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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]      
Money market investments $ 11,908 $ 6,775 $ 4,930
Securitized GNMA pools retained, amortized cost $ 90,100 $ 62,800 $ 56,800
Securitized GNMA pool retained, yield 2.48% 3.23% 3.93%
Gain on sales of mortgaged-backed securities $ 4,700 $ 8,300  
Proceeds from sale of available for sale securities 316,300 672,200 $ 17,800
Sale of securities $ 4,728 8,274 $ 0
Available-for-sale securities, acquired   $ 574,600  
Available for sale securities average yield percent   1.79%  
Available-for-sale term   1 year 7 months 6 days