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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2022
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)202220212020
Current expense
Federal$24,307 $21,397 $34,632 
State3,308 2,289 2,349 
Total current expense27,615 23,686 36,981 
Deferred expense (benefit)
Federal(4,399)10,944 (8,624)
State894 1,143 244 
Total deferred expense (benefit)(3,505)12,087 (8,380)
Income tax expense$24,110 $35,773 $28,601 
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)202220212020
Income taxes computed at federal statutory rate (21%) on income before income taxes
$50,762 $50,596 $38,726 
Benefit from tax-exempt income(5,743)(5,613)(5,901)
Tax credits(37,331)(21,561)(13,064)
Basis reduction on tax credit2,761 1,346 657 
Tax expense (benefit) of equity compensation(154)(243)340 
State income taxes, net of federal tax benefit3,320 2,711 2,049 
Affordable housing investments9,341 7,194 6,635 
Other1,154 1,343 (841)
Income tax expense$24,110 $35,773 $28,601 
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, 2022, and 2021, were as follows:
(Dollars in thousands)20222021
Deferred tax assets
Allowance for credit losses$30,464 $29,754 
Deferred compensation346 292 
Postretirement benefits other than pension liability636 652 
Accrued stock-based compensation2,216 1,836 
Interest on nonaccrual loans406 442 
Accrued expenses7,454 7,286 
Net unrealized losses on investment securities92,072 
State net operating loss1,152 1,746 
Leasing liability15,308 15,794 
Reserve for unfunded commitments4,254 3,049 
Other516 565 
Total deferred tax assets154,824 61,416 
Deferred tax liabilities
Tax depreciation in excess of book depreciation(7,172)(9,117)
FHLB and FRB stock(3,912)(3,836)
Mortgage-servicing rights(3,825)(3,518)
Leasing activities(12,829)(10,860)
Retirement obligation(10,197)(13,754)
Intangible assets(18,462)(16,081)
Deferred loan fees and costs(1,638)(933)
Prepaid expenses(645)(680)
Limited partnership investments(312)(2,957)
Fair value adjustments on business combinations(6,736)(6,900)
Net unrealized gains on investment securities(5,791)
Foreign exchange deferred income(428)
ASU 2016-01 unrealized gain/loss-equity securities(2,237)(2,339)
Right of use assets(12,911)(13,390)
Other(3,653)(2,426)
Total deferred tax liabilities(84,529)(93,010)
Total net deferred tax asset (liability)$70,295 $(31,594)
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, 2022, 2021 and 2020 is as follows:
(Dollars in thousands)202220212020
Balance at beginning of year$2,386 $2,386 $3,006 
Settlements(620)
Balance at end of year$2,386 $2,386 $2,386