Loans and Loans Held for Sale - Restructured Loans for Periods Presented (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Restructured loans	$ 12,192	$ 6,338
Performing TDRs
Financing Receivable, Modifications [Line Items]
Restructured loans	13,423	23,955
Performing TDRs | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Restructured loans	2,994	6,822
Performing TDRs | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Restructured loans	1,387	6,321
Performing TDRs | Commercial Construction
Financing Receivable, Modifications [Line Items]
Restructured loans	2,966	5,013
Performing TDRs | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans	2,375	2,590
Performing TDRs | Home Equity
Financing Receivable, Modifications [Line Items]
Restructured loans	3,683	3,184
Performing TDRs | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Restructured loans	18	25
Nonperforming TDRs
Financing Receivable, Modifications [Line Items]
Restructured loans	11,598	7,659
Nonperforming TDRs | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Restructured loans	646	3,548
Nonperforming TDRs | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Restructured loans	4,493	1,570
Nonperforming TDRs | Commercial Construction
Financing Receivable, Modifications [Line Items]
Restructured loans	430	1,265
Nonperforming TDRs | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans	5,068	665
Nonperforming TDRs | Home Equity
Financing Receivable, Modifications [Line Items]
Restructured loans	954	523
Nonperforming TDRs | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Restructured loans	7	88
Total TDRs
Financing Receivable, Modifications [Line Items]
Restructured loans	25,021	31,614
Total TDRs | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Restructured loans	3,640	10,370
Total TDRs | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Restructured loans	5,880	7,891
Total TDRs | Commercial Construction
Financing Receivable, Modifications [Line Items]
Restructured loans	3,396	6,278
Total TDRs | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans	7,443	3,255
Total TDRs | Home Equity
Financing Receivable, Modifications [Line Items]
Restructured loans	4,637	3,707
Total TDRs | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Restructured loans	$ 25	$ 113