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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2022
Income Tax Disclosure [Abstract]  
Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate
Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statement of income:
Years Ended December 31,
(dollars in thousands)202220212020
Provision at statutory rate of 21%
$114,394 $71,161 $53,667 
Tax-exempt income:
Tax-exempt interest(14,588)(11,066)(10,776)
Section 291/265 interest disallowance363 114 189 
Company-owned life insurance income(2,891)(2,138)(2,290)
Tax-exempt income(17,116)(13,090)(12,877)
State income taxes20,837 9,308 4,840 
Tax credit investments - federal(9,140)(5,212)(15,159)
Officer compensation limitation5,903 564 598 
Other, net1,568 (1,407)(1,922)
Income tax expense$116,446 $61,324 $29,147 
Effective tax rate21.4 %18.1 %11.4 %
Provision for Income Taxes
The provision for income taxes consisted of the following components:
Years Ended December 31,
(dollars in thousands)202220212020
Current expense:
Federal$106,918 $31,943 $19,223 
State32,898 8,461 6,498 
Deferred expense:
Federal(16,216)17,514 3,188 
State(7,154)3,406 238 
Deferred income tax expense(23,370)20,920 3,426 
Income tax expense$116,446 $61,324 $29,147 
Schedule of Significant Components of Net Deferred Tax Assets (Liabilities) Significant components of net deferred tax assets (liabilities) were as follows:
December 31,
(dollars in thousands)20222021
Deferred Tax Assets  
Allowance for credit losses on loans, net of recapture$85,619 $28,843 
Benefit plan accruals38,038 18,348 
Net operating loss carryforwards25,135 14,823 
Acquired loans40,723 8,039 
Operating lease liabilities58,288 22,961 
Unrealized losses on available-for-sale investment securities202,101 3,003 
Unrealized losses on held-to-maturity investment securities36,197 — 
Unrealized losses on hedges10,277 — 
Purchase accounting20,063 — 
Other, net4,962 3,430 
Total deferred tax assets521,403 99,447 
Deferred Tax Liabilities
Deferred loan origination fees(3,566)— 
Purchase accounting (18,524)
Loan servicing rights(9,636)(7,379)
Premises and equipment(14,844)(16,972)
Prepaid expenses(2,774)(796)
Operating lease right-of-use assets(51,845)(21,129)
Unrealized gains on hedges (177)
Other, net(2,983)(1,564)
Total deferred tax liabilities(85,648)(66,541)
Net deferred tax assets$435,755 $32,906 
Schedule of Unrecognized Tax Benefits The following table presents the changes in the carrying amount of unrecognized tax benefits:
Years Ended December 31,
(dollars in thousands)202220212020
Balance at beginning of period$ $— $— 
Additions for acquired uncertain tax positions14,897 — — 
Reductions for tax positions relating to prior years(2,751)— — 
Reductions due to statute of limitations expiring(1,139)— — 
Balance at end of period$11,007 $— $—