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v3.20.4

Other Borrowings and Subordinated Debentures (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 31, 2019 | Oct. 30, 2019 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of subordinated debentures |  |  | $ 7,442,000 | $ 0 | $ 113,990,000 |  |  |
Advances from Federal Home Loan Banks |  |  | 1,310,000,000 |  |  |  |  |
Mortgage loans and investment securities securing FHLB advances |  |  | 5,600,000,000 |  |  |  |  |
Additional advances from Federal Home Loan Bank |  |  | 2,700,000,000 |  |  |  |  |
FHLB advances outstanding |  |  | 0 |  |  |  |  |
Assets |  |  | 22,359,752,000 | $ 21,259,143,000 |  |  |  | $ 15,000,000,000
Federal Home Loan Bank Owns the Options (FOTO) Advances |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 1,300,000,000 |  |  |  |  |
Federal Home Loan Bank Owns the Options (FOTO) Advances | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  |  | 10 years |  |  |  |  |
Federal Home Loan Bank Owns the Options (FOTO) Advances | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  |  | 15 years |  |  |  |  |
Landrum Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures |  |  |  |  |  | $ 33,917,000 | $ 34,794,000 |
Repayments of subordinated debentures |  | $ 5,900,000 |  |  |  |  |  |
Subordinated Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount of debt | $ 330,000,000.0 |  |  |  |  |  |  |
Debt instrument, interest rate | 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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