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Accumulated Other Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components Of Accumulated Other Comprehensive Income (Loss)
Unrealized Gains (Losses) on Securities (1)Pension Loss Unrealized Gains on Cash Flow Hedge Derivatives (2)Total Accumulated Other Comprehensive Income (Loss)
(In thousands)OTTIOther
Balance January 1, 2020$3,264 $98,809 $(21,940)$30,311 $110,444 
Adoption of ASU 2016-13(3,264)3,264    
Balance January 1, 2020, adjusted$ $102,073 $(21,940)$30,311 $110,444 
Other comprehensive income (loss) before reclassifications 236,733 (6,104)93,497 324,126 
Amounts reclassified from accumulated other comprehensive income (21,096)1,867 (10,319)(29,548)
Current period other comprehensive income (loss), before tax
 215,637 (4,237)83,178 294,578 
Income tax (expense) benefit (53,909)1,059 (20,795)(73,645)
Current period other comprehensive income (loss), net of tax
 161,728 (3,178)62,383 220,933 
Balance December 31, 2020$ $263,801 $(25,118)$92,694 $331,377 
Balance January 1, 2019$3,861 $(52,278)$(23,107)$6,855 $(64,669)
Other comprehensive income (loss) before reclassifications(975)201,280 (461)27,481 227,325 
Amounts reclassified from accumulated other comprehensive income133 215 2,017 3,793 6,158 
Current period other comprehensive income (loss), before tax
(842)201,495 1,556 31,274 233,483 
Income tax (expense) benefit210 (50,373)(389)(7,818)(58,370)
Current period other comprehensive income (loss), net of tax
(632)151,122 1,167 23,456 175,113 
Transfer of unrealized gain on securities for which impairment was not previously recognized
35 (35)— — — 
Balance December 31, 2019$3,264 $98,809 $(21,940)$30,311 $110,444 
(1) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.
(2) The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income.