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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract] |  |  |
Net income | $ 27,034 | $ 24,996 | $ 20,699
Unrealized gains (losses) on securities available for sale: |  |  |
Unrealized holding gains (losses) arising during the period, pretax | (473) | 2,115 | (4,779)
Tax (expense) benefit | 184 | (825) | 1,865
Reclassification to realized (gains) losses | $ 1 | (786) | (532)
Tax expense (benefit) |  | 307 | 207
Postretirement plans: |  |  |
Net gain (loss) arising during period | $ (4,321) | (5,171) | 8,765
Tax (expense) benefit | 1,685 | 2,017 | (3,419)
Amortization of unrecognized net actuarial (gain) loss | (79) | (221) | (51)
Tax expense (benefit) | 31 | 86 | 20
Other comprehensive income (loss) | (2,972) | (2,478) | 2,076
Comprehensive income | $ 24,062 | $ 22,518 | $ 22,775

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