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Off-Balance Sheet Risk (Tables)
12 Months Ended
Dec. 31, 2023
Off-Balance-Sheet, Credit Loss, Liability [Abstract]  
Schedule 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)
20232022
Home equity lines of credit$244,367 $197,995 
Unadvanced construction loans349,850 270,229 
Other loan commitments769,759 730,015 
Loan commitments1,363,976 1,198,239 
Standby letters of credit$14,318 $15,451