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Goodwill and Intangible Assets (Additional Information) (Details)
1 Months Ended 3 Months Ended 59 Months Ended
Jan. 02, 2020
USD ($)
Jan. 31, 2020
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jan. 31, 2020
acquisition
Dec. 31, 2019
USD ($)
Goodwill [Line Items]                
Number of banks acquired | acquisition             3  
Goodwill recognized in the acquisition         $ 36,216,000     $ 9,387,000
Goodwill impairment         0      
Amortization of core deposit intangibles         192,000 $ 52,000    
Serviced mortgage loans, unpaid principal balance         21,900,000     $ 9,000,000
Lotus Bank                
Goodwill [Line Items]                
Goodwill acquired       $ 4,600,000        
Bank of Michigan                
Goodwill [Line Items]                
Goodwill acquired     $ 4,800,000          
Ann Arbor Bancorp, Inc                
Goodwill [Line Items]                
Goodwill acquired $ 26,800,000 $ 26,800,000            
Goodwill recognized in the acquisition $ 26,829,000              
Core Deposits                
Goodwill [Line Items]                
Amortization of core deposit intangibles         $ 192,000 $ 52,000