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v3.19.3

Other Borrowings and Subordinated Notes and Debentures - Textual (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Mar. 31, 2018 | Oct. 31, 2017 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Line Items] |  |  |  |  |  |
FHLB advances outstanding |  |  |  | $ 1,090,000,000.00 |  |
FHLB advances |  |  |  | 1,100,000,000 |  |
Additional advances from FHLB |  |  |  | 3,100,000,000 |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee on unused portion (as percent) |  |  | 0.25% |  |  |
Long-term debt |  |  |  | 1,452,618,000 | $ 1,699,400,000 |
Mortgage loans and investment securities securing FHLB advances |  |  |  | 5,400,000,000 |  |
Assets |  |  |  | 17,758,511,000 | 16,543,337,000 | $ 15,000,000,000
U.S. Bank National Association | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000.0 |  | $ 75,000,000.0 |  |  |
Commitment fee on unused portion (as percent) | 0.30% |  |  |  |  |
Long-term debt |  |  |  | $ 0 | $ 0 |
London Interbank Offered Rate (LIBOR) | U.S. Bank National Association | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate (as percent) |  |  |  | 1.50% |  |
Federal Home Loan Bank Owns the Options (FOTO) Advances |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
FHLB advances outstanding |  |  |  | $ 1,030,000,000.00 |  |
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 |  |
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% |  |  |  |

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