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Available-for-Sale and Held-to-Maturity Securities (Schedule of Amortized Cost and Fair Values of the Available for Sale Securities and Held to Maturity Securities) (Details) (USD $)
In Thousands
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Available-for-sale Securities, Amortized cost  $ 1,005,657
Available-for-sale Securities, Gross unrealized gains  12,061[1]
Available-for-sale Securities, Gross unrealized losses  (5,004)[1]
Available-for-sale securities, Estimated fair value  1,012,714
Held-to-maturity Securities, Amortized cost159,132159,13252,640
Held-to-maturity Securities, Gross unrealized gains 3,744[1]4,001[1]
Held-to-maturity Securities, Gross unrealized losses (5,791)[1](3,657)[1]
Held-to-maturity securities, Estimated fair value 157,08552,984
U.S. Government Securities [Member]
   
Available-for-sale Securities, Amortized cost  24,972
Available-for-sale Securities, Gross unrealized gains  58[1]
Available-for-sale Securities, Gross unrealized losses  0[1]
Available-for-sale securities, Estimated fair value  25,030
State and Municipal Securities [Member]
   
Available-for-sale Securities, Amortized cost79,714 26,678
Available-for-sale Securities, Gross unrealized gains4,490[1] 727[1]
Available-for-sale Securities, Gross unrealized losses(192)[1] (1,062)[1]
Available-for-sale securities, Estimated fair value84,012 26,343
Agency [Member]
   
Available-for-sale Securities, Amortized cost495,524 692,922
Available-for-sale Securities, Gross unrealized gains12,021[1] 6,938[1]
Available-for-sale Securities, Gross unrealized losses(778)[1] (2,697)[1]
Available-for-sale securities, Estimated fair value506,767 697,163
Commercial [Member]
   
Available-for-sale Securities, Amortized cost266,643 66,912
Available-for-sale Securities, Gross unrealized gains1,102[1] 1,212[1]
Available-for-sale Securities, Gross unrealized losses(1,820)[1] (128)[1]
Available-for-sale securities, Estimated fair value265,925 67,996
Non-Agency [Member]
   
Available-for-sale Securities, Amortized cost19,125 29,319
Available-for-sale Securities, Gross unrealized gains117[1] 744[1]
Available-for-sale Securities, Gross unrealized losses(985)[1] (790)[1]
Available-for-sale securities, Estimated fair value18,257 29,273
Corporate Fixed Income Securities [Member]
   
Available-for-sale Securities, Amortized cost412,433 153,523
Available-for-sale Securities, Gross unrealized gains1,834[1] 1,705[1]
Available-for-sale Securities, Gross unrealized losses(4,450)[1] (327)[1]
Available-for-sale securities, Estimated fair value409,817 154,901
Held-to-maturity Securities, Amortized cost 55,569[2] 
Held-to-maturity Securities, Gross unrealized gains 55[1],[2] 
Held-to-maturity Securities, Gross unrealized losses (2,206)[1],[2] 
Held-to-maturity securities, Estimated fair value 53,418[2] 
Asset-backed Securities [Member]
   
Available-for-sale Securities, Amortized cost26,677 11,331
Available-for-sale Securities, Gross unrealized gains553[1] 677[1]
Available-for-sale Securities, Gross unrealized losses(128)[1] 0[1]
Available-for-sale securities, Estimated fair value27,102 12,008
Held-to-maturity Securities, Amortized cost 82,224[2]8,921[2]
Held-to-maturity Securities, Gross unrealized gains 2,734[1],[2]198[1],[2]
Held-to-maturity Securities, Gross unrealized losses (3,235)[1],[2](3,486)[1],[2]
Held-to-maturity securities, Estimated fair value 81,723[2]5,633[2]
Municipal Auction Rate Securities [Member]
   
Held-to-maturity Securities, Amortized cost 21,339[2]43,719[2]
Held-to-maturity Securities, Gross unrealized gains 955[1],[2]3,803[1],[2]
Held-to-maturity Securities, Gross unrealized losses 350[1],[2](171)[1],[2]
Held-to-maturity securities, Estimated fair value $ 21,944[2]$ 47,351[2]
[1]Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income/(loss).
[2]Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.