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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Financing Receivables [Line Items]
Recorded Investment	$ 30,786	$ 36,996	$ 30,786	$ 36,996	$ 35,862
Unpaid Principal Balance	33,276	39,211	33,276	39,211	39,026
Related Allowance	826	2,843	826	2,843	1,803
Average Recorded Investment	31,358	37,064	33,502	39,105	38,404
Recognized Interest Income	311	435	948	1,138	1,465
With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	21,216	26,475	21,216	26,475	26,313
Unpaid Principal Balance	23,313	28,201	23,313	28,201	29,077
Related Allowance	0	0	0	0	0
Average Recorded Investment	21,420	25,158	23,408	26,994	26,926
Recognized Interest Income	215	305	630	796	1,078
With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	9,570	10,521	9,570	10,521	9,549
Unpaid Principal Balance	9,963	11,010	9,963	11,010	9,949
Related Allowance	826	2,843	826	2,843	1,803
Average Recorded Investment	9,938	11,906	10,094	12,111	11,478
Recognized Interest Income	96	130	318	342	387
Commercial real estate
Schedule of Financing Receivables [Line Items]
Recorded Investment	11,228	14,418	11,228	14,418	13,304
Unpaid Principal Balance	11,776	15,135	11,776	15,135	14,212
Related Allowance	71	1,041	71	1,041	346
Average Recorded Investment	11,604	14,537	12,379	14,217	14,120
Recognized Interest Income	102	147	355	429	550
Commercial real estate | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	7,976	12,509	7,976	12,509	11,687
Unpaid Principal Balance	8,444	13,064	8,444	13,064	12,423
Related Allowance	0	0	0	0	0
Average Recorded Investment	8,310	11,183	9,410	10,700	11,080
Recognized Interest Income	65	123	247	362	488
Commercial real estate | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	3,252	1,909	3,252	1,909	1,617
Unpaid Principal Balance	3,332	2,071	3,332	2,071	1,789
Related Allowance	71	1,041	71	1,041	346
Average Recorded Investment	3,294	3,354	2,969	3,517	3,040
Recognized Interest Income	37	24	108	67	62
Commercial construction
Schedule of Financing Receivables [Line Items]
Recorded Investment	996	1,380	996	1,380	1,380
Unpaid Principal Balance	996	1,380	996	1,380	1,380
Related Allowance	282	411	282	411	413
Average Recorded Investment	996	1,455	1,206	1,285	1,309
Recognized Interest Income	13	14	38	42	56
Commercial 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	40	30
Recognized Interest Income	0	0	0	0	0
Commercial construction | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	996	1,380	996	1,380	1,380
Unpaid Principal Balance	996	1,380	996	1,380	1,380
Related Allowance	282	411	282	411	413
Average Recorded Investment	996	1,455	1,206	1,245	1,279
Recognized Interest Income	13	14	38	42	56
Commercial other
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,736	3,892	1,736	3,892	2,942
Unpaid Principal Balance	1,811	4,208	1,811	4,208	3,745
Related Allowance	8	660	8	660	129
Average Recorded Investment	1,850	4,099	2,394	5,473	4,956
Recognized Interest Income	34	95	80	163	169
Commercial other | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,660	3,029	1,660	3,029	2,616
Unpaid Principal Balance	1,728	3,255	1,728	3,255	3,407
Related Allowance	0	0	0	0	0
Average Recorded Investment	1,698	3,071	2,077	4,221	3,853
Recognized Interest Income	34	66	76	125	156
Commercial other | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	76	863	76	863	326
Unpaid Principal Balance	83	953	83	953	338
Related Allowance	8	660	8	660	129
Average Recorded Investment	152	1,028	317	1,252	1,103
Recognized Interest Income	0	29	4	38	13
Residential term
Schedule of Financing Receivables [Line Items]
Recorded Investment	15,276	15,896	15,276	15,896	16,123
Unpaid Principal Balance	16,491	16,839	16,491	16,839	17,337
Related Allowance	435	661	435	661	519
Average Recorded Investment	15,281	15,539	15,857	16,309	16,243
Recognized Interest Income	141	169	434	479	641
Residential term | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	10,096	9,777	10,096	9,777	10,820
Unpaid Principal Balance	11,006	10,488	11,006	10,488	11,824
Related Allowance	0	0	0	0	0
Average Recorded Investment	9,852	9,746	10,482	10,478	10,505
Recognized Interest Income	95	107	268	286	402
Residential term | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	5,180	6,119	5,180	6,119	5,303
Unpaid Principal Balance	5,485	6,351	5,485	6,351	5,513
Related Allowance	435	661	435	661	519
Average Recorded Investment	5,429	5,793	5,375	5,831	5,738
Recognized Interest Income	46	62	166	193	239
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	1,550	1,384	1,550	1,384	2,087
Unpaid Principal Balance	2,202	1,621	2,202	1,621	2,324
Related Allowance	30	70	30	70	396
Average Recorded Investment	1,565	1,416	1,610	1,815	1,765
Recognized Interest Income	21	8	38	23	46
Home equity line of credit | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,484	1,134	1,484	1,134	1,164
Unpaid Principal Balance	2,135	1,366	2,135	1,366	1,395
Related Allowance	0	0	0	0	0
Average Recorded Investment	1,498	1,140	1,383	1,549	1,447
Recognized Interest Income	21	7	36	21	29
Home equity line of credit | With an Allowance Recorded
Schedule of Financing Receivables [Line Items]
Recorded Investment	66	250	66	250	923
Unpaid Principal Balance	67	255	67	255	929
Related Allowance	30	70	30	70	396
Average Recorded Investment	67	276	227	266	318
Recognized Interest Income	0	1	2	2	17
Consumer
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	26	0	26	26
Unpaid Principal Balance	0	28	0	28	28
Related Allowance	0	0	0	0	0
Average Recorded Investment	62	18	56	6	11
Recognized Interest Income	0	2	3	2	3
Consumer | With No Related Allowance
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	26	0	26	26
Unpaid Principal Balance	0	28	0	28	28
Related Allowance	0	0	0	0	0
Average Recorded Investment	62	18	56	6	11
Recognized Interest Income	0	2	3	2	3
Consumer | 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

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