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Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 220 59
Securities in an unrealized loss position less than 12 months fair value $ 215,321 $ 52,886
Securities in an unrealized loss position less than 12 months unrealized losses 6,016 343
Securities in an unrealized loss position 12 months or longer fair value 3,348 1,881
Securities in an unrealized loss position 12 months or longer unrealized losses 1,557 1,650
Securities in an unrealized loss position fair value 218,669 54,767
Securities in an unrealized loss position unrealized losses 7,573 1,993
US Government Agencies Debt Securities [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 43 4
Securities in an unrealized loss position less than 12 months fair value 53,172 3,992
Securities in an unrealized loss position less than 12 months unrealized losses 1,455 19
Securities in an unrealized loss position 12 months or longer fair value 0 0
Securities in an unrealized loss position 12 months or longer unrealized losses 0 0
Securities in an unrealized loss position fair value 53,172 3,992
Securities in an unrealized loss position unrealized losses 1,455 19
State and Municipal [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 73 15
Securities in an unrealized loss position less than 12 months fair value 32,706 6,472
Securities in an unrealized loss position less than 12 months unrealized losses 1,331 91
Securities in an unrealized loss position 12 months or longer fair value   0
Securities in an unrealized loss position 12 months or longer unrealized losses   0
Securities in an unrealized loss position fair value 32,706 6,472
Securities in an unrealized loss position unrealized losses 1,331 91
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 45 9
Securities in an unrealized loss position less than 12 months fair value 68,335 13,439
Securities in an unrealized loss position less than 12 months unrealized losses 1,694 33
Securities in an unrealized loss position 12 months or longer fair value 0 0
Securities in an unrealized loss position 12 months or longer unrealized losses 0 0
Securities in an unrealized loss position fair value 68,335 13,439
Securities in an unrealized loss position unrealized losses 1,694 33
Collateralized Mortgage Obligations [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 45 19
Securities in an unrealized loss position less than 12 months fair value 57,461 28,396
Securities in an unrealized loss position less than 12 months unrealized losses 1,458 155
Securities in an unrealized loss position 12 months or longer fair value 1,507 0
Securities in an unrealized loss position 12 months or longer unrealized losses 25 0
Securities in an unrealized loss position fair value 58,968 28,396
Securities in an unrealized loss position unrealized losses 1,483 155
Pooled Trust Preferred Securities [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 5 5
Securities in an unrealized loss position less than 12 months fair value 0 0
Securities in an unrealized loss position less than 12 months unrealized losses 0 0
Securities in an unrealized loss position 12 months or longer fair value 1,708 1,609
Securities in an unrealized loss position 12 months or longer unrealized losses 1,509 1,608
Securities in an unrealized loss position fair value 1,708 1,609
Securities in an unrealized loss position unrealized losses 1,509 1,608
Corporate Debt Securities [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 3  
Securities in an unrealized loss position less than 12 months fair value 2,972  
Securities in an unrealized loss position less than 12 months unrealized losses 31  
Securities in an unrealized loss position fair value 2,972  
Securities in an unrealized loss position unrealized losses 31  
Equity Securities [Member]
   
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]    
No. of securities 6 7
Securities in an unrealized loss position less than 12 months fair value 675 587
Securities in an unrealized loss position less than 12 months unrealized losses 47 45
Securities in an unrealized loss position 12 months or longer fair value 133 272
Securities in an unrealized loss position 12 months or longer unrealized losses 23 42
Securities in an unrealized loss position fair value 808 859
Securities in an unrealized loss position unrealized losses $ 70 $ 87