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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.