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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Provision (Benefit)

The income tax provision for the years ended December 31 is as follows:

	2017				2016				2015
	(dollars in thousands)
Current tax provision
Federal	$	29,071			$	19,879			$	8,610
State	274				154				68
Total current tax provision	29,345				20,033				8,678
Deferred tax provision (benefit):
Federal	19,237				5,846				12,158
State	(21		)		(240		)		—
Total deferred tax provision	19,216				5,606				12,158
Total tax provision	$	48,561			$	25,639			$	20,836

Schedule of Effective Income Tax Rate Reconciliation

The statutory to effective tax rate reconciliation for the years ended December 31 is as follows:

	2017							2016							2015
	Amount				% of Pretax Income			Amount				% of Pretax Income			Amount				% of Pretax Income
	(dollars in thousands)
Tax at statutory rate	$	36,304			35	%		$	29,830			35	%		$	24,843			35	%
Increase (decrease) resulting from:
State income tax, net of federal benefit	164				—			(56		)		—			44				—
Income from bank owned life insurance	(1,995		)		(2	)		(1,883		)		(2	)		(1,894		)		(3	)
Tax-exempt interest income, net	(2,709		)		(3	)		(2,434		)		(3	)		(2,232		)		(3	)
Tax credits	(11		)		—			—				—			(61		)		—
Enactment of federal tax reform	16,709				17			—				—			—				—
Other	99				—			182				—			136				—
Total tax provision	$	48,561			47	%		$	25,639			30	%		$	20,836			29	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences between the financial statement carrying amounts and the tax bases of assets and liabilities that represent significant portions of the deferred tax assets and liabilities at December 31 are presented below:

	2017				2016
	(dollars in thousands)
Deferred tax assets:
Allowance for credit losses	$	10,223			$	17,616
Postretirement benefits other than pensions	345				611
Alternative minimum tax credit carryforward	201				—
Unrealized loss on securities available for sale	2,091				3,905
Net operating loss carryforward	6,145				—
Writedown of other real estate owned	878				1,266
Deferred compensation	1,514				1,966
Accrued interest on nonaccrual loans	1,017				1,701
Accrued incentives	1,277				2,627
Unfunded loan commitments & other reserves	1,098				1,452
Deferred rent	801				1,285
Other	1,224				1,966
Total deferred tax assets	26,814				34,395
Deferred tax liabilities:
Income from unconsolidated subsidiary	(380		)		(623		)
Depreciation of assets	(587		)		(28		)
Other	(338		)		(429		)
Total deferred tax liabilities	(1,305		)		(1,080		)
Net deferred tax asset	$	25,509			$	33,315

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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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- Definition

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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