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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2020

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)						2020						2019						2018
Current expense
Federal						$	34,632					$	31,343					$	34,330
State						2,349						854						1,029
Total current expense						36,981						32,197						35,359
Deferred expense (benefit)
Federal						(8,624)						10,946						4,675
State						244						1,644						1,592
Total deferred expense (benefit)						(8,380)						12,590						6,267
Income tax expense						$	28,601					$	44,787					$	41,626

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)						2020						2019						2018
Income taxes computed at federal statutory rate (21%) on income before income taxes						$	38,726					$	51,001					$	44,986
Benefit from tax-exempt income						(5,901)						(5,964)						(4,499)
Tax credits						(13,064)						(10,075)						(5,439)
Basis reduction on tax credit						657						738						0
Tax expense (benefit) of equity compensation						340						(140)						(565)
State income taxes, net of federal tax benefit						2,049						1,973						2,070
Affordable housing investments						6,635						5,825						4,725
Other						(841)						1,429						348
Income tax expense						$	28,601					$	44,787					$	41,626

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, 2020, and 2019, were as follows:

(Dollars in thousands)						2020						2019
Deferred tax assets
Allowance for credit losses						$	39,671					$	13,011
Fair value adjustments on business combinations						3,870						6,470
Deferred compensation						235						228
Postretirement benefits other than pension liability						684						666
Accrued stock-based compensation						1,654						1,296
OREO write-downs						8						162
Interest on nonaccrual loans						1,712						548
Accrued expenses						5,647						4,708
State net operating loss						1,959						2,792
Leasing liability						16,947						14,806
Reserve for unfunded commitments						2,854						133
Deferred loan fees and costs						1,691						0
Other						577						683
Total deferred tax assets						77,509						45,503
Deferred tax liabilities
Tax depreciation in excess of book depreciation						(11,923)						(10,970)
FHLB and FRB stock						(4,043)						(4,043)
Mortgage-servicing rights						(2,925)						(2,435)
Leasing activities						(6,661)						(7,349)
Retirement obligation						(10,984)						(8,511)
Intangible assets						(13,942)						(11,647)
Deferred loan fees and costs						0						(1,100)
Prepaid expenses						(619)						(623)
Limited partnership investments						(2,471)						(2,249)
Net unrealized gains on investment securities						(20,253)						(11,359)
Foreign exchange deferred income						(2,080)						(2,845)
ASU 2016-01 unrealized gain/loss-equity securities						(2,179)						(128)
Right of use assets						(15,053)						(13,354)
Other						(2,035)						(1,920)
Total deferred tax liabilities						(95,168)						(78,533)
Total net deferred tax liability						$	(17,659)					$	(33,030)

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, 2020 and 2019 is as follows:

(Dollars in thousands)						2020						2019
Balance at beginning of year						$	3,006					$	3,735
Settlements						(620)						(729)
Balance at end of year						$	2,386					$	3,006

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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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