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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 1,629 |
Due After One Year Through Five Years | 403,241 |
Due After Five Years Through Ten Years | 533,344 |
Amortized Cost, Total | 938,214 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 2,694,012 | $ 3,172,436
Due in One Year or Less | 1,608 |
Due After One Year Through Five Years | 376,036 |
Due After Five Years Through Ten Years | 491,553 |
Fair Value, Total | 869,197 |
Available-for-Sale: Fair Value | 2,408,933 | 2,844,823
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract] |  |
Due in One Year or Less | 726 |
Due After One Year Through Five Years | 82,259 |
Due After Five Years Through Ten Years | 60,240 |
Amortized Cost, Total | 143,225 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Amortized Cost | 4,997,335 |
Due in One Year or Less | 714 |
Due After One Year Through Five Years | 74,148 |
Due After Five Years Through Ten Years | 51,154 |
Fair Value, Total | 126,016 |
Held-to-Maturity: Fair Value | 4,253,637 | 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 | 66,069 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 66,359 |
Residential - Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 713,918 |
Available-for-Sale: Amortized Cost | 713,918 | 828,798
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 629,327 |
Available-for-Sale: Fair Value | 629,327 | 732,828
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,674,076 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,408,603 |
Held-to-Maturity: Fair Value | 1,408,603 | 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 | 818,296 |
Available-for-Sale: Amortized Cost | 818,296 | 919,980
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 709,127 |
Available-for-Sale: Fair Value | 709,127 | 793,871
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,744,094 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,374,138 |
Held-to-Maturity: Fair Value | 2,374,138 | 2,571,275
Commercial - Government Agencies - Sponsored Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 157,515 |
Available-for-Sale: Amortized Cost | 157,515 | 168,242
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 134,923 |
Available-for-Sale: Fair Value | 134,923 | 145,667
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 435,940 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 344,880 |
Held-to-Maturity: Fair Value | 344,880 | 361,994
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,689,729 |
Available-for-Sale: Amortized Cost | 1,689,729 | 1,917,020
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,473,377 |
Available-for-Sale: Fair Value | 1,473,377 | 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 | 4,854,110 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 4,127,621 |
Held-to-Maturity: Fair Value | $ 4,127,621 | $ 4,487,496

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