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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
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) |  | 2020 |  | 2019 |  | 2018
Current: |  |  |  |  |  |
Federal |  | $ | 42,411 |  |  | $ | 28,130 |  |  | $ | 20,167 |
State |  | 6,629 |  |  | 5,739 |  |  | 2,996 |
Total current |  | 49,040 |  |  | 33,869 |  |  | 23,163 |
Deferred: |  |  |  |  |  |
Federal |  | (21,865) |  |  | (5,135) |  |  | (875) |
State |  | (2,295) |  |  | (595) |  |  | 1,200 |
Deferred tax liability remeasurement |  | — |  |  | — |  |  | (875) |
Total deferred |  | (24,160) |  |  | (5,730) |  |  | (550) |
Total provision |  | $ | 24,880 |  |  | $ | 28,139 |  |  | $ | 22,613 |
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.
|  | 2020 |  | 2019 |  | 2018
Year Ended December 31 (Dollars in thousands) |  | Amount |  | Percent of Pretax Income |  | Amount |  | Percent of Pretax Income |  | Amount |  | Percent of Pretax Income
Statutory federal income tax |  | $ | 22,332 |  |  | 21.0 | % |  | $ | 25,232 |  |  | 21.0 | % |  | $ | 22,056 |  |  | 21.0 | %
(Decrease) increase in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt interest income |  | (439) |  |  | (0.4) |  |  | (552) |  |  | (0.5) |  |  | (650) |  |  | (0.6) |
State taxes, net of federal income tax benefit |  | 3,424 |  |  | 3.2 |  |  | 4,064 |  |  | 3.4 |  |  | 3,315 |  |  | 3.2 |
Deferred tax liability remeasurement |  | — |  |  | — |  |  | — |  |  | — |  |  | (875) |  |  | (0.8) |
Other |  | (437) |  |  | (0.4) |  |  | (605) |  |  | (0.5) |  |  | (1,233) |  |  | (1.3) |
Total |  | $ | 24,880 |  |  | 23.4 | % |  | $ | 28,139 |  |  | 23.4 | % |  | $ | 22,613 |  |  | 21.5 | %
Schedule of deferred tax assets and liabilities | The following table shows the composition of deferred tax assets and liabilities as of December 31, 2020 and 2019.
(Dollars in thousands) |  | 2020 |  | 2019
Deferred tax assets: |  |  |  |
Allowance for credit losses |  | $ | 35,696 |  |  | $ | 28,792 |
Tax credit carryforward |  | 8,606 |  |  | — |
Operating lease liability |  | 5,704 |  |  | 5,899 |
Accruals for employee benefits |  | 2,963 |  |  | 2,842 |
Capitalized loan costs |  | 893 |  |  | — |
Mortgage servicing |  | 173 |  |  | — |
Other |  | 678 |  |  | 222 |
Total deferred tax assets |  | 54,713 |  |  | 37,755 |
Deferred tax liabilities: |  |  |  |
Differing depreciable bases in premises and leased equipment |  | 13,118 |  |  | 18,614 |
Right of use assets - leases |  | 5,737 |  |  | 5,899 |
Differing bases in assets related to acquisitions |  | 4,160 |  |  | 4,092 |
Tax advantaged partnerships |  | 3,770 |  |  | 4,383 |
Net unrealized gains on securities available-for-sale |  | 5,827 |  |  | 1,640 |
Mortgage servicing |  | — |  |  | 394 |
Capitalized loan costs |  | — |  |  | 1,207 |
Prepaid expenses |  | 334 |  |  | 297 |
Other |  | 300 |  |  | 544 |
Total deferred tax liabilities |  | 33,246 |  |  | 37,070 |
Net deferred tax asset |  | $ | 21,467 |  |  | $ | 685 |
Schedule of reconciliation of the beginning and ending amounts of unrecognized tax benefits | The following table shows a reconciliation of the beginning and ending amounts of unrecognized tax benefits.
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018
Balance, beginning of year |  | $ | — |  |  | $ | — |  |  | $ | 1,112 |
Additions based on tax positions related to the current year |  | — |  |  | — |  |  | — |
Additions for tax positions of prior years |  | — |  |  | — |  |  | — |
Reductions for tax positions of prior years |  | — |  |  | — |  |  | — |
Reductions due to lapse in statute of limitations |  | — |  |  | — |  |  | — |
Settlements |  | — |  |  | — |  |  | (1,112) |
Balance, end of year |  | $ | — |  |  | $ | — |  |  | $ | — |

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