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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Financing Receivables [Line Items]
Recorded Investment	$ 28,193	$ 32,748	$ 28,193	$ 32,748	$ 29,531
Unpaid Principal Balance	30,087	35,248	30,087	35,248	31,906
Related Allowance	1,029	1,307	1,029	1,307	754
Average Recorded Investment	28,080	34,025	28,526	34,573	32,698
Recognized Interest Income	282	335	557	637	1,220
With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	19,491	22,010	19,491	22,010	20,889
Unpaid Principal Balance	21,208	24,106	21,208	24,106	22,947
Related Allowance	0	0	0	0	0
Average Recorded Investment	19,672	22,998	20,080	24,401	22,808
Recognized Interest Income	202	218	389	415	839
With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	8,702	10,738	8,702	10,738	8,642
Unpaid Principal Balance	8,879	11,142	8,879	11,142	8,959
Related Allowance	1,029	1,307	1,029	1,307	754
Average Recorded Investment	8,408	11,027	8,446	10,172	9,890
Recognized Interest Income	80	117	168	222	381
Commercial real estate
Schedule of Financing Receivables [Line Items]
Recorded Investment	10,685	12,566	10,685	12,566	10,717
Unpaid Principal Balance	10,933	13,107	10,933	13,107	11,123
Related Allowance	369	225	369	225	89
Average Recorded Investment	10,434	12,638	10,526	12,766	12,056
Recognized Interest Income	101	132	216	253	450
Commercial real estate | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	6,654	8,986	6,654	8,986	7,173
Unpaid Principal Balance	6,817	9,436	6,817	9,436	7,496
Related Allowance	0	0	0	0	0
Average Recorded Investment	6,916	9,020	7,068	9,959	8,990
Recognized Interest Income	66	93	145	182	301
Commercial real estate | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	4,031	3,580	4,031	3,580	3,544
Unpaid Principal Balance	4,116	3,671	4,116	3,671	3,627
Related Allowance	369	225	369	225	89
Average Recorded Investment	3,518	3,618	3,458	2,807	3,066
Recognized Interest Income	35	39	71	71	149
Commercial construction
Schedule of Financing Receivables [Line Items]
Recorded Investment	834	989	834	989	1,026
Unpaid Principal Balance	834	989	834	989	1,026
Related Allowance	97	275	97	275	302
Average Recorded Investment	828	1,249	917	1,311	1,156
Recognized Interest Income	10	13	19	25	45
Commercial construction | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	46	0	46	0	30
Unpaid Principal Balance	46	0	46	0	30
Related Allowance	0	0	0	0	0
Average Recorded Investment	40	0	60	0	3
Recognized Interest Income	0	0	1	0	1
Commercial construction | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	788	989	788	989	996
Unpaid Principal Balance	788	989	788	989	996
Related Allowance	97	275	97	275	302
Average Recorded Investment	788	1,249	857	1,311	1,153
Recognized Interest Income	10	13	18	25	44
Commercial other
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,479	2,106	1,479	2,106	1,234
Unpaid Principal Balance	1,524	2,186	1,524	2,186	1,287
Related Allowance	158	275	158	275	8
Average Recorded Investment	1,382	2,540	1,292	2,666	2,149
Recognized Interest Income	25	30	33	46	81
Commercial other | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	955	1,789	955	1,789	1,163
Unpaid Principal Balance	994	1,855	994	1,855	1,210
Related Allowance	0	0	0	0	0
Average Recorded Investment	1,045	2,069	1,083	2,267	1,893
Recognized Interest Income	13	27	21	42	76
Commercial other | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	524	317	524	317	71
Unpaid Principal Balance	530	331	530	331	77
Related Allowance	158	275	158	275	8
Average Recorded Investment	337	471	209	399	256
Recognized Interest Income	12	3	12	4	5
Municipal
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Average Recorded Investment			0	0	0
Recognized Interest Income			0	0	0
Municipal | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Average Recorded Investment			0	0	0
Recognized Interest Income			0	0	0
Municipal | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Average Recorded Investment			0	0	0
Recognized Interest Income			0	0	0
Residential term
Schedule of Financing Receivables [Line Items]
Recorded Investment	14,105	15,420	14,105	15,420	15,088
Unpaid Principal Balance	15,351	16,619	15,351	16,619	16,350
Related Allowance	326	501	326	501	326
Average Recorded Investment	14,256	15,921	14,483	16,145	15,708
Recognized Interest Income	141	150	275	293	595
Residential term | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	10,924	9,636	10,924	9,636	11,122
Unpaid Principal Balance	12,085	10,537	12,085	10,537	12,157
Related Allowance	0	0	0	0	0
Average Recorded Investment	10,592	10,458	10,653	10,797	10,480
Recognized Interest Income	118	90	209	173	415
Residential term | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	3,181	5,784	3,181	5,784	3,966
Unpaid Principal Balance	3,266	6,082	3,266	6,082	4,193
Related Allowance	326	501	326	501	326
Average Recorded Investment	3,664	5,463	3,830	5,348	5,228
Recognized Interest Income	23	60	66	120	180
Residential construction
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Average Recorded Investment	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Residential construction | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Average Recorded Investment	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Residential construction | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Average Recorded Investment	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Recorded Investment	975	1,572	975	1,572	1,466
Unpaid Principal Balance	1,330	2,209	1,330	2,209	2,120
Related Allowance	28	31	28	31	29
Average Recorded Investment	1,142	1,597	1,289	1,633	1,587
Recognized Interest Income	5	8	14	17	46
Home equity line of credit | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	912	1,504	912	1,504	1,401
Unpaid Principal Balance	1,266	2,140	1,266	2,140	2,054
Related Allowance	0	0	0	0	0
Average Recorded Investment	1,079	1,371	1,216	1,326	1,400
Recognized Interest Income	5	8	13	15	43
Home equity line of credit | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	63	68	63	68	65
Unpaid Principal Balance	64	69	64	69	66
Related Allowance	28	31	28	31	29
Average Recorded Investment	63	226	73	307	187
Recognized Interest Income	0	0	1	2	3
Consumer
Schedule of Financing Receivables [Line Items]
Recorded Investment	115	95	115	95	0
Unpaid Principal Balance	115	138	115	138	0
Related Allowance	51	0	51	0	0
Average Recorded Investment	38	80	19	52	42
Recognized Interest Income	0	2	0	3	3
Consumer | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	95	0	95	0
Unpaid Principal Balance	0	138	0	138	0
Related Allowance	0	0	0	0	0
Average Recorded Investment	0	80	0	52	42
Recognized Interest Income	0	0	0	3	3
Consumer | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	115	0	115	0	0
Unpaid Principal Balance	115	0	115	0	0
Related Allowance	51	0	51	0	0
Average Recorded Investment	38	0	19	0	0
Recognized Interest Income	$ 0	$ 2	$ 0	$ 0	$ 0

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