Loans - Summary of TDRs (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 80,941	$ 93,066
Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	61,010	70,785
Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	19,931	22,281
Accruing TDRs
Financing Receivable, Modifications [Line Items]
Total TDRs	55,236	62,535
Accruing TDRs | Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	39,714	45,388
Accruing TDRs | Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	15,522	17,147
Nonaccrual TDRs
Financing Receivable, Modifications [Line Items]
Total TDRs	25,705	30,531
Nonaccrual TDRs | Commercial loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	21,296	25,397
Nonaccrual TDRs | Consumer loan portfolio
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 4,409	$ 5,134