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

12 Months Ended

Dec. 31, 2015

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, 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 (benefit)	$	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: collectively evaluated for impairment	$	15,161		$	25,676		$	3,945	$	1,164		$	1,334		$	4,694		$	710		$	52,684
Ending balance: individually evaluated for impairment	$	412		$	197		$	—	$	7		$	1,500		$	262		$	38		$	2,416
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
Purchased 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)

	December 31, 2013
	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	$	13,461		$	22,598		$	2,811		$	1,524		$	2,930		$	7,703		$	807		$	51,834
Charge-offs	(2,683		)	(3,587		)	(308		)	(773		)	(622		)	(1,370		)	(1,175		)	(10,518		)
Recoveries	272			206			100			279			143			135			588			1,723
Provision (benefit)	4,572			5,324			768			185			309			(1,432		)	474			10,200
Ending balance	$	15,622		$	24,541		$	3,371		$	1,215		$	2,760		$	5,036		$	694		$	53,239
Ending balance: collectively evaluated for impairment	$	14,472		$	23,776		$	3,371		$	1,106		$	1,196		$	4,920		$	624		$	49,465
Ending balance: individually evaluated for impairment	$	1,150		$	765		$	—		$	109		$	1,564		$	116		$	70		$	3,774
Financing receivables ending balance:
Collectively evaluated for impairment	$	775,053		$	2,191,132		$	223,562		$	75,337		$	515,854		$	816,925		$	18,845		$	4,616,708
Individually evaluated for impairment	9,148			39,516			100			1,903			15,200			4,890			1,298			72,055
Purchase credit impaired loans	1			18,612			197			—			10,389			326			19			29,544
Total loans by group	$	784,202		$	2,249,260		$	223,859		$	77,240		$	541,443		$	822,141		$	20,162		$	4,718,307		(1)

(1) The amount of net deferred fees on loans and net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance was $10.9 million, $4.7 million, and $3.9 million at December 31, 2015, 2014, and 2013, respectively.

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

The following table details the internal risk-rating categories for the Company’s commercial portfolio:

		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	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
		December 31, 2014
Category	Risk Rating	Commercial and Industrial		Commercial Real Estate		Commercial Construction		Small Business		Total
		(Dollars in thousands)
Pass	1 - 6	$	801,578	$	2,196,109	$	248,696	$	81,255	$	3,327,638
Potential weakness	7	37,802		82,372		15,464		2,932		138,570
Definite weakness	8	20,241		67,571		1,834		949		90,595
Partial loss probable	9	1,218		1,271		—		111		2,600
Definite loss	10	—		—		—		—		—
Total		$	860,839	$	2,347,323	$	265,994	$	85,247	$	3,559,403

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

	December 31
	2015		2014
Residential portfolio
FICO score (re-scored)(1)	742		739
LTV (re-valued)(2)	61.4	%	67.1	%
Home equity portfolio
FICO score (re-scored)(1)	765		764
LTV (re-valued)(2)	55.8	%	53.6	%

(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, 2015 are based upon updated automated valuations as of March 31, 2015 and actual score data for loans booked from April 1, 2015 through December 31, 2015. The combined LTV ratios for December 31, 2014 are based upon updated automated valuations as of February 28, 2013 and actual score data for loans booked from March 1, 2013 through December 31, 2014.

Schedule of Nonaccrual Loans

The following table shows nonaccrual loans at the dates indicated:

	December 31
	2015		2014
	(Dollars in thousands)
Commercial and industrial	$	3,699	$	2,822
Commercial real estate	7,856		7,279
Commercial construction	304		311
Small business	239		246
Residential real estate	8,795		8,697
Home equity	6,742		8,038
Other consumer	55		—
Total nonaccrual loans(1)	$	27,690	$	27,393

(1) Included in these amounts were $5.2 million nonaccruing TDRs at both December 31, 2015 and 2014, 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, 2015
	(Dollars in thousands)
Foreclosed residential real estate property held by the creditor	$	1,430
Recorded investment in mortgage loans collateralized by residential real estate property that are in the process of foreclosure	$	285

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, 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	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	$	—

	December 31, 2014
	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	18	$	3,192	10	$	1,007	19	$	2,320	47	$	6,519	$	854,320	$	860,839	$	—
Commercial real estate	19	13,428		6	1,480		16	4,225		41	19,133		2,328,190		2,347,323		—
Commercial construction	1	506		—	—		1	311		2	817		265,177		265,994		—
Small business	7	21		8	113		7	173		22	307		84,940		85,247		—
Residential real estate	13	1,670		10	1,798		36	4,826		59	8,294		521,965		530,259		106
Home equity	20	1,559		7	307		23	2,402		50	4,268		859,595		863,863		—
Other consumer	318	382		16	23		15	15		349	420		16,788		17,208		13
Total	396	$	20,758	57	$	4,728	117	$	14,272	570	$	39,758	$	4,930,975	$	4,970,733	$	119

Schedule of Troubled Debt Restructuring and Other Pertinent Information

	December 31
	2015		2014
	(Dollars in thousands)
TDRs on accrual status	$	32,849	$	38,382
TDRs on nonaccrual status	5,225		5,248
Total TDRs	$	38,074	$	43,630
Amount of specific reserves included in the allowance for loan loss associated with TDRs:	$	1,628	$	2,004
Additional commitments to lend to a borrower who has been a party to a TDR:	$	972	$	1,400

Schedule of Troubled Debt Restructuring Modifications

	Years Ended December 31
	2015
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment(1)
	(Dollars in thousands)
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
	2013
Troubled debt restructurings
Commercial and industrial	11	$	732	$	732
Commercial real estate	9	8,100		8,100
Small business	12	556		556
Residential real estate	9	2,401		2,427
Home equity	17	1,347		1,347
Other consumer	9	27		27
Total	67	$	13,163	$	13,189

(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
	2015		2014		2013
	(Dollars in thousands)
Extended maturity	$	2,936	$	3,441	$	3,582
Adjusted interest rate	—		727		—
Combination rate and maturity	2,199		2,640		8,917
Court ordered concession	977		837		690
Total	$	6,112	$	7,645	$	13,189

Schedule of Troubled Debt Restructurings Which Have Subsequently Defaulted

	Years Ended December 31
	2015			2014			2013
	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	502		—	—		1	176
Residential real estate	2	326		3	214		—	—
Home equity	1	100		—	—		—	—
Other consumer	—	—		—	—		1	1
Total	7	$	1,267	5	$	410	2	$	177

Schedule of Impaired Loans by Loan Portfolio

The table below sets forth information regarding the Company’s impaired loans as of the dates indicated:

	As of and For the Years Ended December 31
	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

	2013
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	(Dollars in thousands)
With no related allowance recorded
Commercial and industrial	$	7,147	$	7,288	$	—	$	7,338	$	338
Commercial real estate	14,283		15,891		—		15,728		1,075
Commercial construction	100		408		—		1,105		43
Small business	1,474		1,805		—		1,854		121
Residential real estate	1,972		2,026		—		2,021		95
Home equity	4,263		4,322		—		4,335		202
Other consumer	446		446		—		515		41
Subtotal	29,685		32,186		—		32,896		1,915
With an allowance recorded
Commercial and industrial	2,001		2,045		1,150		2,572		125
Commercial real estate	25,233		25,377		765		25,595		1,326
Small business	429		462		109		459		28
Residential real estate	13,228		14,197		1,564		13,405		515
Home equity	627		694		116		642		26
Other consumer	852		856		70		954		33
Subtotal	42,370		43,631		3,774		43,627		2,053
Total	$	72,055	$	75,817	$	3,774	$	76,523	$	3,968

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

	December 31
	2015		2014
	(Dollars in thousands)
Outstanding balance	$	23,199	$	25,279
Carrying amount	$	20,595	$	22,315

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:

	2015			2014
	(Dollars in thousands)
Beginning balance	$	2,974		$	2,514
Acquisition	319			—
Accretion	(2,485		)	(2,299		)
Other change in expected cash flows (1)	1,721			2,565
Reclassification from nonaccretable difference for loans which have paid off (2)	298			194
Ending balance	$	2,827		$	2,974

(1) Represents changes in cash flows expected to be collected and 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.