Quarterly report pursuant to Section 13 or 15(d)

Held-to-Maturity Securities (Details)

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Held-to-Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total $ 3,496,493 $ 3,836,667
Held-to-maturity Securities, Fair Value 3,467,056 3,760,898
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 3,496,493 3,836,667
Held-to-maturity Securities, Gross Gain (15,403) (6,349)
Held-to-maturity Securities, Gross Losses 44,840 82,118
Held-to-maturity securities, fair value 3,467,056 3,760,898
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 1,550,114 3,001,774
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (17,637) (79,766)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 740,342 22,548
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (27,203) (2,352)
Total Temporarily Impaired Securities, Fair Value 2,290,456 3,024,322
Total Temporarily Impaired Securities, Unrealized Losses (44,840) (82,118)
Federal agencies - mortgage backed securities [Member]
   
Contractual maturities of held-to-maturity securities    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 0 0
Held-to-maturity Securities, 6-10 years 24,901 24,901
Held-to-maturity Securities, Over 10 years 3,249,587 3,574,156
Held-to-maturity securities, Total 3,274,488 3,599,057
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 23,674 22,549
Fair Value, Over 10 years 3,223,650 3,506,018
Held-to-maturity Securities, Fair Value 3,247,324 3,528,567
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 3,274,488 3,599,057
Held-to-maturity Securities, Gross Gain (14,648) (5,573)
Held-to-maturity Securities, Gross Losses 41,812 76,063
Held-to-maturity securities, fair value 3,247,324 3,528,567
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 1,504,885 2,849,198
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (16,953) (73,711)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 668,968 22,548
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (24,859) (2,352)
Total Temporarily Impaired Securities, Fair Value 2,173,853 2,871,746
Total Temporarily Impaired Securities, Unrealized Losses (41,812) (76,063)
Other Federal Agencies [Member]
   
Contractual maturities of held-to-maturity securities    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 0 0
Held-to-maturity Securities, 6-10 years 54,766 38,588
Held-to-maturity Securities, Over 10 years 158,851 189,999
Held-to-maturity securities, Total 213,617 228,587
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 55,186 39,075
Fair Value, Over 10 years 156,696 185,097
Held-to-maturity Securities, Fair Value 211,882 224,172
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 213,617 228,587
Held-to-maturity Securities, Gross Gain (755) (776)
Held-to-maturity Securities, Gross Losses (2,490) (5,191)
Held-to-maturity securities, fair value 211,882 224,172
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 37,380 144,417
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (146) (5,191)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 71,374 0
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (2,344) 0
Total Temporarily Impaired Securities, Fair Value 108,754 144,417
Total Temporarily Impaired Securities, Unrealized Losses (2,490) (5,191)
Municipal securities [Member]
   
Contractual maturities of held-to-maturity securities    
Held-to-maturity Securities, Under 1 year 0 0
Held-to-maturity Securities, 1-5 years 0 0
Held-to-maturity Securities, 6-10 years 0 0
Held-to-maturity Securities, Over 10 years 8,388 9,023
Held-to-maturity securities, Total 8,388 9,023
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 0 0
Fair Value, Over 10 years 7,850 8,159
Held-to-maturity Securities, Fair Value 7,850 8,159
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 8,388 9,023
Held-to-maturity Securities, Gross Gain 0 0
Held-to-maturity Securities, Gross Losses (538) (864)
Held-to-maturity securities, fair value 7,850 8,159
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 7,849 8,159
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (538) (864)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 0 0
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months 0 0
Total Temporarily Impaired Securities, Fair Value 7,849 8,159
Total Temporarily Impaired Securities, Unrealized Losses (538) (864)
Total U.S. Government backed agencies [Member]
   
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total 3,488,105 3,827,644
Held-to-maturity Securities, Fair Value 3,459,206 3,752,739
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 3,488,105 3,827,644
Held-to-maturity Securities, Gross Gain (15,403) (6,349)
Held-to-maturity Securities, Gross Losses 44,302 81,254
Held-to-maturity securities, fair value 3,459,206 3,752,739
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 1,542,265 2,993,615
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (17,099) (78,902)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 740,342 22,548
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (27,203) (2,352)
Total Temporarily Impaired Securities, Fair Value 2,282,607 3,016,163
Total Temporarily Impaired Securities, Unrealized Losses $ (44,302) $ (81,254)