Income Taxes (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Analysis of the difference between the statutory and effective tax rates from operations
U.S. federal income tax rate (as a percent)	35.00%	35.00%	35.00%
Tax exempt interest income (as a percent)	(2.10%)	(3.80%)	(3.70%)
Tax credits (as a percent)	(2.50%)	(2.20%)	(2.60%)
Cash surrender value of life insurance (as a percent)	(2.00%)	(1.90%)	(1.50%)
State income taxes (as a percent)	0.80%	1.00%	0.90%
Nontaxable gain on acquisition (as a percent)	(0.40%)
Nondeductible acquisition costs (as a percent)	0.20%
Establish deferred taxes on tax credit investments (as a percent)			(2.20%)
Other, net (as a percent)	0.20%	(0.90%)	(0.10%)
Effective tax rate (as a percent)	29.20%	27.20%	25.80%
Adjustment to deferred tax assets that relates to tax-advantaged investments			$ 700,000
Deferred tax assets and deferred tax liabilities
Allowance for loan loss	10,236,000	11,495,000
Deferred compensation	4,778,000	3,950,000
Accrued expenses	1,604,000	1,451,000
Investments in partnerships	826,000	713,000
Write-downs and costs associated with other real estate owned	749,000	1,335,000
Loans	564,000	211,000
Other-than-temporary impairment	311,000	312,000
Other assets	299,000	324,000
Total deferred tax assets	19,367,000	19,791,000
Securities	354,000	4,088,000
Property and equipment	1,377,000	1,162,000
Loan costs	702,000	648,000
Prepayment penalty on modification of FHLB advances	156,000	263,000
Mortgage servicing rights	608,000	703,000
Leases	428,000	100,000
Core deposit intangible	772,000
Other liabilities	416,000	289,000
Total deferred tax liabilities	4,813,000	7,253,000
Net deferred tax asset	$ 14,554,000	$ 12,538,000