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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 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 | $ 9,012 |
Due After One Year Through Five Years | 443,955 |
Due After Five Years Through Ten Years | 651,597 |
Due After Ten Years | 6,380 |
Amortized Cost, Total | 1,110,944 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 2,993,004 | $ 3,172,436
Due in One Year or Less | 8,980 |
Due After One Year Through Five Years | 419,503 |
Due After Five Years Through Ten Years | 595,753 |
Due After Ten Years | 5,172 |
Fair Value, Total | 1,029,408 |
Available-for-Sale: Fair Value | 2,666,723 | 2,844,823
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract] |  |
Due After One Year Through Five Years | 83,436 |
Due After Five Year Through Ten Years | 49,448 |
Due After Ten Years | 10,888 |
Amortized Cost, Total | 143,772 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Due After One Year Through Five Years | 73,401 |
Due After Five Year Through Ten Years | 41,783 |
Due After Ten Years | 8,748 |
Fair Value, Total | 123,932 |
Held-to-Maturity: Amortized Cost | 5,202,698 |
Held-to-Maturity: Fair Value | 4,411,003 | 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 | 78,199 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 78,604 |
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 | 78,604 |
Residential - Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 771,006 |
Available-for-Sale: Amortized Cost | 771,006 | 828,798
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 675,204 |
Available-for-Sale: Fair Value | 675,204 | 732,828
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,761,490 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,761,490 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 675,204 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,470,627 |
Held-to-Maturity: Fair Value | 1,470,627 | 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 | 869,381 |
Available-for-Sale: Amortized Cost | 869,381 | 919,980
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 744,714 |
Available-for-Sale: Fair Value | 744,714 | 793,871
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,856,709 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,856,709 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 744,714 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,469,057 |
Held-to-Maturity: Fair Value | 2,469,057 | 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 | 163,474 |
Available-for-Sale: Amortized Cost | 163,474 | 168,242
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 138,793 |
Available-for-Sale: Fair Value | 138,793 | 145,667
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 440,727 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 440,727 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 138,793 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 347,387 |
Held-to-Maturity: Fair Value | 347,387 | 361,994
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,803,861 |
Available-for-Sale: Amortized Cost | 1,803,861 | 1,917,020
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,558,711 |
Available-for-Sale: Fair Value | 1,558,711 | 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 | 5,058,926 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 5,058,926 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,558,711 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 4,287,071 |
Held-to-Maturity: Fair Value | $ 4,287,071 | $ 4,487,496

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