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Employee Benefit Plans - Salary Continuation Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Obligation, at the beginning of the year $ 4,334 $ 4,600 $ 0
Balance acquired in Premier Merger 4,334 4,600 4,600
Benefits paid (460) (554) (529)
Expenses incurred 288 288 411
Obligation, at the end of the year 4,162 4,334 4,600
Accrued Expenses and Other Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Obligation, at the beginning of the year 0 4,718  
Balance acquired in Premier Merger 0 4,718 4,718
Obligation, at the end of the year $ 0 $ 0 $ 4,718