Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract]
Net unrealized appreciation (depreciation) on securities available for sale, tax	$ 8,291	$ (7,926)	$ 915
Reclassification adjustment for net gains related to securities available for sale included in net income, tax	138	(230)	(658)
Other-than-temporary impairment adjustment, tax	0	122	398
Non-credit portion of other-than-temporary impairment losses, tax	0	(37)	(108)
Net unrealized depreciation on interest rate derivatives, tax	389	0	0
Net amortization of prior service cost and actuarial (gain) loss for supplemental executive retirement plan, tax	0	(36)	(47)
Actuarial (loss) gain on supplemental executive retirement plan, related tax	$ (59)	$ 51	$ (151)