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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, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available-for-sale Securities, Amortized cost $ 1,312,350 $ 1,204,205
Available-for-sale Securities, Gross unrealized gains 21,821 [1] 18,050 [1]
Available-for-sale Securities, Gross unrealized losses (4,812) [1] (8,114) [1]
Available-for-sale securities, Estimated fair value 1,329,359 1,214,141
Held-to-maturity Securities, Amortized cost 521,378 [2] 190,484 [2]
Held-to-maturity Securities, Gross unrealized gains 8,953 [1],[2] 3,742 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (5,123) [1],[2] (5,155) [1],[2]
Held-to-maturity securities, Estimated fair value 525,208 [2] 189,071 [2]
U.S. Government Agency Securities [Member]
   
Available-for-sale Securities, Amortized cost 1,116 1,105
Available-for-sale Securities, Gross unrealized gains    [1]  
Available-for-sale Securities, Gross unrealized losses (1) [1] (2) [1]
Available-for-sale securities, Estimated fair value 1,115 1,103
State And Municipal Securities [Member]
   
Available-for-sale Securities, Amortized cost 114,276 82,256
Available-for-sale Securities, Gross unrealized gains 5,926 [1] 4,979 [1]
Available-for-sale Securities, Gross unrealized losses (599) [1] (303) [1]
Available-for-sale securities, Estimated fair value 119,603 86,932
Agency [Member]
   
Available-for-sale Securities, Amortized cost 403,553 396,952
Available-for-sale Securities, Gross unrealized gains 7,724 [1] 8,469 [1]
Available-for-sale Securities, Gross unrealized losses    [1] (759) [1]
Available-for-sale securities, Estimated fair value 411,277 404,662
Commercial [Member]
   
Available-for-sale Securities, Amortized cost 281,191 270,677
Available-for-sale Securities, Gross unrealized gains 3,633 [1] 1,811 [1]
Available-for-sale Securities, Gross unrealized losses (999) [1] (978) [1]
Available-for-sale securities, Estimated fair value 283,825 271,510
Non-Agency [Member]
   
Available-for-sale Securities, Amortized cost 15,152 17,701
Available-for-sale Securities, Gross unrealized gains 256 [1] 135 [1]
Available-for-sale Securities, Gross unrealized losses    [1] (376) [1]
Available-for-sale securities, Estimated fair value 15,408 17,460
Corporate Fixed Income Securities [Member]
   
Available-for-sale Securities, Amortized cost 469,917 409,503
Available-for-sale Securities, Gross unrealized gains 3,805 [1] 2,108 [1]
Available-for-sale Securities, Gross unrealized losses (2,741) [1] (5,626) [1]
Available-for-sale securities, Estimated fair value 470,981 405,985
Held-to-maturity Securities, Amortized cost 55,495 [2] 55,544 [2]
Held-to-maturity Securities, Gross unrealized gains 58 [1],[2] 56 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (1,808) [1],[2] (2,016) [1],[2]
Held-to-maturity securities, Estimated fair value 53,745 [2] 53,584 [2]
Asset-Backed Securities [Member]
   
Available-for-sale Securities, Amortized cost 27,145 26,011
Available-for-sale Securities, Gross unrealized gains 477 [1] 548 [1]
Available-for-sale Securities, Gross unrealized losses (472) [1] (70) [1]
Available-for-sale securities, Estimated fair value 27,150 26,489
Held-to-maturity Securities, Amortized cost 443,495 [2] 122,148 [2]
Held-to-maturity Securities, Gross unrealized gains 7,395 [1],[2] 2,953 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (3,298) [1],[2] (3,138) [1],[2]
Held-to-maturity securities, Estimated fair value 447,592 [2] 121,963 [2]
Municipal Auction Rate Securities [Member]
   
Held-to-maturity Securities, Amortized cost 22,388 [2] 12,792 [2]
Held-to-maturity Securities, Gross unrealized gains 1,500 [1],[2] 733 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (17) [1],[2] (1) [1],[2]
Held-to-maturity securities, Estimated fair value $ 23,871 [2] $ 13,524 [2]
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive 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.