Commitments and Contingencies Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016:

(Dollars in thousands)	2017	2016
Unused commitments to extend credit	9,629,365	8,808,218
Standby letters of credit	81,530	83,750
Unfunded commitments for investments in affordable housing projects	61,819	57,079