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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 9,027,806   $ 8,952,391
Available for sale securities 9,025,198   8,857,120
Available-for-sale Securities, Gross Unrealized Gain 66,888   42,986
Available-for-sale Securities, Gross Unrealized Loss (69,496)   (138,257)
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 10,300,000   $ 9,100,000
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Proceeds from sales of available for sale securities 245,259 $ 44,790  
Available-for-sale Securities, Gross realized gains 5,298 193  
Available-for-sale Securities, Gross realized losses (5,222) (483)  
Available-for-sale Securities, Related federal and state income tax expense $ 19 $ (74)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 415   490
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 732,623   $ 700,064
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 4,843,129   5,631,803
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 5,575,752   6,331,867
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,849   1,615
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 67,647   136,642
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 69,496   138,257
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 94,933    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 983,438    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,467,481    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 391,939    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 2,937,791    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 94,398    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 976,737    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,473,499    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 392,520    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value $ 2,937,154    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity 7.30    
U.S. Treasury [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 1,880   496
Available for sale securities 1,878   493
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (2)   $ (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0   $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 495   493
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 495   493
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2   3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 2   3
Municipal and other tax-exempt securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 2,365   2,782
Available for sale securities 2,447   2,864
Available-for-sale Securities, Gross Unrealized Gain 82   82
Available-for-sale Securities, Gross Unrealized Loss 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 2,933,046   2,986,297
Available for sale securities 2,932,357   2,953,889
Available-for-sale Securities, Gross Unrealized Gain 17,022   7,955
Available-for-sale Securities, Gross Unrealized Loss $ (17,711)   $ (40,363)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 169   197
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 432,254   $ 179,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,590,803   1,969,504
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,023,057   2,148,762
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 833   394
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16,878   39,969
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 17,711   40,363
Other debt securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 500   35,545
Available for sale securities 472   35,430
Available-for-sale Securities, Gross Unrealized Gain 0   12
Available-for-sale Securities, Gross Unrealized Loss $ (28)   $ (127)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   3
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0   $ 9,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 472   20,436
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 472   30,418
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   63
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 28   64
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 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 6,090,015    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value $ 6,088,044    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 1 month 6 days    
Residential agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 6,056,710   5,886,323
Available for sale securities 6,040,086   5,804,708
Available-for-sale Securities, Gross Unrealized Gain 35,131   16,149
Available-for-sale Securities, Gross Unrealized Loss $ (51,755)   $ (97,764)
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 244   289
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 300,369   $ 510,824
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,251,359   3,641,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,551,728   4,152,194
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,016   1,158
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 50,739   96,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 51,755   97,764
Residential non-agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 33,305   40,948
Available for sale securities 47,958   59,736
Available-for-sale Securities, Gross Unrealized Gain 14,653   18,788
Available-for-sale Securities, Gross Unrealized Loss $ 0   $ 0