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Available for Sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 54 Months Ended 3 Months Ended 54 Months Ended 3 Months Ended 54 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Fixed Maturity Securities [Member]
Jun. 30, 2013
U.S. Treasury securities [Member]
Dec. 31, 2012
U.S. Treasury securities [Member]
Jun. 30, 2012
U.S. Treasury securities [Member]
Jun. 30, 2013
Municipal and other tax-exempt securities [Member]
Dec. 31, 2012
Municipal and other tax-exempt securities [Member]
Jun. 30, 2012
Municipal and other tax-exempt securities [Member]
Jun. 30, 2013
Commercial mortgage-backed securities [Member]
Dec. 31, 2012
Commercial mortgage-backed securities [Member]
Jun. 30, 2013
Other debt securities [Member]
Dec. 31, 2012
Other debt securities [Member]
Jun. 30, 2012
Other debt securities [Member]
Jun. 30, 2013
Residential Mortgage Backed Securities [Member]
Dec. 31, 2012
Residential Mortgage Backed Securities [Member]
Jun. 30, 2012
Residential Mortgage Backed Securities [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Other [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Other [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Other [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Alt-A [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Alt-A [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Alt-A [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Alt-A [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jumbo-A Loans [Member]
Jun. 30, 2013
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jumbo-A Loans [Member]
Dec. 31, 2012
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jumbo-A Loans [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jumbo-A Loans [Member]
Jun. 30, 2013
Perpetual Preferred, Equity Securities and Mutual Funds [Member]
Jun. 30, 2013
Perpetual preferred stock [Member]
Dec. 31, 2012
Perpetual preferred stock [Member]
Jun. 30, 2012
Perpetual preferred stock [Member]
Jun. 30, 2013
Equity securities and mutual funds [Member]
Dec. 31, 2012
Equity securities and mutual funds [Member]
Jun. 30, 2012
Equity securities and mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]                                                                                                            
Available-for-sale Securities, Amortized Cost Basis $ 10,655,841 $ 10,153,162 $ 10,655,841 $ 10,153,162 $ 11,032,634 $ 2,018,242 $ 1,061 $ 1,000 $ 1,001 $ 95,974 $ 84,892 $ 86,808 $ 1,885,585 $ 890,746 $ 35,622 $ 35,680 $ 35,739 $ 8,595,437 $ 9,973,552 $ 9,986,158 $ 8,303,052 $ 9,650,650 $ 9,631,975 $ 4,648,337 $ 5,308,463 $ 5,270,918 $ 2,695,506 $ 2,978,608 $ 3,527,123 $ 916,646 $ 1,215,554 $ 645,103 $ 42,563 $ 148,025 $ 188,831 $ 292,385 $ 322,902 $ 354,183 $ 292,385 $ 113,804 $ 113,804 $ 124,314 $ 134,266 $ 178,581 $ 178,581 $ 198,588 $ 219,917 $ 42,162 $ 22,172 $ 22,171 $ 22,171 $ 19,990 $ 24,593 $ 21,285
Available-for-sale Securities, Fair Value 10,698,074 10,395,415 10,698,074 10,395,415 11,287,221 1,979,000 1,060 1,002 1,003 95,103 87,142 88,458 1,846,943 895,075 35,894 36,389 36,286 8,669,970 10,214,984 10,221,293 8,372,795 9,889,821 9,903,532 4,687,141 5,453,549 5,426,832 2,715,896 3,045,564 3,607,060 925,081 1,237,041 674,006 44,677 153,667 195,634 297,175 325,163 317,761 297,175 115,036 115,036 123,174 118,414 182,139 182,139 201,989 199,347 49,104 25,583 25,072 23,431 23,521 27,557 24,944
Available-for-sale Securities, Gross Unrealized Gain 141,240 [1] 283,564 [1] 141,240 [1] 283,564 [1] 261,184 [1]   0 [1] 2 [1] 2 [1] 1,653 [1] 2,414 [1] 2,430 [1] 343 [1] 5,006 [1] 479 [1] 709 [1] 559 [1] 131,590 [1] 246,910 [1] 274,772 [1] 124,556 [1] 240,332 [1] 274,154 [1] 78,285 [1] 146,247 [1] 156,699 [1] 32,994 [1] 66,956 [1] 81,679 [1] 11,163 [1] 21,487 [1] 28,973 [1] 2,114 [1] 5,642 [1] 6,803 [1] 7,034 [1] 6,578 [1] 618 [1] 7,034 [1] 2,905 [1] 2,905 [1] 1,440 [1] 0 [1] 4,129 [1] 4,129 [1] 5,138 [1] 618 [1]   3,439 [1] 2,901 [1] 1,812 [1] 3,736 [1] 3,242 [1] 3,989 [1]
Available-for-sale Securities, Gross Unrealized Loss (96,383) [1] (4,621) [1] (96,383) [1] (4,621) [1] (2,414) [1]   (1) [1] 0 [1] 0 [1] (1,870) [1] (164) [1] (187) [1] (38,985) [1] (677) [1] (207) [1] 0 [1] (12) [1] (55,087) [1] (1,295) [1] (3,540) [1] (54,813) [1] (1,161) [1] (2,597) [1] (39,481) [1] (1,161) [1] (785) [1] (12,604) [1] 0 [1] (1,742) [1] (2,728) [1] 0 [1] (70) [1] 0 [1] 0 [1] 0 [1] (274) [1] (134) [1] (943) [1] (274) [1] 0 [1] 0 [1] 0 [1] 0 [1] (274) [1] (274) [1] (134) [1] (943) [1]   (28) [1] 0 [1] (552) [1] (205) [1] (278) [1] (330) [1]
Available-for-Sale Securities, Other Than Temporary Impairments (2,624) [2] (36,690) [2] (2,624) [2] (36,690) [2] (4,183) [2]   0 [2] 0 [2] 0 [2] (654) [2] 0 [2] (593) [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] (1,970) [2] (4,183) [2] (36,097) [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] 0 [2] (1,970) [2] (4,183) [2] (36,097) [2] (1,970) [2] (1,673) [2] (1,673) [2] (2,580) [2] (15,852) [2] (297) [2] (297) [2] (1,603) [2] (20,245) [2]   0 [2] 0 [2] 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           2,745 1,061     1,684     0   0                                                                              
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis           478,400 0     33,591     414,587   30,222                                                                              
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis           1,156,553 0     6,382     1,150,171   0                                                                              
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis           380,544 0     54,317     320,827   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           2,765 1,060     1,705     0   0                                                                              
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value           474,547 0     34,777     409,069   30,701                                                                              
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value           1,127,637 0     6,621     1,121,016   0                                                                              
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value           374,051 0     52,000     316,858   5,193                                                                              
Available-for-sale Securities, Debt Maturities, Nominal Yield [Abstract]                                                                                                            
Available-for-sale Securities, Debt Maturities, Less than One Year, Nominal Yield           0.09% 0.24%     0.00% [3]     0.00%   0.00%                                                                              
Available-for-sale Securities, Debt Maturities, One to Five Years, Nominal Yield           1.12% 0.00%     0.95% [3]     1.08%   1.80%                                                                              
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Nominal Yield           1.33% 0.00%     0.69% [3]     1.34%   0.00%                                                                              
Available-for-sale Securities, Debt Maturities, Over Ten Years, Nominal Yield           1.52% 0.00%     2.55% [3],[4]     1.35%   1.41% [4]                                                                              
Available-for-sale Securities, Debt Maturities, Nominal Yield 1.85%   1.85%     1.32% 0.24%     1.82% [3]     1.28%   1.74%     1.97% [5]                                                           1.30%            
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity           10.84 [6] 1.68 [6]     14.84 [6]     10.74 [6]   5.98 [6]                                                                              
Available-for-sale Securities, Debt Maturities, Effective tax rate for nominal yield calculation                   39.00%                                                                                        
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities                                   3.5                                                                        
Available-for-sale Securities, Debt Maturities, Number of days for interest rates to reset                   35 days                                                                                        
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]                                                                                                            
Available-for-sale Securities, Proceeds 1,083,001 459,610 1,837,970 1,451,551                                                                                                    
Available-for-sale Securities, Gross realized gains 9,992 20,481 15,784 32,166                                                                                                    
Available-for-sale Securities, Gross realized losses (6,239) 0 (7,176) (7,354)                                                                                                    
Available-for-sale Securities, Related federal and state income tax expense 1,460 7,967 3,349 9,652                                                                                                    
Available-for-sale Securities, Pledged as Collateral [Abstract]                                                                                                            
Available-for-sale Securities, Pledged As Collateral, Amortized cost 5,078,098 3,552,776 5,078,098 3,552,776 4,070,250                                                                                                  
Available-for-sale Securities, Pledged As Collateral, Fair value 5,103,507 3,686,838 5,103,507 3,686,838 4,186,390                                                                                                  
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]                                                                                                            
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 347 153 347 153 106   1     86 [7] 38 66 [8] 113 8 4 3 2 135 35 68 123 12 25 72 12 13 38 0 10 13 0 2       12 [7] 23 [7] 43 [8] 12 [7] 10 [7] 10 [7] 12 [7] 16 [8] 2 [7] 2 [7] 11 [7] 27 [8]   1 0 5 7 22 12
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, OTTI Portion, Number of Positions                   21   21                                                       10 10 12 16 2 2 10 27              
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 5,476,851 1,076,874 5,476,851 1,076,874 448,144   1,060     66,168 [7] 6,150 21,950 [8] 1,730,306 275,065 5,193 4,899 0 3,665,593 161,828 1,041,628 3,596,297 161,828 1,041,628 2,196,603 161,828 528,649 1,202,545 0 438,190 197,149 0 74,789       69,296 [7] 0 [7] 0 [8] 69,296 [7] 51,681 [7] 51,681 [7] 0 [7] 0 [8] 17,615 [7] 17,615 [7] 0 [7] 0 [8]   4,973 0 10,717 3,558 202 2,579
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 15,677 321,500 15,677 321,500 159,428   0     0 [7] 26,108 27,864 [8] 0 0 0 0 988 15,677 131,159 292,648 0 0 0 0 0 0 0 0 0 0 0 0       15,677 [7] 131,159 [7] 292,648 [8] 15,677 [7] 3,379 [7] 3,379 [7] 87,907 [7] 118,414 [8] 12,298 [7] 12,298 [7] 43,252 [7] 174,234 [8]   0 0 0 0 2,161 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 5,492,528 1,398,374 5,492,528 1,398,374 607,572   1,060     66,168 [7] 32,258 49,814 [8] 1,730,306 275,065 5,193 4,899 988 3,681,270 292,987 1,334,276 3,596,297 161,828 1,041,628 2,196,603 161,828 528,649 1,202,545 0 438,190 197,149 0 74,789       84,973 [7] 131,159 [7] 292,648 [8] 84,973 [7] 55,060 [7] 55,060 [7] 87,907 [7] 118,414 [8] 29,913 [7] 29,913 [7] 43,252 [7] 174,234 [8]   4,973 0 10,717 3,558 2,363 2,579
Available-for-sale Securities, Continuous Unrealized Loss Position, Less Than Twelve Months, OTTI Portion, Fair Value                   11,731   12,804                                                       51,681 51,681 0 0 17,615 17,615 0 0              
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Fair Value                   0   0                                                       3,379 3,379 87,907 118,414 0 0 29,128 162,754              
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Fair Value                   11,731   12,804                                                       55,060 55,060 87,907 118,414 17,615 17,615 29,128 162,754              
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 98,295 4,119 98,295 4,119 1,850   1     2,524 [7] 11 640 [8] 38,985 677 207 0 0 56,345 1,161 2,597 54,813 1,161 2,597 39,481 1,161 785 12,604 0 1,742 2,728 0 70       1,532 [7] 0 [7] 0 [8] 1,532 [7] 1,236 [7] 1,236 [7] 0 [7] 0 [8] 296 [7] 296 [7] 0 [7] 0 [8]   28 0 552 205 1 330
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 712 37,192 712 37,192 4,747   0     0 [7] 153 140 [8] 0 0 0 0 12 712 4,317 37,040 0 0 0 0 0 0 0 0 0 0 0 0       712 [7] 4,317 [7] 37,040 [8] 712 [7] 437 [7] 437 [7] 2,580 [7] 15,852 [8] 275 [7] 275 [7] 1,737 [7] 21,188 [8]   0 0 0 0 277 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses 99,007 41,311 99,007 41,311 6,597   1     2,524 [7] 164 780 [8] 38,985 677 207 0 12 57,057 5,478 39,637 54,813 1,161 2,597 39,481 1,161 785 12,604 0 1,742 2,728 0 70       2,244 [7] 4,317 [7] 37,040 [8] 2,244 [7] 1,673 [7] 1,673 [7] 2,580 [7] 15,852 [8] 571 [7] 571 [7] 1,737 [7] 21,188 [8]   28 0 552 205 278 330
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses                   654   593                                                       1,236 1,236 0 0 296 296 0 0              
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, OTTI Portion, Aggregate Losses                   0   0                                                       437 437 2,580 15,852 0 0 1,602 20,245              
Available-for-sale Securities, Continuous Unrealized Loss Position, OTTI Portion, Aggregate Losses                   654   593                                                       1,673 1,673 2,580 15,852 296 296 1,602 20,245              
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 10,189,698 [9]   10,189,698 [9]       1,061 [9]     0 [9]     1,885,585 [9]   0 [9]     8,303,052 [9]     8,303,052 [9]     4,648,337 [9]     2,695,506 [9]     916,646 [9]     42,563 [9]     0 [9]     0 [9] 0 [9] 0 [9]     0 [9] 0 [9]       0 [9]     0 [9]    
Available-for-sale Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 10,220,798 [9]   10,220,798 [9]       1,060 [9]     0 [9]     1,846,943 [9]   0 [9]     8,372,795 [9]     8,372,795 [9]     4,687,141 [9]     2,715,896 [9]     925,081 [9]     44,677 [9]     0 [9]     0 [9] 0 [9] 0 [9]     0 [9] 0 [9]       0 [9]     0 [9]    
Available-for-sale securities, Portfolio Concentration Rated AAA To AA, Amortized Cost 66,295   66,295       0     60,895     0   5,400     0     0     0     0     0     0     0     0 0 0     0 0       0     0    
Available-for-sale Securities, Portfolio Concentration Rated AAA To AA, Fair Value 66,488   66,488       0     61,295     0   5,193     0     0     0     0     0     0     0     0 0 0     0 0       0     0    
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Amortized Cost 75,089   75,089       0     22,695     0   30,222     0     0     0     0     0     0     0     0 0 0     0 0       22,172     0    
Available-for-sale Securities, Portfolio Concentration Rated A To BBB, Fair Value 78,361   78,361       0     22,077     0   30,701     0     0     0     0     0     0     0     0 0 0     0 0       25,583     0    
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Amortized Cost 304,769   304,769       0     12,384     0   0     292,385     0     0     0     0     0     292,385     292,385 113,804 113,804     178,581 178,581       0     0    
Available-for-sale Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 308,906   308,906       0     11,731     0   0     297,175     0     0     0     0     0     297,175     297,175 115,036 115,036     182,139 182,139       0     0    
Available-for-sale Securities, Portfolio Concentration Not Rated, Amortized Cost 19,990   19,990       0     0     0   0     0     0     0     0     0     0     0     0 0 0     0 0       0     19,990    
Available-for-sale Securities, Portfolio Concentration Not Rated, Fair Value 23,521   23,521       0     0     0   0     0     0     0     0     0     0     0     0 0 0     0 0       0     23,521    
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 derived from the FHFA1, appreciating 5% over the next 12 months, then flat for the following 12 months and then appreciating at 2% per year thereafter. Starting with current depreciated housing prices based on information derived from the FHFA1, depreciating 2% over the next 12 months, then flat for the following 12 months and then appreciating at 2% per year thereafter. Starting with current depreciated housing prices based on information derived from the FHFA1, depreciating 6% over the next 12 months and then appreciating 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.                                
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 16 16     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                                                                       1     47 1 16     0 31                  
Amount of Credit Losses Recognized in Current Period                                                                       $ 552     $ 72,438 $ 552 $ 48,986     $ 0 $ 23,452                  
[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] Calculated on a taxable equivalent basis using a 39% effective tax rate.
[4] 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.
[5] 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.
[6] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[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 12,804 593 — — 12,804 593Alt-A loans 16 — — 118,414 15,852 118,414 15,852Jumbo-A loans 27 — — 162,754 20,245 162,754 20,245
[9] 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.