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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Financing Receivables [Line Items]
Recorded Investment	$ 28,610	$ 34,833	$ 29,531
Unpaid Principal Balance	31,078	38,244	31,906
Related Allowance	599	1,436	754
Average Recorded Investment	28,973	35,121	32,698
Recognized Interest Income	275	311	1,220
With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	20,544	23,990	20,889
Unpaid Principal Balance	22,651	26,136	22,947
Related Allowance	0	0	0
Average Recorded Investment	20,490	25,806	22,808
Recognized Interest Income	187	213	839
With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	8,066	10,843	8,642
Unpaid Principal Balance	8,427	12,108	8,959
Related Allowance	599	1,436	754
Average Recorded Investment	8,483	9,315	9,890
Recognized Interest Income	88	98	381
Commercial real estate
Schedule of Financing Receivables [Line Items]
Recorded Investment	10,510	12,705	10,717
Unpaid Principal Balance	10,925	13,451	11,123
Related Allowance	69	248	89
Average Recorded Investment	10,620	12,895	12,056
Recognized Interest Income	115	120	450
Commercial real estate | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	7,381	9,062	7,173
Unpaid Principal Balance	7,712	9,496	7,496
Related Allowance	0	0	0
Average Recorded Investment	7,221	10,899	8,990
Recognized Interest Income	79	88	301
Commercial real estate | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	3,129	3,643	3,544
Unpaid Principal Balance	3,213	3,955	3,627
Related Allowance	69	248	89
Average Recorded Investment	3,399	1,996	3,066
Recognized Interest Income	36	32	149
Commercial construction
Schedule of Financing Receivables [Line Items]
Recorded Investment	967	1,380	1,026
Unpaid Principal Balance	1,026	1,380	1,026
Related Allowance	96	396	302
Average Recorded Investment	1,006	1,372	1,156
Recognized Interest Income	9	13	45
Commercial construction | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	179	0	30
Unpaid Principal Balance	238	0	30
Related Allowance	0	0	0
Average Recorded Investment	80	0	3
Recognized Interest Income	1	0	1
Commercial construction | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	788	1,380	996
Unpaid Principal Balance	788	1,380	996
Related Allowance	96	396	302
Average Recorded Investment	926	1,372	1,153
Recognized Interest Income	8	13	44
Commercial other
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,185	2,721	1,234
Unpaid Principal Balance	1,233	3,526	1,287
Related Allowance	21	347	8
Average Recorded Investment	1,201	2,792	2,149
Recognized Interest Income	8	16	81
Commercial other | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,097	2,305	1,163
Unpaid Principal Balance	1,137	2,411	1,210
Related Allowance	0	0	0
Average Recorded Investment	1,121	2,465	1,893
Recognized Interest Income	8	16	76
Commercial other | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	88	416	71
Unpaid Principal Balance	96	1,115	77
Related Allowance	21	347	8
Average Recorded Investment	80	327	256
Recognized Interest Income	0	0	5
Municipal
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	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
Unpaid Principal Balance	0	0	0
Related Allowance	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
Unpaid Principal Balance	0	0	0
Related Allowance	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	14,540	16,348	15,088
Unpaid Principal Balance	15,806	17,606	16,350
Related Allowance	384	421	326
Average Recorded Investment	14,710	16,369	15,708
Recognized Interest Income	134	153	595
Residential term | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	10,543	11,235	11,122
Unpaid Principal Balance	11,541	12,243	12,157
Related Allowance	0	0	0
Average Recorded Investment	10,715	11,136	10,480
Recognized Interest Income	91	100	415
Residential term | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	3,997	5,113	3,966
Unpaid Principal Balance	4,265	5,363	4,193
Related Allowance	384	421	326
Average Recorded Investment	3,995	5,233	5,228
Recognized Interest Income	43	53	180
Residential construction
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Investment	0	0	0
Recognized Interest Income	0	0	0
Residential construction | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Investment	0	0	0
Recognized Interest Income	0	0	0
Residential construction | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Investment	0	0	0
Recognized Interest Income	0	0	0
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,408	1,654	1,466
Unpaid Principal Balance	2,088	2,253	2,120
Related Allowance	29	24	29
Average Recorded Investment	1,436	1,668	1,587
Recognized Interest Income	9	8	46
Home equity line of credit | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,344	1,363	1,401
Unpaid Principal Balance	2,023	1,958	2,054
Related Allowance	0	0	0
Average Recorded Investment	1,353	1,281	1,400
Recognized Interest Income	8	8	43
Home equity line of credit | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	64	291	65
Unpaid Principal Balance	65	295	66
Related Allowance	29	24	29
Average Recorded Investment	83	387	187
Recognized Interest Income	1	0	3
Consumer
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	25	0
Unpaid Principal Balance	0	28	0
Related Allowance	0	0	0
Average Recorded Investment	0	25	42
Recognized Interest Income	0	1	3
Consumer | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	25	0
Unpaid Principal Balance	0	28	0
Related Allowance	0	0	0
Average Recorded Investment	0	25	42
Recognized Interest Income	0	1	3
Consumer | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Investment	0	0	0
Recognized Interest Income	$ 0	$ 0	$ 0

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