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Available for Sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 51 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis $ 10,830,525 $ 11,032,634 $ 9,909,320 $ 10,830,525
Available-for-sale Securities, Fair Value 11,059,145 11,287,221 10,186,597 11,059,145
Available-for-sale Securities, Gross Unrealized Gains 237,272 [1] 261,184 [1] 326,690 [1] 237,272 [1]
Available-for-sale Securities, Gross Unrealized Losses (5,833) [1] (2,414) [1] (5,741) [1] (5,833) [1]
Available-for-Sale Securities, Other Than Temporary Impairments (2,819) [2] (4,183) [2] (43,672) [2] (2,819) [2]
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Nominal Yield 2.05%     2.05%
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]        
Available-for-sale Securities, Proceeds 728,424   991,941  
Available-for-sale Securities, Gross Realized Gains 5,792   11,685  
Available-for-sale Securities, Gross Realized Losses (936)   (7,354)  
Available-for-sale Securities, Related federal and state income tax expense 1,889   1,685  
Available-for-sale Securities, Pledged as Collateral [Abstract]        
Available-for-sale Securities, Pledged As Collateral, Amortized Cost 4,415,455 4,070,250 3,796,475 4,415,455
Available-for-sale Securities, Pledged As Collateral, Fair Value 4,524,553 4,186,390 3,952,018 4,524,553
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 147 106 148 147
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,534,539 448,144 1,180,366 1,534,539
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 60,145 159,428 343,433 60,145
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,594,684 607,572 1,523,799 1,594,684
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 6,136 1,850 4,892 6,136
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 2,516 4,747 44,521 2,516
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 8,652 6,597 49,413 8,652
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 10,360,983 [3]     10,360,983 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 10,571,558 [3]     10,571,558 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 55,741     55,741
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 57,216     57,216
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 73,164     73,164
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 77,809     77,809
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 319,822     319,822
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 328,095     328,095
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 20,815     20,815
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 24,467     24,467
Fixed Maturity Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 1,524,075     1,524,075
Available-for-sale Securities, Fair Value 1,527,872     1,527,872
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 2,667     2,667
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 375,488     375,488
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,033,950     1,033,950
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 111,970     111,970
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 2,701     2,701
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 378,646     378,646
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,035,466     1,035,466
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 111,059     111,059
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.21%     0.21%
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 1.13%     1.13%
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 1.38%     1.38%
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 2.04%     2.04%
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.36%     1.36%
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity 8.01 [4]     8.01 [4]
US Treasury Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 1,000 1,000 1,001 1,000
Available-for-sale Securities, Fair Value 1,000 1,002 1,004 1,000
Available-for-sale Securities, Gross Unrealized Gains 0 [1] 2 [1] 3 [1] 0 [1]
Available-for-sale Securities, Gross Unrealized Losses 0 [1] 0 [1] 0 [1] 0 [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 1,000     1,000
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 0     0
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 0     0
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 0     0
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 1,000     1,000
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 0     0
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 0     0
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 0     0
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.55%     0.55%
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 0.00%     0.00%
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 0.00%     0.00%
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 0.00%     0.00%
Available-for-sale Securities, Debt Maturities, Nominal Yield 0.55%     0.55%
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity 0.08 [4]     0.08 [4]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 1,000 [3]     1,000 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 1,000 [3]     1,000 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Municipal and Other Tax-exempt Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 84,831 84,892 70,286 84,831
Available-for-sale Securities, Fair Value 85,447 87,142 72,234 85,447
Available-for-sale Securities, Gross Unrealized Gains 2,377 [1] 2,414 [1] 2,426 [1] 2,377 [1]
Available-for-sale Securities, Gross Unrealized Losses (1,263) [1] (164) [1] (206) [1] (1,263) [1]
Available-for-Sale Securities, Other Than Temporary Impairments (498) [2] 0 [2] (272) [2] (498) [2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 1,667     1,667
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 32,230     32,230
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 7,652     7,652
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 43,282     43,282
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 1,701     1,701
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 33,915     33,915
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 8,118     8,118
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 41,713     41,713
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.00% [5]     0.00% [5]
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 0.94% [5]     0.94% [5]
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 0.77% [5]     0.77% [5]
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 2.85% [5],[6]     2.85% [5],[6]
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.88% [5]     1.88% [5]
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity 14.32 [4]     14.32 [4]
Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation 39.00%     39.00%
Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset 35 days     35 days
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 53 [7] 38 60 [8] 53 [7]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, OTTI Portion, Number of Positions 21   21 21
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 10,390 [7] 6,150 25,284 [8] 10,390 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 29,724 [7] 26,108 19,970 [8] 29,724 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 40,114 [7] 32,258 45,254 [8] 40,114 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, OTTI Portion, Fair Value 7,424   12,754 7,424
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Fair Value 4,462   0 4,462
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Fair Value 11,886   12,754 11,886
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 397 [7] 11 395 [8] 397 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 1,364 [7] 153 83 [8] 1,364 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 1,761 [7] 164 478 [8] 1,761 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 310   272 310
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Aggregate Losses 188   0 188
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Aggregate Losses 498   272 498
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 50,341     50,341
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 52,023     52,023
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 20,743     20,743
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 20,091     20,091
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 12,384     12,384
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 11,887     11,887
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 1,363     1,363
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 1,446     1,446
Commercial Mortgage Backed Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 1,402,594 890,746   1,402,594
Available-for-sale Securities, Fair Value 1,405,346 895,075   1,405,346
Available-for-sale Securities, Gross Unrealized Gains 4,693 5,006   4,693
Available-for-sale Securities, Gross Unrealized Losses (1,941) [1] (677) [9]   (1,941) [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2]   0 [2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 0     0
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 313,008     313,008
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,026,298     1,026,298
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 63,288     63,288
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 0     0
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 313,845     313,845
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,027,348     1,027,348
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 64,153     64,153
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.00%     0.00%
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 1.09%     1.09%
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 1.38%     1.38%
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 1.55%     1.55%
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.32%     1.32%
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity 7.68 [4]     7.68 [4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 49 8   49
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 604,290 275,065   604,290
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 604,290 275,065   604,290
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 1,941 677   1,941
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 1,941 677   1,941
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 1,402,594 [3]     1,402,594 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 1,405,346 [3]     1,405,346 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Other Debt Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 35,650 35,680 36,269 35,650
Available-for-sale Securities, Fair Value 36,079 36,389 36,777 36,079
Available-for-sale Securities, Gross Unrealized Gains 635 [1] 709 [1] 508 [1] 635 [1]
Available-for-sale Securities, Gross Unrealized Losses (206) [1] 0 [1] 0 [1] (206) [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis 0     0
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 30,250     30,250
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 0     0
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 5,400     5,400
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 0     0
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 30,886     30,886
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 0     0
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 5,193     5,193
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield 0.00%     0.00%
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield 1.80%     1.80%
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield 0.00%     0.00%
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield 1.29% [6]     1.29% [6]
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.74%     1.74%
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity 6.22 [4]     6.22 [4]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4 3   4
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,712 4,899   4,712
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 481 0   481
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 5,193 4,899   5,193
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 187 0   187
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 19 0   19
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 206 0   206
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 5,400     5,400
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 5,193     5,193
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 30,250     30,250
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 30,886     30,886
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Residential Mortgage Backed Securities [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 9,264,827 9,973,552 9,749,623 9,264,827
Available-for-sale Securities, Fair Value 9,481,420 10,214,984 10,004,115 9,481,420
Available-for-sale Securities, Gross Unrealized Gains 221,332 [1] 246,910 [1] 303,090 [1] 221,332 [1]
Available-for-sale Securities, Gross Unrealized Losses (2,418) [1] (1,295) [1] (5,198) [1] (2,418) [1]
Available-for-Sale Securities, Other Than Temporary Impairments (2,321) [2] (4,183) [2] (43,400) [2] (2,321) [2]
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Nominal Yield 2.17% [10]     2.17% [10]
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 2 years 292 days     2 years 292 days
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 38 35 84 38
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 914,549 161,828 1,150,499 914,549
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 29,940 131,159 323,463 29,940
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 944,489 292,987 1,473,962 944,489
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 3,606 1,161 4,160 3,606
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 1,133 4,317 44,438 1,133
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 4,739 5,478 48,598 4,739
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 8,957,389 [3]     8,957,389 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 9,165,212 [3]     9,165,212 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 307,438     307,438
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 316,208     316,208
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 8,957,389 9,650,650 9,378,578 8,957,389
Available-for-sale Securities, Fair Value 9,165,212 9,889,821 9,677,602 9,165,212
Available-for-sale Securities, Gross Unrealized Gains 210,102 [1] 240,332 [1] 303,090 [1] 210,102 [1]
Available-for-sale Securities, Gross Unrealized Losses (2,279) [1] (1,161) [1] (4,066) [1] (2,279) [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 26 12 35 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 875,087 161,828 1,147,449 875,087
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 875,087 161,828 1,147,449 875,087
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 2,279 1,161 4,066 2,279
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 2,279 1,161 4,066 2,279
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 8,957,389 [3]     8,957,389 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 9,165,212 [3]     9,165,212 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 5,036,888 5,308,463 5,352,645 5,036,888
Available-for-sale Securities, Fair Value 5,161,971 5,453,549 5,521,695 5,161,971
Available-for-sale Securities, Gross Unrealized Gains 127,362 [1] 146,247 [1] 171,892 [1] 127,362 [1]
Available-for-sale Securities, Gross Unrealized Losses (2,279) [1] (1,161) [1] (2,842) [1] (2,279) [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 26 12 10 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 875,087 161,828 453,557 875,087
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 875,087 161,828 453,557 875,087
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 2,279 1,161 2,842 2,279
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 2,279 1,161 2,842 2,279
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 5,036,888 [3]     5,036,888 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 5,161,971 [3]     5,161,971 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 2,747,896 2,978,608 3,038,083 2,747,896
Available-for-sale Securities, Fair Value 2,809,286 3,045,564 3,128,573 2,809,286
Available-for-sale Securities, Gross Unrealized Gains 61,390 [1] 66,956 [1] 91,304 [1] 61,390 [1]
Available-for-sale Securities, Gross Unrealized Losses 0 [1] 0 [1] (814) [1] 0 [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0 0 17 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0 518,483 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 0 518,483 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 0 814 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 0 0 814 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 2,747,896 [3]     2,747,896 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 2,809,286 [3]     2,809,286 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 1,044,086 1,215,554 780,001 1,044,086
Available-for-sale Securities, Fair Value 1,060,870 1,237,041 812,484 1,060,870
Available-for-sale Securities, Gross Unrealized Gains 16,784 [1] 21,487 [1] 32,893 [1] 16,784 [1]
Available-for-sale Securities, Gross Unrealized Losses 0 [1] 0 [1] (410) [1] 0 [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0 0 8 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0 175,409 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 0 175,409 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 0 410 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 0 0 410 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 1,044,086 [3]     1,044,086 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 1,060,870 [3]     1,060,870 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Other [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 128,519 148,025 207,849 128,519
Available-for-sale Securities, Fair Value 133,085 153,667 214,850 133,085
Available-for-sale Securities, Gross Unrealized Gains 4,566 [1] 5,642 [1] 7,001 [1] 4,566 [1]
Available-for-sale Securities, Gross Unrealized Losses 0 [1] 0 [1] 0 [1] 0 [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 128,519 [3]     128,519 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 133,085 [3]     133,085 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Mortgage-backed Securities, Issued by Private Enterprises [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 307,438 322,902 371,045 307,438
Available-for-sale Securities, Fair Value 316,208 325,163 326,513 316,208
Available-for-sale Securities, Gross Unrealized Gains 11,230 [1] 6,578 [1] 0 [1] 11,230 [1]
Available-for-sale Securities, Gross Unrealized Losses (139) [1] (134) [1] (1,132) [1] (139) [1]
Available-for-Sale Securities, Other Than Temporary Impairments (2,321) [2] (4,183) [2] (43,400) [2] (2,321) [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 12 [7] 23 [7] 49 [8] 12 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 39,462 [7] 0 [7] 3,050 [8] 39,462 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 29,940 [7] 131,159 [7] 323,463 [8] 29,940 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 69,402 [7] 131,159 [7] 326,513 [8] 69,402 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 1,327 [7] 0 [7] 94 [8] 1,327 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 1,133 [7] 4,317 [7] 44,438 [8] 1,133 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 2,460 [7] 4,317 [7] 44,532 [8] 2,460 [7]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 307,438     307,438
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 316,208     316,208
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Privately Issued Mortgage-backed Securities [Abstract]        
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Number of Securities 49     49
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Credit losses Recognized [Abstract]        
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Number of Securities with Credit Losses In Current Period 3     47
Amount of Credit Losses Recognized in Current Period 247     71,888
Other Than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Assumptions Used to Develop Projected Cash Flows [Abstract]        
Unemployment rate Increasing to 8% over the next 12 months and remain at 8% thereafter Increasing to 8.5% over the next 12 months, dropping to 8% over the following 21 months and holding at 8% thereafter. Increasing to 9.5% over the next 12 months, dropping to 8% over the following 21 months and holding at 8% thereafter.  
Housing price appreciation/depreciation Starting with current depreciated housing prices based on information from derived from the FHFA1, increasing 2% over the next 12 months, then flat for the following 12 months and then growing at 2% per year thereafter. Starting with current depreciated housing prices based on information from derived from the FHFA1, decreasing 2% over the next 12 months, then flat for the following 12 months and then growing at 2% per year thereafter. Starting with current depreciated housing prices based on information from derived from the FHFA1, decreasing 6% over the next 12 months and then growing at 2% per year thereafter.  
Estimated liquidation costs Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company. Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company. Reflect actual historical liquidations costs observed on Jumbo and Alt-A residential mortgage loans in securities owned by the Company.  
Discount rates Estimated cash flows were discounted at rates that range from 2.00% to 6.25% based on our current expected yields. Estimated cash flows were discounted at rates that range from 2.00% to 6.25% based on our current expected yields. Estimated cash flows were discounted at rates that range from 2.00% to 6.25% based on our current expected yields.  
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Alt A [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 119,373 124,314 140,142 119,373
Available-for-sale Securities, Fair Value 124,164 123,174 120,187 124,164
Available-for-sale Securities, Gross Unrealized Gains 5,198 [1] 1,440 [1] 0 [1] 5,198 [1]
Available-for-sale Securities, Gross Unrealized Losses 0 [1] 0 [1] 0 [1] 0 [1]
Available-for-Sale Securities, Other Than Temporary Impairments (407) [2] (2,580) [2] (19,955) [2] (407) [2]
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 [7] 12 [7] 16 [8] 1 [7]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, OTTI Portion, Number of Positions 1 12 16 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 [7] 0 [7] 0 [8] 0 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,500 [7] 87,907 [7] 120,187 [8] 3,500 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,500 [7] 87,907 [7] 120,187 [8] 3,500 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, OTTI Portion, Fair Value 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Fair Value 3,500 87,907 120,187 3,500
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Fair Value 3,500 87,907 120,187 3,500
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 [7] 0 [7] 0 [8] 0 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 407 [7] 2,580 [7] 19,955 [8] 407 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 407 [7] 2,580 [7] 19,955 [8] 407 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Aggregate Losses 407 2,580 19,955 407
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Aggregate Losses 407 2,580 19,955 407
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 119,373     119,373
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 124,164     124,164
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Privately Issued Mortgage-backed Securities [Abstract]        
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Number of Securities 16     16
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Credit losses Recognized [Abstract]        
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Number of Securities with Credit Losses In Current Period 3     16
Amount of Credit Losses Recognized in Current Period 247     48,436
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Jumbo A Loans [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 188,065 198,588 230,903 188,065
Available-for-sale Securities, Fair Value 192,044 201,989 206,326 192,044
Available-for-sale Securities, Gross Unrealized Gains 6,032 [1] 5,138 [1] 0 [1] 6,032 [1]
Available-for-sale Securities, Gross Unrealized Losses (139) [1] (134) [1] (1,132) [1] (139) [1]
Available-for-Sale Securities, Other Than Temporary Impairments (1,914) [2] (1,603) [2] (23,445) [2] (1,914) [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 11 [7] 11 [7] 33 [8] 11 [7]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, OTTI Portion, Number of Positions 10 10 29 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 39,462 [7] 0 [7] 3,050 [8] 39,462 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 26,440 [7] 43,252 [7] 203,276 [8] 26,440 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 65,902 [7] 43,252 [7] 206,326 [8] 65,902 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, OTTI Portion, Fair Value 39,462 0 3,050 39,462
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Fair Value 13,248 29,128 182,766 13,248
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Fair Value 52,710 29,128 185,816 52,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 1,327 [7] 0 [7] 94 [8] 1,327 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 726 [7] 1,737 [7] 24,483 [8] 726 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 2,053 [7] 1,737 [7] 24,577 [8] 2,053 [7]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 1,327 0 94 1,327
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Aggregate Losses 587 1,602 23,351 587
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Aggregate Losses 1,914 1,602 23,445 1,914
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 188,065     188,065
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 192,044     192,044
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized in Earnings, Net Qualitative Disclosures, Privately Issued Mortgage-backed Securities [Abstract]        
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Number of Securities 33     33
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Credit losses Recognized [Abstract]        
Available-for-sale Securities, Privately Issued Residential Mortgage-backed Securities, Number of Securities with Credit Losses In Current Period 0     31
Amount of Credit Losses Recognized in Current Period 0     23,452
Perpetual Preferred, Equity Securities and Mutual Funds [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 41,623     41,623
Available-for-sale Securities, Fair Value 49,853     49,853
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]        
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.32%     1.32%
Perpetual Preferred Stock [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 22,171 22,171 19,171 22,171
Available-for-sale Securities, Fair Value 26,832 25,072 21,024 26,832
Available-for-sale Securities, Gross Unrealized Gains 4,661 [1] 2,901 [1] 1,862 [1] 4,661 [1]
Available-for-sale Securities, Gross Unrealized Losses 0 [1] 0 [1] (9) [1] 0 [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0 0 1 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0 1,941 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 0 1,941 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 0 9 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 0 0 9 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 22,171     22,171
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 26,832     26,832
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 0     0
Equity Securities And Mutual Funds [Member]
        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 19,452 24,593 32,970 19,452
Available-for-sale Securities, Fair Value 23,021 27,557 51,443 23,021
Available-for-sale Securities, Gross Unrealized Gains 3,574 [1] 3,242 [1] 18,801 [1] 3,574 [1]
Available-for-sale Securities, Gross Unrealized Losses (5) [1] (278) [1] (328) [1] (5) [1]
Available-for-Sale Securities, Other Than Temporary Impairments 0 [2] 0 [2] 0 [2] 0 [2]
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]        
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3 22 3 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 598 202 2,642 598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 2,161 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 598 2,363 2,642 598
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 5 1 328 5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 277 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 5 278 328 5
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Portion Recognized In Earnings, Net Qualitative Disclosures, Lowest Current Credit Rating [Abstract]        
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Amortized Cost 0 [3]     0 [3]
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [3]     0 [3]
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 0     0
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0     0
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 19,452     19,452
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value $ 23,021     $ 23,021
[1] Gross unrealized gain/ loss recognized in AOCI in the consolidated balance sheet.
[2] Amounts represent unrealized loss that remains in AOCI after an other-than-temporary credit loss has been recognized in income.
[3] U.S. government and government sponsored enterprises are not rated by the nationally-recognized rating agencies as these securities are guaranteed by agencies of the U.S. government or government-sponsored enterprises.
[4] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[5] Calculated on a taxable equivalent basis using a 39% effective tax rate.
[6] Nominal yield on municipal and other tax-exempt securities and other debt securities with contractual maturity dates over ten years are based on variable rates which generally are reset within 35 days.
[7] Includes the following securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income:
[8] Includes the following securities for which an unrealized loss remains in AOCI after an other-than-temporary credit loss has been recognized in income:Municipal and other tax-exempt 21 12,754 272 — — 12,754 272Alt-A loans 16 — — 120,187 19,955 120,187 19,955Jumbo-A loans 29 3,050 94 182,766 23,351 185,816 23,445
[9] Gross unrealized gain/loss recognized in AOCI in the consolidated balance sheet
[10] The nominal yield on mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments. See Quarterly Financial Summary –– Unaudited following for current yields on available for sale securities portfolio.