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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
Tax provision computed at federal statutory rate                 $ 13,965,000 $ 21,384,000 $ 11,728,000
Tax reform impact [1]                   2,984,000  
State taxes, net                 1,716,000 1,112,000 852,000
Transaction costs                     325,000
Bank-owned life insurance                 (141,000) (246,000) (201,000)
Tax exempt interest                 (436,000) (545,000) (129,000)
Change in valuation allowance for deferred tax asset                 (7,000) (10,000) (54,000)
Other                 (305,000) 199,000 288,000
Income tax expense $ 4,718,000 $ 2,922,000 $ 3,508,000 $ 3,644,000 $ 8,327,000 $ 5,104,000 $ 5,331,000 $ 6,116,000 $ 14,792,000 $ 24,878,000 $ 12,809,000
[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%.