Loans (Impaired Financing Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Unpaid contractual principal balance	$ 30,120	$ 39,330	$ 30,120	$ 39,330	$ 36,685
Recorded investment with no allowance	20,461	34,727	20,461	34,727	26,436
Recorded investment with allowance	9,244	3,757	9,244	3,757	8,924
Total recorded investment	29,705	38,484	29,705	38,484	35,360
Related allowance	1,476	1,223	1,476	1,223	1,289
Average recorded investment	29,859	38,723	30,018	38,962	36,534
Interest income recognized	280	354	588	627	1,309
Residential First Mortgage Loans [Member]
Unpaid contractual principal balance	2,294	2,957	2,294	2,957	2,436
Recorded investment with no allowance	1,823	2,472	1,823	2,472	1,938
Recorded investment with allowance	468	485	468	485	475
Total recorded investment	2,291	2,957	2,291	2,957	2,413
Related allowance	11	20	11	20	7
Average recorded investment	2,299	2,982	2,311	2,990	2,445
Interest income recognized	21	23	49	51	90
Home Equity And Second Mortgage Loans [Member]
Unpaid contractual principal balance	109	109	109	109	170
Recorded investment with no allowance	109	109	109	109	170
Total recorded investment	109	109	109	109	170
Average recorded investment	110	109	111	108	176
Interest income recognized	1	1	2	2	7
Commercial Portfolio Segment [Member] \| Commercial Real Estate Loans [Member]
Unpaid contractual principal balance	20,277	22,444	20,277	22,444	22,195
Recorded investment with no allowance	13,079	20,010	13,079	20,010	14,896
Recorded investment with allowance	6,987	2,404	6,987	2,404	7,081
Total recorded investment	20,066	22,414	20,066	22,414	21,977
Related allowance	693	582	693	582	806
Average recorded investment	20,186	22,503	20,274	22,724	22,303
Interest income recognized	198	243	417	420	908
Commercial Portfolio Segment [Member] \| Residential Rentals Loans [Member]
Unpaid contractual principal balance	2,758	3,987	2,758	3,987	3,440
Recorded investment with no allowance	2,286	3,352	2,286	3,352	2,850
Recorded investment with allowance	400	239	400	239	178
Total recorded investment	2,686	3,591	2,686	3,591	3,028
Related allowance	23	53	23	53	36
Average recorded investment	2,693	3,747	2,731	3,798	3,486
Interest income recognized	27	42	56	67	134
Commercial Portfolio Segment [Member] \| Construction And Land Development Loans [Member]
Unpaid contractual principal balance	981	4,443	981	4,443	4,304
Recorded investment with no allowance	252	3,939	252	3,939	2,926
Recorded investment with allowance	729	431	729	431	851
Total recorded investment	981	4,370	981	4,370	3,777
Related allowance	163	398	163	398	178
Average recorded investment	980	4,317	980	4,264	3,867
Interest income recognized	4	4	7	7	16
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Unpaid contractual principal balance	3,063	4,551	3,063	4,551	3,285
Recorded investment with no allowance	2,804	4,222	2,804	4,222	3,004
Recorded investment with allowance	169	5	169	5	200
Total recorded investment	2,973	4,227	2,973	4,227	3,204
Related allowance	169	5	169	5	123
Average recorded investment	2,974	4,237	2,986	4,238	3,442
Interest income recognized	23	36	46	69	137
Commercial Portfolio Segment [Member] \| Commercial Equipment Loans [Member]
Unpaid contractual principal balance	638	839	638	839	855
Recorded investment with no allowance	108	623	108	623	652
Recorded investment with allowance	491	193	491	193	139
Total recorded investment	599	816	599	816	791
Related allowance	417	165	417	165	139
Average recorded investment	617	828	625	840	815
Interest income recognized	$ 6	$ 5	$ 11	$ 11	$ 17

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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