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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes |
Schedule of the components of 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
Schedule of the reconciliation of federal and state income taxes at statutory rates to the income taxes included in the statements of income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | %
Schedule of the deferred tax assets and liabilities | 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

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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=84230637&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=84230637&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=84230637&loc=d3e32687-109319 + Details
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