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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 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:
June 30, 2022December 31, 2021
 (Dollars in thousands)
Commitments to extend credit$4,604,012 $4,535,895 
Standby letters of credit25,445 24,412 
Deferred standby letter of credit fees210 124 
Loan exposures sold with recourse178,510 202,717