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Note 3 - Securities (Detail) - Securities Portfolio (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value $ 1,174,931 $ 1,013,006
Municipal securities 60,933 60,458
Municipal securities 4,714 1,019
Municipal securities 65,647 61,477
Trading Securities (1) 15,314 [1] 14,469 [1]
US Government Corporations and Agencies Securities [Member]
   
Amortized Cost 2,011 5,060
Gross Unrealized Losses (5) (25)
Fair Value 2,006 5,035
Collateralized Residential Mortgage Obligations [Member]
   
Amortized Cost 486,449 383,828
Gross Unrealized Gains 3,912 2,622
Gross Unrealized Losses (1,314) (2,346)
Fair Value 489,047 384,104
Other Residential Mortgage-Backed Securities [Member]
   
Amortized Cost 130,032 81,982
Gross Unrealized Gains 5,927 5,732
Gross Unrealized Losses (32) (23)
Fair Value 135,927 87,691
State and Municipal [Member]
   
Amortized Cost 478,970 464,282
Gross Unrealized Gains 25,944 26,155
Gross Unrealized Losses (221) (366)
Fair Value 504,693 490,071
Collateralized Debt Obligations [Member]
   
Amortized Cost 46,633 48,759
Gross Unrealized Losses (35,551) (35,365)
Fair Value 11,082 13,394
Corporate Debt [Member]
   
Amortized Cost 19,693 27,511
Gross Unrealized Gains 2,008 2,514
Gross Unrealized Losses   (11)
Fair Value 21,701 30,014
Hedge Fund Investment [Member]
   
Amortized Cost 1,230 1,231
Gross Unrealized Gains 803 385
Fair Value 2,033 1,616
Other Equity Securities [Member]
   
Amortized Cost 8,236 958
Gross Unrealized Gains 206 123
Fair Value 8,442 1,081
Total Equity Securities [Member]
   
Amortized Cost 9,466 2,189
Gross Unrealized Gains 1,009 508
Fair Value 10,475 2,697
Total [Member]
   
Amortized Cost 1,173,254 1,013,611
Gross Unrealized Gains 38,800 37,531
Gross Unrealized Losses (37,123) (38,136)
Fair Value $ 1,174,931 $ 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.