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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2024
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)202420232022
Current expense
Federal$15,133 $46,800 $24,307 
State3,159 2,568 3,308 
Total current expense18,292 49,368 27,615 
Deferred expense (benefit)
Federal21,014 11,769 (4,399)
State188 1,596 894 
Total deferred expense (benefit)21,202 13,365 (3,505)
Income tax expense$39,494 $62,733 $24,110 
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)202420232022
Income taxes computed at federal statutory rate (21%) on income before income taxes
$56,348 $66,905 $50,762 
Benefit from tax-exempt income(4,892)(6,165)(5,743)
Tax credits(29,188)(15,271)(37,331)
Basis reduction on tax credit1,630 87 2,761 
Tax expense (benefit) of equity compensation(289)(418)(154)
State income taxes, net of federal tax benefit1,676 3,290 3,320 
Affordable housing investments12,453 12,097 9,341 
Other1,756 2,208 1,154 
Income tax expense$39,494 $62,733 $24,110 
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, 2024, and 2023, were as follows:
(Dollars in thousands)20242023
Deferred tax assets
Allowance for credit losses$35,984 $32,453 
Deferred compensation430 326 
Postretirement benefits other than pension liability502 537 
Accrued stock-based compensation2,701 2,317 
Interest on nonaccrual loans398 336 
Accrued expenses7,978 7,822 
Net unrealized losses on investment securities72,464 79,652 
Net unrealized losses on derivatives354 
State net operating loss1,462 960 
Leasing liability14,185 15,290 
Reserve for unfunded commitments3,902 4,261 
Section 174 capitalized expense1,373 656 
Other283 13,400 
Total deferred tax assets142,016 158,010 
Deferred tax liabilities
Tax depreciation in excess of book depreciation(5,652)(7,568)
FHLB and FRB stock(3,910)(3,911)
Mortgage-servicing rights(4,262)(3,956)
Leasing activities(42,654)(36,940)
Retirement obligation(10,608)(9,811)
Intangible assets(23,138)(20,789)
Deferred loan fees and costs(3,406)(2,408)
Prepaid expenses(408)(353)
Limited partnership investments(9,394)(3,062)
Fair value adjustments on business combinations(5,716)(5,788)
Net unrealized gains on derivatives(1,130)
ASU 2016-01 unrealized gain/loss-equity securities(207)(2,401)
Right of use assets(11,839)(12,868)
Other(4,811)(3,918)
Total deferred tax liabilities(126,005)(114,903)
Total net deferred tax asset (liability)$16,011 $43,107 
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
A progression of gross unrecognized tax benefits as of December 31, 2024, 2023 and 2022 is as follows:
(Dollars in thousands)202420232022
Balance at beginning of year$$2,386 $2,386 
Reductions for tax positions of prior years(1,909)
Settlements(477)
Balance at end of year$$$2,386