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INCOME TAXES INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense consisted of the following components:

(Dollars in thousands)		2019				2018				2017
Current expense
Federal		$	31,343			$	34,330			$	22,599
State		854				1,029				1,265
Total current expense		32,197				35,359				23,864
Deferred expense (benefit)
Federal		10,946				4,675				(4,657		)
State		1,644				1,592				169
Total deferred expense (benefit)		12,590				6,267				(4,488		)
Income tax expense		$	44,787			$	41,626			$	19,376

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The difference between the federal income tax rates applied to income before income taxes and the effective rates were due to the following:

(Dollars in thousands)		2019				2018				2017
Income taxes computed at federal statutory rate on income before income taxes (21% in 2019 and 2018; 35% in 2017)		$	51,001			$	44,986			$	40,657
Benefit from tax-exempt income		(5,964		)		(4,499		)		(3,427		)
Tax credits		(10,075		)		(5,439		)		(16,806		)
Tax rate reduction impact		0				0				(8,191		)
Basis reduction on tax credit		738				0				4,599
Tax benefit of equity compensation		(140		)		(565		)		(1,449		)
State income taxes, net of federal tax benefit		1,973				2,070				932
Affordable housing investments		5,825				4,725				2,798
Other		1,429				348				263
Income tax expense		$	44,787			$	41,626			$	19,376

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The major components of the temporary differences that gave rise to deferred tax assets and liabilities at December 31, 2019, and 2018, were as follows:

(Dollars in thousands)		2019				2018
Deferred tax assets
Allowance for loan and lease losses		$	13,011			$	12,782
Fair value adjustments on business combinations		6,470				11,199
Deferred compensation		228				392
Postretirement benefits other than pension liability		666				676
Accrued stock-based compensation		1,296				1,145
OREO write-downs		162				118
Interest on nonaccrual loans		548				1,160
Accrued expenses		4,708				5,808
Net unrealized losses on investment securities and derivatives		0				3,221
State net operating loss		2,792				3,119
Leasing liability		14,806				0
Federal tax credit carryforwards		0				873
Other		816				425
Total deferred tax assets		45,503				40,918
Deferred tax liabilities
Tax depreciation in excess of book depreciation		(10,970		)		(9,530		)
FHLB and FRB stock		(4,043		)		(4,044		)
Mortgage-servicing rights		(2,435		)		(2,285		)
Leasing activities		(7,349		)		(3,881		)
Retirement obligation		(8,511		)		(6,614		)
Intangible assets		(11,647		)		(12,310		)
Deferred loan fees and costs		(1,100		)		(131		)
Prepaid expenses		(623		)		(582		)
Limited partnership investments		(2,249		)		(2,367		)
Net unrealized gains on investment securities		(11,359		)		0
Foreign exchange deferred income		(2,845		)		0
Right of use assets		(13,354		)		0
Other		(2,048		)		(1,867		)
Total deferred tax liabilities		(78,533		)		(43,611		)
Total net deferred tax liability		$	(33,030	)		$	(2,693	)

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

A progression of gross unrecognized tax benefits as of December 31, 2019 and 2018 is as follows:

(Dollars in thousands)		2019				2018
Balance at beginning of year		$	3,735			$	3,735
Settlements		(729		)		0
Balance at end of year		$	3,006			$	3,735

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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.

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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.

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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.

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Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination.

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