Annual report pursuant to Section 13 and 15(d)

Held-to-Maturity Securities (Details)

v2.4.0.6
Held-to-Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total $ 1,743,876 $ 640,551
Held-to-maturity Securities, Fair Value 1,794,105 660,186
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 1,743,876 640,551
Held-to-maturity Securities, Gross Gain 50,391 19,652
Held-to-maturity Securities, Gross Losses (162) (17)
Held-to-maturity securities, fair value 1,794,105 660,186
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 0
Held-to-maturity Securities, Over 10 years 1,624,483 640,551
Held-to-maturity securities, Total 1,649,384 640,551
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 24,739 0
Fair Value, Over 10 years 1,672,702 660,186
Held-to-maturity Securities, Fair Value 1,697,441 660,186
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 1,649,384 640,551
Held-to-maturity Securities, Gross Gain 48,219 19,652
Held-to-maturity Securities, Gross Losses (162) (17)
Held-to-maturity securities, fair value 1,697,441 660,186
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 15,108 0
Held-to-maturity Securities, Over 10 years 69,399 0
Held-to-maturity securities, Total 84,507 0
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 15,338 0
Fair Value, Over 10 years 71,341 0
Held-to-maturity Securities, Fair Value 86,679 0
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 84,507 0
Held-to-maturity Securities, Gross Gain 2,172 0
Held-to-maturity Securities, Gross Losses 0 0
Held-to-maturity securities, fair value 86,679 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 9,985 0
Held-to-maturity securities, Total 9,985 0
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 9,985 0
Held-to-maturity Securities, Fair Value 9,985 0
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 9,985 0
Held-to-maturity Securities, Gross Gain 0 0
Held-to-maturity Securities, Gross Losses 0 0
Held-to-maturity securities, fair value 9,985 0
Total U.S. Government backed agencies [Member]
    
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total 1,733,891 640,551
Held-to-maturity Securities, Fair Value 1,784,120 660,186
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 1,733,891 640,551
Held-to-maturity Securities, Gross Gain 50,391 19,652
Held-to-maturity Securities, Gross Losses (162) (17)
Held-to-maturity securities, fair value $ 1,784,120 $ 660,186