Allowance for Loan and Lease Losses and Credit Quality - Summary of TDR Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	$ 107,141	$ 127,166
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	12,021	18,818
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	95,120	108,348
Accruing TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	85,904	98,459
Accruing TDR Loans | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	10,068	12,665
Accruing TDR Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	75,836	85,794
Nonaccrual TDR Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	21,237	28,707
Nonaccrual TDR Loans | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	1,953	6,153
Nonaccrual TDR Loans | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDR loans	$ 19,284	$ 22,554