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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,890,763 | $ 4,338,671
Debt Securities, Available-for-sale, Unrealized Gain | 5,416 | 28,850
Debt Securities, Available-for-sale, Unrealized Loss | (115,376) | (35,506)
Debt Securities, Available-for-sale |  | 4,332,015
Investment securities AFS, at fair value | 2,780,803 | 4,332,015
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,939,920 | 2,239,003
Held-to-maturity, Gross Unrealized Gains | 100,167 | 118,471
Held-to-maturity, Gross Unrealized Loss | (275,186) | (8,809)
Held-to-maturity, Fair Value | 3,764,901 | 2,348,664
Fair Value, Inputs, Level 2 |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 2,664,671 | 4,209,058
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,938,857 | 2,237,947
Held-to-maturity, Fair Value | 3,763,872 | 2,347,608
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other Debt securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 2,973 | 2,994
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 168,978 | 177,325
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 5,845 | 6,580
Fair Value, Inputs, Level 1 |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 116,132 | 122,957
FNMA/FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 1,894,819 | 2,691,879
FNMA/FHLMC | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 19,786 | 350,623
Government National Mortgage Association (GNMA) [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Residential Related Securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 58,909 | 67,780
Government National Mortgage Association (GNMA) [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commercial mortgage-related securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 126,760 | 166,799
US Treasury Securities [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 124,328 | 124,291
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (8,196) | (1,334)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 998 | 1,000
Held-to-maturity, Gross Unrealized Gains | 0 | 1
Held-to-maturity, Gross Unrealized Loss | (34) | 0
Held-to-maturity, Fair Value | 964 | 1,001
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale |  | 122,957
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 116,132 | 122,957
Agency Securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 15,000 | 15,000
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | (800) | (103)
Agency Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 14,200 | 14,897
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 368,831 | 381,517
Debt Securities, Available-for-sale, Unrealized Gain | 3,764 | 18,940
Debt Securities, Available-for-sale, Unrealized Loss | (195) | 0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,696,536 | 1,628,759
Held-to-maturity, Gross Unrealized Gains | 32,201 | 113,179
Held-to-maturity, Gross Unrealized Loss | (80,896) | (1,951)
Held-to-maturity, Fair Value | 1,647,842 | 1,739,988
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 372,401 | 400,457
Residential Related Securities | FNMA/FHLMC |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,993,893 | 2,709,399
Debt Securities, Available-for-sale, Unrealized Gain | 937 | 3,729
Debt Securities, Available-for-sale, Unrealized Loss | (100,011) | (21,249)
Debt Securities, Available-for-sale | 1,894,819 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 956,470 | 34,347
Held-to-maturity, Gross Unrealized Gains | 35,739 | 1,792
Held-to-maturity, Gross Unrealized Loss | (72,418) | 0
Held-to-maturity, Fair Value | 919,790 | 36,139
Residential Related Securities | Government National Mortgage Association (GNMA) [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 59,470 | 66,189
Debt Securities, Available-for-sale, Unrealized Gain | 166 | 1,591
Debt Securities, Available-for-sale, Unrealized Loss | (726) | 0
Debt Securities, Available-for-sale | 58,909 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 44,742 | 48,053
Held-to-maturity, Gross Unrealized Gains | 116 | 1,578
Held-to-maturity, Gross Unrealized Loss | (643) | 0
Held-to-maturity, Fair Value | 44,215 | 49,631
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 0 | 332,028
Debt Securities, Available-for-sale, Unrealized Gain |  | 31
Debt Securities, Available-for-sale, Unrealized Loss |  | (2,335)
Debt Securities, Available-for-sale | 0 | 329,724
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 384,016 |
Held-to-maturity, Gross Unrealized Gains | 13,460 |
Held-to-maturity, Gross Unrealized Loss | (28,955) |
Held-to-maturity, Fair Value | 368,521 |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Residential Related Securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 384,016 |
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale | 0 | 329,724
Commercial mortgage-related securities | FNMA/FHLMC |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 19,290 | 357,240
Debt Securities, Available-for-sale, Unrealized Gain | 496 | 2,686
Debt Securities, Available-for-sale, Unrealized Loss | 0 | (9,302)
Debt Securities, Available-for-sale | 19,786 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 764,775 | 425,937
Held-to-maturity, Gross Unrealized Gains | 17,620 | 122
Held-to-maturity, Gross Unrealized Loss | (88,784) | (6,659)
Held-to-maturity, Fair Value | 693,610 | 419,400
Commercial mortgage-related securities | Government National Mortgage Association (GNMA) [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 128,019 | 165,439
Debt Securities, Available-for-sale, Unrealized Gain | 18 | 1,360
Debt Securities, Available-for-sale, Unrealized Loss | (1,278) | 0
Debt Securities, Available-for-sale | 126,760 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 92,383 | 100,907
Held-to-maturity, Gross Unrealized Gains | 1,032 | 1,799
Held-to-maturity, Gross Unrealized Loss | (3,456) | (200)
Held-to-maturity, Fair Value | 89,959 | 102,506
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 173,068 | 177,974
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 475
Debt Securities, Available-for-sale, Unrealized Loss | (4,090) | (1,123)
Debt Securities, Available-for-sale | 168,978 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |
Held-to-maturity, Fair Value | 0 |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,865 | 6,594
Debt Securities, Available-for-sale, Unrealized Gain | 33 | 39
Debt Securities, Available-for-sale, Unrealized Loss | (53) | (54)
Debt Securities, Available-for-sale | 5,845 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |
Held-to-maturity, Fair Value | 0 |
Other Debt securities |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,000 | 3,000
Debt Securities, Available-for-sale, Unrealized Gain | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss | $ (27) | $ (6)

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