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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance     $ (124,972)       $ (124,972)  
Investment securities losses (gains), net             (13,861) $ (3,938)
Personnel expense $ (123,170)     $ (124,476)     (366,449) (366,141)
Adjustment for adoption of ASU 2016-01           $ 84    
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities 8     52     (279) 684
Total other comprehensive income (loss) 22,111 $ 44,311 21,597 (15,631) $ (12,215) (31,177) 88,020 (72,762)
Ending Balance (36,953)           (36,953)  
Investment Securities Available For Sale                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (9,773)   (75,643) (90,986)   (38,453) (75,643) (38,453)
Other comprehensive income (loss) before reclassifications 33,173     (21,345)     123,139 (82,099)
Investment securities losses (gains), net (3,788)     (30)     (5,931) 1,985
Personnel expense 0     0     0 0
Other expense 0     0     0 0
Adjustment for adoption of ASU 2016-01               (84)
Adjustment for adoption of ASU 2018-02               (8,419)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (8)     (52)     279 (684)
Income tax (expense) benefit (7,410)     5,456     (29,651) 20,796
Total other comprehensive income (loss) 21,967     (15,971)     87,836 (68,505)
Ending Balance 12,194 (9,773)   (106,958) (90,986)   12,194 (106,958)
Defined Benefit Pension and Post Retirement Obligations                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (49,290)   (49,330) (28,902)   (24,305) (49,330) (24,305)
Other comprehensive income (loss) before reclassifications 0     0     0 0
Investment securities losses (gains), net 0     0       0
Personnel expense (36)     (37)     (111) (112)
Other expense 229     551     357 1,480
Adjustment for adoption of ASU 2016-01               0
Adjustment for adoption of ASU 2018-02               (5,235)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities 0     0     0 0
Income tax (expense) benefit (49)     (174)     (62) (390)
Total other comprehensive income (loss) 144     340     184 (4,257)
Ending Balance (49,146) (49,290)   (28,562) (28,902)   (49,146) (28,562)
Accumulated Other Comprehensive Income (Loss)                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (59,063)   (124,972) (119,888)   (62,758) (124,972) (62,758)
Other comprehensive income (loss) before reclassifications 33,173     (21,345)     123,139 (82,099)
Investment securities losses (gains), net (3,788)     (30)     (5,931) 1,985
Personnel expense (36)     (37)     (111) (112)
Other expense 229     551     357 1,480
Adjustment for adoption of ASU 2016-01               (84)
Adjustment for adoption of ASU 2018-02               (13,654)
Amortization of net unrealized (gains) losses on available for sale securities transferred to held to maturity securities (8)     (52)     279 (684)
Income tax (expense) benefit (7,458)     5,282     (29,713) 20,406
Total other comprehensive income (loss) 22,111 44,311 $ 21,597 (15,631) (12,215) $ (31,177) 88,020 (72,762)
Ending Balance $ (36,953) $ (59,063)   $ (135,520) $ (119,888)   $ (36,953) $ (135,520)