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Other Comprehensive Income (Loss) - Tax effects of components in other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of Other Comprehensive Income (Loss), Before Tax        
Unrealized gains (losses) on debt securities available for sale: $ 17,829 $ (5,623) $ 29,595 $ (17,261)
Accretion of unrealized (loss) gain on debt securities reclassified as held to maturity (2) 80 11 (16)
Reclassification adjustment for gains included in net income 339 0 465 116
Total other comprehensive (loss) income, before tax 18,166 (5,543) 30,071 (17,161)
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges (5,920)   (9,440)  
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges   297   678
Employee benefit plans, Before tax        
Amortization of prior service cost included in net income (14) 0 (28) 148
Reclassification adjustment of actuarial net (loss) included in net income (925) 0 (1,849) 673
Change in funded status of retirement obligations (5,610) 0 (4,672) (819)
Total employee benefit plans, before tax (6,549) 0 (6,549) 2
Total other comprehensive income (loss) 5,697 (5,246) 14,082 (16,481)
Components of Other Comprehensive Income (Loss), Tax Effect        
Unrealized gains (losses) on debt securities available for sale: (3,737) 2,763 (6,208) 4,432
Accretion of unrealized (loss) gain on debt securities reclassified as held to maturity 0 (83) (3) 14
Reclassification adjustment for gains included in net income (79) 0 (105) (28)
Total other comprehensive (loss) income, tax (3,816) 2,680 (6,316) 4,418
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges 1,244   1,984  
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges   (133)   (172)
Employee benefit plans, Tax Effect        
Amortization of prior service cost included in net income 3 0 6 (30)
Reclassification adjustment of actuarial net (loss) included in net income 194 0 388 (146)
Change in funded status of retirement obligations 1,179 2,323 982 2,085
Total employee benefit plans, tax 1,376 2,323 1,376 1,909
Total other comprehensive income (loss) (1,196) 4,870 (2,956) 6,155
Components of Other Comprehensive Income (Loss), After Tax        
Unrealized gains (losses) on debt securities available for sale: 14,092 (2,860) 23,387 (12,829)
Accretion of unrealized (loss) gain on debt securities reclassified as held to maturity (2) (3) 8 (2)
Reclassification adjustment for gains included in net income 260 0 360 88
Total other comprehensive (loss) income, net of tax 14,350 (2,863) 23,755 (12,743)
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges (4,676)   (7,456)  
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges   164   506
Employee benefit plans, After Tax        
Amortization of prior service cost included in net income (11) 0 (22) 118
Reclassification adjustment of actuarial net (loss) included in net income (731) 0 (1,461) 527
Change in funded status of retirement obligations (4,431) 2,323 (3,690) 1,266
Total employee benefit plans, net of tax (5,173) 2,323 (5,173) 1,911
Total other comprehensive income (loss) $ 4,501 $ (376) $ 11,126 $ (10,326)