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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity, amortized cost, one year or less $ 7,034  
Held-to-maturity, amortized cost, after one through five years 8,931  
Held-to-maturity, amortized cost, after five through ten years 5,695  
Held-to-maturity, amortized cost, after ten years 541,470  
Held-to-maturity, amortized cost, securities not due on a single maturity date 47,988  
Amortized Cost 611,118 $ 335,946
Held-to-maturity, fair value, one year or less 7,117  
Held-to-maturity, fair value, after one through five years 9,317  
Held-to-maturity, fair value, after five through ten years 4,556  
Held-to-maturity, fair value, after ten years 529,339  
Held-to-maturity, fair value, securities not due on a single maturity date 47,365  
Held-to-maturity, fair value, total 597,694 341,925
Available-for-sale, amortized cost, one year or less 11,951  
Available-for-sale, amortized cost, after one through five years 28,425  
Available-for-sale, amortized cost, after five through ten years 373,751  
Available-for-sale, amortized cost, after ten years 2,010,880  
Available-for-sale, amortized cost, securities not due on a single maturity date 2,156,121  
Available-for-sale, amortized cost, other securities (no maturity) 924  
Amortized Cost 4,582,052 3,397,043
Available-for-sale, fair value, one year or less 12,000  
Available-for-sale, fair value, after one through five years 28,755  
Available-for-sale, fair value, after five through ten years 370,817  
Available-for-sale, fair value, after ten years 1,982,767  
Available-for-sale, fair value, securities not due on a single maturity date 2,133,086  
Available-for-sale, fair value, other securities (no maturity) 923  
Available-for-sale, fair value, total $ 4,528,348 $ 3,473,598