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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 13,020,655   $ 13,020,655   $ 12,609,850
Available-for-sale Securities, Fair Value 13,317,922   13,317,922   13,050,665
Available-for-sale Securities, Gross Unrealized Gain 339,076   339,076   449,654
Available-for-sale Securities, Gross Unrealized Loss (41,809)   (41,809)   (8,839)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale Securities, Proceeds 338,109 $ 179,051 394,146 $ 205,945  
Available-for-sale Securities, Gross realized gains 1,767 5,580 2,240 5,583  
Available-for-sale Securities, Gross realized losses (337) 0 (343) 0  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 336 $ 1,421 455 $ 1,422  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value 9,500,000   9,500,000   11,600,000
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 85,688   85,688    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,714,881   1,714,881    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 2,116,584   2,116,584    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 683,362   683,362    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 4,600,515   4,600,515    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 86,175   86,175    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,764,174   1,764,174    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 2,116,490   2,116,490    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 697,946   697,946    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 4,664,785   $ 4,664,785    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 7.82   7.82    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 500   $ 500   500
Available-for-sale Securities, Fair Value 504   504   508
Available-for-sale Securities, Gross Unrealized Gain 4   4   8
Available-for-sale Securities, Gross Unrealized Loss 0   0   0
Municipal securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 387,257   387,257   165,318
Available-for-sale Securities, Fair Value 386,509   386,509   167,979
Available-for-sale Securities, Gross Unrealized Gain 1,798   1,798   2,666
Available-for-sale Securities, Gross Unrealized Loss (2,546)   (2,546)   (5)
Commercial agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 4,212,258   4,212,258   3,406,956
Available-for-sale Securities, Fair Value 4,277,301   4,277,301   3,508,465
Available-for-sale Securities, Gross Unrealized Gain 75,310   75,310   103,590
Available-for-sale Securities, Gross Unrealized Loss (10,267)   (10,267)   (2,081)
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 471   471   472
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss (29)   (29)   (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] 8,420,140   8,420,140    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 8,653,137   $ 8,653,137    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities     3.3 years    
Residential agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 8,406,672   $ 8,406,672   9,019,013
Available-for-sale Securities, Fair Value 8,624,876   8,624,876   9,340,471
Available-for-sale Securities, Gross Unrealized Gain 247,171   247,171   328,183
Available-for-sale Securities, Gross Unrealized Loss (28,967)   (28,967)   (6,725)
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 13,468   13,468   17,563
Available-for-sale Securities, Fair Value 28,261   28,261   32,770
Available-for-sale Securities, Gross Unrealized Gain 14,793   14,793   15,207
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 3.3 years based upon current prepayment assumptions.