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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
 (Dollars in thousands)
Commitments to extend credit$3,258,341 $3,337,930 
Standby letters of credit20,902 21,565 
Deferred standby letter of credit fees191 158 
Loan exposures with recourse343,314 404,532