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Off-Balance Sheet Loan Commitments (Tables) | 9 Months Ended
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Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract] |
Summary of Financial Instruments with Off-Balance Sheet Risk | The contractual amounts of financial instruments with off-balance sheet risk were as follows:
| September 30, 2023 |  | December 31, 2022
(Dollars in thousands) | Fixed Rate |  | Variable Rate |  | Total |  | Fixed Rate |  | Variable Rate |  | Total
Unused lines of credit | $ | 15,441 |  |  | $ | 563,103 |  |  | $ | 578,544 |  |  | $ | 1,417 |  |  | $ | 487,965 |  |  | $ | 489,382 |
Standby letters of credit | $ | 15,725 |  |  | $ | 9,809 |  |  | $ | 25,534 |  |  | $ | 12,309 |  |  | $ | 4,897 |  |  | $ | 17,206 |
Commitments to purchase loans | $ | — |  |  | $ | 17,321 |  |  | $ | 17,321 |  |  | $ | — |  |  | $ | 53,572 |  |  | $ | 53,572 |
Mortgage warehouse commitments | $ | — |  |  | $ | 851,564 |  |  | $ | 851,564 |  |  | $ | — |  |  | $ | 1,055,117 |  |  | $ | 1,055,117 |
Credit Loss Expense for Off Balance Sheet Credit Exposures | The following table presents credit loss expense for off balance sheet credit exposures:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(Dollars in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Credit loss expense (benefit) | $ | (253) |  |  | $ | (598) |  |  | $ | (596) |  |  | $ | (402) |

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined) which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of allowance for credit loss on securities borrowed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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