Loans and Loans Held for Sale - Restructured Loans for Periods Stated (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	53	60
Pre-Modification Outstanding Recorded Investment	$ 14,074	$ 8,290
Post-Modification Outstanding Recorded Investment	12,192	6,338
Total Difference in Recorded Investment	$ (1,882)	$ (1,952)
Principal Deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	8
Pre-Modification Outstanding Recorded Investment	$ 4,305	$ 3,512
Post-Modification Outstanding Recorded Investment	4,164	2,204
Total Difference in Recorded Investment	$ (141)	$ (1,308)
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 250
Post-Modification Outstanding Recorded Investment	242
Total Difference in Recorded Investment	$ (8)
Maturity Date Extension and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	4
Pre-Modification Outstanding Recorded Investment	$ 884	$ 410
Post-Modification Outstanding Recorded Investment	877	406
Total Difference in Recorded Investment	$ (7)	$ (4)
Maturity Date Extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	13	17
Pre-Modification Outstanding Recorded Investment	$ 6,795	$ 3,312
Post-Modification Outstanding Recorded Investment	5,197	2,922
Total Difference in Recorded Investment	$ (1,598)	$ (390)
Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	29	31
Pre-Modification Outstanding Recorded Investment	$ 1,840	$ 1,056
Post-Modification Outstanding Recorded Investment	1,712	806
Total Difference in Recorded Investment	$ (128)	$ (250)
Commercial Real Estate | Principal Deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		2
Pre-Modification Outstanding Recorded Investment		$ 2,851
Post-Modification Outstanding Recorded Investment		1,841
Total Difference in Recorded Investment		$ (1,010)
Commercial Real Estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 250
Post-Modification Outstanding Recorded Investment	242
Total Difference in Recorded Investment	$ (8)
Commercial Real Estate | Maturity Date Extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan		3
Pre-Modification Outstanding Recorded Investment		$ 438
Post-Modification Outstanding Recorded Investment		427
Total Difference in Recorded Investment		$ (11)
Commercial Real Estate | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 709
Post-Modification Outstanding Recorded Investment	646
Total Difference in Recorded Investment	$ (63)
Commercial and Industrial | Principal Deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	6
Pre-Modification Outstanding Recorded Investment	$ 985	$ 661
Post-Modification Outstanding Recorded Investment	986	363
Total Difference in Recorded Investment	$ 1	$ (298)
Commercial and Industrial | Maturity Date Extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	2
Pre-Modification Outstanding Recorded Investment	$ 4,756	$ 824
Post-Modification Outstanding Recorded Investment	3,334	728
Total Difference in Recorded Investment	$ (1,422)	$ (96)
Commercial Construction | Maturity Date Extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	3
Pre-Modification Outstanding Recorded Investment	$ 1,251	$ 1,434
Post-Modification Outstanding Recorded Investment	1,151	1,432
Total Difference in Recorded Investment	$ (100)	$ (2)
Residential Mortgage | Principal Deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 3,273
Post-Modification Outstanding Recorded Investment	3,133
Total Difference in Recorded Investment	$ (140)
Residential Mortgage | Maturity Date Extension and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	1
Pre-Modification Outstanding Recorded Investment	$ 280	$ 207
Post-Modification Outstanding Recorded Investment	279	205
Total Difference in Recorded Investment	$ (1)	$ (2)
Residential Mortgage | Maturity Date Extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	8
Pre-Modification Outstanding Recorded Investment	$ 483	$ 545
Post-Modification Outstanding Recorded Investment	414	265
Total Difference in Recorded Investment	$ (69)	$ (280)
Residential Mortgage | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	7
Pre-Modification Outstanding Recorded Investment	$ 439	$ 428
Post-Modification Outstanding Recorded Investment	413	226
Total Difference in Recorded Investment	$ (26)	$ (202)
Home Equity | Principal Deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1
Pre-Modification Outstanding Recorded Investment	$ 47
Post-Modification Outstanding Recorded Investment	45
Total Difference in Recorded Investment	$ (2)
Home Equity | Maturity Date Extension and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	3
Pre-Modification Outstanding Recorded Investment	$ 604	$ 203
Post-Modification Outstanding Recorded Investment	598	201
Total Difference in Recorded Investment	$ (6)	$ (2)
Home Equity | Maturity Date Extension
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	1
Pre-Modification Outstanding Recorded Investment	$ 305	$ 71
Post-Modification Outstanding Recorded Investment	298	70
Total Difference in Recorded Investment	$ (7)	$ (1)
Home Equity | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	19	23
Pre-Modification Outstanding Recorded Investment	$ 676	$ 619
Post-Modification Outstanding Recorded Investment	643	576
Total Difference in Recorded Investment	$ (33)	$ (43)
Installment and Other Consumer | Chapter 7 Bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2	1
Pre-Modification Outstanding Recorded Investment	$ 16	$ 9
Post-Modification Outstanding Recorded Investment	10	4
Total Difference in Recorded Investment	$ (6)	$ (5)