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Investment Securities - Analysis of the Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Rolling Maturity[Abstract] |  |
Due in One Year or Less | $ 694 |
Due After One Year Through Five Years | 279,784 |
Due After Five Years Through Ten Years | 372,250 |
Due After Ten Years | 13,130 |
Amortized Cost, Total | 665,858 |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-Sale: Amortized Cost | 4,548,509 | $ 4,320,884
Due in One Year or Less | 696 |
Due After One Year Through Five Years | 271,681 |
Due After Five Years Through Ten Years | 345,146 |
Due After Ten Years | 12,012 |
Fair Value, Total | 629,535 |
Available-for-Sale: Fair Value | 4,258,534 | 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 | 15,781 |
Due After Five Year Through Ten Years | 124,026 |
Due After Ten Years | 11,215 |
Amortized Cost, Total | 151,022 |
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Due After One Year Through Five Years | 15,127 |
Due After Five Year Through Ten Years | 115,993 |
Due After Ten Years | 10,143 |
Fair Value, Total | 141,263 |
Held-to-Maturity: Amortized Cost | 4,489,615 |
Held-to-Maturity: Fair Value | 4,171,262 | 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 | 125,370 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 126,603 |
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 | 126,603 |
Residential - Government Agencies |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 1,368,122 |
Available-for-Sale: Amortized Cost | 1,368,122 | 1,327,990
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,291,150 |
Available-for-Sale: Fair Value | 1,291,150 | 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 | 1,681,326 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 1,681,326 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 1,291,150 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 1,565,974 |
Held-to-Maturity: Fair Value | 1,565,974 | 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 | 2,201,086 |
Available-for-Sale: Amortized Cost | 2,201,086 | 2,127,781
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 2,030,281 |
Available-for-Sale: Fair Value | 2,030,281 | 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 | 2,189,122 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 2,189,122 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 2,030,281 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 2,036,807 |
Held-to-Maturity: Fair Value | 2,036,807 | 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 | 188,073 |
Available-for-Sale: Amortized Cost | 188,073 | 155,164
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 180,965 |
Available-for-Sale: Fair Value | 180,965 | 155,890
Held-to-Maturity Securities, Debt Maturities, Single Maturity Date, Fair Value, Rolling Maturities [Abstract] |  |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 468,145 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 468,145 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 180,965 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 427,218 |
Held-to-Maturity: Fair Value | 427,218 | 469,664
Mortgage-Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturities [Abstract] |  |
Available-for-sale Securities: Amortized Cost | 3,757,281 |
Available-for-Sale: Amortized Cost | 3,757,281 | 3,610,935
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 3,502,396 |
Available-for-Sale: Fair Value | 3,502,396 | 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 | 4,338,593 |
Held-to-Maturity: Mortgage-Backed Securities: Amortized Cost | 4,338,593 |
Available-for-sale Securities, Debt Securities Issued by Government Agencies and Mortgage-Backed Securities: Fair Value | 3,502,396 |
Held-to-Maturity: Mortgage-Backed Securities: Fair Value | 4,029,999 |
Held-to-Maturity: Fair Value | $ 4,029,999 | $ 4,495,337

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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 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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- References No definition available. + Details
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