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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 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	$ 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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