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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
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)202120202019
Provision at statutory rate of 21%
$71,161 $53,667 $60,975 
Tax-exempt income:
Tax-exempt interest(11,066)(10,776)(10,243)
Section 291/265 interest disallowance114 189 435 
Company-owned life insurance income(2,138)(2,290)(2,423)
Tax-exempt income(13,090)(12,877)(12,231)
State income taxes9,308 4,840 6,720 
Tax credit investments - federal(5,212)(15,159)(4,411)
Other, net(843)(1,324)1,097 
Income tax expense$61,324 $29,147 $52,150 
Effective tax rate18.1 %11.4 %18.0 %
Provision for Income Taxes
The provision for income taxes consisted of the following components:
Years Ended December 31,
(dollars in thousands)202120202019
Current expense:
Federal$31,943 $19,223 $22,908 
State8,461 6,498 4,490 
Deferred expense:
Federal17,514 3,188 20,402 
State3,406 238 4,350 
Deferred income tax expense20,920 3,426 24,752 
Income tax expense$61,324 $29,147 $52,150 
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)20212020
Deferred Tax Assets  
Allowance for credit losses, net of recapture$28,843 $34,971 
Benefit plan accruals18,348 20,076 
Net operating loss carryforwards14,823 18,982 
Deferred gain on securities1,215 2,102 
Acquired loans8,039 11,989 
Operating lease liabilities22,961 24,245 
Unrealized losses on available-for-sale investment securities3,003 — 
Tax credit investments and other partnerships301 1,054 
Other, net1,914 488 
Total deferred tax assets99,447 113,907 
Deferred Tax Liabilities
Purchase accounting(18,524)(18,232)
Loan servicing rights(7,379)(6,582)
Premises and equipment(16,972)(14,008)
Prepaid expenses(796)(955)
Operating lease right-of-use assets(21,129)(21,569)
Unrealized gains on available-for-sale investment securities (40,756)
Unrealized gains on hedges(177)(1,080)
Other, net(1,564)(1,555)
Total deferred tax liabilities(66,541)(104,737)
Net deferred tax assets$32,906 $9,170