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v3.21.2

Other Borrowings and Subordinated Notes and Debentures - Debt Components (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Total other borrowings and subordinated debt |  | $ 1,721,863 | $ 1,724,941
FHLB advances, net of discount, due 2022 to 2035, 0.23% to 7.37% secured by real estate loans |  |  |
Debt Instrument [Line Items] |  |  |
Total other borrowings and subordinated debt |  | $ 1,306,360 | 1,308,674
FHLB advances, net of discount, due 2022 to 2035, 0.23% to 7.37% secured by real estate loans | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate (as percent) |  | 0.23% |
FHLB advances, net of discount, due 2022 to 2035, 0.23% to 7.37% secured by real estate loans | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate (as percent) |  | 7.37% |
Other long-term debt |  |  |
Debt Instrument [Line Items] |  |  |
Total other borrowings and subordinated debt |  | $ 32,225 | 33,393
Total other borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Total other borrowings and subordinated debt |  | $ 1,338,585 | 1,342,067
Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate (as percent) | 5.00% | 5.00% |
Subordinated Notes | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) | 2.15% |  |
Subordinated Notes | Subordinated notes payable, due 4/1/2028, fixed-to-floating rate (fixed rate of 5.00% through 3/31/2023, floating rate of 2.15% above the three month LIBOR rate, reset quarterly) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 330,000 | 330,000
Subordinated Notes | Subordinated notes payable, due 4/1/2028, fixed-to-floating rate (fixed rate of 5.00% through 3/31/2023, floating rate of 2.15% above the three month LIBOR rate, reset quarterly) | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) |  | 2.15% |
Subordinated Notes | Trust preferred securities, due 9/15/2037, floating rate of 1.37% above the three month LIBOR rate, reset quarterly |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 10,310 | 10,310
Subordinated Notes | Trust preferred securities, due 9/15/2037, floating rate of 1.37% above the three month LIBOR rate, reset quarterly | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) |  | 1.37% |
Subordinated Notes | Trust preferred securities, due 6/6/2037, floating rate of 1.57% above the three month LIBOR rate, reset quarterly, callable without penalty |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 10,310 | 10,310
Subordinated Notes | Trust preferred securities, due 6/6/2037, floating rate of 1.57% above the three month LIBOR rate, reset quarterly, callable without penalty | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) |  | 1.57% |
Subordinated Notes | Trust preferred securities, due 12/15/2035, floating rate of 1.45% above the three month LIBOR rate, reset quarterly, callable without penalty |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 6,702 | 6,702
Subordinated Notes | Trust preferred securities, due 12/15/2035, floating rate of 1.45% above the three month LIBOR rate, reset quarterly, callable without penalty | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) |  | 1.45% |
Subordinated Notes | Trust preferred securities, net of discount, due 6/15/2037, floating rate of 1.85% above the three month LIBOR rate, reset quarterly, callable without penalty |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 25,290 | 25,172
Subordinated Notes | Trust preferred securities, net of discount, due 6/15/2037, floating rate of 1.85% above the three month LIBOR rate, reset quarterly, callable without penalty | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) |  | 1.85% |
Subordinated Notes | Trust preferred securities, net of discount, due 12/15/2036, floating rate of 1.85% above the three month LIBOR rate, reset quarterly, callable without penalty |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 3,036 | 3,023
Subordinated Notes | Trust preferred securities, net of discount, due 12/15/2036, floating rate of 1.85% above the three month LIBOR rate, reset quarterly, callable without penalty | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Floating rate (as percent) |  | 1.85% |
Total subordinated notes and debentures |  |  |
Debt Instrument [Line Items] |  |  |
Total other borrowings and subordinated debt |  | $ 383,278 | 382,874
Unamortized debt issuance costs |  | $ (2,370) | $ (2,643)

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