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Loans Receivable - Mortgage Banking Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]      
Loans held for sale $ 4,932 $ 5,533  
Residential real estate      
Residential real estate:      
Originated 191,207 150,030 $ 121,998
Sold 137,580 68,238 76,834
Gains on sales of loans, net 5,044 2,159 $ 2,403
Contractual amounts of commitments to sell and fund with off-balance sheet risk:      
Commitments to sell residential real estate loans 18,127 8,815  
Commitments to fund residential real estate loans (at interest rates approximating market rates) for portfolio or for sale:      
Fixed rate 19,640 15,509  
Variable or adjustable rate 98 3,111  
Total commitments to fund residential real estate loans $ 19,738 $ 18,620