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Off-Balance Sheet Loan Commitments (Tables) | 12 Months Ended
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Dec. 31, 2022
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:
| December 31, 2022 |  | December 31, 2021
(Dollars in thousands) | Fixed Rate |  | Variable Rate |  | Total |  | Fixed Rate |  | Variable Rate |  | Total
Unused lines of credit | $ | 1,417 |  |  | $ | 487,965 |  |  | $ | 489,382 |  |  | $ | 26,029 |  |  | $ | 523,483 |  |  | $ | 549,512 |
Standby letters of credit | $ | 12,309 |  |  | $ | 4,897 |  |  | $ | 17,206 |  |  | $ | 11,090 |  |  | $ | 5,409 |  |  | $ | 16,499 |
Commitments to purchase loans | $ | — |  |  | $ | 53,572 |  |  | $ | 53,572 |  |  | $ | — |  |  | $ | 108,423 |  |  | $ | 108,423 |
Mortgage warehouse commitments | $ | — |  |  | $ | 1,055,117 |  |  | $ | 1,055,117 |  |  | $ | — |  |  | $ | 823,060 |  |  | $ | 823,060 |
Securities Borrowed, Allowance for Credit Loss | The following table presents credit loss expense for off balance sheet credit exposures:
| Year Ended December 31,
(Dollars in thousands) | 2022 |  | 2021 |  | 2020
Credit loss expense (benefit) | $ | (476) |  |  | $ | (922) |  |  | $ | 2,448 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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