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Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Payment Quarter Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Certificates of Deposits in Other Banks [Abstract] |  |  |
Maturity period of certificates of deposit in other banks | 18 months |  |
Loans [Abstract] |  |  |
Past due period after which loans must be well secured and in the process of collection to continue accruing interest | 90 days |  |
Period of current principal and interest payments for reclassifying nonaccrual loans as accruing loans | 6 months |  |
Allowance for Loan and Lease Losses [Abstract] |  |  |
Number of delinquent monthly payments before loan charge off | Payment | 5 |  |
Current value assessment period for past due loans secured against real estate | 90 days |  |
Threshold period past due for initiation of foreclosure proceedings | 120 days |  |
Historical loan loss review period | Quarter | 12 |  |
Goodwill and Core Deposit Intangible [Abstract] |  |  |
Goodwill | $ 65,490 | $ 65,490 |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance, January 1 | 291 |  |
Ending balance, December 31 | $ 133 | 291 |
Segment Reporting [Abstract] |  |  |
Number of operating segments | Segment | 1 |  |
Minimum [Member] |  |  |
Other Real Estate Owned [Abstract] |  |  |
Typical frequency of periodic reviews | 12 months |  |
Maximum [Member] |  |  |
Other Real Estate Owned [Abstract] |  |  |
Typical frequency of periodic reviews | 18 months |  |
Frequency of periodic reviews in general | 24 months |  |
Buildings [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 40 years |  |
Furniture, Fixtures, and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 2 years |  |
Furniture, Fixtures, and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years |  |
Core Deposit Intangible [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance, January 1 | $ 291 | 477 | $ 690
Amortization | (158) | (186) | (213)
Ending balance, December 31 | 133 | $ 291 | $ 477
Amortization of intangible assets for year one | $ 100 |  |
Commercial [Member] | Unsecured Commercial Loan [Member] |  |  |
Allowance for Loan and Lease Losses [Abstract] |  |  |
Charge off threshold for loans considered uncollectible | 90 days |  |
Consumer [Member] | Closed-End Consumer Loan [Member] |  |  |
Allowance for Loan and Lease Losses [Abstract] |  |  |
Charge off threshold for loans considered uncollectible | 120 days |  |

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- Definition Refer to current value assessment period for past due loans secured against real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Threshold period past due for the initiation of foreclosure proceedings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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