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Business Combinations (Additional Information) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 02, 2020
Jan. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]        
Acquisition and due diligence fees     $ 1,471 $ 0
Ann Arbor Bancorp, Inc        
Business Acquisition [Line Items]        
Total cash consideration $ 67,900      
Goodwill acquired $ 26,800 $ 26,800