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Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | $ 90,967 | $ 109,230 | $ 82,181 | $ 90,967 | $ 90,967 | $ 78,789 |  | $ 78,789
"Day 2" provision for credit losses on unfunded commitments acquired from GrandSouth |  | 1,200 | 5,100 |  | 16,351 | 8,600 |  | 12,600
Charge-offs |  | (3,203) | (1,205) |  | (7,575) | (4,008) |  | (4,465)
Recoveries |  | 971 | 511 |  | 2,845 | 3,206 |  | 4,043
Ending balance |  | 108,198 | 86,587 | 109,230 | 108,198 | 86,587 |  | 90,967
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance | 13,306 |  |  | 13,306 | 13,306 | 13,506 |  | 13,506
"Day 2" provision for credit losses on unfunded commitments acquired from GrandSouth |  |  |  | (200) | (3,408) |  | $ (1,200) |
Charge-offs |  |  |  | 0 | 0 |  | 0 |
Recoveries |  |  |  | 0 | 0 |  | 0 |
Ending balance |  | $ 11,819 | $ 12,306 |  | 11,819 | $ 12,306 |  | $ 13,306
Unfunded Loan Commitment | GrandSouth |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
"Day 2" provision for credit losses on unfunded commitments acquired from GrandSouth | $ 1,900 |  |  | $ 0 | $ 1,921 |  | $ 0 |

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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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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