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Mortgage Banking Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mortgage Banking Derivatives      
Amount of loans sold to investors $ 164,700    
Proceeds from sale of loan to investors 168,472 $ 137,622 $ 151,289
Gain on sale of loan 5,112 3,791 $ 4,803
Federal National Mortgage Association [Member]      
Mortgage Banking Derivatives      
Amount of loans sold to investors $ 122,400    
Federal National Mortgage Association [Member] | Customer Concentration Risk [Member]      
Mortgage Banking Derivatives      
Percentage of concentration risk 74.40%    
Federal Home Loan Mortgage Corporation [Member]      
Mortgage Banking Derivatives      
Amount of loans sold to investors $ 18,700    
Federal Home Loan Mortgage Corporation [Member] | Customer Concentration Risk [Member]      
Mortgage Banking Derivatives      
Percentage of concentration risk 11.40%    
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]      
Mortgage Banking Derivatives      
Notional or Contractual Amount $ 13,500 9,315  
Fair value (15) (50)  
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]      
Mortgage Banking Derivatives      
Notional or Contractual Amount 10,167 8,815  
Fair value $ 265 $ 209