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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 10,382,634   $ 10,382,634   $ 8,952,391
Available for sale securities 10,514,414   10,514,414   8,857,120
Available-for-sale Securities, Gross Unrealized Gain 150,711   150,711   42,986
Available-for-sale Securities, Gross Unrealized Loss (18,931)   (18,931)   (138,257)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Proceeds from sales of available for sale securities 122,098 $ 142,743 367,357 $ 187,533  
Available-for-sale Securities, Gross realized gains 1,029 257 6,327 450  
Available-for-sale Securities, Gross realized losses 0 (1,019) (5,222) (1,502)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 262 $ (194) 281 $ (268)  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 10,300,000   10,300,000   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 90,708   90,708    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 968,503   968,503    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,571,395   1,571,395    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 440,609   440,609    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 3,071,215   3,071,215    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 90,536   90,536    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 974,073   974,073    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,600,106   1,600,106    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 447,901   447,901    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 3,112,616   $ 3,112,616    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 7.35   7.35    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 1,887   $ 1,887   496
Available for sale securities 1,889   1,889   493
Available-for-sale Securities, Gross Unrealized Gain 3   3   0
Available-for-sale Securities, Gross Unrealized Loss (1)   (1)   (3)
Municipal and other tax-exempt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 2,386   2,386   2,782
Available for sale securities 2,470   2,470   2,864
Available-for-sale Securities, Gross Unrealized Gain 84   84   82
Available-for-sale Securities, Gross Unrealized Loss 0   0   0
Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 3,066,442   3,066,442   2,986,297
Available for sale securities 3,107,785   3,107,785   2,953,889
Available-for-sale Securities, Gross Unrealized Gain 44,783   44,783   7,955
Available-for-sale Securities, Gross Unrealized Loss (3,440)   (3,440)   (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]          
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 7,311,419   7,311,419    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 7,401,798   $ 7,401,798    
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 7,280,092   $ 7,280,092   5,886,323
Available for sale securities 7,354,741   7,354,741   5,804,708
Available-for-sale Securities, Gross Unrealized Gain 90,111   90,111   16,149
Available-for-sale Securities, Gross Unrealized Loss (15,462)   (15,462)   (97,764)
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 31,327   31,327   40,948
Available for sale securities 47,057   47,057   59,736
Available-for-sale Securities, Gross Unrealized Gain 15,730   15,730   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.