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Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
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 days
Property, Plant and Equipment [Line Items]
Estimate change impact to provision for loan loss requirement in the most likely scenario	$ 3,200,000
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	65,499,000	65,059,000
Acquisition adjustments	0	(9,000)	440,000
Ending balance, December 31	65,490,000	65,490,000	65,499,000
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, January 1	1,117,000
Ending balance, December 31	904,000	1,117,000
Segment Reporting [Abstract]
Number of operating segments	1
Core Deposits [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, January 1	1,117,000	1,342,000	648,000
Amortization	(213,000)	(213,000)	(430,000)
Acquisition adjustments	0	(12,000)	1,124,000
Ending balance, December 31	$ 904,000	$ 1,117,000	$ 1,342,000
Minimum [Member]
Property, Plant and Equipment [Line Items]
Historical loan loss review period (in quarters)	4
Minimum [Member] | Core Deposits [Member]
Finite-lived Intangible Assets [Roll Forward]
Amortization period	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Historical loan loss review period (in quarters)	8
Maximum [Member] | Core Deposits [Member]
Finite-lived Intangible Assets [Roll Forward]
Amortization period	5 years
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.

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The impact the change in experience ratio for historical loss rates had on the provision for loan loss requirement in the best case scenario.

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