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Acquisition of Delaware Bancshares, Inc. (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Oct. 31, 2007 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Certain Loans Acquired in Transfer, Nonaccretable Difference | $ 1,014 |  |  |  |
Loans and Leases Receivable, Net Reported Amount |  |  | $ 707,426 | $ 552,627 |
Loans Receivable, Fair Value Disclosure |  |  | 716,661 | 559,416 |
Goodwill |  |  | 11,331 | 9,715 |
Goodwill, Impairment Loss |  |  | 0 | 0 | $ 0
Finite-Lived Intangible Assets, Accumulated Amortization |  |  | 732 | $ 610 |
Delaware Bancshares, Inc. Acquisition [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Share Price | $ 16.68 |  |  |  |
Business Acquisition, shares exchanged | 0.6221 |  |  |  |
Payments to Acquire Businesses, Gross | $ 3,860 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 431,605 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance | $ 1,410 |  |  |  |
Certain Loans Acquired in Transfer, Nonaccretable Difference | 260 |  |  |  |
Loans and Leases Receivable, Net Reported Amount | 111,307 |  |  |  |
Loans Receivable, Fair Value Disclosure | 109,693 |  |  |  |
Goodwill | $ 1,616 |  | 1,616 |  |
Goodwill, Impairment Loss |  |  | $ 0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 10 years |  |
Finite-Lived Intangible Assets, Gross |  |  | $ 449 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  | $ 14 |  |
Delaware Bancshares, Inc. Acquisition [Member] | Delaware Bancshares, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from Issuance of Trust Preferred Securities |  | $ 8,000 |  |  |
Delaware Bancshares, Inc. Acquisition [Member] | Delaware Bancshares, Inc. [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.40% |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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