Allowance for Loan Losses - Summary of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 55,816	$ 50,347	$ 52,775	$ 48,147
Charge-offs	(5,822)	(3,496)	(8,763)	(7,123)
Recoveries	488	514	1,287	1,326
Net (Charge-offs)/ Recoveries	(5,334)	(2,982)	(7,476)	(5,797)
Provision for loan losses	4,869	4,848	10,052	9,863
Balance at End of Period	55,351	52,213	55,351	52,213
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	20,570	15,266	19,976	15,043
Charge-offs	(1,673)	(1,662)	(2,063)	(1,715)
Recoveries	155	38	233	398
Net (Charge-offs)/ Recoveries	(1,518)	(1,624)	(1,830)	(1,317)
Provision for loan losses	5,306	2,336	6,212	2,252
Balance at End of Period	24,358	15,978	24,358	15,978
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,244	14,740	10,810	10,853
Charge-offs	(2,682)	(136)	(3,396)	(2,830)
Recoveries	69	217	255	420
Net (Charge-offs)/ Recoveries	(2,613)	81	(3,141)	(2,410)
Provision for loan losses	(1,375)	(50)	1,587	6,328
Balance at End of Period	9,256	14,771	9,256	14,771
Commercial Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	14,102	10,825	13,999	12,625
Charge-offs	0	(945)	(644)	(945)
Recoveries	113	2	369	3
Net (Charge-offs)/ Recoveries	113	(943)	(275)	(942)
Provision for loan losses	(271)	1,819	220	18
Balance at End of Period	13,944	11,701	13,944	11,701
Consumer Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,956	8,261	6,095	8,400
Charge-offs	(1,097)	(290)	(1,856)	(522)
Recoveries	76	134	179	298
Net (Charge-offs)/ Recoveries	(1,021)	(156)	(1,677)	(224)
Provision for loan losses	868	313	1,385	242
Balance at End of Period	5,803	8,418	5,803	8,418
Other Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,944	1,255	1,895	1,226
Charge-offs	(370)	(463)	(804)	(1,111)
Recoveries	75	123	251	207
Net (Charge-offs)/ Recoveries	(295)	(340)	(553)	(904)
Provision for loan losses	341	430	648	1,023
Balance at End of Period	$ 1,990	$ 1,345	$ 1,990	$ 1,345