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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]      
Money market investments $ 11,401 $ 10,203 $ 11,908
Securitized GNMA pools retained, amortized cost $ 30,000 $ 26,800  
Securitized GNMA pool retained, yield 2.22% 2.82%  
Gain on sales of mortgaged-backed securities   $ 4,700  
Proceeds from sale of available for sale securities   316,300  
Sale of securities $ 0 $ 4,728