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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Amounts reclassified from accumulated other comprehensive loss $ 5,933 $ 7,698 $ 14,926 $ 16,526  
Net current period other comprehensive income 8,959 (2,937) 63,415 (75,230)  
Unrealized Losses on Investment Securities Available for Sale          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance [1] 2,554 (57,496) (38,505) (30,945)  
Cumulative effect of new accounting principle in period of adoption [1],[2]         $ (29,751)
Adjusted beginning balance [1]         (60,696)
Net unrealized gains arising during period [1] 3,026 (10,635) 48,489 (7,435)  
Amounts reclassified from accumulated other comprehensive loss [1] (874) 0 (5,278) 0  
Net current period other comprehensive income [1] 2,152 (10,635) 43,211 (7,435)  
Ending balance [1] 4,706 (68,131) 4,706 (68,131)  
Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance [1] (61,979) (80,876) (71,149) 0  
Cumulative effect of new accounting principle in period of adoption [1],[2]         0
Adjusted beginning balance [1]         0
Net unrealized gains arising during period [1] 0 0 0 (84,321)  
Amounts reclassified from accumulated other comprehensive loss [1] 4,693 5,007 13,863 8,452  
Net current period other comprehensive income [1] 4,693 5,007 13,863 (75,869)  
Ending balance [1] (57,286) (75,869) (57,286) (75,869)  
Defined Benefit Pension Items          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance [1] (121,306) (106,266) (125,533) (91,349)  
Cumulative effect of new accounting principle in period of adoption [1],[2]         (20,300)
Adjusted beginning balance [1]         (111,649)
Net unrealized gains arising during period [1] 0 0 0 0  
Amounts reclassified from accumulated other comprehensive loss [1] 2,114 2,691 6,341 8,074  
Net current period other comprehensive income [1] 2,114 2,691 6,341 8,074  
Ending balance [1] (119,192) (103,575) (119,192) (103,575)  
Accumulated Other Comprehensive (Loss) Income          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance (180,731) (244,638) (235,187) (122,294)  
Cumulative effect of new accounting principle in period of adoption [2]         (50,051)
Adjusted beginning balance         $ (172,345)
Net unrealized gains arising during period 3,026 (10,635) 48,489 (91,756)  
Amounts reclassified from accumulated other comprehensive loss 5,933 7,698 14,926 16,526  
Net current period other comprehensive income 8,959 (2,937) 63,415 (75,230)  
Ending balance $ (171,772) $ (247,575) $ (171,772) $ (247,575)  
[1] All amounts are net of tax. Amounts in parentheses indicate debits.
[2]
(2) Cumulative adjustments for adoption of ASU 2018-02 of $31.3 million and ASU 2016-01 of $18.7 million.