Income Taxes (Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate) (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
Income Tax Disclosure [Abstract]
Computed tax expense									$ 12,220	$ 12,008	$ 13,285
Tax exempt income									(510)	(623)	(753)
State taxes, net of federal benefit									260	297	301
Goodwill impairment									991	0	18
Income from life insurance									(459)	(484)	(760)
Low income housing credits									(299)	(328)	(393)
Other									(71)	12	83
Income tax expense	$ 3,560	$ 2,952	$ 2,952	$ 2,668	$ 1,904	$ 2,992	$ 2,894	$ 3,092	$ 12,132	$ 10,882	$ 11,781
Income tax rate used for calculations									35.00%	35.00%	35.00%