Short-term Borrowings (Tables)

12 Months Ended

Dec. 31, 2016

Short-term Debt [Abstract]

Summary of Short-Term Borrowings

Short-term borrowings at December 31 were as follows:

	2016						2015						2014
	Ending Balance		Average Balance		Average Rate		Ending Balance		Average Balance		Average Rate		Ending Balance		Average Balance		Average Rate
	(dollars in thousands)
Federal funds purchased	$	—	$	6,887	0.60	%	$	4,000	$	14,832	0.36	%	$	9,000	$	11,691	0.36	%
Borrowings from FHLB	748,000		1,265,932		0.61		1,400,000		1,117,522		0.42		945,000		644,651		0.31
Securities sold under agreements to repurchase	119,943		114,918		0.23		106,825		120,177		0.23		151,876		159,051		0.24
Total	$	867,943	$	1,387,737	0.58		$	1,510,825	$	1,252,531	0.40		$	1,105,876	$	815,393	0.30
Maximum total at any month-end	$	1,530,678					$	1,510,825					$	1,105,876
Weighted average rate at year-end					0.63	%					0.53	%					0.30	%

Interest Expense on Short-Term Borrowings

Interest expense on short-term borrowings for the years ended December 31 is detailed below:

	2016		2015		2014
	(dollars in thousands)
Federal funds purchased	$	41	$	54	$	42
Borrowings from FHLB	7,765		4,684		2,019
Securities sold under agreements to repurchase	270		280		388
Total interest on short-term borrowings	$	8,076	$	5,018	$	2,449