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Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net realized gain on sales of residential mortgage securities |  |  |  |  |  |  |  |  |  | $ 62,002,000 | $ 61,307,000 | $ 39,577,000
Net income available to common stock and participating securities | $ 96,871,000 | $ 91,849,000 | $ 89,290,000 | $ 85,107,000 | $ 57,129,000 | $ 83,382,000 | $ 66,645,000 | $ 79,645,000 |  | 362,030,000 | 285,858,000 | 306,502,000
Total reclassifications for period |  |  |  |  |  |  |  |  |  | (47,234,000) | (52,839,000) | (39,739,000)
Accumulated Other Comprehensive Income/(Loss) |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses recorded in AOCI on securities for which Other-than-temporary impairments had been recognized in earnings in prior periods | $ 0 |  |  |  | $ 224,000 |  |  |  |  | 0 | 224,000 |
Amounts Reclassified from AOCI | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net realized gain on sales of residential mortgage securities |  |  |  |  |  |  |  |  |  | (44,600,000) | (51,580,000) | (38,707,000)
OTTI recognized in earnings |  |  |  |  |  |  |  |  |  | (180,000) | (1,259,000) | (1,032,000)
Net income available to common stock and participating securities |  |  |  |  |  |  |  |  |  | (44,780,000) | (52,839,000) | (39,739,000)
Amortization of de-designated hedging instruments |  |  |  |  |  |  |  |  |  | (2,454,000) |  |
Total Swaps designated as cash flow hedges |  |  |  |  |  |  |  |  |  | $ (2,454,000) |  |
Amounts Reclassified from AOCI | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of de-designated hedging instruments |  |  |  |  |  |  |  |  | $ 0 |  |  | 0
Total Swaps designated as cash flow hedges |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0

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