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Loans and Allowance for loan losses (Allowance For Loan Losses And Recorded Investment In Loans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan Losses: Beginning Balance |  | $ 4,790 | $ 5,186
Allowance for Loan Losses: Charge-offs |  | (615) | (551)
Allowance for Loan Losses: Recoveries |  | 226 | 100
Allowance for Loan losses: Provision |  | 282 | 55
Allowance for Loan Losses: Ending Balance |  | 4,683 | 4,790
Allowance for Loan Losses: Ending Balance: Individually evaluated for impairment |  | 1,294 | 1,058
Allowance for Loan Losses: Ending Balance: Collectively evaluated for impairment |  | 3,389 | 3,732
Allowance for Loan Losses: Totals |  | 4,683 | 4,790
Financing Receivables: Ending Balance: Individually evaluated for impairment |  | 9,414 | 10,677
Financing Receivables: Ending Balance: Collectively evaluated for impairment |  | 425,714 | 388,686
Total loans | [1] | 435,128 | 399,363
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan Losses: Beginning Balance |  | 1,235 | 1,015
Allowance for Loan Losses: Charge-offs |  | (294) | (165)
Allowance for Loan Losses: Recoveries |  | 14 | 51
Allowance for Loan losses: Provision |  | 240 | 334
Allowance for Loan Losses: Ending Balance |  | 1,195 | 1,235
Allowance for Loan Losses: Ending Balance: Individually evaluated for impairment |  | 610 | 713
Allowance for Loan Losses: Ending Balance: Collectively evaluated for impairment |  | 585 | 522
Allowance for Loan Losses: Totals |  | 1,195 | 1,235
Financing Receivables: Ending Balance: Individually evaluated for impairment |  | 1,180 | 3,423
Financing Receivables: Ending Balance: Collectively evaluated for impairment |  | 75,593 | 59,386
Total loans |  | 76,773 | 63,259
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan Losses: Beginning Balance |  | 2,194 | 2,631
Allowance for Loan Losses: Charge-offs |  | (64) | (187)
Allowance for Loan Losses: Recoveries |  | 122 | 10
Allowance for Loan losses: Provision |  | (501) | (260)
Allowance for Loan Losses: Ending Balance |  | 1,751 | 2,194
Allowance for Loan Losses: Ending Balance: Individually evaluated for impairment |  | 413 | 95
Allowance for Loan Losses: Ending Balance: Collectively evaluated for impairment |  | 1,338 | 2,099
Allowance for Loan Losses: Totals |  | 1,751 | 2,194
Financing Receivables: Ending Balance: Individually evaluated for impairment |  | 5,175 | 5,351
Financing Receivables: Ending Balance: Collectively evaluated for impairment |  | 211,950 | 201,911
Total loans |  | 217,125 | 207,262
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan Losses: Beginning Balance |  | 812 | 935
Allowance for Loan Losses: Charge-offs |  | (257) | (79)
Allowance for Loan Losses: Recoveries |  | 54 | 39
Allowance for Loan losses: Provision |  | 464 | (83)
Allowance for Loan Losses: Ending Balance |  | 1,073 | 812
Allowance for Loan Losses: Ending Balance: Individually evaluated for impairment |  | 184 | 119
Allowance for Loan Losses: Ending Balance: Collectively evaluated for impairment |  | 889 | 693
Allowance for Loan Losses: Totals |  | 1,073 | 812
Financing Receivables: Ending Balance: Individually evaluated for impairment |  | 241 | 140
Financing Receivables: Ending Balance: Collectively evaluated for impairment |  | 81,290 | 76,240
Total loans |  | 81,531 | 76,380
Residential [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for Loan Losses: Beginning Balance |  | 549 | 605
Allowance for Loan Losses: Charge-offs |  |  | (120)
Allowance for Loan Losses: Recoveries |  | 36 |
Allowance for Loan losses: Provision |  | 79 | 64
Allowance for Loan Losses: Ending Balance |  | 664 | 549
Allowance for Loan Losses: Ending Balance: Individually evaluated for impairment |  | 87 | 131
Allowance for Loan Losses: Ending Balance: Collectively evaluated for impairment |  | 577 | 418
Allowance for Loan Losses: Totals |  | 664 | 549
Financing Receivables: Ending Balance: Individually evaluated for impairment |  | 2,818 | 1,763
Financing Receivables: Ending Balance: Collectively evaluated for impairment |  | 56,881 | 50,699
Total loans |  | $ 59,699 | $ 52,462
[1] | Includes net deferred loan costs of $263 and $330, respectively.

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 + Details
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