Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]
NET INCOME	$ 19,039	$ 16,693	$ 13,574
Unrealized gains on securities:
Unrealized holding gains arising during period	5,854	6,666	1,315
Less: reclassification adjustment for gains included in net income	(1,843)	(1,940)	(1,851)
Total unrealized gains on securities	4,011	4,726	(536)
Pension liability adjustment:
Net gain (loss)	(2,488)	(4,047)	771
Amortization of prior service cost and loss included in net periodic benefit cost	649	380	488
Total pension liability adjustment	(1,839)	(3,667)	1,259
Other comprehensive income	2,172	1,059	723
Comprehensive income	$ 21,211	$ 17,752	$ 14,297