Income Tax (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Currently Payable:
Federal	$ 30us-gaap_CurrentFederalTaxExpenseBenefit	$ (1,519)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred:
Federal	5,669	6,026
State	135	110
Total Income Tax Expense	5,834us-gaap_IncomeTaxExpenseBenefit	4,617us-gaap_IncomeTaxExpenseBenefit
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal statutory income tax at 35%	7,702	6,383
Tax-exempt interest income	(1,429)	(1,225)
Stock compensation	8	13
Earnings on life insurance	(262)	(262)
Tax credits	(144)	(298)
Other	(41)	6
Total Income Tax Expense	$ 5,834us-gaap_IncomeTaxExpenseBenefit	$ 4,617us-gaap_IncomeTaxExpenseBenefit
Federal statutory income tax rate	35.00%	35.00%

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions.

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