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Borrowings - Narrative (Details)
12 Months Ended
Jul. 11, 2016
USD ($)
Dec. 31, 2020
USD ($)
trustSubsidiary
Oct. 28, 2020
USD ($)
Dec. 31, 2019
Federal Home Loan Bank, Advances        
Number of trust subsidiaries | trustSubsidiary   9    
Payment of interest on trust preferred securities   $ 0    
Senior notes maturing in 2021        
Federal Home Loan Bank, Advances        
Senior notes interest rate   6.125%   6.125%
Notes, matures 2030        
Federal Home Loan Bank, Advances        
Senior notes interest rate   4.125%   0.00%
Senior notes | Senior notes maturing in 2021        
Federal Home Loan Bank, Advances        
Debt instrument face amount $ 250,000,000      
Redemption price percentage 100.00%      
Senior notes | Senior notes maturing in 2021 | Treasury rate        
Federal Home Loan Bank, Advances        
Variable rate on spread 0.50%      
Subordinated notes | Notes, matures 2030        
Federal Home Loan Bank, Advances        
Debt instrument face amount     $ 150,000,000  
Senior notes interest rate     4.125%