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Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
The following table presents the commitments to extend credit and unfunded commitments as of December 31, 2020 and 2019:
(Dollars in thousands)20202019
Unused commitments to extend credit$12,098,417 $10,682,378 
Standby letters of credit129,819 99,601