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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]          
Money market investments $ 14,617 $ 8,035 $ 14,617 $ 8,035 $ 6,775
Securitized GNMA pools retained, amortized cost $ 46,200 $ 45,700 $ 46,200 $ 45,700  
Securitized GNMA pool retained, yield 2.69% 3.42% 2.69% 3.42%  
Proceeds from sale of available for sale securities     $ 316,300 $ 680,500  
Sale of securities $ 0 $ 3,498 $ 4,728 $ 8,274