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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 10,846,491   $ 10,846,491   $ 8,952,391
Available for sale securities 11,024,551   11,024,551   8,857,120
Available-for-sale Securities, Gross Unrealized Gain 191,716   191,716   42,986
Available-for-sale Securities, Gross Unrealized Loss (13,656)   (13,656)   (138,257)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds from sales of available for sale securities 261,028 $ 45,293 628,385 $ 232,826  
Available-for-sale Securities, Gross realized gains 989 250 7,316 700  
Available-for-sale Securities, Gross realized losses (984) 0 (6,206) (1,502)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 1 $ 64 282 $ (204)  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 10,800,000   10,800,000   9,100,000
Fixed Maturity Securities [Member]          
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 35,845   35,845    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,069,415   1,069,415    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,476,121   1,476,121    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 599,373   599,373    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 3,180,754   3,180,754    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 35,806   35,806    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,081,571   1,081,571    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,512,308   1,512,308    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 609,602   609,602    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 3,239,287   $ 3,239,287    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 8.29   8.29    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 2,294   $ 2,294   496
Available for sale securities 2,296   2,296   493
Available-for-sale Securities, Gross Unrealized Gain 2   2   0
Available-for-sale Securities, Gross Unrealized Loss 0   0   (3)
Municipal and other tax-exempt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 1,772   1,772   2,782
Available for sale securities 1,848   1,848   2,864
Available-for-sale Securities, Gross Unrealized Gain 76   76   82
Available-for-sale Securities, Gross Unrealized Loss 0   0   0
Commercial agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 3,176,188   3,176,188   2,986,297
Available for sale securities 3,234,671   3,234,671   2,953,889
Available-for-sale Securities, Gross Unrealized Gain 61,003   61,003   7,955
Available-for-sale Securities, Gross Unrealized Loss (2,520)   (2,520)   (40,363)
Other debt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 500   500   35,545
Available for sale securities 472   472   35,430
Available-for-sale Securities, Gross Unrealized Gain 0   0   12
Available-for-sale Securities, Gross Unrealized Loss (28)   (28)   (127)
Residential Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost [2] 7,665,737   7,665,737    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 7,785,264   $ 7,785,264    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities     4 years    
Residential agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 7,636,923   $ 7,636,923   5,886,323
Available for sale securities 7,740,461   7,740,461   5,804,708
Available-for-sale Securities, Gross Unrealized Gain 114,646   114,646   16,149
Available-for-sale Securities, Gross Unrealized Loss (11,108)   (11,108)   (97,764)
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 28,814   28,814   40,948
Available for sale securities 44,803   44,803   59,736
Available-for-sale Securities, Gross Unrealized Gain 15,989   15,989   18,788
Available-for-sale Securities, Gross Unrealized Loss $ 0   $ 0   $ 0
[1]
Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2]
The average expected lives of residential mortgage-backed securities were 4.0 years based upon current prepayment assumptions.