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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of income tax expense
The following table shows the composition of income tax expense.
Year Ended December 31 (Dollars in thousands) 
202120202019
Current:   
Federal$16,346 $42,411 $28,130 
State4,586 6,629 5,739 
Total current20,932 49,040 33,869 
Deferred:   
Federal14,206 (21,865)(5,135)
State1,190 (2,295)(595)
Total deferred15,396 (24,160)(5,730)
Total provision$36,328 $24,880 $28,139 
Schedule of reasons for the difference between income tax expense and the amount computed by applying the statutory federal income tax rate
The following table shows the reasons for the difference between income tax expense and the amount computed by applying the statutory federal income tax rate (21%) to income before income taxes.
 202120202019
Year Ended December 31 (Dollars in thousands)
AmountPercent of Pretax IncomeAmountPercent of Pretax IncomeAmountPercent of Pretax Income
Statutory federal income tax$32,526 21.0 %$22,332 21.0 %$25,232 21.0 %
(Decrease) increase in income taxes resulting from:      
Tax-exempt interest income(373)(0.2)(439)(0.4)(552)(0.5)
State taxes, net of federal income tax benefit4,563 2.9 3,424 3.2 4,064 3.4 
Other(388)(0.2)(437)(0.4)(605)(0.5)
Total$36,328 23.5 %$24,880 23.4 %$28,139 23.4 %
Schedule of deferred tax assets and liabilities
The following table shows the composition of deferred tax assets and liabilities as of December 31, 2021 and 2020.
(Dollars in thousands) 20212020
Deferred tax assets:  
Allowance for credit losses$32,431 $35,696 
Tax credit carryforward 8,606 
Operating lease liability5,145 5,704 
Accruals for employee benefits3,837 2,963 
Capitalized loan costs15 893 
Net unrealized losses on securities available-for-sale3,128 — 
Other1,015 851 
Total deferred tax assets45,571 54,713 
Deferred tax liabilities:  
Differing depreciable bases in premises and leased equipment10,796 13,118 
Right of use assets - leases5,315 5,737 
Differing bases in assets related to acquisitions4,219 4,160 
Tax advantaged partnerships9,502 3,770 
Net unrealized gains on securities available-for-sale 5,827 
Other713 634 
Total deferred tax liabilities30,545 33,246 
Net deferred tax asset$15,026 $21,467