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Off-Balance Sheet Loan Commitments (Tables)
 6 Months Ended
Jun. 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:
June 30, 2023December 31, 2022
(Dollars in thousands)Fixed RateVariable RateTotalFixed RateVariable RateTotal
Unused lines of credit$6,064 $577,064 $583,128 $1,417 $487,965 $489,382 
Standby letters of credit$17,649 $8,398 $26,047 $12,309 $4,897 $17,206 
Commitments to purchase loans$— $37,321 $37,321 $— $53,572 $53,572 
Mortgage warehouse commitments$— $758,651 $758,651 $— $1,055,117 $1,055,117 
Credit Loss Expense for Off Balance Sheet Credit Exposures The following table presents credit loss expense for off balance sheet credit exposures:
Three Months Ended June 30,Six Months Ended June 30,
(Dollars in thousands)2023202220232022
Credit loss expense (benefit)$(1,162)$932 $(343)$196