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v3.20.2

Other Borrowings and Subordinated Notes and Debentures - Textual (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Oct. 31, 2019 | Oct. 30, 2019 | Dec. 31, 2017
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
FHLB advances outstanding |  |  | $ 1,300,000,000 |  |  |  |  |
FHLB advances |  |  | 1,310,000,000 |  |  |  |  |
Additional advances from FHLB |  |  | 2,500,000,000 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of subordinated debentures |  |  | 5,927,000 | $ 0 |  |  |  |
Mortgage loans and investment securities securing FHLB advances |  |  | 5,900,000,000 |  |  |  |  |
Assets |  |  | $ 21,437,395,000 |  | $ 21,259,143,000 |  |  | $ 15,000,000,000
Subordinated debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures | $ 330,000,000.0 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Federal Home Loan Bank Owns the Options (FOTO) Advances | Minimum |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Debt term |  |  | 10 years |  |  |  |  |
Federal Home Loan Bank Owns the Options (FOTO) Advances | Maximum |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Debt term |  |  | 15 years |  |  |  |  |
Federal Home Loan Bank Advances |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Debt term |  |  | 1 year |  |  |  |  |
Landrum Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures |  |  |  |  |  | $ 33,917,000 | $ 34,794,000 |
Repayments of subordinated debentures |  | $ 5,900,000 |  |  |  |  |  |

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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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