Allowance for Loan Losses - Summary of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 52,775	$ 48,147
Charge-offs	(2,942)	(3,628)
Recoveries	800	814
Net (Charge-offs)/ Recoveries	(2,142)	(2,814)
Provision for loan losses	5,183	5,014
Balance at End of Period	55,816	50,347
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	19,976	15,043
Charge-offs	(390)	(54)
Recoveries	78	361
Net (Charge-offs)/ Recoveries	(312)	307
Provision for loan losses	906	(84)
Balance at End of Period	20,570	15,266
Commercial And Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	10,810	10,853
Charge-offs	(715)	(2,694)
Recoveries	187	203
Net (Charge-offs)/ Recoveries	(528)	(2,491)
Provision for loan losses	2,962	6,378
Balance at End of Period	13,244	14,740
Commercial Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,999	12,625
Charge-offs	(644)	0
Recoveries	256	2
Net (Charge-offs)/ Recoveries	(388)	2
Provision for loan losses	491	(1,802)
Balance at End of Period	14,102	10,825
Consumer Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,095	8,400
Charge-offs	(759)	(232)
Recoveries	103	164
Net (Charge-offs)/ Recoveries	(656)	(68)
Provision for loan losses	517	(71)
Balance at End of Period	5,956	8,261
Other Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,895	1,226
Charge-offs	(434)	(648)
Recoveries	176	84
Net (Charge-offs)/ Recoveries	(258)	(564)
Provision for loan losses	307	593
Balance at End of Period	$ 1,944	$ 1,255