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Business and Summary of Significant Accounting Policies - Other intangible assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Minimum      
Finite Lived Intangible Assets [Line Items]      
Intangibles amortization period (in years) 9 years    
Maximum      
Finite Lived Intangible Assets [Line Items]      
Intangibles amortization period (in years) 10 years    
Core Deposits      
Finite Lived Intangible Assets [Line Items]      
Impairment on intangible assets $ 0 $ 0 $ 0