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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 2,972,656 $ 2,852,453 $ 2,689,570
Other comprehensive income (loss) before       reclassifications (143,515) 103,826 100,973
Amounts reclassified from AOCI to income (6,631) (12,262) 184
Ending Balance 3,012,018 2,972,656 2,852,453
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 147,771 56,207 (44,950)
Ending Balance (2,375) 147,771 56,207
Unrealized Gains and Losses on Available- for-Sale Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 145,335 56,131 (37,348)
Other comprehensive income (loss) before       reclassifications (144,948) 97,596 94,964
Amounts reclassified from AOCI to income (3,337) (8,392) (1,485)
Ending Balance (2,950) 145,335 56,131
Unrealized Gains and Losses on Held-to- Maturity Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 0 0 (8,515)
Other comprehensive income (loss) before       reclassifications 0 0 6,419
Amounts reclassified from AOCI to income 0 0 2,096
Ending Balance 0 0 0
Gains and Losses on Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 2,584 240 1,099
Other comprehensive income (loss) before       reclassifications 1,433 6,230 (410)
Amounts reclassified from AOCI to income (3,474) (3,886) (449)
Ending Balance 543 2,584 240
Defined Benefit Pension Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (148) (164) (186)
Other comprehensive income (loss) before       reclassifications 0 0 0
Amounts reclassified from AOCI to income 180 16 22
Ending Balance $ 32 $ (148) $ (164)