Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Short-Term Borrowings

The following table sets forth selected information for short-term borrowings (borrowings with an original maturity of less than one year).

(Dollars in thousands)	Year End Weighted Rate		Average Weighted Rate		Average Balance Outstanding		Maximum Outstanding at any Month End		Balance at December 31
Federal funds purchased and repurchase agreements:
2017	.8	%	.7	%	$	1,462,387	$	1,984,071	$	1,507,138
2016	.4		.3		1,266,093		1,723,905		1,723,905
2015	.2		.1		1,654,860		2,193,197		1,963,552