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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense | Income tax expense consists of the following:
Year ended December 31, | 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 39.4 |  |  | $ | 42.4 |  |  | $ | 40.5 |
State | 11.3 |  |  | 12.3 |  |  | 8.2 |
Total current | 50.7 |  |  | 54.7 |  |  | 48.7 |
Deferred: |  |  |  |  |
Federal | 3.7 |  |  | (5.7) |  |  | 3.7 |
State | 1.3 |  |  | (0.9) |  |  | 1.7 |
Total deferred | 5.0 |  |  | (6.6) |  |  | 5.4 |
Total income tax expense | $ | 55.7 |  |  | $ | 48.1 |  |  | $ | 54.1 |
Schedule of Effective Income Tax Rate Reconciliation | Total income tax provision differs from the amount of income tax determined by applying the statutory federal income tax rate of 21% for the periods presented to income before income taxes due to the following:
Year ended December 31, | 2021 |  | 2020 |  | 2019
Tax expense at the statutory tax rate | $ | 52.0 |  |  | $ | 44.0 |  |  | $ | 49.4 |
Increase (decrease) in tax resulting from: |  |  |  |  |
Tax-exempt income | (2.8) |  |  | (2.1) |  |  | (2.8) |
State income tax, net of federal income tax benefit | 9.9 |  |  | 9.0 |  |  | 9.9 |
Benefit of stock-based compensation plans | (0.5) |  |  | (0.4) |  |  | (1.2) |
Nondeductible transaction costs | 0.8 |  |  | — |  |  | 0.2 |
Federal tax credits | (4.3) |  |  | (2.3) |  |  | (2.0) |
Other, net | 0.6 |  |  | (0.1) |  |  | 0.6 |
Tax expense at effective tax rate | $ | 55.7 |  |  | $ | 48.1 |  |  | $ | 54.1 |
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences between the financial statement carrying amounts and tax bases of assets and liabilities that give rise to significant portions of the net deferred tax asset (liability) relate to the following:
December 31, | 2021 |  | 2020
Deferred tax assets: |  |  |
Loans, principally due to allowance for credit losses | $ | 30.7 |  |  | $ | 36.5 |
Loan discount | 1.6 |  |  | 4.0 |
Investment securities, unrealized losses | 4.6 |  |  | — |
Deferred compensation | 19.3 |  |  | 19.5 |
Non-performing loan interest | 1.0 |  |  | 1.2 |
Net operating loss carryforwards (1) | 1.7 |  |  | 2.0 |
Lease liabilities | 8.7 |  |  | 9.5 |
Other | 3.5 |  |  | 3.2 |
Deferred tax assets | 71.1 |  |  | 75.9 |
December 31, | 2021 |  | 2020
Deferred tax liabilities: |  |  |
Fixed assets, principally differences in bases and depreciation | (7.7) |  |  | (10.9) |
Deferred loan costs | (1.9) |  |  | (4.4) |
Investment securities, unrealized gains | — |  |  | (19.2) |
Derivatives, unrealized gains | (1.0) |  |  | — |
Investment in joint venture partnership, principally due to differences in depreciation of partnership assets | (0.9) |  |  | (0.9) |
Right of use assets | (8.3) |  |  | (9.2) |
Prepaid amounts | (0.7) |  |  | (0.5) |
Government agency stock dividends | (1.2) |  |  | (1.2) |
Goodwill and core deposit intangibles | (51.2) |  |  | (50.3) |
Mortgage servicing rights | (6.8) |  |  | (5.6) |
Other | (0.7) |  |  | (0.9) |
Deferred tax liabilities | (80.4) |  |  | (103.1) |
Net deferred tax assets (liabilities) | $ | (9.3) |  |  | $ | (27.2) |
(1) As of December 31, 2021, we had remaining federal net operating loss carryforwards of $3.1 million from acquired companies, which is available to offset federal taxable income and state net operating loss carryforwards in amounts which vary by state. The federal net operating losses will expire beginning in 2030 and ending in 2036 and the state net operating losses will expire beginning in 2023 and ending in 2034. The use of these carryforwards is subject to annual limitations.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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