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Commitments and Contingencies Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:
(Dollars in thousands)
2019
 
2018
Unused commitments to extend credit
$
10,682,378

 
$
10,054,712

Standby letters of credit
99,601

 
96,467