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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 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 | $ 43,387 |
Due After One Year Through Five Years | 709,471 |
Due After Five Years Through Ten Years | 183,649 |
Amortized Cost, Total | 936,507 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 2,947,415 | $ 2,694,012
Due in One Year or Less | 42,757 |
Due After One Year Through Five Years | 687,128 |
Due After Five Years Through Ten Years | 157,502 |
Fair Value, Total | 887,387 |
Available-for-Sale: Fair Value | 2,689,528 | 2,408,933
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract] |  |
Due in One Year or Less | 7,500 |
Due After One Year Through Five Years | 74,815 |
Due After Five Years Through Ten Years | 60,043 |
Amortized Cost, Total | 142,358 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 4,618,543 | 4,997,335
Due in One Year or Less | 7,272 |
Due After One Year Through Five Years | 67,951 |
Due After Five Years Through Ten Years | 50,052 |
Fair Value, Total | 125,275 |
Held-to-Maturity: Fair Value | 3,820,882 | 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 | 98,821 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 98,683 |
Residential - Government Agencies or Sponsored Enterprises |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,050,299 |
Available-for-Sale: Amortized Cost | 1,050,299 | 892,513
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 935,220 |
Available-for-Sale: Fair Value | 935,220 | 774,363
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,185,210 |
Held-to-Maturity: Amortized Cost | 2,185,210 | 2,383,375
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,808,064 |
Held-to-Maturity: Fair Value | 1,808,064 | 2,022,083
Commercial - Government Agencies or Sponsored Enterprises |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 306,696 |
Available-for-Sale: Amortized Cost | 306,696 | 157,515
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 283,474 |
Available-for-Sale: Fair Value | 283,474 | 134,923
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 416,389 |
Held-to-Maturity: Amortized Cost | 416,389 | 425,935
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 324,178 |
Held-to-Maturity: Fair Value | 324,178 | 337,003
Collateralized Mortgage Obligations |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,356,995 |
Available-for-Sale: Amortized Cost | 1,356,995 | 1,050,028
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,218,694 |
Available-for-Sale: Fair Value | 1,218,694 | 909,286
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,601,599 |
Held-to-Maturity: Amortized Cost | 2,601,599 | 2,809,310
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,132,242 |
Held-to-Maturity: Fair Value | 2,132,242 | 2,359,086
Residential - Government Agencies or Sponsored Enterprises |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 555,092 |
Available-for-Sale: Amortized Cost | 555,092 | 639,701
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 484,764 |
Available-for-Sale: Fair Value | 484,764 | 564,091
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,864,591 |
Held-to-Maturity: Amortized Cost | 1,864,591 | 2,034,794
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,555,535 |
Held-to-Maturity: Fair Value | 1,555,535 | 1,760,658
Commercial - Government Agencies or Sponsored Enterprises |  |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 9,995 |
Held-to-Maturity: Amortized Cost | 9,995 | 10,006
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 7,830 |
Held-to-Maturity: Fair Value | 7,830 | 7,877
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 555,092 |
Available-for-Sale: Amortized Cost | 555,092 | 639,701
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 484,764 |
Available-for-Sale: Fair Value | 484,764 | 564,091
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,874,586 |
Held-to-Maturity: Amortized Cost | 1,874,586 | 2,044,800
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,563,365 |
Held-to-Maturity: Fair Value | $ 1,563,365 | $ 1,768,535

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