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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
Mar. 31, 2013
Dec. 31, 2012
Available-for-sale Securities, Amortized cost $ 1,713,187 $ 1,601,102
Available-for-sale Securities, Gross unrealized gains 22,553 [1] 27,460 [1]
Available-for-sale Securities, Gross unrealized losses (5,903) [1] (3,394) [1]
Available-for-sale securities, Estimated fair value 1,729,837 1,625,168
Held-to-maturity Securities, Amortized cost 716,273 [2] 708,008 [2]
Held-to-maturity Securities, Gross unrealized gains 12,074 [1],[2] 10,776 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (2,504) [1],[2] (3,510) [1],[2]
Held-to-maturity securities, Estimated fair value 725,843 [2] 715,274 [2]
U.S. Government Agency Securities [Member]
   
Available-for-sale Securities, Amortized cost 1,217 1,114
Available-for-sale Securities, Gross unrealized gains 1 [1] 1 [1]
Available-for-sale Securities, Gross unrealized losses (1) [1] (2) [1]
Available-for-sale securities, Estimated fair value 1,217 1,113
State And Municipal Securities [Member]
   
Available-for-sale Securities, Amortized cost 185,400 153,885
Available-for-sale Securities, Gross unrealized gains 4,015 [1] 4,648 [1]
Available-for-sale Securities, Gross unrealized losses (2,638) [1] (1,113) [1]
Available-for-sale securities, Estimated fair value 186,777 157,420
Agency [Member]
   
Available-for-sale Securities, Amortized cost 723,399 676,861
Available-for-sale Securities, Gross unrealized gains 5,833 [1] 8,140 [1]
Available-for-sale Securities, Gross unrealized losses (2,436) [1] (153) [1]
Available-for-sale securities, Estimated fair value 726,796 684,848
Commercial [Member]
   
Available-for-sale Securities, Amortized cost 243,192 255,255
Available-for-sale Securities, Gross unrealized gains 4,817 [1] 5,902 [1]
Available-for-sale Securities, Gross unrealized losses (29) [1] (183) [1]
Available-for-sale securities, Estimated fair value 247,980 260,974
Non-Agency [Member]
   
Available-for-sale Securities, Amortized cost 6,158 13,077
Available-for-sale Securities, Gross unrealized gains 136 [1] 801 [1]
Available-for-sale Securities, Gross unrealized losses    [1]  
Available-for-sale securities, Estimated fair value 6,294 13,878
Corporate Fixed Income Securities [Member]
   
Available-for-sale Securities, Amortized cost 493,887 474,338
Available-for-sale Securities, Gross unrealized gains 7,453 [1] 7,590 [1]
Available-for-sale Securities, Gross unrealized losses (731) [1] (1,746) [1]
Available-for-sale securities, Estimated fair value 500,609 480,182
Held-to-maturity Securities, Amortized cost 55,398 [2] 55,420 [2]
Held-to-maturity Securities, Gross unrealized gains 177 [1],[2] 36 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (295) [1],[2] (519) [1],[2]
Held-to-maturity securities, Estimated fair value 55,280 [2] 54,937 [2]
Asset-Backed Securities [Member]
   
Available-for-sale Securities, Amortized cost 59,934 26,572
Available-for-sale Securities, Gross unrealized gains 298 [1] 378 [1]
Available-for-sale Securities, Gross unrealized losses (68) [1] (197) [1]
Available-for-sale securities, Estimated fair value 60,164 26,753
Held-to-maturity Securities, Amortized cost 638,673 [2] 630,279 [2]
Held-to-maturity Securities, Gross unrealized gains 10,504 [1],[2] 9,364 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (2,191) [1],[2] (2,971) [1],[2]
Held-to-maturity securities, Estimated fair value 646,986 [2] 636,672 [2]
Municipal Auction Rate Securities [Member]
   
Held-to-maturity Securities, Amortized cost 22,202 [2] 22,309 [2]
Held-to-maturity Securities, Gross unrealized gains 1,393 [1],[2] 1,376 [1],[2]
Held-to-maturity Securities, Gross unrealized losses (18) [1],[2] (20) [1],[2]
Held-to-maturity securities, Estimated fair value $ 23,577 [2] $ 23,665 [2]
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.
[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.