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INVESTMENTS - FHLB (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Investment in common stock $ 11,374,656 $ 8,208,566
Investment in FHLB    
Schedule of Investments [Line Items]    
Investment in common stock 129,258 137,760
Funding agreements issued to FHLB member banks 2,464,295 2,566,410
Collateral 3,570,569 4,135,612
FHLB Indianapolis | Investment in FHLB    
Schedule of Investments [Line Items]    
Investment in common stock 79,073 80,640
Funding agreements issued to FHLB member banks 1,606,262 1,619,765
Collateral 2,309,054 2,577,698
FHLB Des Moines | Investment in FHLB    
Schedule of Investments [Line Items]    
Investment in common stock 31,120 34,600
Funding agreements issued to FHLB member banks 536,338 620,006
Collateral 823,735 1,004,530
FHLB Boston | Investment in FHLB    
Schedule of Investments [Line Items]    
Investment in common stock 19,065 22,520
Funding agreements issued to FHLB member banks 321,695 326,639
Collateral $ 437,780 $ 553,384