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Loan and Allowance for Loan Losses (Tables) | 12 Months Ended
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Dec. 31, 2017
Loans And Leases Receivable Disclosure [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  |  |  |  |  |  | December 31
(In thousands) |  |  | 2017 |  |  | 2016
Commercial and industrial |  | $ | 59,086 |  | $ | 49,850
Construction and land development |  |  | 39,607 |  |  | 41,650
Commercial real estate: |  |  |  |  |  |
| Owner occupied |  |  | 44,192 |  |  | 49,745
| Multifamily |  |  | 52,167 |  |  | 46,998
| Other |  |  | 142,674 |  |  | 123,696
|  | Total commercial real estate |  |  | 239,033 |  |  | 220,439
Residential real estate: |  |  |  |  |  |
| Consumer mortgage |  |  | 59,540 |  |  | 65,564
| Investment property |  |  | 47,323 |  |  | 45,291
|  | Total residential real estate |  |  | 106,863 |  |  | 110,855
Consumer installment |  |  | 9,588 |  |  | 8,712
|  | Total loans |  |  | 454,177 |  |  | 431,506
Less: unearned income |  |  | (526) |  |  | (560)
|  | Loans, net of unearned income |  | $ | 453,651 |  | $ | 430,946
Past Due Financing Receivables [Table Text Block] |
|  |  |  |  |  |  |  |  | Accruing | Accruing | Total |  |  |  |
|  |  |  |  |  |  |  |  | 30-89 Days | Greater than | Accruing | Non- |  |  | Total
(In thousands) |  | Current | Past Due | 90 days | Loans | Accrual |  |  | Loans
December 31, 2017: |  |  |  |  |  |  |  |  |  |
Commercial and industrial |  | $ | 59,047 | 8 | — | 59,055 | 31 |  | $ | 59,086
Construction and land development |  |  | 39,607 | — | — | 39,607 | — |  |  | 39,607
Commercial real estate: |  |  |  |  |  |  |  |  |  |
| Owner occupied |  |  | 44,192 | — | — | 44,192 | — |  |  | 44,192
| Multifamily |  |  | 52,167 | — | — | 52,167 | — |  |  | 52,167
| Other |  |  | 140,486 | — | — | 140,486 | 2,188 |  |  | 142,674
|  | Total commercial real estate |  |  | 236,845 | — | — | 236,845 | 2,188 |  |  | 239,033
Residential real estate: |  |  |  |  |  |  |  |  |  |
| Consumer mortgage |  |  | 58,195 | 746 | — | 58,941 | 599 |  |  | 59,540
| Investment property |  |  | 46,871 | 312 | — | 47,183 | 140 |  |  | 47,323
|  | Total residential real estate |  |  | 105,066 | 1,058 | — | 106,124 | 739 |  |  | 106,863
Consumer installment |  |  | 9,517 | 57 | — | 9,574 | 14 |  |  | 9,588
|  | Total |  | $ | 450,082 | 1,123 | — | 451,205 | 2,972 |  | $ | 454,177
December 31, 2016: |  |  |  |  |  |  |  |  |  |
Commercial and industrial |  | $ | 49,747 | 66 | — | 49,813 | 37 |  | $ | 49,850
Construction and land development |  |  | 41,223 | 395 | — | 41,618 | 32 |  |  | 41,650
Commercial real estate: |  |  |  |  |  |  |  |  |  |
| Owner occupied |  |  | 49,564 | 43 | — | 49,607 | 138 |  |  | 49,745
| Multifamily |  |  | 46,998 | — | — | 46,998 | — |  |  | 46,998
| Other |  |  | 121,608 | 199 | — | 121,807 | 1,889 |  |  | 123,696
|  | Total commercial real estate |  |  | 218,170 | 242 | — | 218,412 | 2,027 |  |  | 220,439
Residential real estate: |  |  |  |  |  |  |  |  |  |
| Consumer mortgage |  |  | 64,059 | 1,282 | — | 65,341 | 223 |  |  | 65,564
| Investment property |  |  | 45,243 | 19 | — | 45,262 | 29 |  |  | 45,291
|  | Total residential real estate |  |  | 109,302 | 1,301 | — | 110,603 | 252 |  |  | 110,855
Consumer installment |  |  | 8,652 | 38 | — | 8,690 | 22 |  |  | 8,712
|  | Total |  | $ | 427,094 | 2,042 | — | 429,136 | 2,370 |  | $ | 431,506
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
|  |  | Year ended December 31
(In thousands) |  |  | 2017 |  |  | 2016
Beginning balance |  | $ | 4,643 |  | $ | 4,289
Charged-off loans |  |  | (596) |  |  | (540)
Recovery of previously charged-off loans |  |  | 1,010 |  |  | 1,379
| Net recoveries |  |  | 414 |  |  | 839
Provision for loan losses |  |  | (300) |  |  | (485)
Ending balance |  | $ | 4,757 |  | $ | 4,643
(in thousands) |  | Commercial and industrial |  | Construction and land Development |  | Commercial Real Estate |  | Residential Real Estate |  | Consumer Installment |  |  |  | Total
Balance, December 31, 2015 | $ | 523 |  | 669 |  | 1,879 |  | 1,059 |  | 159 |  |  | $ | 4,289
Charge-offs |  | (97) |  | — |  | (194) |  | (182) |  | (67) |  |  |  | (540)
Recoveries |  | 29 |  | 1,212 |  | — |  | 127 |  | 11 |  |  |  | 1,379
| Net (charge-offs) recoveries | (68) |  | 1,212 |  | (194) |  | (55) |  | (56) |  |  |  | 839
Provision |  | 85 |  | (1,069) |  | 386 |  | 103 |  | 10 |  |  |  | (485)
Balance, December 31, 2016 | $ | 540 |  | 812 |  | 2,071 |  | 1,107 |  | 113 |  |  | $ | 4,643
Charge-offs |  | (449) |  | — |  | — |  | (107) |  | (40) |  |  |  | (596)
Recoveries |  | 461 |  | 347 |  | — |  | 115 |  | 87 |  |  |  | 1,010
| Net recoveries | 12 |  | 347 |  | — |  | 8 |  | 47 |  |  |  | 414
Provision |  | 101 |  | (425) |  | 55 |  | (44) |  | 13 |  |  |  | (300)
Balance, December 31, 2017 | $ | 653 |  | 734 |  | 2,126 |  | 1,071 |  | 173 |  |  | $ | 4,757
Financing Receivable Allowance for Credit Loss Additional Information [Table Text Block] |
|  |  |  |  |  |  | Collectively evaluated (1) |  | Individually evaluated (2) |  | Total
|  |  |  |  |  |  | Allowance | Recorded |  | Allowance | Recorded |  | Allowance | Recorded
|  |  |  |  |  |  | for loan | investment |  | for loan | investment |  | for loan | investment
(In thousands) |  | losses | in loans |  | losses | in loans |  | losses | in loans
December 31, 2017: |  |  |  |  |  |  |  |  |
Commercial and industrial | $ | 622 | 59,055 |  | 31 | 31 |  | 653 | 59,086
Construction and land development |  | 734 | 39,607 |  | — | — |  | 734 | 39,607
Commercial real estate |  | 2,115 | 236,322 |  | 11 | 2,711 |  | 2,126 | 239,033
Residential real estate |  | 1,071 | 106,863 |  | — | — |  | 1,071 | 106,863
Consumer installment |  | 173 | 9,588 |  | — | — |  | 173 | 9,588
|  | Total | $ | 4,715 | 451,435 |  | 42 | 2,742 |  | 4,757 | 454,177
December 31, 2016: |  |  |  |  |  |  |  |  |
Commercial and industrial | $ | 540 | 49,835 |  | — | 15 |  | 540 | 49,850
Construction and land development |  | 812 | 41,618 |  | — | 32 |  | 812 | 41,650
Commercial real estate |  | 2,040 | 218,356 |  | 31 | 2,083 |  | 2,071 | 220,439
Residential real estate |  | 1,107 | 110,855 |  | — | — |  | 1,107 | 110,855
Consumer installment |  | 113 | 8,712 |  | — | — |  | 113 | 8,712
|  | Total | $ | 4,612 | 429,376 |  | 31 | 2,130 |  | 4,643 | 431,506
(1) Represents loans collectively evaluated for impairment in accordance with ASC 450-20, Loss Contingencies
| (formerly FAS 5), and pursuant to amendments by ASU 2010-20 regarding allowance for unimpaired loans.
(2) Represents loans individually evaluated for impairment in accordance with ASC 310-30, Receivables (formerly
| FAS 114), and pursuant to amendments by ASU 2010-20 regarding allowance for impaired loans.
Financing Receivable Credit Quality Indicators [Table Text Block] |
(In thousands) |  | Pass |  | Special Mention |  | Substandard Accruing |  | Nonaccrual |  |  | Total loans
December 31, 2017 |  |  |  |  |  |  |  |  |
Commercial and industrial | $ | 58,842 |  | 94 |  | 119 |  | 31 |  | $ | 59,086
Construction and land development |  | 39,049 |  | 90 |  | 468 |  | — |  |  | 39,607
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |
| Owner occupied |  | 43,615 |  | 240 |  | 337 |  | — |  |  | 44,192
| Multifamily |  | 52,167 |  | — |  | — |  | — |  |  | 52,167
| Other |  | 139,695 |  | 395 |  | 396 |  | 2,188 |  |  | 142,674
|  | Total commercial real estate |  | 235,477 |  | 635 |  | 733 |  | 2,188 |  |  | 239,033
Residential real estate: |  |  |  |  |  |  |  |  |  |  |
| Consumer mortgage |  | 54,101 |  | 1,254 |  | 3,586 |  | 599 |  |  | 59,540
| Investment property |  | 46,463 |  | 53 |  | 667 |  | 140 |  |  | 47,323
|  | Total residential real estate |  | 100,564 |  | 1,307 |  | 4,253 |  | 739 |  |  | 106,863
Consumer installment |  | 9,430 |  | 66 |  | 78 |  | 14 |  |  | 9,588
|  | Total | $ | 443,362 |  | 2,192 |  | 5,651 |  | 2,972 |  | $ | 454,177
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Commercial and industrial | $ | 49,558 |  | 22 |  | 233 |  | 37 |  | $ | 49,850
Construction and land development |  | 41,165 |  | 113 |  | 340 |  | 32 |  |  | 41,650
Commercial real estate: |  |  |  |  |  |  |  |  |  |  |
| Owner occupied |  | 48,788 |  | 414 |  | 405 |  | 138 |  |  | 49,745
| Multifamily |  | 46,998 |  | — |  | — |  | — |  |  | 46,998
| Other |  | 121,326 |  | 32 |  | 449 |  | 1,889 |  |  | 123,696
|  | Total commercial real estate |  | 217,112 |  | 446 |  | 854 |  | 2,027 |  |  | 220,439
Residential real estate: |  |  |  |  |  |  |  |  |  |  |
| Consumer mortgage |  | 59,450 |  | 2,613 |  | 3,278 |  | 223 |  |  | 65,564
| Investment property |  | 44,109 |  | 105 |  | 1,048 |  | 29 |  |  | 45,291
|  | Total residential real estate |  | 103,559 |  | 2,718 |  | 4,326 |  | 252 |  |  | 110,855
Consumer installment |  | 8,580 |  | 20 |  | 90 |  | 22 |  |  | 8,712
|  | Total | $ | 419,974 |  | 3,319 |  | 5,843 |  | 2,370 |  | $ | 431,506
Impaired Financing Receivables [Table Text Block] |
|  |  |  |  |  |  | December 31, 2017
(In thousands) |  | Unpaid principal balance (1) |  | Charge-offs and payments applied (2) |  | Recorded investment (3) |  |  | Related allowance
With no allowance recorded:
Commercial real estate: |  |  |  |  |  |  |  |  |
| Other |  | 3,630 |  | (1,094) |  | 2,536 |  |  |
|  | Total commercial real estate |  | 3,630 |  | (1,094) |  | 2,536 |  |  |
|  | Total | $ | 3,630 |  | (1,094) |  | 2,536 |
With allowance recorded: |
Commercial and industrial | $ | 52 |  | (21) |  | 31 |  | $ | 31
Commercial real estate: |  |  |  |  |  |  |  |  |
| Owner occupied |  | 175 |  | — |  | 175 |  |  | 11
|  | Total commercial real estate |  | 175 |  | — |  | 175 |  |  | 11
|  | Total | $ | 227 |  | (21) |  | 206 |  | $ | 42
|  | Total impaired loans | $ | 3,857 |  | (1,115) |  | 2,742 |  | $ | 42
(1) Unpaid principal balance represents the contractual obligation due from the customer.
(2) Charge-offs and payments applied represents cumulative charge-offs taken, as well as interest payments that have been
| applied against the outstanding principal balance.
(3) Recorded investment represents the unpaid principal balance less charge-offs and payments applied; it is shown before
| any related allowance for loan losses.
|  |  |  |  |  |  | December 31, 2016
(In thousands) |  | Unpaid principal balance (1) |  | Charge-offs and payments applied (2) |  | Recorded investment (3) |  |  | Related allowance
With no allowance recorded:
Commercial and industrial | $ | 15 |  | — |  | 15 |  |  |
Construction and land development |  | 140 |  | (108) |  | 32 |  |  |
Commercial real estate: |  |  |  |  |  |  |  |  |
| Other |  | 2,874 |  | (984) |  | 1,890 |  |  |
|  | Total commercial real estate |  | 2,874 |  | (984) |  | 1,890 |  |  |
|  | Total | $ | 3,029 |  | (1,092) |  | 1,937 |
With allowance recorded: |
Commercial real estate: |  |  |  |  |  |  |  |  |
| Owner occupied | $ | 193 |  | — |  | 193 |  | $ | 31
|  | Total commercial real estate |  | 193 |  | — |  | 193 |  |  | 31
|  | Total | $ | 193 |  | — |  | 193 |  | $ | 31
|  | Total impaired loans | $ | 3,222 |  | (1,092) |  | 2,130 |  | $ | 31
(1) Unpaid principal balance represents the contractual obligation due from the customer.
(2) Charge-offs and payments applied represents cumulative charge-offs taken, as well as interest payments that have been
| applied against the outstanding principal balance.
(3) Recorded investment represents the unpaid principal balance less charge-offs and payments applied; it is shown before
| any related allowance for loan losses.
Schedule Of Average Impaired Financing Receivable [Table Text Block] |
|  |  |  |  |  | Year ended December 31, 2017 |  | Year ended December 31, 2016
|  |  |  |  |  |  | Average |  | Total interest |  |  | Average |  | Total interest
|  |  |  |  |  |  | recorded |  | income |  |  | recorded |  | income
(In thousands) |  | investment |  | recognized |  |  | investment |  | recognized
Impaired loans:
Commercial and industrial | $ | 50 |  | — |  | $ | 31 |  | 2
Construction and land |  |  |  |  |  |  |  |  |
| development |  | 11 |  | — |  |  | 94 |  | —
Commercial real estate: |  |  |  |  |  |  |  |  |
| Owner occupied |  | 184 |  | 10 |  |  | 699 |  | 31
| Other |  | 2,096 |  | 1 |  |  | 1,687 |  | —
|  | Total commercial real estate |  | 2,280 |  | 11 |  |  | 2,386 |  | 31
|  | Total | $ | 2,341 |  | 11 |  | $ | 2,511 |  | 33
Troubled Debt Restructurings on Financing Receivables, Accrual Status [Table Text Block] |
|  |  |  |  |  |  | TDRs
|  |  |  |  |  |  |  |  |  |  |  | Related
(In thousands) |  | Accruing | Nonaccrual | Total |  |  | Allowance
December 31, 2017 |  |  |  |  |  |  |
Commercial and industrial | $ | — | 31 | 31 |  | $ | 31
Commercial real estate: |  |  |  |  |  |  |
| Owner occupied |  | 175 | — | 175 |  |  | 11
| Other |  | 287 | 1,431 | 1,718 |  |  | —
|  | Total commercial real estate |  | 462 | 1,431 | 1,893 |  |  | 11
|  | Total | $ | 462 | 1,462 | 1,924 |  | $ | 42
December 31, 2016 |  |  |  |  |  |  |
Commercial and industrial | $ | 15 | — | 15 |  | $ | —
Construction and land development |  | — | 32 | 32 |  |  | —
Commercial real estate: |  |  |  |  |  |  |
| Owner occupied |  | 193 | — | 193 |  |  | 31
| Other |  | — | 1,818 | 1,818 |  |  | —
|  | Total commercial real estate |  | 193 | 1,818 | 2,011 |  |  | 31
|  | Total | $ | 208 | 1,850 | 2,058 |  | $ | 31
Troubled Debt Restructuring Modifications [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Pre- |  | Post-
|  |  |  |  |  |  |  |  |  | modification |  | modification
|  |  |  |  |  |  |  |  |  | outstanding |  | outstanding
|  |  |  |  |  |  | Number of |  |  | recorded |  | recorded
($ in thousands) |  | contracts |  |  | investment |  | investment
December 31, 2017 |  |  |  |  |  |  |
Commercial and industrial |  | 1 |  | $ | 34 |  | 34
Commercial real estate: |  |  |  |  |  |  |
| Other |  | 1 |  | $ | 1,275 |  | 1,266
|  | Total commercial real estate |  | 1 |  |  | 1,275 |  | 1,266
|  | Total |  | 2 |  | $ | 1,309 |  | 1,300
December 31, 2016 |  |  |  |  |  |  |
Commercial real estate: |  |  |  |  |  |  |
| Other |  | 3 |  | $ | 3,147 |  | 3,137
|  | Total commercial real estate |  | 3 |  |  | 3,147 |  | 3,137
|  | Total |  | 3 |  | $ | 3,147 |  | 3,137

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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=32702940&loc=SL6953803-111525 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953659-111524 + Details
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