Allowance for Credit Losses - Summary of Allowance for Credit Losses (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 6,996
Charge-offs	(6,023)
Recoveries	787
Net (Charge-offs)/Recoveries	(5,236)
Provision for credit losses	5,649
Balance at End of Period	61,409
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	33,707
Charge-offs	(1)
Recoveries	122
Net (Charge-offs)/Recoveries	121
Provision for credit losses	1,075
Balance at End of Period	34,903
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	11,596
Charge-offs	(5,477)
Recoveries	417
Net (Charge-offs)/Recoveries	(5,060)
Provision for credit losses	5,460
Balance at End of Period	11,996
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	7,983
Charge-offs	0
Recoveries	0
Net (Charge-offs)/Recoveries	0
Provision for credit losses	(1,226)
Balance at End of Period	6,757
Consumer real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	6,187
Charge-offs	(162)
Recoveries	148
Net (Charge-offs)/Recoveries	(14)
Provision for credit losses	5
Balance at End of Period	6,178
Other consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	1,494
Charge-offs	(425)
Recoveries	169
Net (Charge-offs)/Recoveries	(256)
Provision for credit losses	249
Balance at End of Period	$ 1,487