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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investment Securities, Gross Amortized Cost |  | $ 2,903,116 |  | $ 210,999
Investment Securities, Gross Carrying Value |  | 2,638,062 | [1] | 210,999
Investment securities, Allowance for Credit Loss |  | (717) | [1] | (555)
Investment Securities, Amortized Cost, After Allowance for Credit Loss |  | 2,902,399 |  | 210,444
Investment Securities, Carrying Value, after Allowance for Credit Loss |  | 2,637,345 | [1] | 210,444
Investment Securities, Fair Value |  | 2,607,757 |  | 231,395
Investment Securities, Gross Unrealized Gain |  | 6,091 |  | 20,412
Investment Securities, Gross Unrealized Loss |  | (36,396) |  | $ (16)
Debt Securities, Net Unrealized Loss Remaining in AOCI included in Carrying Value for AFS Securities Transferred to Investment Securities |  | 265,000 |  |
Transfer of available for sale securities to investment securities |  | 2,400,000 |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Transfer, Amount |  | 2,700,000 |  |
Debt Securities, Held-to-maturity, Transfer, Unrealized Gain (Loss) |  | $ 268,000 |  |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 175 |  | 3
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 2,451,661 |  | $ 273
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 550 |  | 587
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 2,452,211 |  | 860
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 36,319 |  | 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 77 |  | 14
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 36,396 |  | 16
Fixed Maturity Securities [Member] |  |  |  |
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 14,890 |  |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 105,177 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 67,111 |  |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 5,039 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 192,217 |  |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 15,018 |  |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 110,157 |  |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 66,625 |  |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 5,031 |  |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | $ 196,831 |  |
Investment Securities, Debt Maturities, Weighted Average Maturity | [2] | 4.49 |  |
Municipal securities [Member] |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investment Securities, Gross Amortized Cost |  | $ 175,974 |  | 203,772
Investment Securities, Gross Carrying Value |  | 175,974 | [1] | 203,772
Investment Securities, Fair Value |  | 180,783 |  | 223,609
Investment Securities, Gross Unrealized Gain |  | 5,819 |  | 19,851
Investment Securities, Gross Unrealized Loss |  | $ (1,010) |  | $ (14)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 56 |  | 1
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 27,968 |  | $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 527 |  | 587
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 28,495 |  | 587
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 935 |  | 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 75 |  | 14
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1,010 |  | 14
Residential agency mortgage-backed securities [Member] |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investment Securities, Gross Amortized Cost |  | 2,709,094 |  | 6,939
Investment Securities, Gross Carrying Value |  | 2,445,845 | [1] | 6,939
Investment Securities, Fair Value |  | 2,410,926 |  | 7,500
Investment Securities, Gross Unrealized Gain |  | 272 |  | 561
Investment Securities, Gross Unrealized Loss |  | (35,191) |  | 0
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value | [3] | 2,445,845 |  |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 2,410,926 |  |
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 5 years 4 months 24 days |  |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 115 |  |
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 2,408,180 |  |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 |  |
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 2,408,180 |  |
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 35,191 |  |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 |  |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 35,191 |  |
Other debt securities [Member] |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investment Securities, Gross Amortized Cost |  | 788 |  | 288
Investment Securities, Gross Carrying Value |  | 788 | [1] | 288
Investment Securities, Fair Value |  | 769 |  | 286
Investment Securities, Gross Unrealized Gain |  | 0 |  | 0
Investment Securities, Gross Unrealized Loss |  | $ (19) |  | $ (2)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 2 |  | 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 234 |  | $ 273
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 23 |  | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 257 |  | 273
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 17 |  | 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 2 |  | 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 19 |  | $ 2
Commercial agency mortgage-backed securities [Member] |  |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |  |
Investment Securities, Gross Amortized Cost |  | 17,260 |  |
Investment Securities, Gross Carrying Value | [1] | 15,455 |  |
Investment Securities, Fair Value |  | 15,279 |  |
Investment Securities, Gross Unrealized Gain |  | 0 |  |
Investment Securities, Gross Unrealized Loss |  | $ (176) |  |
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 2 |  |
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 15,279 |  |
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 |  |
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 15,279 |  |
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 176 |  |
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 |  |
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 176 |  |
[1] | Carrying value includes $265 million of net unrealized loss which remains in Accumulated other comprehensive income ("AOCI") in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
[2] | Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[3] | The average expected lives of residential mortgage-backed securities were 5.4 years based upon current prepayment assumptions.

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