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Comprehensive Income - AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Accumulated Comprehensive Income [Roll Forward]          
Balance, beginning of period $ 13,386,589 $ 13,512,529      
Balance, as adjusted     $ 13,236,376   $ 13,515,989
Net current period other comprehensive income 363,411 74,149      
Balance, end of period 11,358,354 13,727,537      
Total          
Accumulated Comprehensive Income [Roll Forward]          
Balance, beginning of period (1,072) (186,848)      
Cumulative effect adjustment related to ASU adoptions [1]       $ (35,436)  
Balance, as adjusted     $ (1,072)   (222,284)
Other comprehensive income before reclassifications 378,374 74,701      
Amounts reclassified from accumulated other comprehensive income (loss) (14,963) (552)      
Net current period other comprehensive income 363,411 74,149      
Balance, end of period 362,339 (148,135)      
Unrealized Gains (Losses) on Debt Securities Available for Sale and Transferred to Held to Maturity          
Accumulated Comprehensive Income [Roll Forward]          
Balance, beginning of period (40,080) (158,433)      
Cumulative effect adjustment related to ASU adoptions [1]       (25,844)  
Balance, as adjusted         (184,277)
Other comprehensive income before reclassifications 99,699 51,700      
Amounts reclassified from accumulated other comprehensive income (loss) (12,997) (5,091)      
Net current period other comprehensive income 86,702 46,609      
Balance, end of period 46,622 (137,668)      
Accumulated Gains (Losses) on Cash Flow Hedging Instruments          
Accumulated Comprehensive Income [Roll Forward]          
Balance, beginning of period 91,445 6,175      
Cumulative effect adjustment related to ASU adoptions [1]       (1,040)  
Balance, as adjusted         5,135
Other comprehensive income before reclassifications 278,675 23,001      
Amounts reclassified from accumulated other comprehensive income (loss) (3,838) 1,052      
Net current period other comprehensive income 274,837 24,053      
Balance, end of period 366,282 29,188      
Defined Benefit Plan Adjustment          
Accumulated Comprehensive Income [Roll Forward]          
Balance, beginning of period (46,666) (29,495)      
Cumulative effect adjustment related to ASU adoptions [1]       (7,351)  
Balance, as adjusted         (36,846)
Other comprehensive income before reclassifications 0 0      
Amounts reclassified from accumulated other comprehensive income (loss) 1,754 3,119      
Net current period other comprehensive income 1,754 3,119      
Balance, end of period (44,912) (33,727)      
Unamortized Impairment Losses on Debt Securities Held to Maturity          
Accumulated Comprehensive Income [Roll Forward]          
Balance, beginning of period (5,771) (5,095)      
Cumulative effect adjustment related to ASU adoptions [1]       $ (1,201)  
Balance, as adjusted         $ (6,296)
Other comprehensive income before reclassifications 0 0      
Amounts reclassified from accumulated other comprehensive income (loss) 118 368      
Net current period other comprehensive income 118 368      
Balance, end of period $ (5,653) $ (5,928)      
[1] Related to the Company's adoption of ASU 2017-12 and ASU 2018-02 on January 1, 2019.