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Note 3 - Investment Securities (Detail) - Amortized cost, unrealized gains and losses, and estimated market value of held to maturity investment securities portfolio (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amortized Cost $ 1,156,041 $ 922,803
Gross Unrealized Gains 30,322 27,894
Gross Unrealized Losses (1,806) (3,204)
Estimated Market Value 1,184,557 947,493
US Government-sponsored Enterprises Debt Securities [Member]
   
Amortized Cost 3,232  
Gross Unrealized Gains 43  
Estimated Market Value 3,275  
Residential Mortgage Backed Securities [Member]
   
Amortized Cost 72,807 54,869
Gross Unrealized Gains 2,090 1,532
Gross Unrealized Losses (10) (77)
Estimated Market Value 74,887 56,324
US States and Political Subdivisions Debt Securities [Member]
   
Amortized Cost 680,802 625,390
Gross Unrealized Gains 23,004 23,581
Gross Unrealized Losses (1,235) (496)
Estimated Market Value 702,571 648,475
Residential Collateralized Mortgage Obligations [Member]
   
Amortized Cost 399,200 242,544
Gross Unrealized Gains 5,185 2,781
Gross Unrealized Losses (561) (2,631)
Estimated Market Value $ 403,824 $ 242,694