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Other Borrowings - Junior Subordinated Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Junior Subordinated Debt    
Junior subordinated debt securities $ 115.8 $ 115.2
Discount $ 2.7 $ 3.4
Junior Subordinated Debt    
Junior Subordinated Debt    
Debt instrument term 5 years  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.60% 4.45%
Long-term Debt, Weighted Average Interest Rate, over Time 4.20% 3.90%
Junior Subordinated Debt net of discount    
Junior Subordinated Debt    
Long-term Debt, Weighted Average Interest Rate, over Time 4.88% 4.61%
Trusts | Junior Subordinated Debt    
Junior Subordinated Debt    
Junior subordinated debt securities $ 115.8  
Amount of trust preferred securities excluded from Tier 1 capital $ 115.8  
Maximum allowed percentage of ownership interest to total Tier 1 capital 25.00%  
SAVB Capital Trust I and II and FFCH Capital Trust I | Junior Subordinated Debt    
Junior Subordinated Debt    
Liability for the junior subordinated debt securities recorded on SAVB Capital Trust I and II $ 115.8  
Discount 2.7  
Amount paid to holders, if the entity call backs the subordinated debt securities $ 118.6  
Discount amortization period 5 years