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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2022
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, 2022December 31, 2021
 (Dollars in thousands)
Commitments to extend credit$4,480,447 $4,535,895 
Standby letters of credit24,416 24,412 
Deferred standby letter of credit fees171 124 
Loan exposures sold with recourse186,426 202,717