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Income Taxes (Details 2) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reasons for the difference between income tax expense and statutory federal income tax |  |  |  |  |
Statutory federal income tax |  | $ 22,332,000 | $ 25,232,000 | $ 22,056,000 |
Tax-exempt interest income |  | (439,000) | (552,000) | (650,000) |
State taxes, net of federal income tax benefit |  | 3,424,000 | 4,064,000 | 3,315,000 |
Deferred tax liability remeasurement |  | 0 | 0 | (875,000) | $ 2,610,000
Other |  | (437,000) | (605,000) | (1,233,000) |
Total provision |  | $ 24,880,000 | $ 28,139,000 | $ 22,613,000 |
Reasons for the difference between income tax expense rate and statutory federal income tax rate |  |  |  |  |
Statutory federal income tax (as a percent) | 21.00% | 21.00% | 21.00% | 21.00% | 35.00%
Tax-exempt interest income (as a percent) |  | (0.40%) | (0.50%) | (0.60%) |
State taxes, net of federal income tax benefit (as a percent) |  | 3.20% | 3.40% | 3.20% |
Deferred tax liability remeasurement (as a percent) |  | 0.00% | 0.00% | (0.80%) |
Other (as a percent) |  | (0.40%) | (0.50%) | (1.30%) |
Total income tax expense (benefit) (as a percent) |  | 23.40% | 23.40% | 21.50% |
Deferred tax assets: |  |  |  |  |
Reserve for loan and lease losses |  | $ 35,696,000 | $ 28,792,000 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Other |  | 8,606,000 | 0 |  |
Operating lease liability |  | 5,704,000 | 5,899,000 |  |
Accruals for employee benefits |  | 2,963,000 | 2,842,000 |  |
Capitalized loan costs |  | 893,000 | 0 |  |
Mortgage servicing |  | 173,000 | 0 |  |
Other |  | 678,000 | 222,000 |  |
Total deferred tax assets |  | 54,713,000 | 37,755,000 |  |
Deferred tax liabilities: |  |  |  |  |
Differing depreciable bases in premises and leased equipment |  | 13,118,000 | 18,614,000 |  |
Right of use assets - leases |  | 5,737,000 | 5,899,000 |  |
Differing bases in assets related to acquisitions |  | 4,160,000 | 4,092,000 |  |
Tax advantaged partnerships |  | 3,770,000 | 4,383,000 |  |
Net unrealized gains on securities available-for-sale |  | 5,827,000 | 1,640,000 |  |
Mortgage servicing |  | 0 | 394,000 |  |
Capitalized loan costs |  | 0 | 1,207,000 |  |
Prepaid expenses |  | 334,000 | 297,000 |  |
Other |  | 300,000 | 544,000 |  |
Total deferred tax liabilities |  | 33,246,000 | 37,070,000 |  |
Deferred Tax Assets, Net, Total |  | 21,467,000 | 685,000 |  |
Reconciliation of the beginning and ending amounts of unrecognized tax benefits |  |  |  |  |
Balance, at beginning of the period |  | 0 | 0 | $ 1,112,000 |
Additions based on tax positions related to the current year |  | 0 | 0 | 0 |
Additions for tax positions of prior years |  | 0 | 0 | 0 |
Reductions for tax positions of prior years |  | 0 | 0 | 0 |
Reductions due to lapse in statute of limitations |  | 0 | 0 | 0 |
Settlements |  | 0 | 0 | (1,112,000) |
Balance at end of the period |  | 0 | 0 | 0 | $ 1,112,000
Valuation allowance for deferred tax assets |  | 0 | 0 |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized |  | 0 | 0 | 0 |
Interest and penalties net of tax recognized |  | 0.00 | 0.00 | (90,000.00) |
Accrued interest and penalties |  | 0 | 0 | 0 |
Investment securities available-for-sale |  |  |  |  |
Reasons for the difference between income tax expense and statutory federal income tax |  |  |  |  |
Total provision |  | $ 67,000 | $ 0 | $ (83,000) |

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