Net Deferred Tax Asset and Income Taxes (Schedule of Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax expense at Federal statutory rate	$ 18,438	$ 17,805	$ 14,926
(Decrease) increase in taxes resulting from:
Tax-exempt income	(1,408)	(1,220)	(1,220)
Dividends received deduction	0	(12)	(32)
BOLI	(648)	(857)	(678)
Federal tax credits	(364)	(364)	(364)
State income tax expense, net of federal income tax benefit	461	358	315
Other	48	88	(25)
Total income tax expense	$ 16,527	$ 15,798	$ 12,922