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Business Combinations (Additional Information) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 02, 2020
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]            
Acquisition and due diligence fees     $ 176 $ 0 $ 1,647 $ 0
Ann Arbor Bancorp, Inc            
Business Acquisition [Line Items]            
Total cash consideration $ 67,900          
Acquisition and due diligence fees         $ 1,600  
Goodwill acquired $ 26,200 $ 26,200