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v3.21.2

Other Borrowings and Subordinated Notes and Debentures - Textual (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 | Sep. 30, 2021
Debt Instrument [Line Items] |  |
FHLB advances |  | $ 1,310,000,000
FHLB advances outstanding |  | 1,300,000,000
Mortgage loans and investment securities securing FHLB advances |  | 4,400,000,000
Additional advances from FHLB |  | $ 3,000,000,000
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%
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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