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Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | $ 134,771 |  |
Charge-offs |  |  | (14,136) |  | $ (43,215)
Ending Balance | $ 139,778 |  | 139,778 |  | 134,771
Commercial and industrial |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (6,185) |  | (35,789)
Commercial - investor owned |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (305) |  | (4,869)
Commercial - owner occupied |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (2,788) |  |
Construction and land development |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (3,224) |  | (9)
Other |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Charge-offs |  |  | (239) |  | (793)
Noncovered Loans |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 139,464 | $ 141,319 | 134,771 | $ 136,932 | 136,932
Provision (benefit) for credit losses | 4,164 | 7,670 | 15,326 | 14,766 |
Charge-offs | (4,773) | (8,303) | (14,136) | (13,451) |
Recoveries | 923 | 1,447 | 3,817 | 3,886 |
Ending Balance | 139,778 | 142,133 | 139,778 | 142,133 | 134,771
Noncovered Loans | Commercial and industrial |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 61,478 | 60,318 | 58,886 | 53,835 | 53,835
Provision (benefit) for credit losses | 2,360 | 3,914 | 9,146 | 12,854 |
Charge-offs | (440) | (2,794) | (6,349) | (6,790) |
Recoveries | 662 | 1,038 | 2,377 | 2,577 |
Ending Balance | 64,060 | 62,476 | 64,060 | 62,476 | 58,886
Noncovered Loans | Commercial - investor owned |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 31,903 | 33,876 | 31,280 | 36,191 | 36,191
Provision (benefit) for credit losses | 1,050 | 2,851 | 1,914 | 653 |
Charge-offs | 0 | (4,692) | (305) | (4,869) |
Recoveries | 30 | 27 | 94 | 87 |
Ending Balance | 32,983 | 32,062 | 32,983 | 32,062 | 31,280
Noncovered Loans | Commercial - owner occupied |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 24,316 | 22,700 | 23,405 | 22,752 | 22,752
Provision (benefit) for credit losses | (935) | 2,705 | 1,818 | 2,564 |
Charge-offs | (906) | 0 | (2,773) | 0 |
Recoveries | 25 | 28 | 50 | 117 |
Ending Balance | 22,500 | 25,433 | 22,500 | 25,433 | 23,405
Noncovered Loans | Construction and land development |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 11,504 | 12,795 | 10,198 | 11,444 | 11,444
Provision (benefit) for credit losses | 1,766 | (1,662) | 3,042 | (342) |
Charge-offs | (3,224) | 0 | (3,224) | (9) |
Recoveries | 21 | 14 | 51 | 54 |
Ending Balance | 10,067 | 11,147 | 10,067 | 11,147 | 10,198
Noncovered Loans | Residential |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 5,588 | 7,421 | 6,142 | 7,928 | 7,928
Provision (benefit) for credit losses | 266 | (939) | (415) | (1,472) |
Charge-offs | (19) | (131) | (760) | (654) |
Recoveries | 140 | 271 | 1,008 | 820 |
Ending Balance | 5,975 | 6,622 | 5,975 | 6,622 | 6,142
Noncovered Loans | Other |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning Balance | 4,675 | 4,209 | 4,860 | 4,782 | 4,782
Provision (benefit) for credit losses | (343) | 801 | (179) | 509 |
Charge-offs | (184) | (686) | (725) | (1,129) |
Recoveries | 45 | 69 | 237 | 231 |
Ending Balance | $ 4,193 | $ 4,393 | $ 4,193 | $ 4,393 | $ 4,860

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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