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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity[Abstract]
Due in One Year or Less	$ 972
Due After One Year Through Five Years	214,558
Due After Five Years Through Ten Years	347,391
Due After Ten Years	13,130
Amortized Cost, Total	576,051
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-Sale: Amortized Cost	4,320,884	$ 3,721,636	$ 2,607,636
Due in One Year or Less	978
Due After One Year Through Five Years	215,275
Due After Five Years Through Ten Years	345,996
Due After Ten Years	13,305
Fair Value, Total	575,554
Available-for-Sale: Fair Value	4,276,056	3,791,689	2,619,003
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturities (Abstract]
Due After One Year Through Five Years	16,537
Due After Five Years Through Ten Years	123,996
Due After Ten Years	11,278
Amortized Cost, Total	151,811
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Due After One Year Through Five Years	16,391
Due After Five Years Through Ten Years	123,862
Due After Ten Years	11,029
Fair Value, Total	151,282
Held-to-Maturity: Amortized Cost	4,694,780
Held-to-Maturity: Fair Value	4,646,619	3,348,693	3,062,882
Debt Securities Issued by Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	133,898
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	135,244
Residential - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	1,327,990
Available-for-Sale: Amortized Cost	1,327,990	1,561,603	1,164,466
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	1,319,042
Available-for-Sale: Fair Value	1,319,042	1,594,815	1,172,826
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	1,774,394
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	1,755,912
Held-to-Maturity: Fair Value	1,755,912	948,010	1,075,315
Residential - U.S. Government-Sponsored Enterprises
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	2,127,781
Available-for-Sale: Amortized Cost	2,127,781	1,497,353	584,272
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	2,090,326
Available-for-Sale: Fair Value	2,090,326	1,518,283	586,761
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	2,286,880
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	2,269,761
Held-to-Maturity: Fair Value	2,269,761	2,150,497	1,557,872
Commercial - Government Agencies
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	155,164
Available-for-Sale: Amortized Cost	155,164	243,029	224,372
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	155,890
Available-for-Sale: Fair Value	155,890	253,839	224,720
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	481,695
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	469,664
Held-to-Maturity: Fair Value	469,664	195,900	83,148
Mortgage-Backed Securities
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract]
Available-for-sale Securities: Amortized Cost	3,610,935
Available-for-Sale: Amortized Cost	3,610,935	3,301,985	1,973,110
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value	3,565,258
Available-for-Sale: Fair Value	3,565,258	3,366,937	1,984,307
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract]
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost	4,542,969
Held-to-Maturity: Mortgage-Backed Securities: Fair Value	4,495,337
Held-to-Maturity: Fair Value	$ 4,495,337	$ 3,294,407	$ 2,716,335

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

+ References

No definition available.

+ Details

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- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

+ References

No definition available.

+ Details

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X

- Definition

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach.

+ References

No definition available.

+ Details

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X

- References

No definition available.

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