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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity, amortized cost, one year or less $ 1,909  
Held-to-maturity, amortized cost, after one through five years 42,277  
Held-to-maturity, amortized cost, after five through ten years 405,709  
Held-to-maturity, amortized cost, after ten years 2,118,949  
Held-to-maturity, amortized cost, securities not due on a single maturity date 1,093,070  
Amortized Cost 3,661,914 $ 3,729,502
Held-to-maturity, fair value, one year or less 1,906  
Held-to-maturity, fair value, after one through five years 40,576  
Held-to-maturity, fair value, after five through ten years 366,933  
Held-to-maturity, fair value, after ten years 1,695,214  
Held-to-maturity, fair value, securities not due on a single maturity date 1,004,981  
Held-to-maturity, fair value, total 3,109,610 3,135,370
Available-for-sale, amortized cost, one year or less 3,814  
Available-for-sale, amortized cost, after one through five years 108,132  
Available-for-sale, amortized cost, after five through ten years 198,468  
Available-for-sale, amortized cost, after ten years 1,031,775  
Available-for-sale, amortized cost, securities not due on a single maturity date 1,634,391  
Available-for-sale, amortized cost, other securities (no maturity) 231  
Amortized Cost 2,976,811 3,509,709
Available-for-sale, fair value, one year or less 3,791  
Available-for-sale, fair value, after one through five years 107,789  
Available-for-sale, fair value, after five through ten years 181,503  
Available-for-sale, fair value, after ten years 887,378  
Available-for-sale, fair value, securities not due on a single maturity date 1,510,402  
Available-for-sale, fair value, other securities (no maturity) 231  
Available-for-sale, fair value, total $ 2,691,094 $ 3,152,153