Loans - Summary of TDRs (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 77,776	$ 73,655
Commercial loan portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	62,075	56,851
Consumer loan portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	15,701	16,804
Accruing TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	47,853	45,580
Accruing TDRs | Commercial loan portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	35,549	32,508
Accruing TDRs | Consumer loan portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	12,304	13,072
Nonaccrual TDRs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	29,923	28,075
Nonaccrual TDRs | Commercial loan portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	26,526	24,343
Nonaccrual TDRs | Consumer loan portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 3,397	$ 3,732