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Accumulated Other Comprehensive Income Changes in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Unrealized gain on securities, before tax amount $ (15,865) $ 5,109 $ (59,250) $ 27,482
Unrealized gain on securities, tax effect 3,334 (1,789) 12,444 (9,621)
Unrealized gain on securities, net of tax amount (12,531) 3,320 (46,806) 17,861
Reclassification adjustment for securities gains included in net income, before tax amount (14) (4,597) (37) (7,139)
Reclassification adjustment for securities gains included in net income, tax effect 3 1,609 7 2,500
Reclassification adjustment for securities gains included in net income, net of tax amount (11) (2,988) (30) (4,639)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Held-to-maturity, before Tax 1,000   1,000  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Held-to-maturity, Tax (209)   (209)  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Held-to-maturity, after Tax 791 0 791 0
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, before tax amount     294  
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, tax effect     (62)  
Non-credit related unrealized gains on other-than-temporarily impaired debt securities, net of tax amount 0 0 (232) 0
Amortization of net unrecognized pension and postretirement items, before tax amount 466 523 1,580 1,575
Amortization of net unrecognized pension and postretirement items, tax effect (97) (183) (332) (551)
Amortization of net unrecognized pension and postretirement items, net of tax amount 369 340 1,248 1,024
Total Other Comprehensive Income, Before Tax Amount (14,413) 1,035 (56,413) 21,918
Total Other Comprehensive Income, Tax Effect 3,031 (363) 11,848 (7,672)
Other Comprehensive (Loss) Income $ (11,382) $ 672 $ (44,565) $ 14,246