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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity, amortized cost, one year or less $ 3,028  
Held-to-maturity, amortized cost, after one through five years 27,349  
Held-to-maturity, amortized cost, after five through ten years 390,411  
Held-to-maturity, amortized cost, after ten years 2,148,135  
Held-to-maturity, amortized cost, securities not due on a single maturity date 1,119,741  
Amortized Cost 3,688,664 $ 3,729,502
Held-to-maturity, fair value, one year or less 3,006  
Held-to-maturity, fair value, after one through five years 25,240  
Held-to-maturity, fair value, after five through ten years 340,536  
Held-to-maturity, fair value, after ten years 1,645,740  
Held-to-maturity, fair value, securities not due on a single maturity date 991,002  
Held-to-maturity, fair value, total 3,005,524 3,135,370
Available-for-sale, amortized cost, one year or less 7,736  
Available-for-sale, amortized cost, after one through five years 101,297  
Available-for-sale, amortized cost, after five through ten years 214,545  
Available-for-sale, amortized cost, after ten years 999,991  
Available-for-sale, amortized cost, securities not due on a single maturity date 1,931,923  
Available-for-sale, amortized cost, other securities (no maturity) 246  
Amortized Cost 3,255,738 3,509,709
Available-for-sale, fair value, one year or less 7,680  
Available-for-sale, fair value, after one through five years 100,641  
Available-for-sale, fair value, after five through ten years 191,523  
Available-for-sale, fair value, after ten years 854,972  
Available-for-sale, fair value, securities not due on a single maturity date 1,730,842  
Available-for-sale, fair value, other securities (no maturity) 246  
Available-for-sale, fair value, total $ 2,885,904 $ 3,152,153