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Off-Balance Sheet Loan Commitments (Tables)
12 Months Ended
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, 2021December 31, 2020
(Dollars in thousands)Fixed RateVariable RateTotalFixed RateVariable RateTotal
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 $417,722 
Securities Borrowed, Allowance for Credit Loss The following table presents credit loss expense for off balance sheet credit exposures:
Twelve Months Ended December 31,
(Dollars in thousands)202120202019
Credit loss expense (benefit)$(922)$2,448 $99