Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Loan Commitments and Letters of Credit

	December 31,
(in thousands)	2018		2017
Letters of credit *	$	157,675	$	153,372
Commitments to fund commercial and industrial loans	5,527,017		5,090,827
Commitments to fund commercial real estate, construction, and land development loans	2,034,223		1,567,583
Commitments under home equity lines of credit	1,258,657		1,137,714
Unused credit card lines	775,003		779,254
Other loan commitments	400,983		351,358
Total letters of credit and unfunded lending commitments	$	10,153,558	$	9,080,108
Investments in low income housing tax credit partnerships:
Carrying amount included in other assets	$	83,736	$	60,068
Amount of future funding commitments included in carrying amount	47,123		39,994
Short-term construction loans and letter of credit commitments	1,585		7,180
Funded portion of short-term loans and letters of credit	5,595		—

* Represent the contractual amount net of risk participations of $46.0 million.