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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Provision (Benefit) | The income tax provision for the years ended December 31 is as follows:
| 2020 |  | 2019 |  | 2018
| (dollars in thousands)
Current tax provision: |  |  |  |  |
Federal | $ | 21,629 |  |  | $ | 22,942 |  |  | $ | 21,330 |
State | 329 |  |  | 282 |  |  | 298 |
Total current tax provision | 21,958 |  |  | 23,224 |  |  | 21,628 |
Deferred tax provision (benefit): |  |  |  |  |
Federal | (5,070) |  |  | 2,284 |  |  | 3,666 |
State | (132) |  |  | 8 |  |  | (20) |
Total deferred tax provision | (5,202) |  |  | 2,292 |  |  | 3,646 |
Total tax provision | $ | 16,756 |  |  | $ | 25,516 |  |  | $ | 25,274 |
Schedule of Effective Income Tax Rate Reconciliation | The statutory to effective tax rate reconciliation for the years ended December 31 is as follows:
| 2020 |  | 2019 |  | 2018
| Amount |  | % of Pretax Income |  | Amount |  | % of Pretax Income |  | Amount |  | % of Pretax Income
| (dollars in thousands)
Tax at statutory rate | $ | 18,943 |  |  | 21 | % |  | $ | 27,478 |  |  | 21 | % |  | $ | 27,882 |  |  | 21 | %
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State income tax, net of federal benefit | 155 |  |  | — |  |  | 229 |  |  | — |  |  | 220 |  |  | — |
Income from bank owned life insurance | (1,376) |  |  | (1) |  |  | (1,260) |  |  | (1) |  |  | (1,404) |  |  | (1) |
Tax-exempt interest income, net | (1,117) |  |  | (1) |  |  | (1,298) |  |  | (1) |  |  | (1,473) |  |  | (1) |
Tax credits | (44) |  |  | — |  |  | (7) |  |  | — |  |  | (5) |  |  | — |
Enactment of federal tax reform | — |  |  | — |  |  | — |  |  | — |  |  | (346) |  |  | — |
Other | 195 |  |  | — |  |  | 374 |  |  | — |  |  | 400 |  |  | — |
Total tax provision | $ | 16,756 |  |  | 19 | % |  | $ | 25,516 |  |  | 19 | % |  | $ | 25,274 |  |  | 19 | %
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences between the financial statement carrying amounts and the tax bases of assets and liabilities that represent significant portions of the deferred tax assets and liabilities at December 31 are presented below:
| 2020 |  | 2019
| (dollars in thousands)
Deferred tax assets: |  |  |
Lease liability | $ | 9,928 |  |  | $ | 11,203 |
Allowance for credit losses | 21,483 |  |  | 10,937 |
Postretirement benefits other than pensions | 242 |  |  | 275 |
Alternative minimum tax credit carryforward | — |  |  | 216 |
Net operating loss carryforward | 385 |  |  | 2,017 |
Deferred compensation | 1,723 |  |  | 1,720 |
Accrued interest on nonaccrual loans | 644 |  |  | 710 |
Accrued incentives | 2,182 |  |  | 2,185 |
Unfunded loan commitments & other reserves | 1,576 |  |  | 964 |
Other | 1,831 |  |  | 1,032 |
Total deferred tax assets | 39,994 |  |  | 31,259 |
Deferred tax liabilities: |  |  |
Loan origination fees and costs | (1,280) |  |  | (626) |
Right of use asset | $ | (9,037) |  |  | $ | (10,302) |
Unrealized gain on securities available for sale | (4,629) |  |  | (1,386) |
Depreciation of assets | (2,103) |  |  | (1,470) |
Section 197 intangibles | (540) |  |  | (45) |
Other | (424) |  |  | (568) |
Total deferred tax liabilities | (18,013) |  |  | (14,397) |
Net deferred tax asset | $ | 21,981 |  |  | $ | 16,862 |

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