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Note 3 - Investment Securities (Detail) - Amortized cost, unrealized gains and losses, and fair value - held to maturity investment securities portfolio (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Amortized Cost $ 1,162,358 $ 1,156,041
Gross Unrealized Gains 26,581 30,322
Gross Unrealized Losses (3,298) (1,806)
Fair Value 1,185,641 1,184,557
US Government-sponsored Enterprises Debt Securities [Member]
   
Amortized Cost 2,747 3,232
Gross Unrealized Gains 28 43
Fair Value 2,775 3,275
Residential Mortgage Backed Securities [Member]
   
Amortized Cost 68,417 72,807
Gross Unrealized Gains 1,774 2,090
Gross Unrealized Losses (14) (10)
Fair Value 70,177 74,887
US States and Political Subdivisions Debt Securities [Member]
   
Amortized Cost 720,514 680,802
Gross Unrealized Gains 18,378 23,004
Gross Unrealized Losses (2,913) (1,235)
Fair Value 735,979 702,571
Residential Collateralized Mortgage Obligations [Member]
   
Amortized Cost 370,680 399,200
Gross Unrealized Gains 6,401 5,185
Gross Unrealized Losses (371) (561)
Fair Value $ 376,710 $ 403,824