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Borrowings - Narrative (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Short term borrowings $ 0 $ 0
Repurchased agreements, borrowing capacity 5,000,000 5,000,000
Repurchases agreements, outstanding balance 0 0
Short term borrowings 1,441,000 0
Federal Home Loan Bank of Atlanta    
Debt Instrument [Line Items]    
FHLB maximum amount available 849,100,000  
Federal Funds Purchased    
Debt Instrument [Line Items]    
Line of credit, maximum borrowing capacity 72,500,000 47,500,000
Federal Reserve Bank Advances | Federal Reserve Bank    
Debt Instrument [Line Items]    
Collateral amount 395,200,000 348,500,000
Remaining available credit facility 218,000,000 189,100,000
Short term borrowings $ 0 $ 0