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Off-Balance Sheet Loan Commitments (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 |  | December 31, 2020
(Dollars in thousands) | Fixed Rate |  | Variable Rate |  | Total |  | Fixed Rate |  | Variable Rate |  | Total
Unused lines of credit | $ | 26,029 |  |  | $ | 523,483 |  |  | $ | 549,512 |  |  | $ | 43,406 |  |  | $ | 547,430 |  |  | $ | 590,836 |
Standby letters of credit | $ | 11,090 |  |  | $ | 5,409 |  |  | $ | 16,499 |  |  | $ | 5,464 |  |  | $ | 8,429 |  |  | $ | 13,893 |
Commitments to purchase loans | $ | — |  |  | $ | 108,423 |  |  | $ | 108,423 |  |  | $ | — |  |  | $ | 66,373 |  |  | $ | 66,373 |
Mortgage warehouse commitments | $ | — |  |  | $ | 823,060 |  |  | $ | 823,060 |  |  | $ | — |  |  | $ | 417,722 |  |  | $ | 417,722 |
Securities Borrowed, Allowance for Credit Loss | The following table presents credit loss expense for off balance sheet credit exposures:
| Twelve Months Ended December 31,
(Dollars in thousands) | 2021 |  | 2020 |  | 2019
Credit loss expense (benefit) | $ | (922) |  |  | $ | 2,448 |  |  | $ | 99 |

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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 http://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 http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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