CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (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 income	$ 23,014us-gaap_NetIncomeLoss	$ 21,300us-gaap_NetIncomeLoss	$ 20,393us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Net unrealized holding gains (losses) on available-for-sale securities	18,046	(33,060)	(1,011)
Change in funded status of pension plan	(2,581)	8,057	(561)
Other comprehensive income (loss) before income taxes	15,465	(25,003)	(1,572)
Income tax expense (benefit)	6,342us-gaap_OtherComprehensiveIncomeLossTax	(9,925)us-gaap_OtherComprehensiveIncomeLossTax	(624)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss)	9,123	(15,078)	(948)
Comprehensive Income	$ 32,137us-gaap_ComprehensiveIncomeNetOfTax	$ 6,222us-gaap_ComprehensiveIncomeNetOfTax	$ 19,445us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount before tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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