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Borrowings - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 29, 2021 USD ($) | Oct. 31, 2020 USD ($) | Feb. 29, 2020 USD ($) | Dec. 31, 2021 USD ($) trust | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 05, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds of issuance debt |  |  |  | $ 0 | $ 147,374,000 | $ 0 |  |
Number of wholly-owned, unconsolidated subsidiary grantor trusts | trust |  |  |  | 2 |  |  |  |
FHLB |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net amounts available under the blanket floating lien |  |  |  | $ 982,200,000 | 456,900,000 |  |  |
Line of credit | Federal Reserve Bank of Dallas |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  | 856,800,000 | 793,200,000 |  |  |
Commercial and industrial loans pledged as collateral |  |  |  | 1,090,000,000.00 | 999,700,000 |  |  |
Line of credit outstanding, long-term |  |  |  | $ 0 | $ 0 |  |  |
FHLB advances | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 1.65% | 1.65% |  |  |
FHLB advances | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.57% | 5.72% |  |  |
Line of credit | Revolving credit loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 100,000,000 |  |  |  |  |  | $ 50,000,000 | $ 50,000,000
Line of credit outstanding, long-term |  |  |  | $ 0 | $ 0 |  |  |
Incremental revolving loan maximum | $ 50,000,000 |  |  |  |  |  |  |
Debt instrument, option to extend, term | 364 days |  |  |  |  |  |  |
Line of credit | Revolving credit loans | SOFR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.35% |  |  |  |  |  |  |
Subordinated indebtedness, net |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Rate |  | 4.50% | 4.25% |  |  |  |  |
Basis spread on variable rate |  | 4.32% |  |  |  |  |  |
Principal amount |  | $ 80,000,000 | $ 70,000,000 |  |  |  |  |
Term of floating rate |  | 3 months |  |  |  |  |  |
Proceeds of issuance debt |  | $ 78,600,000 |  |  |  |  |  |
Subordinated indebtedness, net | Origin Bank | Origin Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | 51,000,000 |  |  |
Subordinated indebtedness, net | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.82% |  |  |  |  |
Junior subordinated debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Remaining purchase discount |  |  |  | 3,400,000 | 3,600,000 |  |  |
Line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 140,000,000 | 190,000,000 |  |  |
Line of credit outstanding, short-term |  |  |  | 0 | 0 |  |  |
Amount held on deposit |  |  |  | 250,000 |  |  |  |
secured repurchase line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 75,000,000 | $ 75,000,000 |  |  |
Overnight repurchase agreements with depositors |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Daily average interest rate |  |  |  | 0.08% | 0.22% |  |  |

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