Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

The following table shows the composition of income tax expense.



Year Ended December 31 (Dollars in thousands)	2015		2014		2013
Current:
Federal	$	26,092	$	20,999	$	28,634
State	3,365		1,034		2,298
Total current	29,457		22,033		30,932
Deferred:
Federal	1,577		4,022		(2,337		)
State	43		319		390
Total deferred	1,620		4,341		(1,947		)
Total provision	$	31,077	$	26,374	$	28,985

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.



	2015					2014					2013
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	$	30,997		35.0	%	$	29,555		35.0	%	$	29,380		35.0	%
(Decrease) increase in income taxes resulting from:
Tax-exempt interest income	(1,152		)	(1.3	)	(1,236		)	(1.5	)	(1,219		)	(1.5	)
State taxes, net of federal income tax benefit	2,215			2.5		2,300			2.7		1,747			2.1
Reduction in uncertain tax positions	—			—		(3,300		)	(3.9	)	—			—
Other	(983		)	(1.1	)	(945		)	(1.1	)	(923		)	(1.1	)
Total	$	31,077		35.1	%	$	26,374		31.2	%	$	28,985		34.5	%

Schedule of Deferred tax assets and liabilities

The following table shows the composition of deferred tax assets and liabilities as of December 31, 2015 and 2014.



(Dollars in thousands)	2015			2014
Deferred tax assets:
Reserve for loan and lease losses	$	34,410		$	33,088
Accruals for employee benefits	3,816			3,346
Other	905			1,079
Total deferred tax assets	39,131			37,513
Deferred tax liabilities:
Differing depreciable bases in premises and leased equipment	27,274			24,506
Net unrealized gains on securities available-for-sale	3,940			5,654
Differing bases in assets related to acquisitions	5,738			5,160
Mortgage servicing	1,630			1,644
Capitalized loan costs	1,454			1,437
Prepaid expenses	1,055			1,035
Other	312			443
Total deferred tax liabilities	41,403			39,879
Net deferred tax liability	$	(2,272	)	$	(2,366	)

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)	2015		2014			2013
Balance, beginning of year	$	—	$	4,611		$	4,068
Additions based on tax positions related to the current year	380		66			484
Additions for tax positions of prior years	—		592			1,118
Reductions for tax positions of prior years	—		(553		)	—
Reductions due to lapse in statute of limitations	—		(1,650		)	(1,059		)
Settlements	—		(3,066		)	—
Balance, end of year	$	380	$	—		$	4,611