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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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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 | $ 23,898 |
Due After One Year Through Five Years | 442,494 |
Due After Five Years Through Ten Years | 470,158 |
Amortized Cost, Total | 936,550 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 2,769,067 | $ 2,694,012
Due in One Year or Less | 23,656 |
Due After One Year Through Five Years | 421,354 |
Due After Five Years Through Ten Years | 446,599 |
Fair Value, Total | 891,609 |
Available-for-Sale: Fair Value | 2,550,324 | 2,408,933
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract] |  |
Due in One Year or Less | 2,499 |
Due After One Year Through Five Years | 79,801 |
Due After Five Year Through Ten Years | 60,092 |
Amortized Cost, Total | 142,392 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 4,710,245 | 4,997,335
Due in One Year or Less | 2,422 |
Due After One Year Through Five Years | 73,930 |
Due After Five Year Through Ten Years | 52,295 |
Fair Value, Total | 128,647 |
Held-to-Maturity: Fair Value | 4,072,596 | 4,253,637
Debt Securities Issued by Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 77,935 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 78,120 |
Residential - Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 716,933 |
Available-for-Sale: Amortized Cost | 716,933 | 713,918
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 648,589 |
Available-for-Sale: Fair Value | 648,589 | 629,327
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 1,553,811 | 1,674,076
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,553,811 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,326,603 |
Held-to-Maturity: Fair Value | 1,326,603 | 1,408,603
Residential - U.S. Government-Sponsored Enterprises |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 773,520 |
Available-for-Sale: Amortized Cost | 773,520 | 818,296
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 687,820 |
Available-for-Sale: Fair Value | 687,820 | 709,127
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 2,585,212 | 2,744,094
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,585,212 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,269,228 |
Held-to-Maturity: Fair Value | 2,269,228 | 2,374,138
Commercial - Government Agencies or Sponsored Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 264,129 |
Available-for-Sale: Amortized Cost | 264,129 | 157,515
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 244,186 |
Available-for-Sale: Fair Value | 244,186 | 134,923
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 428,830 | 435,940
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 428,830 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 348,118 |
Held-to-Maturity: Fair Value | 348,118 | 344,880
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,754,582 |
Available-for-Sale: Amortized Cost | 1,754,582 | 1,689,729
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,580,595 |
Available-for-Sale: Fair Value | 1,580,595 | 1,473,377
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 4,567,853 | 4,854,110
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 4,567,853 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 3,943,949 |
Held-to-Maturity: Fair Value | $ 3,943,949 | $ 4,127,621

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