Quarterly report pursuant to Section 13 or 15(d)

Held-to-Maturity Securities (Details)

v2.4.0.6
Held-to-Maturity Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total $ 1,693,074 $ 1,743,876
Held-to-maturity Securities, Fair Value 1,733,454 1,794,105
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 1,693,074 1,743,876
Held-to-maturity Securities, Gross Gain 40,849 50,391
Held-to-maturity Securities, Gross Losses (469) (162)
Held-to-maturity securities, fair value 1,733,454 1,794,105
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 1,575,139 1,624,483
Held-to-maturity securities, Total 1,600,040 1,649,384
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 24,460 24,739
Fair Value, Over 10 years 1,614,685 1,672,702
Held-to-maturity Securities, Fair Value 1,639,145 1,697,441
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 1,600,040 1,649,384
Held-to-maturity Securities, Gross Gain 39,574 48,219
Held-to-maturity Securities, Gross Losses (469) (162)
Held-to-maturity securities, fair value 1,639,145 1,697,441
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 15,106 15,108
Held-to-maturity Securities, Over 10 years 68,118 69,399
Held-to-maturity securities, Total 83,224 84,507
Fair Value, Under 1 year 0 0
Fair Value, 1-5 years 0 0
Fair Value, 6-10 years 15,418 15,338
Fair Value, Over 10 years 69,079 71,341
Held-to-maturity Securities, Fair Value 84,497 86,679
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 83,224 84,507
Held-to-maturity Securities, Gross Gain 1,273 2,172
Held-to-maturity Securities, Gross Losses 0 0
Held-to-maturity securities, fair value 84,497 86,679
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 9,810 9,985
Held-to-maturity securities, Total 9,810 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 9,812 9,985
Held-to-maturity Securities, Fair Value 9,812 9,985
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 9,810 9,985
Held-to-maturity Securities, Gross Gain 2 0
Held-to-maturity Securities, Gross Losses 0 0
Held-to-maturity securities, fair value 9,812 9,985
Total U.S. Government backed agencies [Member]
    
Contractual maturities of held-to-maturity securities    
Held-to-maturity securities, Total 1,683,264 1,733,891
Held-to-maturity Securities, Fair Value 1,723,642 1,784,120
Amortized cost, gross unrealized gains and losses, and fair value by investment category    
Held-to-maturity securities, Total 1,683,264 1,733,891
Held-to-maturity Securities, Gross Gain 40,847 50,391
Held-to-maturity Securities, Gross Losses (469) (162)
Held-to-maturity securities, fair value $ 1,723,642 $ 1,784,120