Commitments and Contingencies Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017:

(Dollars in thousands)	2018		2017
Unused commitments to extend credit	$	10,054,712	$	9,629,365
Standby letters of credit	96,467		81,530
Unfunded commitments for investments in affordable housing projects	67,952		61,819