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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Other comprehensive income (loss):    
Other comprehensive loss, before tax $ (238,903) $ (69,404)
Other comprehensive income (loss):    
Other comprehensive income, tax effect 35,897 10,201
Net of Tax    
Balance, beginning of period 4,236,114  
Other comprehensive income (loss):    
Total other comprehensive loss (203,006) (59,203)
Balance, end of period 4,215,068 3,920,937
Accumulated Other Comprehensive Income (Loss)    
Before Tax    
AOCI before tax, beginning of period 65,280 168,324
Other comprehensive income (loss):    
AOCI before tax, end of period (173,623) 98,920
Tax Effect    
AOCI tax effect, beginning of period (14,573) (30,050)
Other comprehensive income (loss):    
AOCI tax effect, end of period 21,324 (19,849)
Net of Tax    
Balance, beginning of period 50,707 138,274
Other comprehensive income (loss):    
Total other comprehensive loss (203,006) (59,203)
Balance, end of period (152,299) 79,071
Accumulated Net Investment Gains (Losses) On Investments    
Other comprehensive income (loss):    
Unrealized holding losses arising during the period, before tax (246,255) (68,763)
Less: Reclassification adjustment for losses (gains) included in net income, before tax 7,352 (641)
Other comprehensive loss, before tax (238,903) (69,404)
Other comprehensive income (loss):    
Unrealized holding losses arising during the period, tax effect 34,830 10,201
Less: Reclassification adjustment for losses (gains) included in net income, tax effect 1,067 0
Other comprehensive income, tax effect 35,897 10,201
Other comprehensive income (loss):    
Unrealized holding losses arising during the period, net of tax (211,425) (58,562)
Less: Reclassification adjustment for losses (gains) included in net income, net of tax 8,419 (641)
Total other comprehensive loss $ (203,006) $ (59,203)