Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of Outstanding Commitments to Extend Credit and Letters of Credit

The outstanding amounts of commitments to extend credit and letters of credit were as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Commitments to extend credit	$	6,418,380	$	6,205,029
Standby letters of credit	318,827		326,973
Commercial letters of credit	43,709		41,801