Commitments, Guarantees, and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments Disclosure

Contractual or Notional Amounts of Financial Instruments

(Dollar amounts in thousands)

	As of December 31,
	2017		2016
Commitments to extend credit:
Commercial, industrial, and agricultural	$	1,729,426	$	1,522,152
Commercial real estate	377,551		397,423
Home equity	514,973		426,384
Other commitments (1)	244,222		214,943
Total commitments to extend credit	$	2,866,172	$	2,560,902
Letters of credit	$	128,801	$	100,430

⁽¹⁾  Other commitments includes installment and overdraft protection program commitments.