Income Taxes (Tables)

6 Months Ended

Jun. 30, 2015

Income Tax Disclosure [Abstract]

Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate

Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statements of income for the three and six months ended June 30:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(dollars in thousands)	2015			2014			2015			2014
Provision at statutory rate of 35%	$	12,290		$	9,251		$	22,836		$	21,764
Tax-exempt income		(3,930	)		(3,422	)		(7,783	)		(6,559	)
State income taxes		520			182			1,796			825
Interim period effective rate adjustment		314			2,149			1,821			124
State statutory rate change		—			(218	)		—			904
Other, net		(235	)		(284	)		(486	)		(158	)
Income tax expense	$	8,959		$	7,658		$	18,184		$	16,900
Effective tax rate		25.5	%		29.0	%		27.9	%		27.2	%

Summary of Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

(dollars in thousands)	2015		2014
Balance at January 1,	$	77	$	3,847
Additions (reductions) based on tax positions related to the current year		27		21
Balance at June 30,	$	104	$	3,868