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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Tax provision computed at federal statutory rate |  |  |  |  |  |  |  |  |  | $ 21,384,000 | $ 11,728,000 | $ 13,144,000
Tax reform impact | [1] |  |  |  |  |  |  |  |  | 2,984,000 |  |
State taxes, net |  |  |  |  |  |  |  |  |  | 1,112,000 | 852,000 | 1,444,000
Change in effective tax rate |  |  |  |  |  |  |  |  |  |  |  | (142,000)
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  |  | (5,291,000)
Transaction costs |  |  |  |  |  |  |  |  |  |  | 325,000 |
Bank-owned life insurance |  |  |  |  |  |  |  |  |  | (246,000) | (201,000) | (158,000)
Tax exempt interest |  |  |  |  |  |  |  |  |  | (545,000) | (129,000) | (119,000)
Change in valuation allowance for deferred tax asset |  |  |  |  |  |  |  |  |  | (10,000) | (54,000) | (946,000)
Other |  |  |  |  |  |  |  |  |  | 199,000 | 288,000 | 489,000
Income tax expense |  | $ 8,327,000 | $ 5,104,000 | $ 5,331,000 | $ 6,116,000 | $ 4,134,000 | $ 3,099,000 | $ 2,679,000 | $ 2,897,000 | $ 24,878,000 | $ 12,809,000 | $ 8,421,000
[1] | On December 22, 2017, the United States enacted tax reform legislation commonly known as the Tax Cuts and Jobs Act (the “Tax Act”), resulting in significant modifications to existing law. As a result of the changes under the Tax Act, the Company recorded incremental income tax expense of $2,984,000 during the year ended December 31, 2017, which consisted primarily of the remeasurement of deferred tax assets and liabilities at the new federal statutory rate of 21%. Prior to the enactment of the Tax Act, deferred tax assets and liabilities were measured at the previous federal statutory rate of 35%. Authoritative guidance and interpretation by regulatory bodies is ongoing, and as such, the accounting for the effects of the Tax Act is not final and the full impact of the new regulation is still being evaluated.

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to the impact of tax reform legislation. + References No definition available. + Details
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