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Note 4 - Debt and Equity Securities (Detail) - Gross unrealized losses recorded in AOCI: (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value $ 1,000,294 $ 949,566
Cumulative Credit OTTI Losses 6,009 6,178
Private Issue CMO [Member] | Credit Related OTTI Charge In The Consolidated Statements Of Income [Member]
   
Amortized Cost 25,698 [1]  
Fair Value 23,762 [1]  
Gross Unrealized Losses Recorded In AOCI 1,937 [1]  
Cumulative Credit OTTI Losses 2,271 [1]  
Trust Preferred Securities [Member] | Credit Related OTTI Charge In The Consolidated Statements Of Income [Member]
   
Amortized Cost 9,262 [1]  
Fair Value 5,305 [1]  
Gross Unrealized Losses Recorded In AOCI 3,957 [1]  
Cumulative Credit OTTI Losses 3,738 [1]  
Credit Related OTTI Charge In The Consolidated Statements Of Income [Member]
   
Amortized Cost 34,960  
Fair Value 29,067  
Gross Unrealized Losses Recorded In AOCI 5,894  
Cumulative Credit OTTI Losses $ 6,009  
[1] The Company has recorded OTTI charges in the Consolidated Statements of Income on five private issue CMOs and two pooled trust preferred securities for which a portion of the OTTI is currently recorded in AOCI.