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Note 3 - Securities (Detail) - Securities Portfolio (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value $ 1,191,582 $ 1,013,006
Municipal securities 41,944 60,458
Municipal securities 3,689 1,019
Municipal securities 45,633 61,477
Trading Securities (1) 15,512 [1] 14,469 [1]
US Government Corporations and Agencies Securities [Member]
   
Amortized Cost 2,003 5,060
Gross Unrealized Losses (1) (25)
Fair Value 2,002 5,035
Collateralized Residential Mortgage Obligations [Member]
   
Amortized Cost 511,242 383,828
Gross Unrealized Gains 4,054 2,622
Gross Unrealized Losses (1,864) (2,346)
Fair Value 513,432 384,104
Other Residential Mortgage-Backed Securities [Member]
   
Amortized Cost 128,750 81,982
Gross Unrealized Gains 6,399 5,732
Gross Unrealized Losses (14) (23)
Fair Value 135,135 87,691
State and Municipal [Member]
   
Amortized Cost 474,461 464,282
Gross Unrealized Gains 28,901 26,155
Gross Unrealized Losses (47) (366)
Fair Value 503,315 490,071
Collateralized Debt Obligations [Member]
   
Amortized Cost 46,633 48,759
Gross Unrealized Losses (35,087) (35,365)
Fair Value 11,546 13,394
Corporate Debt [Member]
   
Amortized Cost 13,008 27,511
Gross Unrealized Gains 2,304 2,514
Gross Unrealized Losses   (11)
Fair Value 15,312 30,014
Hedge Fund Investment [Member]
   
Amortized Cost 1,230 1,231
Gross Unrealized Gains 984 385
Fair Value 2,214 1,616
Other Equity Securities [Member]
   
Amortized Cost 8,296 958
Gross Unrealized Gains 330 123
Fair Value 8,626 1,081
Total Equity Securities [Member]
   
Amortized Cost 9,526 2,189
Gross Unrealized Gains 1,314 508
Fair Value 10,840 2,697
Total [Member]
   
Amortized Cost 1,185,623 1,013,611
Gross Unrealized Gains 42,972 37,531
Gross Unrealized Losses (37,013) (38,136)
Fair Value $ 1,191,582 $ 1,013,006
[1] Trading securities held by the Company represent diversified investment securities held in a grantor trust under deferred compensation arrangements in which plan participants may direct amounts earned to be invested in securities other than Company stock.