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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 11,988,585   $ 11,988,585   $ 11,131,494
Available-for-sale Securities, Fair Value 12,475,919   12,475,919   11,269,643
Available-for-sale Securities, Gross Unrealized Gain 490,998   490,998   158,435
Available-for-sale Securities, Gross Unrealized Loss (3,664)   (3,664)   (20,286)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale Securities, Proceeds 179,051 $ 122,098 205,945 $ 367,357  
Available-for-sale Securities, Gross realized gains 5,580 1,029 5,583 6,327  
Available-for-sale Securities, Gross realized losses 0 0 0 (5,222)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 1,421 $ 262 1,422 $ 281  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 12,300,000   12,300,000   10,100,000
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 34,044   34,044    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,321,471   1,321,471    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,241,310   1,241,310    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 580,353   580,353    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 3,177,178   3,177,178    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 34,144   34,144    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,375,128   1,375,128    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,280,251   1,280,251    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 603,908   603,908    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 3,293,431   $ 3,293,431    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 8.03   8.03    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 900   $ 900   1,598
Available-for-sale Securities, Fair Value 912   912   1,600
Available-for-sale Securities, Gross Unrealized Gain 12   12   2
Available-for-sale Securities, Gross Unrealized Loss 0   0   0
Municipal and other tax-exempt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 29,670   29,670   1,789
Available-for-sale Securities, Fair Value 31,240   31,240   1,861
Available-for-sale Securities, Gross Unrealized Gain 1,570   1,570   72
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 3,146,108   3,146,108   3,145,342
Available-for-sale Securities, Fair Value 3,260,807   3,260,807   3,178,005
Available-for-sale Securities, Gross Unrealized Gain 116,042   116,042   37,808
Available-for-sale Securities, Gross Unrealized Loss (1,343)   (1,343)   (5,145)
Other debt securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 500   500   500
Available-for-sale Securities, Fair Value 472   472   472
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss (28)   (28)   (28)
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] 8,811,407   8,811,407    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 9,182,488   $ 9,182,488    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities     3.1 years    
Residential agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 8,789,466   $ 8,789,466   7,956,297
Available-for-sale Securities, Fair Value 9,147,238   9,147,238   8,046,096
Available-for-sale Securities, Gross Unrealized Gain 360,056   360,056   104,912
Available-for-sale Securities, Gross Unrealized Loss (2,284)   (2,284)   (15,113)
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 21,941   21,941   25,968
Available-for-sale Securities, Fair Value 35,250   35,250   41,609
Available-for-sale Securities, Gross Unrealized Gain 13,318   13,318   15,641
Available-for-sale Securities, Gross Unrealized Loss $ (9)   $ (9)   $ 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 3.1 years based upon current prepayment assumptions.