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Income Taxes - Significant Components of Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets:    
Allowance for loan losses $ 12,440 $ 19,446
Purchase accounting adjustments 0 365
Other employee benefits 3,095 3,983
Low income housing partnerships 3,213 4,845
Net adjustment to funded status of pension 6,481 10,018
Impairment of securities 300 1,318
State net operating loss carryforwards 3,598 3,114
Other 2,355 4,984
Gross Deferred Tax Assets 31,482 48,073
Less: Valuation allowance (3,598) (3,114)
Total Deferred Tax Assets 27,884 44,959
Deferred Tax Liabilities:    
Net unrealized holding gains on securities available-for-sale (638) (2,557)
Prepaid pension (1,749) (2,770)
Deferred loan income (2,937) (3,815)
Purchase accounting adjustments (100) 0
Depreciation on premises and equipment (480) (1,239)
Other (1,401) (1,766)
Total Deferred Tax liabilities (7,305) (12,147)
Net Deferred Tax Asset $ 20,579 $ 32,812