CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net Income	$ 16,170	$ 14,611
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	900us-gaap_ProvisionForLoanAndLeaseLosses	7,485us-gaap_ProvisionForLoanAndLeaseLosses
Net (gain)/ loss on sale of assets	274us-gaap_GainsLossesOnSalesOfAssets	(3,602)us-gaap_GainsLossesOnSalesOfAssets
Net depreciation, amortization and accretion	1,549	2,845
Decrease in other assets	5,685	10,032
Increase/ (decrease) in other liabilities	1,136	(6,534)
Net amortization on marketable securities	87	105
Noncash write-down of real estate owned	1,181us-gaap_ImpairmentOfRealEstate	648us-gaap_ImpairmentOfRealEstate
Origination of loans held for sale	(221)	(660)
Proceeds from sale of loans held for sale	224	907
Noncash compensation expense related to stock benefit plans	880us-gaap_ShareBasedCompensation	1,239us-gaap_ShareBasedCompensation
Net cash provided by operating activities	27,865	27,076
INVESTING ACTIVITIES:
Purchase of marketable securities available-for-sale	(29,985)	(22,805)
Proceeds from maturities and principal reductions of marketable securities available-for-sale	30,329	33,414
Proceeds from maturities and principal reductions of marketable securities held-to-maturity	12,914	3,643
Proceeds from sale of marketable securities available-for-sale	293	5,735
Loan originations	(496,009)	(447,423)
Proceeds from loan maturities and principal reductions	419,198	398,726
(Purchase)/ redemptions of Federal Home Loan Bank stock	(2,999)	1
Proceeds from sale of real estate owned	2,729	2,866
Sale of real estate owned for investment, net	152	152
Purchase of premises and equipment	(2,075)	(3,607)
Acquisitions, net of cash received	(438)	(2,792)
Net cash used in investing activities	(65,891)	(32,090)
FINANCING ACTIVITIES:
Increase in deposits, net	49,525us-gaap_IncreaseDecreaseInDeposits	105,984us-gaap_IncreaseDecreaseInDeposits
Proceeds from long-term borrowings	85,000
Repayments of long-term borrowings	(10,013)us-gaap_RepaymentsOfLongTermDebt	(15)us-gaap_RepaymentsOfLongTermDebt
Net decrease in short-term borrowings	(19,254)	(16,009)
Increase in advances by borrowers for taxes and insurance	4,491	4,405
Cash dividends paid	(12,973)us-gaap_PaymentsOfDividends	(21,224)us-gaap_PaymentsOfDividends
Purchase of common stock for retirement	(3,790)
Proceeds from stock options exercised	1,435	2,294
Net cash provided by financing activities	94,421	75,435
Net increase in cash and cash equivalents	56,395	70,421
Cash and cash equivalents at beginning of period	240,706	391,905
Net increase in cash and cash equivalents	56,395	70,421
Cash and cash equivalents at end of period	297,101	462,326
Cash and cash equivalents:
Cash and due from banks	83,970us-gaap_CashAndDueFromBanks	81,927us-gaap_CashAndDueFromBanks
Interest-earning deposits in other financial institutions	212,496us-gaap_InterestBearingDepositsInBanks	379,765us-gaap_InterestBearingDepositsInBanks
Federal funds sold and other short-term investments	635	634
Total cash and cash equivalents	297,101	462,326
Cash paid during the period for:
Interest on deposits and borrowings (including interest credited to deposit accounts of $5,256 and $5,819, respectively)	13,499	14,232
Income taxes	1,027us-gaap_IncomeTaxesPaid	5,016us-gaap_IncomeTaxesPaid
Business acquisitions:
Fair value of assets acquired	438	2,798
Cash paid	(438)	(2,792)
Liabilities assumed		6
Non-cash activities:
Loan foreclosures and repossessions	2,623	1,839
Sale of real estate owned financed by the Company	$ 114	$ 88

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Loans originated by the Company to finance the sale of OREO.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Amount of gain (loss) on sale or disposal of assets utilized in financial service operations.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow associated with the purchase of real estate held for investment purposes.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Name Accounting Standards Codification

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

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-Paragraph 12

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- Definition

The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Paragraph 12

-Subparagraph (a),(b)

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The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 21

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-Topic 230

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-Paragraph 16

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Name Accounting Standards Codification

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 28

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-Name Regulation S-X (SX)

-Number 210

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-Article 9

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-Name Accounting Standards Codification

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-Subparagraph (SX 210.9-04.11)

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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-Publisher FASB

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

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