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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 2,991,118 $ 2,864,255 $ 2,972,656 $ 2,852,453
Other comprehensive income (loss) before reclassifications (3,354) 5,226 (85,433) 104,028
Amounts reclassified from AOCI to income (2,098) (4,985) (5,528) (10,951)
Balance at end of period 3,035,892 2,921,149 3,035,892 2,921,149
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 62,262 149,043 147,771 56,207
Balance at end of period 56,810 149,284 56,810 149,284
Unrealized Gains and Losses on Available- for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 59,095 144,811 145,335 56,131
Other comprehensive income (loss) before reclassifications (3,230) 5,234 (87,403) 98,336
Amounts reclassified from AOCI to income (945) (3,837) (3,012) (8,259)
Balance at end of period 54,920 146,208 54,920 146,208
Gains and Losses on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 3,241 4,355 2,584 240
Other comprehensive income (loss) before reclassifications (124) (8) 1,970 5,692
Amounts reclassified from AOCI to income (1,190) (1,169) (2,627) (2,754)
Balance at end of period 1,927 3,178 1,927 3,178
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (74) (123) (148) (164)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI to income 37 21 111 62
Balance at end of period $ (37) $ (102) $ (37) $ (102)