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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 21,821 |
Due After One Year Through Five Years | 433,974 |
Due After Five Years Through Ten Years | 481,799 |
Amortized Cost, Total | 937,594 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 2,642,728 | $ 2,694,012
Due in One Year or Less | 21,211 |
Due After One Year Through Five Years | 403,727 |
Due After Five Years Through Ten Years | 446,973 |
Fair Value, Total | 871,911 |
Available-for-Sale: Fair Value | 2,352,051 | 2,408,933
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract] |  |
Due in One Year or Less | 485 |
Due After One Year Through Five Years | 82,273 |
Due After Five Year Through Ten Years | 60,191 |
Amortized Cost, Total | 142,949 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 4,913,457 |
Due in One Year or Less | 479 |
Due After One Year Through Five Years | 73,516 |
Due After Five Year Through Ten Years | 50,173 |
Fair Value, Total | 124,168 |
Held-to-Maturity: Fair Value | 4,104,622 | 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 | 60,268 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 60,423 |
Residential - Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 691,565 |
Available-for-Sale: Amortized Cost | 691,565 | 713,918
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 602,276 |
Available-for-Sale: Fair Value | 602,276 | 629,327
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,639,458 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,356,026 |
Held-to-Maturity: Fair Value | 1,356,026 | 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 | 797,610 |
Available-for-Sale: Amortized Cost | 797,610 | 818,296
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 684,573 |
Available-for-Sale: Fair Value | 684,573 | 709,127
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,697,411 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,285,092 |
Held-to-Maturity: Fair Value | 2,285,092 | 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 | 155,691 |
Available-for-Sale: Amortized Cost | 155,691 | 157,515
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 132,868 |
Available-for-Sale: Fair Value | 132,868 | 134,923
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 433,639 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 339,336 |
Held-to-Maturity: Fair Value | 339,336 | 344,880
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,644,866 |
Available-for-Sale: Amortized Cost | 1,644,866 | 1,689,729
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,419,717 |
Available-for-Sale: Fair Value | 1,419,717 | 1,473,377
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 4,770,508 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 3,980,454 |
Held-to-Maturity: Fair Value | $ 3,980,454 | $ 4,127,621

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