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INCOME AND FRANCHISE TAXES (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of components of income tax expense (benefit)

	Current				Deferred				Total
	(Dollars in thousands)
Year ended December 31, 2015
Federal	$	1,128			$	20,061			$	21,189
State	(119		)		6,018				5,899
Total	$	1,009			$	26,079			$	27,088

Components of income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 were as follows:

	Current				Deferred				Total
	(Dollars in thousands)
Year ended December 31, 2017
Federal	$	1,727			$	27,263			$	28,990
State	(81		)		4,943				4,862
Total	$	1,646			$	32,206			$	33,852

	Current				Deferred				Total
	(Dollars in thousands)
Year ended December 31, 2016
Federal	$	805			$	19,842			$	20,647
State	(4		)		4,585				4,581
Total	$	801			$	24,427			$	25,228

Schedule of the reasons of difference between the income tax expense (benefit) and the expected tax expense

Income tax expense (benefit) for the periods presented differed from the "expected" tax expense (computed by applying the U.S. federal corporate tax rate of 35% to income (loss) before income taxes) for the following reasons:

	Year Ended December 31,
	2017				2016				2015
	(Dollars in thousands)
Computed "expected" tax expense (benefit)	$	26,270			$	25,260			$	25,535
Increase (decrease) in taxes resulting from:
Tax-exempt interest	(1,387		)		(1,410		)		(1,420		)
Other tax-exempt income	(1,186		)		(940		)		(712		)
Low-income housing and energy tax credits	(1,135		)		(899		)		(946		)
State income taxes, net of Federal income tax effect, excluding impact of deferred tax valuation allowance	3,145				2,981				3,834
Change in the beginning-of-the-year balance of the valuation allowance for deferred tax assets allocated to income tax expense	570				(52		)		(44		)
Estimated impact of Tax Reform on net deferred tax assets	7,440				—				—
Other, net	135				288				841
Total	$	33,852			$	25,228			$	27,088

Schedule of the tax effects of temporary differences giving rise to significant portions of the deferred tax assets and deferred tax liabilities

The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows:

	December 31,
	2017				2016
	(Dollars in thousands)
Deferred tax assets
Allowance for loan and lease losses	$	10,622			$	19,926
Accrued expenses	294				644
Employee retirement benefits	2,784				6,138
Federal and state tax credit carryforwards	12,473				33,803
Federal and state net operating loss carryforwards	3,306				2,732
Restricted stock and non-qualified stock options	661				412
Premises and equipment	3,633				4,106
Other	3,169				5,060
Total deferred tax assets	36,942				72,821
Deferred tax liabilities
Intangible assets	4,785				8,138
Other	2,343				3,006
Total deferred tax liabilities	7,128				11,144
Less: Deferred tax valuation allowance	3,321				2,751
Net deferred tax assets	$	26,493			$	58,926

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- Definition

Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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