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Off-Balance Sheet Risk (Tables)
12 Months Ended
Dec. 31, 2024
Off-Balance-Sheet, Credit Loss, Liability [Abstract]  
Summary of Loan Commitments and Standby Letters of Credit
The total amounts of loan commitments and standby letters of credit at December 31 were:
 (Dollars in thousands)
20242023
Home equity lines of credit$254,168 $244,367 
Unadvanced construction loans370,086 349,850 
Other loan commitments759,790 769,759 
Loan commitments1,384,044 1,363,976 
Standby letters of credit$8,398 $14,318