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Income Taxes | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Income Taxes | Note 12. Income Taxes ​ The components of income taxes consist of (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2019 |  | 2018 |  | 2017
Current expense: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | $ | 22,479 | ​ | $ | 18,076 | ​ | $ | 27,168
State | ​ | ​ | 8,910 | ​ | ​ | 9,807 | ​ | ​ | 4,117
Deferred expense: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Federal | ​ | ​ | (380) | ​ | ​ | 5,068 | ​ | ​ | 11,583
State | ​ | ​ | 476 | ​ | ​ | 2,048 | ​ | ​ | 2,517
Total income tax expense | ​ | $ | 31,485 | ​ | $ | 34,999 | ​ | $ | 45,385
​ A reconciliation of federal and state income taxes at statutory rates to the income taxes included in the accompanying Consolidated Statements of Income is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, |
​ |  | 2019 |  | 2018 |  | 2017 |
​ | ​ | % of | ​ | % of | ​ | % of |
​ | ​ | Pretax | ​ | Pretax | ​ | Pretax |
​ |  | Income |  | Income |  | Income |
Income tax at federal statutory rate |  | 21.0 | % | 21.0 | % | 35.0 | %
Effect of: | ​ | ​ | ​ | ​ | ​ | ​ | ​
TCJA | ​ | — | % | — | % | 7.5 | %
Tax-exempt interest, net |  | (1.7) | % | (1.3) | % | (2.1) | %
Stock incentive | ​ | (0.1) | % | (0.3) | % | (0.5) | %
State income taxes, net |  | 5.5 | % | 7.3 | % | 4.0 | %
Income on bank owned life insurance |  | (0.9) | % | (0.6) | % | (0.9) | %
Tax credit investments | ​ | (1.3) | % | — | % | — | %
Other, net |  | 0.9 | % | — | % | (1.0) | %
​ |  | 23.4 | % | 26.1 | % | 42.0 | %
​ On December 22, 2017, TCJA was signed into law and became effective January 2018. The TCJA reduced the corporate tax rate as well as adjusted tax rates, deductions and exemptions for individuals and businesses alike. The Company took a non-recurring, non-cash charge of $8.1 million in the fourth quarter of 2017 as a result of the revaluation of the Company’s net deferred tax position following the enactment of the TCJA. ​ Net deferred taxes at December 31, 2019 and 2018 in the accompanying Consolidated Balance Sheets, include the following amounts of deferred tax assets and liabilities (dollars in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​
Unrealized losses on debt securities available for sale | ​ | $ | — | ​ | $ | 2,716
Allowance for loan losses | ​ | ​ | 15,416 | ​ | ​ | 14,885
Stock-based compensation | ​ |  | 2,069 | ​ |  | 2,208
Deferred compensation | ​ |  | 166 | ​ |  | 1,454
Affordable housing partnerships and other investments | ​ |  | 777 | ​ |  | 691
Purchase accounting adjustments | ​ | ​ | 11,301 | ​ | ​ | 4,563
Accrued vacation | ​ |  | 827 | ​ |  | 744
Lease liability | ​ | ​ | 2,650 | ​ | ​ | —
Employee costs | ​ |  | 1,048 | ​ |  | 260
Other | ​ |  | 809 | ​ |  | 1,095
​ | ​ | $ | 35,063 | ​ | $ | 28,616
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​
Unrealized gains on debt securities available for sale | ​ | ​ | (6,032) | ​ | ​ | —
Basis in premises and equipment | ​ |  | (4,222) | ​ |  | (1,213)
Affordable housing partnerships and other investments | ​ | ​ | (1,411) | ​ | ​ | (1,868)
Purchase accounting adjustments | ​ | ​ | (1,023) | ​ | ​ | (1,102)
Mortgage servicing assets | ​ |  | (3,717) | ​ |  | (1,159)
Basis in core deposit and customer intangible assets | ​ |  | (17,120) | ​ |  | (9,299)
Deferred loan origination costs | ​ |  | (1,730) | ​ |  | (1,593)
Lease right of use asset | ​ | ​ | (2,633) | ​ | ​ | —
Unrealized gain on equity securities | ​ | ​ | (593) | ​ | ​ | (662)
Other | ​ |  | (508) | ​ |  | (322)
​ | ​ | $ | (38,989) | ​ | $ | (17,218)
Net operating loss carryforward, net of valuation allowance | ​ |  | — | ​ |  | 33
Net deferred tax (liability) asset | ​ | $ | (3,926) | ​ | $ | 11,431
​ At December 31, 2019, the Company had no net operating loss carryforward remaining. ​ Management believes that it is more likely than not that the other deferred tax assets included in the accompanying Consolidated Balance Sheets will be fully realized. The Company has determined that no valuation allowance is required for any deferred tax assets as of December 31, 2019 and 2018.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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