Annual report pursuant to Section 13 and 15(d)

Held-to-Maturity Securities (Details)

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Held-to-Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total $ 3,836,667 $ 1,743,876
Held-to-maturity Securities, Fair Value 3,760,898 1,794,105
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 3,836,667 1,743,876
Held-to-maturity Securities, Gross Gain (6,349) (50,391)
Held-to-maturity Securities, Gross Losses (82,118) (162)
Held-to-maturity securities, fair value 3,760,898 1,794,105
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 3,001,774 24,739
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (79,766) (162)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 22,548 0
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (2,352) 0
Total Temporarily Impaired Securities, Fair Value 3,024,322 24,739
Total Temporarily Impaired Securities, Unrealized Losses (82,118) (162)
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 3,574,156 1,624,483
Held-to-maturity securities, Total 3,599,057 1,649,384
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 22,549 24,739
Fair Value, Over 10 years 3,506,018 1,672,702
Held-to-maturity Securities, Fair Value 3,528,567 1,697,441
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 3,599,057 1,649,384
Held-to-maturity Securities, Gross Gain (5,573) (48,219)
Held-to-maturity Securities, Gross Losses (76,063) (162)
Held-to-maturity securities, fair value 3,528,567 1,697,441
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 2,849,198 24,739
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (73,711) (162)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 22,548 0
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (2,352) 0
Total Temporarily Impaired Securities, Fair Value 2,871,746 24,739
Total Temporarily Impaired Securities, Unrealized Losses (76,063) (162)
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 38,588 15,108
Held-to-maturity Securities, Over 10 years 189,999 69,399
Held-to-maturity securities, Total 228,587 84,507
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 39,075 15,338
Fair Value, Over 10 years 185,097 71,341
Held-to-maturity Securities, Fair Value 224,172 86,679
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 228,587 84,507
Held-to-maturity Securities, Gross Gain (776) (2,172)
Held-to-maturity Securities, Gross Losses (5,191) 0
Held-to-maturity securities, fair value 224,172 86,679
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 144,417 0
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (5,191) 0
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 144,417 0
Total Temporarily Impaired Securities, Unrealized Losses (5,191) 0
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 9,023 9,985
Held-to-maturity securities, Total 9,023 9,985
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 8,159 9,985
Held-to-maturity Securities, Fair Value 8,159 9,985
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 9,023 9,985
Held-to-maturity Securities, Gross Gain 0 0
Held-to-maturity Securities, Gross Losses (864) 0
Held-to-maturity securities, fair value 8,159 9,985
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 8,159 0
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (864) 0
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 8,159 0
Total Temporarily Impaired Securities, Unrealized Losses (864) 0
Total U.S. Government backed agencies [Member]
   
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total 3,827,644 1,733,891
Held-to-maturity Securities, Fair Value 3,752,739 1,784,120
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 3,827,644 1,733,891
Held-to-maturity Securities, Gross Gain (6,349) (50,391)
Held-to-maturity Securities, Gross Losses (81,254) (162)
Held-to-maturity securities, fair value 3,752,739 1,784,120
Continuous Unrealized Loss Position    
Total Temporarily Impaired Securities, Less Than Twelve Months, Fair Value 2,993,615 24,739
Total Temporarily Impaired Securities Unrealized Losses, Less Than Twelve Months, Fair Value (78,902) (162)
Total Temporarily Impaired Securities, Over Twelve Months, Fair Value 22,548 0
Total Temporarily Impaired Securites, Unrealized Losses Over Twelve Months (2,352) 0
Total Temporarily Impaired Securities, Fair Value 3,016,163 24,739
Total Temporarily Impaired Securities, Unrealized Losses $ (81,254) $ (162)