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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 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:
March 31, 2023December 31, 2022
 (Dollars in thousands)
Commitments to extend credit$4,594,573 $4,566,041 
Loan exposures sold with recourse164,438 167,274 
Standby letters of credit22,850 24,941 
Deferred standby letter of credit fees190 168