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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity[Abstract]
Due in One Year or Less	$ 902
Due After One Year Through Five Years	278,482
Due After Five Years Through Ten Years	372,109
Due After Ten Years	13,130
Amortized Cost, Total	664,623
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-Sale: Amortized Cost	4,412,330	$ 4,320,884
Due in One Year or Less	902
Due After One Year Through Five Years	263,219
Due After Five Years Through Ten Years	322,093
Due After Ten Years	11,133
Fair Value, Total	597,347
Available-for-Sale: Fair Value	3,955,476	4,276,056
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract]
Due After One Year Through Five Years	15,022
Due After Five Year Through Ten Years	124,057
Due After Ten Years	11,149
Amortized Cost, Total	150,228
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Due After One Year Through Five Years	14,223
Due After Five Year Through Ten Years	111,628
Due After Ten Years	9,462
Fair Value, Total	135,313
Held-to-Maturity: Amortized Cost	4,321,693
Held-to-Maturity: Fair Value	3,823,739	4,646,619
Debt Securities Issued by Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	116,784
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	118,372
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	118,372
Residential - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	1,348,519
Available-for-Sale: Amortized Cost	1,348,519	1,327,990
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	1,226,339
Available-for-Sale: Fair Value	1,226,339	1,319,042
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	1,605,791
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	1,605,791
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	1,226,339
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	1,432,752
Held-to-Maturity: Fair Value	1,432,752	1,755,912
Residential - U.S. Government-Sponsored Enterprises
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	2,104,396
Available-for-Sale: Amortized Cost	2,104,396	2,127,781
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	1,849,867
Available-for-Sale: Fair Value	1,849,867	2,090,326
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	2,107,997
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	2,107,997
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	1,849,867
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	1,860,580
Held-to-Maturity: Fair Value	1,860,580	2,269,761
Commercial - Government Agencies or Sponsored Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	178,008
Available-for-Sale: Amortized Cost	178,008	155,164
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	163,551
Available-for-Sale: Fair Value	163,551	155,890
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	457,677
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	457,677
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	163,551
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	395,094
Held-to-Maturity: Fair Value	395,094	469,664
Mortgage-Backed Securities
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	3,630,923
Available-for-Sale: Amortized Cost	3,630,923	3,610,935
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	3,239,757
Available-for-Sale: Fair Value	3,239,757	3,565,258
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	4,171,465
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	4,171,465
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	3,239,757
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	3,688,426
Held-to-Maturity: Fair Value	$ 3,688,426	$ 4,495,337

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