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Other Borrowings - Junior Subordinated Debt - (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Junior Subordinated Debt    
Junior subordinated debt securities   $ 54,400,000
Discount   $ 213,000
Junior Subordinated Debt    
Junior Subordinated Debt    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.26% 2.82%
Long-term Debt, Weighted Average Interest Rate, over Time 2.99% 2.59%
Junior Subordinated Debt net of discount    
Junior Subordinated Debt    
Long-term Debt, Weighted Average Interest Rate, over Time 3.94% 2.99%
Trusts | Junior Subordinated Debt    
Junior Subordinated Debt    
Junior subordinated debt securities $ 114,500,000  
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 $ 114,500,000  
Discount 4,100,000  
Amount paid to holders, if the entity call backs the subordinated debt securities $ 118,600,000  
Discount amortization period 5 years