Loans (Impaired Financing Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Unpaid contractual principal balance	$ 36,685	$ 39,906
Recorded investment with no allowance	26,436	35,171
Recorded investment with allowance	8,924	4,066
Total recorded investment	35,360	39,237
Related allowance	1,289	1,608
Average recorded investment	36,534	39,942
Interest income recognized	1,309	1,366
Commercial Real Estate Portfolio Segment [Member]
Unpaid contractual principal balance	22,195	21,477
Recorded investment with no allowance	14,896	19,081
Recorded investment with allowance	7,081	2,367
Total recorded investment	21,977	21,448
Related allowance	806	601
Average recorded investment	22,303	21,786
Interest income recognized	908	774
Residential First Mortgages Portfolio Segment [Member]
Unpaid contractual principal balance	2,436	4,226
Recorded investment with no allowance	1,938	3,730
Recorded investment with allowance	475	495
Total recorded investment	2,413	4,225
Related allowance	7	27
Average recorded investment	2,445	4,276
Interest income recognized	90	141
Residential Rentals Portfolio Segment [Member]
Unpaid contractual principal balance	3,440	4,473
Recorded investment with no allowance	2,850	3,893
Recorded investment with allowance	178	181
Total recorded investment	3,028	4,074
Related allowance	36	40
Average recorded investment	3,486	4,400
Interest income recognized	134	170
Construction And Land Development Portfolio Segment [Member]
Unpaid contractual principal balance	4,304	4,283
Recorded investment with no allowance	2,926	3,780
Recorded investment with allowance	851	504
Total recorded investment	3,777	4,284
Related allowance	178	471
Average recorded investment	3,867	4,302
Interest income recognized	16	13
Home Equity And Second Mortgages Portfolio Segment [Member]
Unpaid contractual principal balance	170	154
Recorded investment with no allowance	170	154
Total recorded investment	170	154
Average recorded investment	176	163
Interest income recognized	7	8
Commercial Portfolio Segment [Member]
Unpaid contractual principal balance	3,285	4,775
Recorded investment with no allowance	3,004	4,195
Recorded investment with allowance	200	380
Total recorded investment	3,204	4,575
Related allowance	123	330
Average recorded investment	3,442	4,524
Interest income recognized	137	251
Commercial Equipment Portfolio Segment [Member]
Unpaid contractual principal balance	855	518
Recorded investment with no allowance	652	338
Recorded investment with allowance	139	139
Total recorded investment	791	477
Related allowance	139	139
Average recorded investment	815	491
Interest income recognized	$ 17	$ 9

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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