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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity[Abstract] |  |
Due in One Year or Less | $ 1,798 |
Due After One Year Through Five Years | 332,832 |
Due After Five Years Through Ten Years | 598,290 |
Due After Ten Years | 6,380 |
Amortized Cost, Total | 939,300 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 2,752,093 | $ 3,172,436
Due in One Year or Less | 1,768 |
Due After One Year Through Five Years | 309,375 |
Due After Five Years Through Ten Years | 537,433 |
Due After Ten Years | 4,866 |
Fair Value, Total | 853,442 |
Available-for-Sale: Fair Value | 2,387,324 | 2,844,823
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract] |  |
Due in One Year or Less | 966 |
Due After One Year Through Five Years | 82,244 |
Due After Five Year Through Ten Years | 60,288 |
Amortized Cost, Total | 143,498 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Due in One Year or Less | 943 |
Due After One Year Through Five Years | 71,390 |
Due After Five Year Through Ten Years | 48,282 |
Fair Value, Total | 120,615 |
Held-to-Maturity: Amortized Cost | 5,088,013 |
Held-to-Maturity: Fair Value | 4,104,469 | 4,615,393
Debt Securities Issued by Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 71,053 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 71,396 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 71,396 |
Residential - Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 740,652 |
Available-for-Sale: Amortized Cost | 740,652 | 828,798
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 631,947 |
Available-for-Sale: Fair Value | 631,947 | 732,828
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,712,317 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,712,317 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 631,947 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,382,197 |
Held-to-Maturity: Fair Value | 1,382,197 | 1,554,227
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 841,441 |
Available-for-Sale: Amortized Cost | 841,441 | 919,980
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 699,349 |
Available-for-Sale: Fair Value | 699,349 | 793,871
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,794,307 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,794,307 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 699,349 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,275,174 |
Held-to-Maturity: Fair Value | 2,275,174 | 2,571,275
Commercial - Government Agencies or Sponsored Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 159,647 |
Available-for-Sale: Amortized Cost | 159,647 | 168,242
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 131,190 |
Available-for-Sale: Fair Value | 131,190 | 145,667
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 437,891 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 437,891 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 131,190 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 326,483 |
Held-to-Maturity: Fair Value | 326,483 | 361,994
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,741,740 |
Available-for-Sale: Amortized Cost | 1,741,740 | 1,917,020
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,462,486 |
Available-for-Sale: Fair Value | 1,462,486 | 1,672,366
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 4,944,515 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 4,944,515 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,462,486 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 3,983,854 |
Held-to-Maturity: Fair Value | $ 3,983,854 | $ 4,487,496

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