Allowance for Loan Losses (Tables)

12 Months Ended

Dec. 31, 2016

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 the dates presented:

	December 31, 2016
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non- performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,479,513	$	2,032	$	759	$	16,172	$	18,963	$	2,498,476
Commercial and industrial	1,391,475		1,061		428		8,071		9,560		1,401,035
Commercial construction	450,410		547		—		4,927		5,474		455,884
Residential mortgage	689,635		1,312		1,117		9,918		12,347		701,982
Home equity	476,866		1,470		509		3,439		5,418		482,284
Installment and other consumer	65,525		176		43		108		327		65,852
Consumer construction	5,906		—		—		—		—		5,906
Loans held for sale	3,793		—		—		—		—		3,793
Total	$	5,563,123	$	6,598	$	2,856	$	42,635	$	52,089	$	5,615,212

	December 31, 2015
(dollars in thousands)	Current		30-59 Days Past Due		60-89 Days Past Due		Non- performing		Total Past Due Loans		Total Loans
Commercial real estate	$	2,145,655	$	11,602	$	627	$	8,719	$	20,948	$	2,166,603
Commercial and industrial	1,244,802		2,453		296		9,279		12,028		1,256,830
Commercial construction	401,084		3,517		90		8,753		12,360		413,444
Residential mortgage	631,085		1,728		930		5,629		8,287		639,372
Home equity	465,055		2,365		523		2,902		5,790		470,845
Installment and other consumer	73,486		242		111		100		453		73,939
Consumer construction	6,579		—		—		—		—		6,579
Loans held for sale	35,179		94		48		—		142		35,321
Total	$	5,002,925	$	22,001	$	2,625	$	35,382	$	60,008	$	5,062,933

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:

	December 31, 2016
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,423,742	97.0	%	$	1,315,507	93.9	%	$	430,472	94.4	%	$	4,169,721	95.7	%
Special mention	33,098		1.3	%	40,409		2.9	%	14,691		3.2	%	88,198		2.0	%
Substandard	41,636		1.7	%	45,119		3.2	%	10,721		2.4	%	97,476		2.3	%
Total	$	2,498,476	100.0	%	$	1,401,035	100.0	%	$	455,884	100.0	%	$	4,355,395	100.0	%

	December 31, 2015
(dollars in thousands)	Commercial Real Estate		% of Total		Commercial and Industrial		% of Total		Commercial Construction		% of Total		Total		% of Total
Pass	$	2,094,851	96.7	%	$	1,182,685	94.1	%	$	375,808	90.9	%	$	3,653,344	95.2	%
Special mention	19,938		0.9	%	43,896		3.5	%	19,846		4.8	%	83,680		2.2	%
Substandard	51,814		2.4	%	30,249		2.4	%	17,790		4.3	%	99,853		2.6	%
Total	$	2,166,603	100.0	%	$	1,256,830	100.0	%	$	413,444	100.0	%	$	3,836,877	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:

	December 31, 2016
(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	$	692,064	98.6	%	$	478,845	99.3	%	$	65,744	99.8	%	$	5,906	100.0	%	$	1,242,559	98.9	%
Nonperforming	9,918		1.4	%	3,439		0.7	%	108		0.2	%	—		—	%	13,465		1.1	%
Total	$	701,982	100.0	%	$	482,284	100.0	%	$	65,852	100.0	%	$	5,906	100.0	%	$	1,256,024	100.0	%

	December 31, 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	$	633,743	99.1	%	$	467,943	99.4	%	$	73,839	99.8	%	$	6,579	100.0	%	$	1,182,104	99.3	%
Nonperforming	5,629		0.9	%	2,902		0.6	%	100		0.2	%	—		—	%	8,631		0.7	%
Total	$	639,372	100.0	%	$	470,845	100.0	%	$	73,939	100.0	%	$	6,579	100.0	%	$	1,190,735	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 as of the dates presented:

	December 31, 2016						December 31, 2015
(dollars in thousands)	Recorded Investment		Unpaid Principal Balance		Related Allowance		Recorded Investment		Unpaid Principal Balance		Related Allowance
With a related allowance recorded:
Commercial real estate	$	—	$	—	$	—	$	—	$	—	$	—
Commercial and industrial	964		2,433		771		—		—		—
Commercial construction	—		—		—		500		1,350		3
Consumer real estate	26		26		26		116		116		32
Other consumer	1		1		1		2		2		2
Total with a Related Allowance Recorded	991		2,460		798		618		1,468		37
Without a related allowance recorded:
Commercial real estate	16,352		17,654		—		12,661		13,157		—
Commercial and industrial	5,902		7,699		—		14,417		15,220		—
Commercial construction	6,613		10,306		—		10,998		14,200		—
Consumer real estate	12,053		12,849		—		6,845		7,521		—
Other consumer	24		31		—		111		188		—
Total without a Related Allowance Recorded	40,944		48,539		—		45,032		50,286		—
Total:
Commercial real estate	16,352		17,654		—		12,661		13,157		—
Commercial and industrial	6,866		10,132		771		14,417		15,220		—
Commercial construction	6,613		10,306		—		11,498		15,550		3
Consumer real estate	12,079		12,875		26		6,961		7,637		32
Other consumer	25		32		1		113		190		2
Total	$	41,935	$	50,999	$	798	$	45,650	$	51,754	$	37

The following table summarizes investments in loans considered to be impaired and related information on those impaired loans for the years presented:

	For the Year Ended
	December 31, 2016				December 31, 2015
(dollars in thousands)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
Without a related allowance recorded:
Commercial real estate	17,496		144		14,622		597
Commercial and industrial	6,141		160		14,416		450
Commercial construction	7,723		162		10,581		329
Consumer real estate	11,939		523		6,902		364
Other consumer	35		1		117		1
Total without a Related Allowance Recorded	43,334		990		46,638		1,741
With a related allowance recorded:
Commercial real estate	—		—		—		—
Commercial and industrial	2,438		—		—		—
Commercial construction	—		—		834		—
Consumer real estate	28		2		120		7
Other consumer	2		—		2		—
Total with a Related Allowance Recorded	2,468		2		956		7
Total:
Commercial real estate	17,496		144		14,622		597
Commercial and industrial	8,579		160		14,416		450
Commercial construction	7,723		162		11,415		329
Consumer real estate	11,967		525		7,022		371
Other consumer	37		1		119		1
Total	$	45,802	$	992	$	47,594	$	1,748

Summary of Allowance for Loan Losses

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

	2016
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of year	$	15,043		$	10,853		$	12,625		$	8,400		$	1,226		$	48,147
Charge-offs	(3,114		)	(6,810		)	(1,877		)	(1,657		)	(2,103		)	(15,561		)
Recoveries	692			722			21			433			356			2,224
Net (Charge-offs) Recoveries	(2,422		)	(6,088		)	(1,856		)	(1,224		)	(1,747		)	(13,337		)
Provision for loan losses	7,355			6,045			3,230			(1,081		)	2,416			17,965
Balance at End of Year	$	19,976		$	10,810		$	13,999		$	6,095		$	1,895		$	52,775

	2015
(dollars in thousands)	Commercial Real Estate			Commercial and Industrial			Commercial Construction			Consumer Real Estate			Other Consumer			Total Loans
Balance at beginning of year	$	20,164		$	13,668		$	6,093		$	6,333		$	1,653		$	47,911
Charge-offs	(2,787		)	(5,463		)	(3,321		)	(2,167		)	(1,528		)	(15,266		)
Recoveries	3,545			605			143			495			326			5,114
Net Recoveries (Charge-offs)	758			(4,858		)	(3,178		)	(1,672		)	(1,202		)	(10,152		)
Provision for loan losses	(5,879		)	2,043			9,710			3,739			775			10,388
Balance at End of Year	$	15,043		$	10,853		$	12,625		$	8,400		$	1,226		$	48,147

Summary of Allowance for Loan Losses and Recorded Investments

The following tables present the ALL and recorded investments in loans by category as of December 31:

	2016
	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	$	—	$	19,976	$	19,976	$	16,352	$	2,482,124	$	2,498,476
Commercial and industrial	771		10,039		10,810		6,866		1,394,169		1,401,035
Commercial construction	—		13,999		13,999		6,613		449,271		455,884
Consumer real estate	26		6,069		6,095		12,079		1,178,093		1,190,172
Other consumer	1		1,894		1,895		25		65,827		65,852
Total	$	798	$	51,977	$	52,775	$	41,935	$	5,569,484	$	5,611,419

	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	$	—	$	15,043	$	15,043	$	12,661	$	2,153,942	$	2,166,603
Commercial and industrial	—		10,853		10,853		14,417		1,242,413		1,256,830
Commercial construction	3		12,622		12,625		11,498		401,946		413,444
Consumer real estate	32		8,368		8,400		6,961		1,109,835		1,116,796
Other consumer	2		1,224		1,226		113		73,826		73,939
Total	$	37	$	48,110	$	48,147	$	45,650	$	4,981,962	$	5,027,612