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Accounting Policies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 Segment Payment | Dec. 31, 2012 | Dec. 31, 2011
Accounting Policies [Abstract] |  |  |
Maturity period of certificates of deposit in other banks | 18 months |  |
Charge off threshold for unsecured commercial loans considered uncollectible | 90 days |  |
Charge off threshold for closed-end consumer loans and uncollectible loans | 120 days |  |
Number of monthly payments before loan charge off | 5 |  |
Allowance for Loan Losses [Abstract] |  |  |
Estimate change impact to provision for loan loss requirement in the most likely scenario | $ 5,900,000 |  |
Other real estate owned [Abstract] |  |  |
Other real estate owned frequency of period reviews minimum | 12 months |  |
Other Real Estate Owned Frequency Of Period Reviews maximum | 18 months |  |
Maximum frequency of periodic reviews of real estate owned generally | 24 months |  |
Goodwill [Roll Forward] |  |  |
Beginning balance, January 1 | 65,490,000 | 65,490,000 | 65,499,000
Acquisition adjustments | 0 | 0 | (9,000)
Ending balance, December 31 | 65,490,000 | 65,490,000 | 65,490,000
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance, January 1 | 904,000 |  |
Ending balance, December 31 | 690,000 | 904,000 |
Segment Reporting [Abstract] |  |  |
Number of operating segments | 1 |  |
Core Deposits [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance, January 1 | 904,000 | 1,117,000 | 1,342,000
Amortization | (214,000) | (213,000) | (213,000)
Acquisition adjustments | 0 | 0 | (12,000)
Ending balance, December 31 | 690,000 | 904,000 | 1,117,000
Amortization of intangible assets for year one | 200,000 |  |
Amortization of intangible assets for year two | 200,000 |  |
Amortization of intangible assets for year three | 200,000 |  |
Amortization of intangible assets for year four | $ 100,000 |  |
Minimum [Member] |  |  |
Allowance for Loan Losses [Abstract] |  |  |
Historical loan loss review period (in quarters) | 4 |  |
Maximum [Member] |  |  |
Allowance for Loan Losses [Abstract] |  |  |
Historical loan loss review period (in quarters) | 8 |  |
Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of assets | 40 years |  |
Furniture, fixtures, and equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of assets | 2 years |  |
Furniture, fixtures, and equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful life of assets | 10 years |  |

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- Definition The maximum number of days that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier. + References No definition available. + Details
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