CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 18,565	$ 19,925	$ 17,507
Unrealized gains and losses on securities available-for-sale:
Unrealized holding gains (losses) on available for sale securities	6,966	(8,741)	19,819
Tax effect	(2,635)	3,578	(7,444)
Net of tax amount	4,331	(5,163)	12,375
Reclassification adjustments for OTTI losses included in income		652	870
Tax effect		(178)	(265)
Net of tax amount		474	605
Reclassification adjustment for realized gains arising during this period	(2,818)	(2,363)	(2,882)
Tax effect	986	645	879
Net of tax amount	(1,832)	(1,718)	(2,003)
Unrealized holding losses on securities transferred from available-for-sale to held-to-maturity securities		(2,612)
Tax effect		1,064
Net of tax amount		(1,548)
Amortization of unrealized holding gains on securities transferred from available-for-sale to held-to-maturity securities	215	(58)	(2)
Tax effect	(91)	19	1
Net of tax amount	124	(39)	(1)
Unrealized holding gain on cash flow hedge	48
Tax effect	(20)
Net of tax amount	28
Pension plan:
Actuarial gains (losses)	(1,896)	654	(790)
Tax effect	775	(267)	323
Net of tax amount	(1,121)	387	(467)
Total other comprehensive income (loss)	1,530	(7,607)	10,509
Total comprehensive income	$ 20,095	$ 12,318	$ 28,016