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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] The following table summarizes the above financial instruments at the dates indicated:
March 31, 2024December 31, 2023
 (Dollars in thousands)
Commitments to extend credit$4,704,239 $4,632,105 
Loan exposures sold with recourse150,625 153,850 
Standby letters of credit21,626 21,427 
Deferred standby letter of credit fees190 155