Income Tax (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Currently Payable:
Federal									$ 738	$ (23)	$ 399
Deferred:
Federal									13,939	15,890	8,256
Total Income Tax Expense	3,187	2,667	4,155	4,668	3,153	3,926	3,288	5,500	14,677	15,867	8,655
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal Statutory Income Tax at 35%									20,722	21,347	11,867
Tax-exempt Interest Income									(3,923)	(3,716)	(3,714)
Non-deductible Interest Expense											649
Stock Compensation									50	76	69
Earnings on Life Insurance									(905)	(1,187)	(899)
Tax Credits									(857)	(73)	(99)
Other									(410)	(580)	782
Total Income Tax Expense	3,187	2,667	4,155	4,668	3,153	3,926	3,288	5,500	14,677	15,867	8,655
Tax expense applicable to security gains and losses, including unrealized losses relating to other-than-temporary charges									$ 157	$ 759	$ 714