9,066		114
Commercial construction	6,628		134		8,301		114
Consumer real estate	7,065		189		7,310		205
Other consumer	90		4		135		3
Total	$	45,611	$	795	$	46,792	$	765

The following tables detail activity in the ALL for the periods presented:

	Three Months Ended June 30, 2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,071		$	13,711		$	6,869		$	6,723		$	1,732		$	48,106
Charge-offs	(310		)	(992		)	—			(177		)	(276		)	(1,755		)
Recoveries	73			89			1			112			129			404
Net (Charge-offs)/ Recoveries	(237		)	(903		)	1			(65		)	(147		)	(1,351		)
Provision for loan losses	184			500			801			369			205			2,059
Balance at End of Period	$	19,018		$	13,308		$	7,671		$	7,027		$	1,790		$	48,814
	Three Months Ended June 30, 2014
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	19,880		$	13,979		$	5,183		$	6,408		$	1,166		$	46,616
Charge-offs	(1,737		)	(743		)	(664		)	(425		)	(177		)	(3,746		)
Recoveries	1,294			2,936			324			164			126			4,844
Net (Charge-offs)/ Recoveries	(443		)	2,193			(340		)	(261		)	(51		)	1,098
Provision for loan losses	1,296			(3,168		)	(84		)	558			264			(1,134		)
Balance at End of Period	$	20,733		$	13,004		$	4,759		$	6,705		$	1,379		$	46,580
	Six Months Ended June 30, 2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	20,164		$	13,668		$	6,093		$	6,333		$	1,653		$	47,911
Charge-offs	(376		)	(1,698		)	—			(552		)	(579		)	(3,205		)
Recoveries	176			203			2			248			213			842
Net (Charge-offs)/Recoveries	(200		)	(1,495		)	2			(304		)	(366		)	(2,363		)
Provision for loan losses	(946		)	1,135			1,576			998			503			3,266
Balance at End of Period	$	19,018		$	13,308		$	7,671		$	7,027		$	1,790		$	48,814
	Six Months Ended June 30, 2014
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of period	$	18,921		$	14,433		$	5,374		$	6,362		$	1,165		$	46,255
Charge-offs	(2,004		)	(1,033		)	(692		)	(547		)	(445		)	(4,721		)
Recoveries	1,834			3,249			375			223			210			5,891
Net (Charge-offs)/Recoveries	(170		)	2,216			(317		)	(324		)	(235		)	1,170
Provision for loan losses	1,982			(3,645		)	(298		)	667			449			(845		)
Balance at End of Period	$	20,733		$	13,004		$	4,759		$	6,705		$	1,379		$	46,580

The following tables present the ALL and recorded investments in loans by category as of the periods presented:

	June 30, 2015
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total(1)
Commercial real estate	$	567	$	18,451	$	19,018	$	19,297	$	2,035,638	$	2,054,935
Commercial and industrial	—		13,308		13,308		10,125		1,229,257		1,239,382
Commercial construction	—		7,671		7,671		9,293		335,690		344,983
Consumer real estate	37		6,990		7,027		6,944		1,057,817		1,064,761
Other consumer	4		1,786		1,790		196		94,241		94,437
Total	$	608	$	48,206	$	48,814	$	45,855	$	4,752,643	$	4,798,498
(1)Includes acquired loans.
	December 31, 2014
	Allowance for Loan Losses						Portfolio Loans
(dollars in thousands)	Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total		Individually Evaluated for Impairment		Collectively Evaluated for Impairment		Total(1)
Commercial real estate	$	—	$	20,164	$	20,164	$	19,890	$	1,662,346	$	1,682,236
Commercial and industrial	—		13,668		13,668		9,218		984,920		994,138
Commercial construction	—		6,093		6,093		7,605		208,543		216,148
Consumer real estate	43		6,290		6,333		7,202		903,455		910,657
Other consumer	11		1,642		1,653		62		65,505		65,567
Total	$	54	$	47,857	$	47,911	$	43,977	$	3,824,769	$	3,868,746
(1)Includes acquired loans.

Acquired loans are recorded at fair value with no carryover of the ALL. Credit deterioration on acquired loans incurred subsequent to the acquisition date will be recognized in the ALL through the provision.

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Borrowings

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Borrowings

Short-term borrowings are for terms under one year and were comprised of retail repurchase agreements, or REPOs, and FHLB advances. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation, or FDIC. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and are therefore accounted for as a secured borrowing. Mortgage backed securities with a total carrying value of $50.5 million at June 30, 2015 and $35.6 million at December 31, 2014 were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily.

Long-term borrowings are for original terms greater than one year and were comprised of FHLB advances, a capital lease and junior subordinated debt securities. Long-term FHLB advances are secured by the same loans as short-term borrowings. We had total long-term borrowings outstanding of $15.0 million at a fixed rate and $148.8 million at a variable rate at June 30, 2015, excluding our capital lease of $0.2 million. On March 5, 2015, we paid off $8.5 million and on June 18, 2015, we paid off the remaining $5.0 million of the $13.5 million junior subordinated debt assumed in the Merger.

Information pertaining to borrowings is summarized in the table below as of the dates presented:

	June 30, 2015				December 31, 2014
(dollars in thousands)	Balance		Weighted Average Rate		Balance		Weighted Average Rate
Short-term borrowings
Securities sold under repurchase agreements	$	46,235	0.01	%	$	30,605	0.01	%
Short-term borrowings	230,975		0.33	%	290,000		0.31	%
Total short-term borrowings	277,210		0.28	%	320,605		0.27	%
Long-term borrowings
Other long-term borrowings	118,228		0.76	%	19,442		3.00	%
Junior subordinated debt securities	45,619		2.74	%	45,619		2.70	%
Total long-term borrowings	163,847		1.31	%	65,061		2.79	%
Total Borrowings	$	441,057	0.66	%	$	385,666	0.70	%

We had total borrowings at June 30, 2015 and December 31, 2014 at the FHLB of Pittsburgh of $349.0 million and $309.3 million. The $349.0 million at June 30, 2015 consisted of $231.0 million in short-term borrowings and $118.0 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $1.9 billion at June 30, 2015. Our remaining borrowing availability is $1.4 billion. We utilized $0.5 billion of our borrowing capacity at June 30, 2015 consisting of $349.0 million for borrowings and $168.5 million for letters of credit to collateralize public funds.

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Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	$ 11,013	$ 12,981
Fair value, Derivatives (included in Other Liabilities)	10,994	12,953
Other Assets [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	11,013	12,981
Notional amount, Derivatives (included in Other Assets)	233,777	245,152
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	366	235
Notional amount, Derivatives (included in Other Assets)	14,034	8,822
Other Assets [Member] | Forward Sale Contracts-Mortgage Loans [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	17
Notional amount, Derivatives (included in Other Assets)	13,812
Other Liabilities [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]
Derivatives not Designated as Hedging Instruments
Collateral posted	12,489	12,059
Fair value, Derivatives (included in Other Liabilities)	10,994	12,953
Notional amount, Derivatives (included in Other Liabilities)	$ 233,777	245,152
Other Liabilities [Member] | Forward Sale Contracts-Mortgage Loans [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)		57
Notional amount, Derivatives (included in Other Liabilities)		$ 7,789

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Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) - Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	$ 63	$ 124	$ 194	$ 95
Interest Rate Swap Contracts-Commercial Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	(21)	(11)	(8)	(19)
Interest Rate Lock Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	(8)	199	128	207
Forward Sale Contracts-Mortgage Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	$ 92	$ (64)	$ 74	$ (93)

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Derivative Instruments and Hedging Activities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Period for commitments	60 days

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Segments (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Total Assets by Reportable Operating Segment

The following table represents total assets by reportable operating segment as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Community Banking	$	6,121,771	$	4,954,728
Insurance	8,232		7,468
Wealth Management	3,725		2,490
Total Assets	$	6,133,728	$	4,964,686

Financial Information of Segments

The following tables provide financial information for our three operating segments for the three and six month periods ended June 30, 2015 and 2014. The financial results of the business segments include allocations for shared services based on an internal analysis that supports line of business and branch performance measurement. Shared services include expenses such as employee benefits, occupancy expense, computer support and other corporate overhead. Even with these allocations, the financial results are not necessarily indicative of the business segments’ financial condition and results of operations as if they existed as independent entities. The information provided under the caption “Eliminations” represents operations not considered to be reportable segments and/or general operating expenses and eliminations and adjustments, which are necessary for purposes of reconciling to the Consolidated Financial Statements.

	Three Months Ended June 30, 2015
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	52,598		$	1	$	157	$	(145	)	$	52,611
Interest expense	4,056			—		—		(256		)	3,800
Net interest income	48,542			1		157		111			48,811
Provision for loan losses	2,059			—		—		—			2,059
Noninterest income	8,869			1,328		2,917		269			13,383
Noninterest expense	29,916			1,053		2,285		380			33,634
Depreciation expense	1,279			14		6		—			1,299
Amortization of intangible assets	495			13		8		—			516
Provision for income taxes	6,139			88		271		—			6,498
Net Income	$	17,523		$	161	$	504	$	—		$	18,188
	Three Months Ended June 30, 2014
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	39,845		$	—	$	136	$	(109	)	$	39,872
Interest expense	3,415			—		—		(398		)	3,017
Net interest income	36,430			—		136		289			36,855
Provision for loan losses	(1,134		)	—		—		—			(1,134		)
Noninterest income	7,522			1,245		2,828		176			11,771
Noninterest expense	25,092			1,044		2,442		465			29,043
Depreciation expense	805			13		7		—			825
Amortization of intangible assets	274			13		10		—			297
Provision for income taxes	4,637			61		177		—			4,875
Net Income	$	14,278		$	114	$	328	$	—		$	14,720

	Six Months Ended June 30, 2015
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	96,483		$	1	$	298	$	(256	)	$	96,526
Interest expense	7,944			—		—		(488		)	7,456
Net interest income	88,539			1		298		232			89,070
Provision for loan losses	3,266			—		—		—			3,266
Noninterest income	16,406			2,881		5,833		347			25,467
Noninterest expense	58,603			2,190		4,505		579			65,877
Depreciation expense	2,290			26		13		—			2,329
Amortization of intangible assets	822			25		17		—			864
Provision for income taxes	10,396			224		558		—			11,178
Net Income	$	29,568		$	417	$	1,038	$	—		$	31,023
	Six Months Ended June 30, 2014
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	78,475		$	—	$	310	$	(248	)	$	78,537
Interest expense	6,897			—		—		(806		)	6,091
Net interest income	71,578			—		310		558			72,446
Provision for loan losses	(845		)	—		—		—			(845		)
Noninterest income	14,375			2,766		5,764		282			23,187
Noninterest expense	49,066			2,199		4,716		840			56,821
Depreciation expense	1,607			25		13		—			1,645
Amortization of intangible assets	566			25		22		—			613
Provision for income taxes	8,002			181		463		—			8,646
Net Income	$	27,557		$	336	$	860	$	—		$	28,753

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Loans and Loans Held for Sale - Composition of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Composition of the loans
Commercial Loans	$ 3,639,300	$ 2,892,522
Consumer Loans	1,159,198	976,224
Total Portfolio Loans	4,798,498	3,868,746
Loans held for sale	13,634	2,970
Total Loans	4,812,132	3,871,716
Commercial Real Estate [Member]
Composition of the loans
Commercial Loans	2,054,935	1,682,236
Total Portfolio Loans	2,054,935	1,682,236
Total Loans	2,054,935	1,682,236
Commercial and Industrial [Member]
Composition of the loans
Commercial Loans	1,239,382	994,138
Total Portfolio Loans	1,239,382	994,138
Total Loans	1,239,382	994,138
Construction Loans [Member]
Composition of the loans
Commercial Loans	344,983	216,148
Total Portfolio Loans	344,983	216,148
Total Loans	344,983	216,148
Residential Mortgage [Member]
Composition of the loans
Consumer Loans	599,502	489,586
Total Loans	599,502	489,586
Home Equity [Member]
Composition of the loans
Consumer Loans	457,813	418,563
Total Loans	457,813	418,563
Consumer Borrower [Member]
Composition of the loans
Consumer Loans	94,437	65,567
Total Loans	94,437	65,567
Consumer Construction [Member]
Composition of the loans
Consumer Loans	7,446	2,508
Total Loans	$ 7,446	$ 2,508

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Qualified Affordable Housing Projects

6 Months Ended

Jun. 30, 2015

Investments in Affordable Housing Projects [Abstract]

Qualified Affordable Housing Projects

We invest in affordable housing projects primarily to satisfy our Community Reinvestment Act requirements. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. Our total investment in qualified affordable housing projects totaled $16.8 million at June 30, 2015 and $18.6 million at December 31, 2014. We had no open commitments to fund current or future investments in qualified affordable housing projects at June 30, 2015 or December 31, 2014. Amortization expense included in noninterest expense was $0.9 million and $1.9 million for the three and six months ended June 30, 2015 and $1.0 million and $2.0 million for the three and six months ended June 30, 2014. The amortization expense was offset by tax credits of $1.0 million and $2.0 million for the three and six months ended June 30, 2015 and $1.1 million and $2.2 million for the three and six months ended June 30, 2014 as a reduction to our federal tax provision.

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Securities Available-for-Sale (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Composition of Securities Available-for-Sale

The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:

	June 30, 2015									December 31, 2014
(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities	$	14,893	$	125	$	—		$	15,018	$	14,873	$	7	$	—		$	14,880
Obligations of U.S. government corporations and agencies	267,604		2,935		(427		)	270,112		268,029		2,334		(1,078		)	269,285
Collateralized mortgage obligations of U.S. government corporations and agencies	138,160		1,549		(132		)	139,577		116,897		1,257		(148		)	118,006
Residential mortgage-backed securities of U.S. government corporations and agencies	42,155		1,450		(186		)	43,419		45,274		1,548		(154		)	46,668
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,737		312		(373		)	49,676		39,834		232		(393		)	39,673
Obligations of states and political subdivisions	136,540		3,927		(520		)	139,947		136,977		5,789		(64		)	142,702
Debt Securities	649,089		10,298		(1,638		)	657,749		621,884		11,167		(1,837		)	631,214
Marketable equity securities	7,579		1,296		—			8,875		7,579		1,480		—			9,059
Total	$	656,668	$	11,594	$	(1,638	)	$	666,624	$	629,463	$	12,647	$	(1,837	)	$	640,273

Schedule of Realized Gain (Loss)

Realized gains and losses on the sale of securities are determined using the specific-identification method. The following table shows the composition of gross and net realized gains and losses for the periods presented:

	Three Months Ended June 30,					Six Months Ended June 30,
(dollars in thousands)	2015			2014		2015			2014
Gross realized gains	$	—		$	40	$	—		$	41
Gross realized losses	34			—		34			—
Net Realized Gains	$	(34	)	$	40	$	(34	)	$	41

Fair Value and Age of Gross Unrealized Losses by Investment Category

The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented:

	June 30, 2015
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	33,489	$	(215	)	4	$	30,033	$	(212	)	8	$	63,522	$	(427	)
Collateralized mortgage obligations of U.S. government corporations and agencies	2	17,288		(132		)	—	—		—			2	17,288		(132		)
Residential mortgage-backed securities of U.S. government corporations and agencies	2	10,704		(186		)	—	—		—			2	10,704		(186		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	2	20,976		(180		)	1	9,610		(193		)	3	30,586		(373		)
Obligations of states and political subdivisions	10	42,967		(520		)	—	—		—			10	42,967		(520		)
Total Temporarily Impaired Securities	20	$	125,424	$	(1,233	)	5	$	39,643	$	(405	)	25	$	165,067	$	(1,638	)

	December 31, 2014
	Less Than 12 Months						12 Months or More						Total
(dollars in thousands)	Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses			Number of Securities	Fair Value		Unrealized Losses
Obligations of U.S. government corporations and agencies	4	$	39,745	$	(207	)	8	$	63,149	$	(871	)	12	$	102,894	$	(1,078	)
Collateralized mortgage obligations of U.S. government corporations and agencies	1	9,323		(148		)	—	—		—			1	9,323		(148		)
Residential mortgage-backed securities of U.S. government corporations and agencies	—	—		—			1	8,982		(154		)	1	8,982		(154		)
Commercial mortgage-backed securities of U.S. government corporations and agencies	1	9,998		(25		)	2	20,640		(368		)	3	30,638		(393		)
Obligations of states and political subdivisions	1	263		(1		)	2	10,756		(63		)	3	11,019		(64		)
Total Temporarily Impaired Securities	7	$	59,329	$	(381	)	13	$	103,527	$	(1,456	)	20	$	162,856	$	(1,837	)

Unrealized Gains and Losses, Net of Tax on Securities Available for Sale

The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive (loss)/income for the periods presented:

	June 30, 2015							December 31, 2014
(dollars in thousands)	Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains/ (Losses)		Gross Unrealized Gains		Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
Total unrealized gains/(losses) on securities available-for-sale	$	11,594	$	(1,638	)	$	9,956	$	12,647	$	(1,837	)	$	10,810
Income tax expense/(benefit)	4,058		(573		)	3,485		4,426		(643		)	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss)	$	7,536	$	(1,065	)	$	6,471	$	8,221	$	(1,194	)	$	7,027

Amortized Cost and Fair Value of Available-for-Sale Securities

The amortized cost and fair value of securities available-for-sale at June 30, 2015 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

	June 30, 2015
(dollars in thousands)	Amortized Cost		Fair Value
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions
Due in one year or less	$	29,892	$	30,223
Due after one year through five years	215,038		217,163
Due after five years through ten years	80,796		82,406
Due after ten years	93,311		95,285
	419,037		425,077
Collateralized mortgage obligations of U.S. government corporations and agencies	138,160		139,577
Residential mortgage-backed securities of U.S. government corporations and agencies	42,155		43,419
Commercial mortgage-backed securities of U.S. government corporations and agencies	49,737		49,676
Debt Securities	649,089		657,749
Marketable equity securities	7,579		8,875
Total	$	656,668	$	666,624

XML

Securities Available-for-Sale - Amortized Cost and Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 656,668	$ 629,463
Fair Value	666,624	640,273
Obligations of the U.S. Treasury and U.S. government corporations and agencies, and obligations of states and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, Amortized Cost	29,892
Due after one year through five years, Amortized Cost	215,038
Due after five years through ten years, Amortized Cost	80,796
Due after ten years, Amortized Cost	93,311
Available-for-sale Securities, Debt Maturities, Amortized Cost	419,037
Due in one year or less, Fair Value	30,223
Due after one year through five years, Fair Value	217,163
Due after five years through ten years, Fair Value	82,406
Due after ten years, Fair Value	95,285
Fair Value, Debt securities	425,077
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,160	116,897
Fair Value	139,577	118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,155	45,274
Fair Value	43,419	46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	49,737	39,834
Fair Value	49,676	39,673
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	649,089	621,884
Fair Value	657,749	631,214
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Fair Value	$ 8,875	$ 9,059

XML

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Total securities available-for-sale	$ 666,624	$ 640,273
US Treasury Securities [Member]
ASSETS
Total securities available-for-sale	15,018	14,880
Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	270,112	269,285
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	139,577	118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	43,419	46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	49,676	39,673
Obligations of States and Political Subdivisions [Member]
ASSETS
Total securities available-for-sale	139,947	142,702
Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	8,875	9,059
Fair Value Measurements, Recurring [Member]
ASSETS
Total securities available-for-sale	666,624	640,273
Trading securities held in a Rabbi Trust	3,796	3,456
Total securities	670,420	643,729
Total Assets	681,816	656,945
LIABILITIES
Total Liabilities	10,994	13,010
Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale	15,018	14,880
Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	270,112	269,285
Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	139,577	118,006
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	43,419	46,668
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	49,676	39,673
Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
ASSETS
Total securities available-for-sale	139,947	142,702
Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	8,875	9,059
Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets	11,013	12,981
LIABILITIES
Derivative financial liabilities	10,994	12,953
Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets	366	235
Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	17	0
LIABILITIES
Derivative financial liabilities		57
Level 1 [Member] | Fair Value Measurements, Recurring [Member]
ASSETS
Total securities available-for-sale	0	178
Trading securities held in a Rabbi Trust	3,796	3,456
Total securities	3,796	3,634
Total Assets	3,796	3,634
LIABILITIES
Total Liabilities	0
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale		0
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	0	178
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	0
Level 2 [Member] | Fair Value Measurements, Recurring [Member]
ASSETS
Total securities available-for-sale	666,624	640,095
Total securities	666,624	640,095
Total Assets	678,020	653,311
LIABILITIES
Total Liabilities	10,994	13,010
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale	15,018	14,880
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	270,112	269,285
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	139,577	118,006
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	43,419	46,668
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	49,676	39,673
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
ASSETS
Total securities available-for-sale	139,947	142,702
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	8,875	8,881
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets	11,013	12,981
LIABILITIES
Derivative financial liabilities	10,994	12,953
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets	366	235
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	17	0
LIABILITIES
Derivative financial liabilities		57
Level 3 [Member] | Fair Value Measurements, Recurring [Member]
LIABILITIES
Total Liabilities	0
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale		$ 0
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	$ 0

XML

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2013	$ 571,306	$ 77,993	$ 78,140	$ 468,158	$ (12,694)	$ (40,291)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,753			28,753
Other comprehensive income (loss), net of tax	6,668				6,668
Cash dividends declared	(9,810)			(9,810)
Treasury stock issued for restricted awards	(160)			(1,824)		1,664
Recognition of restricted stock compensation expense	430		430
Balance at Jun. 30, 2014	597,187	77,993	78,570	485,277	(6,026)	(38,627)
Balance at Dec. 31, 2014	608,389	77,993	78,818	504,060	(13,833)	(38,649)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,023			31,023
Other comprehensive income (loss), net of tax	312				312
Cash dividends declared	(11,608)			(11,608)
Common stock issued in acquisition	142,469	12,333	130,136
Treasury stock issued for restricted awards	(111)			(2,419)		2,308
Recognition of restricted stock compensation expense	858		858
Tax benefit from stock-based compensation	29		29
Issuance costs	(132)		(132)
Balance at Jun. 30, 2015	$ 771,229	$ 90,326	$ 209,709	$ 521,056	$ (13,521)	$ (36,341)

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Earnings Per Share

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Earnings Per Share

The following table reconciles the components of basic earnings per share with that of diluted earnings per share for the periods presented:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except shares and per share data)	2015		2014		2015		2014
Numerator for Earnings per Share—Basic:
Net income	$	18,188	$	14,720	$	31,023	$	28,753
Less: Income allocated to participating shares	79		29		123		64
Net Income Allocated to Shareholders	$	18,109	$	14,691	$	30,900	$	28,689
Numerator for Earnings per Share—Diluted:
Net income	18,188		14,720		$	31,023	$	28,753
Net Income Available to Shareholders	$	18,188	$	14,720	$	31,023	$	28,753
Denominators for Earnings per Share:
Weighted Average Shares Outstanding—Basic	34,652,895		29,684,300		32,951,936		29,672,611
Add: Potentially dilutive shares	28,283		16,894		36,359		27,559
Denominator for Treasury Stock Method—Diluted	34,681,178		29,701,194		32,988,295		29,700,170
Weighted Average Shares Outstanding—Basic	34,652,895		29,684,300		32,951,936		29,672,611
Add: Average participating shares outstanding	151,134		58,973		131,563		66,563
Denominator for Two-Class Method—Diluted	34,804,029		29,743,273		33,083,499		29,739,174
Earnings per share—basic	$	0.52	$	0.49	$	0.94	$	0.97
Earnings per share—diluted	$	0.52	$	0.49	$	0.94	$	0.97
Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019	517,012		517,012		517,012		517,012
Stock options considered anti-dilutive excluded from potentially dilutive shares	155,500		428,493		155,500		428,676
Restricted stock considered anti-dilutive excluded from potentially dilutive shares	122,851		42,079		95,204		39,005

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Allowance for Loan Losses - Additional Information (Detail) - Jun. 30, 2015 - USD ($)	Total
Financing Receivable, Impaired [Line Items]
Evaluation for impairment of substandard and nonaccrual commercial loans	$ 500,000.0
Minimum [Member]
Financing Receivable, Impaired [Line Items]
Loans considered nonperforming (in days)	90 days

XML

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Allowance for unfunded commitments	$ 2.9	$ 2.3

XML

Loans and Loans Held for Sale (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Composition of Loans

The following table indicates the composition of the loans as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Commercial
Commercial real estate	$	2,054,935	$	1,682,236
Commercial and industrial	1,239,382		994,138
Commercial construction	344,983		216,148
Total Commercial Loans	3,639,300		2,892,522
Consumer
Residential mortgage	599,502		489,586
Home equity	457,813		418,563
Installment and other consumer	94,437		65,567
Consumer construction	7,446		2,508
Total Consumer Loans	1,159,198		976,224
Total Portfolio Loans	4,798,498		3,868,746
Loans held for sale	13,634		2,970
Total Loans	$	4,812,132	$	3,871,716

Restructured Loans for Periods Presented

The following table summarizes the restructured loans as of the dates presented:

	June 30, 2015						December 31, 2014
(dollars in thousands)	Performing TDRs		Nonperforming TDRs		Total TDRs		Performing TDRs		Nonperforming TDRs		Total TDRs
Commercial real estate	$	13,045	$	3,553	$	16,598	$	16,939	$	2,180	$	19,119
Commercial and industrial	7,899		2,226		10,125		8,074		356		8,430
Commercial construction	5,655		1,969		7,624		5,736		1,869		7,605
Residential mortgage	2,622		609		3,231		2,839		459		3,298
Home equity	3,302		411		3,713		3,342		562		3,904
Installment and other consumer	36		160		196		53		10		63
Total	$	32,559	$	8,928	$	41,487	$	36,983	$	5,436	$	42,419

Restructured Loans for Periods Stated

The following tables present the restructured loans during the periods presented:

	Three Months Ended June 30, 2015							Three Months Ended June 30, 2014
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment		Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Commercial real estate
Principal deferral	—	$	—	$	—	$	—	1	$	129	$	127	$	(2	)
Commercial and industrial
Principal forgiveness	1	400		400		—		—	—		—		—
Residential mortgage
Chapter 7 bankruptcy(2)	—	—		—		—		1	52		52		—
Maturity date extension and interest rate reduction	2	225		225		—		—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	4	171		171		—		4	43		41		(2		)
Installment and other consumer
Chapter 7 bankruptcy(2)	—	—		—		$	—	1	9		9		$	—
Total by Concession Type
Principal forgiveness	1	$	400	$	400	$	—	—	$	—	$	—	$	—
Principal deferral	—	—		—		—		1	129		127		(2		)
Maturity date extension and interest rate reduction	2	225		225		—		—	—		—		—
Chapter 7 bankruptcy(2)	4	171		171		—		6	104		102		(2		)
Total	7	$	796	$	796	$	—	7	$	233	$	229	$	(4	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

	Six Months Ended June 30, 2015								Six Months Ended June 30, 2014
(dollars in thousands)	Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment			Number of Loans	Pre-Modification Outstanding Recorded Investment(1)		Post-Modification Outstanding Recorded Investment(1)		Total  Difference in Recorded Investment
Commercial real estate
Principal deferral	2	$	2,851	$	2,851	$	—		1	$	129	$	127	$	(2	)
Commercial and industrial
Principal forgiveness	1	400		400		—			—	—		—		—
Principal deferral	6	661		661		—			—	—		—		—
Chapter 7 bankruptcy(2)	1	3		1		(2		)	1	287		286		(1		)
Maturity date extension	1	780		765		(15		)	—	—		—		—
Commercial Construction
Principal deferral	1	104		103		(1		)	—	—		—		—
Maturity date extension	—	—		—		—			1	1,019		1,019		—
Residential mortgage
Chapter 7 bankruptcy(2)	—	—		—		—			5	329		327		(2		)
Maturity date extension and interest rate reduction	2	225		225		—			—	—		—		—
Home equity
Chapter 7 bankruptcy(2)	12	313		304		(9		)	10	269		251		(18		)
Maturity date extension	1	71		71		—			—	—		—		—
Installment and other consumer
Chapter 7 bankruptcy(2)	—	—		—		$	—		1	9		9		$	—
Total by Concession Type
Principal forgiveness	1	$	400	$	400	$	—		—	$	—	$	—	$	—
Principal deferral	9	3,616		3,615		(1		)	1	129		127		(2		)
Chapter 7 bankruptcy(2)	13	316		305		(11		)	17	894		873		(21		)
Maturity date extension and interest rate reduction	2	225		225		—			—	—		—		—
Maturity date extension	2	851		836		(15		)	1	1,019		1,019		—
Total	27	5,408		5,381		$	(27	)	19	$	2,042	$	2,019	$	(23	)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end. (2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

Summary of Nonperforming Assets of Defaulted TDRs

The following tables present a summary of TDRs which defaulted during the periods presented that had been restructured within the last 12 months prior to defaulting:

	Defaulted TDRs
	Three Months Ended			Three Months Ended
	June 30, 2015			June 30, 2014
(dollars in thousands)	Number of Defaults	Recorded Investment		Number of Defaults	Recorded Investment
Home equity	2	$	119	—	$	—
Total	2	$	119	—	$	—

	Defaulted TDRs
	Six Months Ended			Six Months Ended
	June 30, 2015			June 30, 2014
(dollars in thousands)	Number of Defaults	Recorded Investment		Number of Defaults	Recorded Investment
Residential mortgage	1	$	183	1	$	72
Home equity	3	124		—	—
Total	4	$	307	1	$	72

Summary of Nonperforming Assets

The following table is a summary of nonperforming assets as of the dates presented:

	Nonperforming Assets
(dollars in thousands)	June 30, 2015		December 31, 2014
Nonperforming Assets
Nonaccrual loans	$	10,211	$	7,021
Nonaccrual TDRs	8,928		5,436
Total nonaccrual loans	19,139		12,457
OREO	750		166
Total Nonperforming Assets	$	19,889	$	12,623

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Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015 segment
Segment Reporting [Abstract]
Number of Reportable Segments	3

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Business Combinations - Pro Forma Information (Details) - Integrity Bancshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition, Pro Forma Information [Abstract]
Total revenue(1)	[1]	$ 60,307	$ 57,921	$ 118,992	$ 115,045
Net income	[2]	$ 18,816	$ 17,765	$ 32,728	$ 33,697
Earnings per common share:
Basic (in USD per share)	[2]	$ 0.54	$ 0.51	$ 0.95	$ 0.97
Diluted (in USD per share)	[2]	$ 0.54	$ 0.51	$ 0.94	$ 0.97

[1] Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale.

[2] Excludes merger expenses

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Segments

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Segments

We operate three reportable operating segments: Community Banking, Insurance and Wealth Management.

• Our Community Banking segment offers services which include accepting time and demand deposits, originating commercial and consumer loans and providing letters of credit and credit card services.

• Our Insurance segment includes a full-service insurance agency offering commercial property and casualty insurance, group life and health coverage, employee benefit solutions and personal insurance lines.

• Our Wealth Management segment offers brokerage services, services as executor and trustee under wills and deeds, guardian and custodian of employee benefits and other trust and brokerage services, as well as a registered investment advisor that manages institutional accounts.

The following table represents total assets by reportable operating segment as of the dates presented:

(dollars in thousands)	June 30, 2015		December 31, 2014
Community Banking	$	6,121,771	$	4,954,728
Insurance	8,232		7,468
Wealth Management	3,725		2,490
Total Assets	$	6,133,728	$	4,964,686

The following tables provide financial information for our three operating segments for the three and six month periods ended June 30, 2015 and 2014. The financial results of the business segments include allocations for shared services based on an internal analysis that supports line of business and branch performance measurement. Shared services include expenses such as employee benefits, occupancy expense, computer support and other corporate overhead. Even with these allocations, the financial results are not necessarily indicative of the business segments’ financial condition and results of operations as if they existed as independent entities. The information provided under the caption “Eliminations” represents operations not considered to be reportable segments and/or general operating expenses and eliminations and adjustments, which are necessary for purposes of reconciling to the Consolidated Financial Statements.

	Three Months Ended June 30, 2015
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	52,598		$	1	$	157	$	(145	)	$	52,611
Interest expense	4,056			—		—		(256		)	3,800
Net interest income	48,542			1		157		111			48,811
Provision for loan losses	2,059			—		—		—			2,059
Noninterest income	8,869			1,328		2,917		269			13,383
Noninterest expense	29,916			1,053		2,285		380			33,634
Depreciation expense	1,279			14		6		—			1,299
Amortization of intangible assets	495			13		8		—			516
Provision for income taxes	6,139			88		271		—			6,498
Net Income	$	17,523		$	161	$	504	$	—		$	18,188
	Three Months Ended June 30, 2014
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	39,845		$	—	$	136	$	(109	)	$	39,872
Interest expense	3,415			—		—		(398		)	3,017
Net interest income	36,430			—		136		289			36,855
Provision for loan losses	(1,134		)	—		—		—			(1,134		)
Noninterest income	7,522			1,245		2,828		176			11,771
Noninterest expense	25,092			1,044		2,442		465			29,043
Depreciation expense	805			13		7		—			825
Amortization of intangible assets	274			13		10		—			297
Provision for income taxes	4,637			61		177		—			4,875
Net Income	$	14,278		$	114	$	328	$	—		$	14,720

	Six Months Ended June 30, 2015
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	96,483		$	1	$	298	$	(256	)	$	96,526
Interest expense	7,944			—		—		(488		)	7,456
Net interest income	88,539			1		298		232			89,070
Provision for loan losses	3,266			—		—		—			3,266
Noninterest income	16,406			2,881		5,833		347			25,467
Noninterest expense	58,603			2,190		4,505		579			65,877
Depreciation expense	2,290			26		13		—			2,329
Amortization of intangible assets	822			25		17		—			864
Provision for income taxes	10,396			224		558		—			11,178
Net Income	$	29,568		$	417	$	1,038	$	—		$	31,023
	Six Months Ended June 30, 2014
(dollars in thousands)	Community Banking			Insurance		Wealth Management		Eliminations			Consolidated
Interest income	$	78,475		$	—	$	310	$	(248	)	$	78,537
Interest expense	6,897			—		—		(806		)	6,091
Net interest income	71,578			—		310		558			72,446
Provision for loan losses	(845		)	—		—		—			(845		)
Noninterest income	14,375			2,766		5,764		282			23,187
Noninterest expense	49,066			2,199		4,716		840			56,821
Depreciation expense	1,607			25		13		—			1,645
Amortization of intangible assets	566			25		22		—			613
Provision for income taxes	8,002			181		463		—			8,646
Net Income	$	27,557		$	336	$	860	$	—		$	28,753