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Mortgage Banking Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mortgage Banking Derivatives      
Amount of loans sold to investors $ 384,400    
Proceeds from sale of loan to investors 388,538 $ 168,472 $ 137,622
Gain on sale of loan 15,519 5,112 $ 3,791
Federal National Mortgage Association [Member]      
Mortgage Banking Derivatives      
Amount of loans sold to investors $ 312,000    
Federal National Mortgage Association [Member] | Customer Concentration Risk [Member]      
Mortgage Banking Derivatives      
Percentage of concentration risk 83.20%    
Federal Home Loan Mortgage Corporation [Member]      
Mortgage Banking Derivatives      
Amount of loans sold to investors $ 44,200    
Federal Home Loan Mortgage Corporation [Member] | Customer Concentration Risk [Member]      
Mortgage Banking Derivatives      
Percentage of concentration risk 11.80%    
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]      
Mortgage Banking Derivatives      
Notional or Contractual Amount $ 46,500 13,500  
Fair value (228) (15)  
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]      
Mortgage Banking Derivatives      
Notional or Contractual Amount 37,972 10,167  
Fair value $ 1,068 $ 265