Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of income tax expense

The following table shows the composition of income tax expense:

Year Ended December 31 (Dollars in thousands)	2013			2012			2011
Current:
Federal	$	28,634		$	30,041		$	18,985
State	2,298			3,647			2,975
Total current	30,932			33,688			21,960
Deferred:
Federal	(2,337		)	(7,087		)	3,596
State	390			(554		)	38
Total deferred	(1,947		)	(7,641		)	3,634
Total provision	$	28,985		$	26,047		$	25,594

Schedule of reasons for the difference between income tax expense and the amount computed by applying the statutory federal income tax rate

The following table shows the reasons for the difference between income tax expense and the amount computed by applying the statutory federal income tax rate (35%) to income before income taxes:

	2013					2012					2011
Year Ended December 31 (Dollars in thousands)	Amount			Percent of Pretax Income		Amount			Percent of Pretax Income		Amount			Percent of Pretax Income
Statutory federal income tax	$	29,380		35.0	%	$	26,488		35.0	%	$	25,826		35.0	%
(Decrease) increase in income taxes resulting from:
Tax-exempt interest income	(1,219		)	(1.5	)	(1,370		)	(1.8	)	(1,668		)	(2.3	)
State taxes, net of federal income tax benefit	1,747			2.1		2,010			2.7		1,958			2.7
Other	(923		)	(1.1	)	(1,081		)	(1.5	)	(522		)	(0.7	)
Total	$	28,985		34.5	%	$	26,047		34.4	%	$	25,594		34.7	%

Schedule of Deferred tax assets and liabilities

The following table shows the composition of deferred tax assets and liabilities as of December 31, 2013 and 2012:

(Dollars in thousands)	2013		2012
Deferred tax assets:
Reserve for loan and lease losses	$	32,545	$	32,979
Accruals for employee benefits	4,153		3,590
Other	2,243		1,831
Total deferred tax assets	38,941		38,400
Deferred tax liabilities:
Differing depreciable bases in premises and leased equipment	22,296		23,795
Net unrealized gains on securities available-for-sale	3,956		12,087
Differing bases in assets related to acquisitions	4,725		4,376
Mortgage servicing	1,588		1,493
Capitalized loan costs	816		1,440
Prepaid expenses	931		826
Other	956		781
Total deferred tax liabilities	35,268		44,798
Net deferred tax asset (liability)	$	3,673	$	(6,398	)

Schedule of reconciliation of the beginning and ending amounts of unrecognized tax benefits

The following table shows a reconciliation of the beginning and ending amounts of unrecognized tax benefits:

(Dollars in thousands)	2013			2012			2011
Balance, beginning of year	$	4,068		$	3,387		$	3,424
Additions based on tax positions related to the current year	484			704			419
Additions for tax positions of prior years	1,118			1,471			1,632
Reductions for tax positions of prior years	—			(49		)	(79		)
Reductions due to lapse in statute of limitations	(1,059		)	(1,445		)	(1,165		)
Settlements	—			—			(844		)
Balance, end of year	$	4,611		$	4,068		$	3,387