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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2023
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:
September 30, 2023December 31, 2022
 (Dollars in thousands)
Commitments to extend credit$4,651,504 $4,566,041 
Loan exposures sold with recourse156,142 167,274 
Standby letters of credit24,093 24,941 
Deferred standby letter of credit fees206 168