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v3.22.1

Other Borrowings and Subordinated Notes and Debentures - Textual (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
FHLB advances |  | $ 1,310,000,000 | $ 1,310,000,000
FHLB advances outstanding |  | 1,300,000,000 |
Mortgage loans and investment securities securing FHLB advances |  | 5,000,000,000 |
Additional advances from FHLB |  | $ 3,600,000,000 |
Federal Home Loan Bank Owns the Options (FOTO) Advances | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt term |  | 10 years |
Federal Home Loan Bank Owns the Options (FOTO) Advances | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt term |  | 15 years |
Subordinated debt |  |  |
Debt Instrument [Line Items] |  |  |
Subordinated debentures | $ 330,000,000 |  |
Fixed rate (as percent) | 5.00% | 5.00% |
Offering price, percent | 100.00% |  |
Debt issuance costs | $ 3,600,000 |  |
Subordinated debt | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) | 2.15% |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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