Loans - Summary of TDRs (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 76,735	$ 73,655
Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	61,020	56,851
Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	15,715	16,804
Accruing TDRs
Financing Receivable, Modifications [Line Items]
Total TDRs	49,935	45,580
Accruing TDRs | Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	37,219	32,508
Accruing TDRs | Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	12,716	13,072
Nonaccrual TDRs
Financing Receivable, Modifications [Line Items]
Total TDRs	26,800	28,075
Nonaccrual TDRs | Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	23,801	24,343
Nonaccrual TDRs | Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 2,999	$ 3,732