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Borrowing Arrangements - Additional Information (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Line of credit amount outstanding $ 0 $ 0
FRB Secured Line of Credit    
Debt Instrument [Line Items]    
Secured borrowing capacity 15,200,000  
Carrying value of collateral loan pledged 25,200,000  
FHLB Secured Line of Credit    
Debt Instrument [Line Items]    
Secured borrowing capacity 326,900,000  
Carrying value of collateral loan pledged 373,900,000  
Zions Bank | Maximum    
Debt Instrument [Line Items]    
Borrowings of unsecured loan 20,000,000  
Wells Fargo Bank | Letter of Credit    
Debt Instrument [Line Items]    
Borrowings of unsecured loan 2,000,000  
Wells Fargo Bank | Maximum    
Debt Instrument [Line Items]    
Borrowings of unsecured loan 10,000,000  
First Tennessee National Bank | Maximum    
Debt Instrument [Line Items]    
Borrowings of unsecured loan 12,000,000  
Pacific Coast Bankers' Bank | Maximum    
Debt Instrument [Line Items]    
Borrowings of unsecured loan $ 5,000,000