Loans (Impaired Financing Receivables) (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
Unpaid contractual principal balance	$ 39,330	$ 43,469	$ 39,330	$ 43,469	$ 39,906
Recorded investment with no allowance	34,727	38,464	34,727	38,464	35,171
Recorded investment with allowance	3,757	4,739	3,757	4,739	4,066
Total recorded investment	38,484	43,203	38,484	43,203	39,237
Related allowance	1,223	1,473	1,223	1,473	1,608
Average recorded investment	38,723	43,354	38,962	43,334	39,942
Interest income recognized	354	328	627	697	1,366
Commercial Loans [Member]
Unpaid contractual principal balance	4,551	5,184	4,551	5,184	4,775
Recorded investment with no allowance	4,222	4,499	4,222	4,499	4,195
Recorded investment with allowance	5	581	5	581	380
Total recorded investment	4,227	5,080	4,227	5,080	4,575
Related allowance	5	227	5	227	330
Average recorded investment	4,237	5,041	4,238	5,034	4,524
Interest income recognized	36	44	69	96	251
Commercial Equipment [Member]
Unpaid contractual principal balance	839	1,462	839	1,462	518
Recorded investment with no allowance	623	292	623	292	338
Recorded investment with allowance	193	1,097	193	1,097	139
Total recorded investment	816	1,389	816	1,389	477
Related allowance	165	1,021	165	1,021	139
Average recorded investment	828	1,401	840	1,407	491
Interest income recognized	5	12	11	26	9
Home Equity and Second Mortgage [Member]
Unpaid contractual principal balance	109	488	109	488	154
Recorded investment with no allowance	109	429	109	429	154
Total recorded investment	109	429	109	429	154
Average recorded investment	109	434	108	437	163
Interest income recognized	1	2	2	6	8
Construction and Land Development [Member]
Unpaid contractual principal balance	4,443	4,329	4,443	4,329	4,283
Recorded investment with no allowance	3,939	4,329	3,939	4,329	3,780
Recorded investment with allowance	431		431		504
Total recorded investment	4,370	4,329	4,370	4,329	4,284
Related allowance	398		398		471
Average recorded investment	4,317	4,382	4,264	4,285	4,302
Interest income recognized	4	4	7	7	13
Residential Rentals [Member]
Unpaid contractual principal balance	3,987	7,893	3,987	7,893	4,473
Recorded investment with no allowance	3,352	7,436	3,352	7,436	3,893
Recorded investment with allowance	239	457	239	457	181
Total recorded investment	3,591	7,893	3,591	7,893	4,074
Related allowance	53	17	53	17	40
Average recorded investment	3,747	7,904	3,798	7,926	4,400
Interest income recognized	42	71	67	147	170
Residential First Mortgages [Member]
Unpaid contractual principal balance	2,957	3,465	2,957	3,465	4,226
Recorded investment with no allowance	2,472	2,960	2,472	2,960	3,730
Recorded investment with allowance	485	505	485	505	495
Total recorded investment	2,957	3,465	2,957	3,465	4,225
Related allowance	20	75	20	75	27
Average recorded investment	2,982	3,473	2,990	3,480	4,276
Interest income recognized	23	25	51	56	141
Commercial Real Estate [Member]
Unpaid contractual principal balance	22,444	20,648	22,444	20,648	21,477
Recorded investment with no allowance	20,010	18,519	20,010	18,519	19,081
Recorded investment with allowance	2,404	2,099	2,404	2,099	2,367
Total recorded investment	22,414	20,618	22,414	20,618	21,448
Related allowance	582	133	582	133	601
Average recorded investment	22,503	20,719	22,724	20,765	21,786
Interest income recognized	$ 243	$ 170	$ 420	$ 359	$ 774