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Other Borrowings and Subordinated Notes and Debentures - Debt Components (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Total other borrowings and subordinated debt | $ 1,238,053 | $ 1,238,053 | $ 1,338,507 |
FHLB advances, net of discount, due 2024 to 2033, 4.56% to 5.60% secured by real estate loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total other borrowings and subordinated debt | $ 853,154 | $ 853,154 | 953,222 |
FHLB advances, net of discount, due 2024 to 2033, 4.56% to 5.60% secured by real estate loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate (as percent) | 4.56% | 4.56% |  |
FHLB advances, net of discount, due 2024 to 2033, 4.56% to 5.60% secured by real estate loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate (as percent) | 5.60% | 5.60% |  |
Other long-term debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total other borrowings and subordinated debt | $ 18,720 | $ 18,720 | 19,144 |
Total other borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total other borrowings and subordinated debt | $ 871,874 | $ 871,874 | 972,366 |
Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate (as percent) |  |  |  | 5.00%
Subordinated Notes | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate (as percent) |  | 2.15% |  |
Subordinated Notes | SOFR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate (as percent) | 0.26161% | 0.26161% |  |
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 | 330,000 |
Fixed rate (as percent) | 5.00% | 5.00% |  |
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) | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate (as percent) | 2.15% |  |  |
Subordinated Notes | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 37,142 | $ 37,142 | 37,171 |
Fixed rate (as percent) | 6.00% | 6.00% |  |
Subordinated Notes | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) | SOFR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate (as percent) | 5.92% |  |  |
Total subordinated notes and debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total other borrowings and subordinated debt | $ 366,179 | $ 366,179 | 366,141 |
Unamortized debt issuance costs | $ (963) | $ (963) | $ (1,030) |

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