LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Tables)

12 Months Ended

Dec. 31, 2016

Loans, Allowance for Loan Losses and Credit Quality [Abstract]

Schedule of Allowance for Loan Losses

The following table summarizes changes in the allowance for loan losses by loan category and bifurcates the amount of allowance allocated to each loan category based on collective impairment analysis and loans evaluated individually for impairment:

	December 31, 2016
	Commercial and Industrial			Commercial Real Estate			Commercial Construction			Small Business			Residential Real Estate			Home Equity			Other Consumer			Total
	(Dollars in thousands)
Allowance for loan losses
Beginning balance	$	13,802		$	27,327		$	5,366		$	1,264		$	2,590		$	4,889		$	587		$	55,825
Charge-offs	(593		)	(414		)	—			(228		)	(28		)	(602		)	(1,607		)	(3,472		)
Recoveries	859			564			—			195			299			141			1,080			3,138
Provision (benefit)	2,853			2,892			(844		)	271			(240		)	810			333			6,075
Ending balance	$	16,921		$	30,369		$	4,522		$	1,502		$	2,621		$	5,238		$	393		$	61,566
Ending balance: collectively evaluated for impairment	$	13,260		$	30,173		$	4,522		$	1,494		$	1,535		$	4,996		$	372		$	56,352
Ending balance: individually evaluated for impairment	$	3,661		$	196		$	—		$	8		$	1,086		$	242		$	21		$	5,214
Financing receivables ending balance:
Collectively evaluated for impairment	$	862,875		$	2,983,642		$	320,391		$	121,855		$	622,392		$	982,095		$	10,666		$	5,903,916
Individually evaluated for impairment	39,178			16,813			—			871			14,175			5,863			397			77,297
Purchased credit impaired loans	—			10,343			—			—			7,859			189			1			18,392
Total loans by group	$	902,053		$	3,010,798		$	320,391		$	122,726		$	644,426		$	988,147		$	11,064		$	5,999,605		(1)
	December 31, 2015
	Commercial and Industrial			Commercial Real Estate			Commercial Construction			Small Business			Residential Real Estate			Home Equity			Other Consumer			Total
	(Dollars in thousands)
Allowance for loan losses
Beginning balance	$	15,573		$	25,873		$	3,945		$	1,171		$	2,834		$	4,956		$	748		$	55,100
Charge-offs	(2,010		)	(330		)	—			(267		)	(285		)	(710		)	(1,316		)	(4,918		)
Recoveries	1,593			1,073			—			264			133			356			724			4,143
Provision (benefit)	$	(1,354	)	$	711		$	1,421		$	96		$	(92	)	$	287		$	431		$	1,500
Ending balance	$	13,802		$	27,327		$	5,366		$	1,264		$	2,590		$	4,889		$	587		$	55,825
Ending balance: collectively evaluated for impairment	$	13,619		$	27,123		$	5,366		$	1,260		$	1,312		$	4,651		$	564		$	53,895
Ending balance: individually evaluated for impairment	$	183		$	204		$	—		$	4		$	1,278		$	238		$	23		$	1,930
Financing receivables ending balance:
Collectively evaluated for impairment	$	838,129		$	2,619,294		$	373,064		$	95,225		$	614,014		$	921,563		$	14,427		$	5,475,716
Individually evaluated for impairment	5,147			22,986			304			1,021			15,405			5,989			558			51,410
Purchased credit impaired loans	—			11,154			—			—			9,187			251			3			20,595
Total loans by group	$	843,276		$	2,653,434		$	373,368		$	96,246		$	638,606		$	927,803		$	14,988		$	5,547,721		(1)

	December 31, 2014
	Commercial and Industrial			Commercial Real Estate			Commercial Construction		Small Business			Residential Real Estate			Home Equity			Other Consumer			Total
	(Dollars in thousands)
Allowance for loan losses
Beginning balance	$	15,622		$	24,541		$	3,371	$	1,215		$	2,760		$	5,036		$	694		$	53,239
Charge-offs	(2,097		)	(5,454		)	—		(605		)	(826		)	(750		)	(1,215		)	(10,947		)
Recoveries	462			404			—		275			424			249			591			2,405
Provision	1,586			6,382			574		286			476			421			678			10,403
Ending balance	$	15,573		$	25,873		$	3,945	$	1,171		$	2,834		$	4,956		$	748		$	55,100
Ending balance: individually evaluated for impairment	$	412		$	197		$	—	$	7		$	1,500		$	262		$	38		$	2,416
Ending balance: collectively evaluated for impairment	$	15,161		$	25,676		$	3,945	$	1,164		$	1,334		$	4,694		$	710		$	52,684
Financing receivables ending balance:
Collectively evaluated for impairment	$	856,185		$	2,304,099		$	265,501	$	84,159		$	505,799		$	858,305		$	16,335		$	4,890,383
Individually evaluated for impairment	4,654			30,729			311		1,088			15,055			5,330			868			58,035
Purchase credit impaired loans	—			12,495			182		—			9,405			228			5			22,315
Total loans by group	$	860,839		$	2,347,323		$	265,994	$	85,247		$	530,259		$	863,863		$	17,208		$	4,970,733		(1)

(1) The amount of net deferred costs on originated loans included in the ending balance was $5.1 million, $4.3 million, and $2.8 million at December 31, 2016, 2015, and 2014, respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance was $8.6 million, $6.6 million, and $1.9 million at December 31, 2016, 2015, and 2014, respectively.

Schedule of Internal Risk-Rating Categories for the Company's Commercial Portfolio

The following table details the amount of outstanding principal balances relative to each of the risk-rating categories for the Company’s commercial portfolio:

		December 31, 2016
Category	Risk Rating	Commercial and Industrial		Commercial Real Estate		Commercial Construction		Small Business		Total
		(Dollars in thousands)
Pass	1 - 6	$	783,825	$	2,876,570	$	317,099	$	120,304	$	4,097,798
Potential weakness	7	46,176		84,641		1,363		1,859		134,039
Definite weakness - loss unlikely	8	71,991		47,164		1,929		556		121,640
Partial loss probable	9	61		2,423		—		7		2,491
Definite loss	10	—		—		—		—		—
Total		$	902,053	$	3,010,798	$	320,391	$	122,726	$	4,355,968
		December 31, 2015
Category	Risk Rating	Commercial and Industrial		Commercial Real Estate		Commercial Construction		Small Business		Total
		(Dollars in thousands)
Pass	1 - 6	$	765,753	$	2,484,025	$	363,781	$	93,008	$	3,706,567
Potential weakness	7	54,375		112,022		7,678		2,444		176,519
Definite weakness - loss unlikely	8	23,073		56,276		1,909		732		81,990
Partial loss probable	9	75		1,111		—		62		1,248
Definite loss	10	—		—		—		—		—
Total		$	843,276	$	2,653,434	$	373,368	$	96,246	$	3,966,324

Schedule of Weighted Average FICO Scores and Weighted Average Combined LTV Ratio

The following table shows the weighted average FICO scores and the weighted average combined LTV ratios as of the periods indicated below:

	December 31
	2016		2015
Residential portfolio
FICO score (re-scored)(1)	743		742
LTV (re-valued)(2)	63.2	%	61.4	%
Home equity portfolio
FICO score (re-scored)(1)	767		765
LTV (re-valued)(2)	55.9	%	55.8	%

(1) The average FICO scores above are based upon rescores available from November and origination score data for loans booked between December 1 and December 31, for the years indicated.

(2) The combined LTV ratios for December 31, 2016 and 2015 are based upon updated automated valuations as of March 31, 2015 and original valuation data for loans booked from April 1, 2015 through the dates indicated. For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.

Schedule of Nonaccrual Loans

The following table shows nonaccrual loans at the dates indicated:

	December 31
	2016		2015
	(Dollars in thousands)
Commercial and industrial (1)	$	37,455	$	3,699
Commercial real estate	6,266		7,856
Commercial construction	—		304
Small business	302		239
Residential real estate	7,782		8,795
Home equity	5,553		6,742
Other consumer	47		55
Total nonaccrual loans (2)	$	57,405	$	27,690

(1) $34.6 million of this balance relates to one large relationship that was contractually current but instead placed on discretionary nonaccrual as of December 31, 2016.

(2) Included in these amounts were $5.2 million of nonaccruing TDRs at both December 31, 2016 and 2015, respectively.

Foreclosed Residential Real Estate Property [Table Text Block]

The following table shows information regarding foreclosed residential real estate property at the date indicated:

	December 31, 2016			December 31, 2015
	(Dollars in thousands)
Foreclosed residential real estate property held by the creditor	$	3,775	(1)	$	1,430
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$	1,715		$	1,059

(1) Inclusive of acquired other real estate owned of $2.1 million relating to the NEB acquisition.

Schedule of the Age Analysis of Past Due Financing Receivables

The following table shows the age analysis of past due financing receivables as of the dates indicated:

	December 31, 2016
	30-59 days			60-89 days			90 days or more			Total Past Due			Current		Total Financing Receivables		Recorded Investment >90 Days and Accruing
	Number of Loans	Principal Balance		Number of Loans	Principal Balance		Number of Loans	Principal Balance		Number of Loans	Principal Balance
	(Dollars in thousands)
Commercial and industrial	8	$	100	32	$	253	6	$	2,480	46	$	2,833	$	899,220	$	902,053	$	—
Commercial real estate	5	1,518		8	1,957		8	3,105		21	6,580		3,004,218		3,010,798		—
Commercial construction	—	—		—	—		—	—		—	—		320,391		320,391		—
Small business	9	323		—	—		19	140		28	463		122,263		122,726		—
Residential real estate	11	1,277		9	1,950		27	3,507		47	6,734		637,692		644,426		—
Home equity	19	1,117		11	767		16	1,209		46	3,093		985,054		988,147		—
Other consumer (1)	249	184		12	17		15	7		276	208		10,856		11,064		2
Total	301	$	4,519	72	$	4,944	91	$	10,448	464	$	19,911	$	5,979,694	$	5,999,605	$	2

	December 31, 2015
	30-59 days			60-89 days			90 days or more			Total Past Due			Current		Total Financing Receivables		Recorded Investment >90 Days and Accruing
	Number of Loans	Principal Balance		Number of Loans	Principal Balance		Number of Loans	Principal Balance		Number of Loans	Principal Balance
	(Dollars in thousands)
Commercial and industrial	9	$	399	4	$	1,021	8	$	3,039	21	$	4,459	$	838,817	$	843,276	$	—
Commercial real estate	19	7,349		6	1,627		13	4,458		38	13,434		2,640,000		2,653,434		—
Commercial construction	—	—		—	—		1	304		1	304		373,064		373,368		—
Small business	11	93		4	9		13	69		28	171		96,075		96,246		—
Residential real estate	20	3,119		11	2,049		19	3,433		50	8,601		630,005		638,606		—
Home equity	21	1,526		11	903		20	1,338		52	3,767		924,036		927,803		—
Other consumer (1)	297	231		12	65		13	25		322	321		14,667		14,988		—
Total	377	$	12,717	48	$	5,674	87	$	12,666	512	$	31,057	$	5,516,664	$	5,547,721	$	—

(1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

Schedule of Troubled Debt Restructuring and Other Pertinent Information

The following table shows the Company’s total TDRs and other pertinent information as of the dates indicated:

	December 31
	2016		2015
	(Dollars in thousands)
TDRs on accrual status	$	27,093	$	32,849
TDRs on nonaccrual status	5,199		5,225
Total TDRs	$	32,292	$	38,074
Amount of specific reserves included in the allowance for loan loss associated with TDRs:	$	1,417	$	1,628
Additional commitments to lend to a borrower who has been a party to a TDR:	$	1,378	$	972

Schedule of Troubled Debt Restructuring Modifications

The following table shows the modifications which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring:

	Years Ended December 31
	2016
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment(1)
	(Dollars in thousands)
Troubled debt restructurings
Commercial and industrial	10	$	1,623	$	1,623
Commercial real estate	10	2,959		2,959
Small business	3	188		188
Residential real estate	8	1,808		1,850
Home equity	13	932		932
Other consumer	6	153		153
Total	50	$	7,663	$	7,705
	2015
Troubled debt restructurings
Commercial and industrial	13	$	1,314	$	1,314
Commercial real estate	6	2,941		2,941
Small business	9	293		293
Residential real estate	8	843		870
Home equity	8	694		694
Total	44	$	6,085	$	6,112
	2014
Troubled debt restructurings
Commercial and industrial	12	$	681	$	681
Commercial real estate	13	4,329		4,329
Small business	5	133		133
Residential real estate	9	1,535		1,568
Home equity	11	923		926
Other consumer	1	8		8
Total	51	$	7,609	$	7,645

(1) The post-modification balances represent the legal principal balance of the loan on the date of modification. These amounts may show an increase when modifications include a capitalization of interest.

Schedule of Post-Modification Balance of Troubled Debt Restructuring by Type of Modification

The following table shows the Company’s post-modification balance of TDRs listed by type of modification as of the periods indicated:

	Years Ended December 31
	2016		2015		2014
	(Dollars in thousands)
Extended maturity	$	5,044	$	2,936	$	3,441
Adjusted interest rate	92		—		727
Combination rate and maturity	1,035		2,199		2,640
Court ordered concession	1,534		977		837
Total	$	7,705	$	6,112	$	7,645

Schedule of Troubled Debt Restructurings Which Have Subsequently Defaulted

The Company considers a loan to have defaulted when it reaches 90 days past due. The following table shows loans that were modified during the prior twelve months and subsequently defaulted during the periods indicated:

	Years Ended December 31
	2016			2015			2014
	Number of Contracts	Recorded Investment		Number of Contracts	Recorded Investment		Number of Contracts	Recorded Investment
	(Dollars in thousands)
Troubled debt restructurings that subsequently defaulted
Commercial & industrial	—	$	—	3	$	339	2	$	196
Commercial real estate	1	249		1	502		—	—
Residential real estate	—	—		2	326		3	214
Home equity	—	—		1	100		—	—
Total	1	$	249	7	$	1,267	5	$	410

Schedule of Impaired Loans by Loan Portfolio

The table below sets forth information regarding the Company’s impaired loans. The information for average recorded investment and interest income recognized is reflective of the full period being presented and does not take into account the date at which a loan was deemed to be impaired. See information below as of the dates indicated:

	As of and For the Years Ended December 31
	2016
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded
Commercial and industrial	$	28,776	$	29,772	$	—	$	26,472	$	927
Commercial real estate	11,628		12,891		—		12,744		437
Small business	494		569		—		534		20
Residential real estate	4,216		4,427		—		4,302		185
Home equity	4,485		4,572		—		4,602		184
Other consumer	146		146		—		160		11
Subtotal	49,745		52,377		—		48,814		1,764
With an allowance recorded
Commercial and industrial	10,402		10,440		3,661		10,760		325
Commercial real estate	5,185		5,533		196		5,491		200
Small business	377		392		8		408		21
Residential real estate	9,959		10,530		1,086		10,065		332
Home equity	1,378		1,547		242		1,403		50
Other consumer	251		252		21		268		8
Subtotal	27,552		28,694		5,214		28,395		936
Total	$	77,297	$	81,071	$	5,214	$	77,209	$	2,700
	2015
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded
Commercial and industrial	$	2,613	$	3,002	$	—	$	3,024	$	71
Commercial real estate	12,008		13,128		—		11,676		375
Commercial construction	304		305		—		308		—
Small business	527		618		—		584		22
Residential real estate	3,874		4,033		—		3,958		157
Home equity	4,893		5,005		—		5,023		195
Other consumer	184		185		—		201		15
Subtotal	24,403		26,276		—		24,774		835
With an allowance recorded
Commercial and industrial	2,534		2,648		183		2,848		48
Commercial real estate	10,978		11,047		204		10,789		592
Small business	494		523		4		535		30
Residential real estate	11,531		12,652		1,278		11,669		460
Home equity	1,096		1,287		238		655		14
Other consumer	374		389		23		408		14
Subtotal	27,007		28,546		1,930		26,904		1,158
Total	$	51,410	$	54,822	$	1,930	$	51,678	$	1,993

	2014
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded
Commercial and industrial	$	3,005	$	3,278	$	—	$	4,557	$	258
Commercial real estate	15,982		17,164		—		16,703		1,025
Commercial construction	311		311		—		311		13
Small business	692		718		—		772		45
Residential real estate	2,439		2,502		—		2,493		102
Home equity	4,169		4,221		—		4,264		198
Other consumer	338		341		—		364		24
Subtotal	26,936		28,535		—		29,464		1,665
With an allowance recorded
Commercial and industrial	1,649		1,859		412		2,032		98
Commercial real estate	14,747		15,514		197		15,650		842
Small business	396		458		7		456		32
Residential real estate	12,616		13,727		1,500		12,817		537
Home equity	1,161		1,264		262		1,203		46
Other consumer	530		530		38		580		22
Subtotal	31,099		33,352		2,416		32,738		1,577
Total	$	58,035	$	61,887	$	2,416	$	62,202	$	3,242

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]

he following table displays certain information pertaining to PCI loans at the dates indicated:

	December 31
	2016		2015
	(Dollars in thousands)
Outstanding balance	$	20,477	$	23,199
Carrying amount	$	18,392	$	20,595

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Table Text Block]

The following table summarizes activity in the accretable yield for the PCI loan portfolio:

	2016			2015
	(Dollars in thousands)
Beginning balance	$	2,827		$	2,974
Acquisition	—			319
Accretion	(1,540		)	(2,485		)
Other change in expected cash flows (1)	953			1,721
Reclassification from nonaccretable difference for loans which have paid off (2)	130			298
Ending balance	$	2,370		$	2,827

(1) Represents changes in cash flows expected to be collected resulting in increased interest income as a prospective yield adjustment over the remaining life of the loan(s).

(2) Results in increased income during the period when a loan pays off at amount greater than originally expected.