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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
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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