Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 4,297	$ 4,347
Net change in fair value of interest rate swap agreements designated as cash flow hedges:
Unrealized gain on interest rate swaps, net of tax of ($6) in 2013	12	1
Reclassification adjustment for losses recognized in earnings, net of tax of ($34) and ($33), respectively	63	62
Other comprehensive loss, net of tax	75	63
Unrealized losses on other-than-temporarily impaired securities available for sale:
Unrealized losses arising during the period, net of tax of $15 in 2013	(27)	0
Unrealized losses on other securities available for sale:
Unrealized losses arising during the period, net of tax of $865 and $647, respectively	(1,606)	(1,201)
Reclassification adjustment for realized gains included in net income, net of tax of $27 and $198, respectively	(49)	(368)
Unrealized losses on other securities available for sale net of reclassification adjustment for realized gains included in net income	(1,655)	(1,569)
Other comprehensive loss	(1,607)	(1,506)
COMPREHENSIVE INCOME	$ 2,690	$ 2,841