Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) Loan	Sep. 30, 2016 USD ($) Loan	Sep. 30, 2017 USD ($) Loan	Sep. 30, 2016 USD ($) Loan	Dec. 31, 2016 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	7	2	25	45	43
Post-Modification Outstanding Balance	$ 397	$ 152	$ 2,722	$ 13,070	$ 16,152
Commitment to extend additional credit on loans modified in TDRs	$ 100		$ 100
Defaulted restructured loans, number of loans | Loan	3	2	3	4
Defaulted restructured loans, recorded balance	$ 1,807	$ 1,460	$ 1,807	$ 2,328
Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	397	152	2,280	12,210	15,203
Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0	0	0	0
Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	$ 0	$ 0	$ 442	$ 860	$ 949
Commercial [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			2	5	1
Post-Modification Outstanding Balance			$ 114	$ 1,408	$ 1,288
Commercial [Member] | Construction [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			0	1,408	1,288
Commercial [Member] | Construction [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			0	0	0
Commercial [Member] | Construction [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			$ 114	$ 0	$ 0
Commercial [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	6	2	11	23	27
Post-Modification Outstanding Balance	$ 295	$ 152	$ 1,066	$ 6,341	$ 9,408
Defaulted restructured loans, number of loans | Loan	2	1	2	2
Defaulted restructured loans, recorded balance	$ 961	$ 1,446	$ 961	$ 1,956
Commercial [Member] | Real Estate [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	295	152	874	5,761	8,827
Commercial [Member] | Real Estate [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0	0	0	0
Commercial [Member] | Real Estate [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	$ 0	$ 0	$ 192	$ 580	$ 581
Commercial [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	1		10	16	14
Post-Modification Outstanding Balance	$ 102		$ 373	$ 5,041	$ 5,175
Defaulted restructured loans, number of loans | Loan		1		2
Defaulted restructured loans, recorded balance		$ 14		$ 372
Commercial [Member] | Other [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	102		237	5,041	5,088
Commercial [Member] | Other [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0		0	0	0
Commercial [Member] | Other [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	$ 0		$ 136	$ 0	$ 87
Residential [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			1
Post-Modification Outstanding Balance			$ 846
Defaulted restructured loans, number of loans | Loan			1
Defaulted restructured loans, recorded balance			$ 846
Residential [Member] | Construction [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			846
Residential [Member] | Construction [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			0
Residential [Member] | Construction [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			$ 0
Residential [Member] | Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan			1	1	1
Post-Modification Outstanding Balance			$ 323	$ 280	$ 281
Defaulted restructured loans, number of loans | Loan	1
Defaulted restructured loans, recorded balance	$ 846
Residential [Member] | Real Estate [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			323	0	0
Residential [Member] | Real Estate [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			0	0	0
Residential [Member] | Real Estate [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance			$ 0	$ 280	$ 281