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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 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 | $ 7,146 | $ 8,052 | $ 6,702 | $ 9,585 | $ 8,891 | $ 9,081 | $ 8,749 | $ 8,278 |  | $ 31,485 | $ 34,999 | $ 45,385
Reconciliation of federal and state income taxes at statutory rates to the income taxes included in the statements of operations |  |  |  |  |  |  |  |  |  |  |  |
Income tax at statutory rate (as a percent) |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
TCJA (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 7.50%
Tax-exempt interest, net (as a percent) |  |  |  |  |  |  |  |  |  | (1.70%) | (1.30%) | (2.10%)
Stock incentive (as a percent) |  |  |  |  |  |  |  |  |  | (0.10%) | (0.30%) | (0.50%)
State income taxes, net (as a percent) |  |  |  |  |  |  |  |  |  | 5.50% | 7.30% | 4.00%
Income on bank owned life insurance (as a percent) |  |  |  |  |  |  |  |  |  | (0.90%) | (0.60%) | (0.90%)
Tax credit investments |  |  |  |  |  |  |  |  |  | (1.30%) |  |
Other, net (as a percent) |  |  |  |  |  |  |  |  |  | 0.90% |  | (1.00%)
Total (as a percent) |  |  |  |  |  |  |  |  |  | 23.40% | 26.10% | 42.00%
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses on debt securities available for sale |  |  |  |  | 2,716 |  |  |  |  |  | $ 2,716 |
Allowance for loan losses | 15,416 |  |  |  | 14,885 |  |  |  |  | $ 15,416 | 14,885 |
Stock-based compensation | 2,069 |  |  |  | 2,208 |  |  |  |  | 2,069 | 2,208 |
Deferred compensation | 166 |  |  |  | 1,454 |  |  |  |  | 166 | 1,454 |
Affordable housing partnerships and other investments | 777 |  |  |  | 691 |  |  |  |  | 777 | 691 |
Purchase accounting adjustments | 11,301 |  |  |  | 4,563 |  |  |  |  | 11,301 | 4,563 |
Accrued vacation | 827 |  |  |  | 744 |  |  |  |  | 827 | 744 |
Lease liability | 2,650 |  |  |  |  |  |  |  |  | 2,650 |  |
Employee costs | 1,048 |  |  |  | 260 |  |  |  |  | 1,048 | 260 |
Other | 809 |  |  |  | 1,095 |  |  |  |  | 809 | 1,095 |
Total | 35,063 |  |  |  | 28,616 |  |  |  |  | 35,063 | 28,616 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains on debt securities available for sale | (6,032) |  |  |  |  |  |  |  |  | (6,032) |  |
Basis in premises and equipment | (4,222) |  |  |  | (1,213) |  |  |  |  | (4,222) | (1,213) |
Affordable housing partnerships and other investments | (1,411) |  |  |  | (1,868) |  |  |  |  | (1,411) | (1,868) |
Purchase accounting adjustments | (1,023) |  |  |  | (1,102) |  |  |  |  | (1,023) | (1,102) |
Mortgage servicing assets | (3,717) |  |  |  | (1,159) |  |  |  |  | (3,717) | (1,159) |
Basis in core deposit and customer intangible assets | (17,120) |  |  |  | (9,299) |  |  |  |  | (17,120) | (9,299) |
Deferred loan origination costs | (1,730) |  |  |  | (1,593) |  |  |  |  | (1,730) | (1,593) |
Lease right of use asset | (2,633) |  |  |  |  |  |  |  |  | (2,633) |  |
Unrealized gain on equity securities | (593) |  |  |  | (662) |  |  |  |  | (593) | (662) |
Other | (508) |  |  |  | (322) |  |  |  |  | (508) | (322) |
Deferred tax liabilities | (38,989) |  |  |  | (17,218) |  |  |  |  | (38,989) | (17,218) |
Net operating loss carryforward, net of valuation allowance |  |  |  |  | 33 |  |  |  |  |  | 33 |
Net deferred tax assets | (3,926) |  |  |  |  |  |  |  |  | (3,926) |  |
Net deferred tax (liability) asset |  |  |  |  | 11,431 |  |  |  |  |  | 11,431 |
Non-cash charge due to revaluation of Company's net deferred tax position following the enactment of the TCJA |  |  |  |  |  |  |  |  | $ 8,100 |  |  |
Operating loss carryforwards | 0 |  |  |  |  |  |  |  |  | 0 |  |
Valuation allowance, deferred tax assets | $ 0 |  |  |  | $ 0 |  |  |  |  | $ 0 | $ 0 |

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