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