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Allowance for Loan and Lease Losses and Credit Quality - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 01, 2019
Receivables [Abstract]        
Commitments to lend additional funds $ 638 $ 638    
Business Acquisition [Line Items]        
Other real estate owned 34,256 17,403    
Repossessed and returned assets 8,045 14,574    
Other real estate owned and repossessed and returned assets, write down $ 7,700 $ 3,400 $ 6,200  
Chemical Financial Corporation        
Business Acquisition [Line Items]        
Other real estate owned       $ 14,600
Repossessed and returned assets       $ 338