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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
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, 2021December 31, 2020
 (Dollars in thousands)
Commitments to extend credit$3,561,078 $3,301,692 
Standby letters of credit20,385 20,686 
Deferred standby letter of credit fees169 164 
Loan exposures with recourse261,713 303,265