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Other Comprehensive Income (Loss) - Tax effects of components in other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Components of Other Comprehensive Income (Loss), Before Tax        
Unrealized gains (losses) on debt securities available for sale: $ 6,186 $ (5,992) $ 35,781 $ (23,253)
Accretion of unrealized gain on debt securities reclassified as held to maturity 2 1 13 (18)
Reclassification adjustment for gains included in net income 1,256 0 1,721 116
Total other comprehensive (loss) income, before tax 7,444 (5,991) 37,515 (23,155)
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges (1,619)   (11,059)  
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges   1,554   2,232
Employee benefit plans, Before tax        
Amortization of prior service cost included in net income (14) 0 (42) 125
Reclassification adjustment of actuarial net (loss) included in net income (930) 0 (2,779) 664
Change in funded status of retirement obligations 1,887 0 (2,785) (789)
Total employee benefit plans, before tax 943 0 (5,606) 0
Total other comprehensive income (loss) 6,768 (4,437) 20,850 (20,923)
Components of Other Comprehensive Income (Loss), Tax Effect        
Unrealized gains (losses) on debt securities available for sale: (1,271) 634 (7,479) 5,067
Accretion of unrealized gain on debt securities reclassified as held to maturity 0 (12) (3) 5
Reclassification adjustment for gains included in net income (291) 3 (396) (26)
Total other comprehensive (loss) income, tax (1,562) 625 (7,878) 5,046
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges 340   2,324  
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges   (314)   (486)
Employee benefit plans, Tax Effect        
Amortization of prior service cost included in net income 3 0 9 (27)
Reclassification adjustment of actuarial net (loss) included in net income 195 0 583 (144)
Change in funded status of retirement obligations (397) (1,908) 585 174
Total employee benefit plans, tax (199) (1,908) 1,177 3
Total other comprehensive income (loss) (1,421) (1,597) (4,377) 4,563
Components of Other Comprehensive Income (Loss), After Tax        
Unrealized gains (losses) on debt securities available for sale: 4,915 (5,358) 28,302 (18,186)
Accretion of unrealized gain (loss) on debt securities reclassified as held to maturity 2 (11) 10 (13)
Reclassification adjustment for gains included in net income 965 3 1,325 90
Total other comprehensive (loss) income, net of tax 5,882 (5,366) 29,637 (18,109)
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges (1,279)   (8,735)  
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges   1,240   1,746
Employee benefit plans, After Tax        
Amortization of prior service cost included in net income (11) 0 (33) 98
Reclassification adjustment of actuarial net (loss) included in net income (735) 0 (2,196) 520
Change in funded status of retirement obligations 1,490 (1,908) (2,200) (615)
Total employee benefit plans, net of tax 744 (1,908) (4,429) 3
Total other comprehensive income (loss) $ 5,347 $ (6,034) $ 16,473 $ (16,360)