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Note 3 - Securities (Details) - Securities in a Continuous Loss Position - USD ($)
Dec. 31, 2015
Dec. 31, 2014
2015    
Securities available for sale, continuous unrealized loss position, less than 12 months $ 21,452,000 $ 190,579,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 78,000 740,000
Securities available for sale, continuous unrealized loss position, 12 months or more 142,424,000 74,120,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,991,000 2,836,000
Securities available for sale, continuous unrealized loss position 163,876,000 264,699,000
Securities available for sale, continuous unrealized loss position, unrealized loss 2,069,000 3,576,000
US Government Agencies Debt Securities [Member]    
2015    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 81,891,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 202,000
Securities available for sale, continuous unrealized loss position, 12 months or more 76,496,000 74,120,000
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 1,552,000 2,836,000
Securities available for sale, continuous unrealized loss position 76,496,000 156,011,000
Securities available for sale, continuous unrealized loss position, unrealized loss 1,552,000 3,038,000
Collateralized Mortgage Backed Securities [Member]    
2015    
Securities available for sale, continuous unrealized loss position, less than 12 months 18,025,000 49,940,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 69,000 218,000
Securities available for sale, continuous unrealized loss position, 12 months or more 34,660,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 235,000 0
Securities available for sale, continuous unrealized loss position 52,685,000 49,940,000
Securities available for sale, continuous unrealized loss position, unrealized loss 304,000 218,000
Municipal General Obligation Bonds [Member]    
2015    
Securities available for sale, continuous unrealized loss position, less than 12 months 1,981,000 54,104,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 4,000 307,000
Securities available for sale, continuous unrealized loss position, 12 months or more 30,134,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 201,000 0
Securities available for sale, continuous unrealized loss position 32,115,000 54,104,000
Securities available for sale, continuous unrealized loss position, unrealized loss 205,000 307,000
Municipal Revenue Bonds [Member]    
2015    
Securities available for sale, continuous unrealized loss position, less than 12 months 0 4,644,000
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 0 13,000
Securities available for sale, continuous unrealized loss position, 12 months or more 1,134,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 3,000 0
Securities available for sale, continuous unrealized loss position 1,134,000 4,644,000
Securities available for sale, continuous unrealized loss position, unrealized loss 3,000 13,000
Other Debt Obligations [Member]    
2015    
Securities available for sale, continuous unrealized loss position, less than 12 months 1,446,000 0
Securities available for sale, continuous unrealized loss position, less than 12 months, unrealized loss 5,000 0
Securities available for sale, continuous unrealized loss position, 12 months or more 0 0
Securities available for sale, continuous unrealized loss position, 12 months or more, unrealized loss 0 0
Securities available for sale, continuous unrealized loss position 1,446,000 0
Securities available for sale, continuous unrealized loss position, unrealized loss $ 5,000 $ 0