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Note 7 - Pooled Trust Preferred Securities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
PreTSL IV [Member]          
Class [1]     Mezzanine*    
Investment securities available-for-sale, amortized cost $ 243,000   $ 243,000    
Investment securities available-for-sale $ 190,000   190,000    
Unrealized gains (losses)     (53,000)    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     $ (1,000)    
Moody's/Fitch ratings     B1/BB    
Current number of performing banks 5   5    
Current number of performing insurance companies 0   0    
Actual deferrals and defaults as a % of total collateral     18.00%    
Total performing collateral as a % of outstanding bonds     141.10%    
PreTSL XVII [Member]          
Class     Mezzanine    
Investment securities available-for-sale, amortized cost $ 614,000   $ 614,000    
Investment securities available-for-sale $ 467,000   467,000    
Unrealized gains (losses)     (147,000)    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     $ (222,000)    
Moody's/Fitch ratings     C/CC    
Current number of performing banks 34   34    
Current number of performing insurance companies 5   5    
Actual deferrals and defaults as a % of total collateral     21.60%    
Total performing collateral as a % of outstanding bonds     99.30%    
PreTSL XIX [Member]          
Class     Mezzanine    
Investment securities available-for-sale, amortized cost $ 932,000   $ 932,000    
Investment securities available-for-sale $ 545,000   545,000    
Unrealized gains (losses)     (387,000)    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     $ 0    
Moody's/Fitch ratings     Caa1/CC    
Current number of performing banks 40   40    
Current number of performing insurance companies 12   12    
Actual deferrals and defaults as a % of total collateral     11.30%    
Total performing collateral as a % of outstanding bonds     97.20%    
PreTSL XXV [Member]          
Class     Mezzanine    
Investment securities available-for-sale, amortized cost $ 766,000   $ 766,000    
Investment securities available-for-sale $ 485,000   485,000    
Unrealized gains (losses)     (281,000)    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     $ (222,000)    
Moody's/Fitch ratings     Ca/C    
Current number of performing banks 45   45    
Current number of performing insurance companies 5   5    
Actual deferrals and defaults as a % of total collateral     26.80%    
Total performing collateral as a % of outstanding bonds     89.10%    
PreTSL XXVI [Member] | Security One [Member]          
Class     Mezzanine    
Investment securities available-for-sale, amortized cost $ 412,000   $ 412,000    
Investment securities available-for-sale $ 337,000   337,000    
Unrealized gains (losses)     (75,000)    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     $ (270,000)    
Moody's/Fitch ratings     Caa3/C    
Current number of performing banks 43   43    
Current number of performing insurance companies 7   7    
Actual deferrals and defaults as a % of total collateral     20.40%    
Total performing collateral as a % of outstanding bonds     96.50%    
PreTSL XXVI [Member] | Security Two [Member]          
Class     Mezzanine    
Investment securities available-for-sale, amortized cost $ 127,000   $ 127,000    
Investment securities available-for-sale $ 376,000   376,000    
Unrealized gains (losses)     249,000    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     $ (438,000)    
Moody's/Fitch ratings     Caa3/C    
Current number of performing banks 43   43    
Current number of performing insurance companies 7   7    
Actual deferrals and defaults as a % of total collateral     20.40%    
Total performing collateral as a % of outstanding bonds     96.50%    
Collateralized Debt Obligations [Member]          
Investment securities available-for-sale, amortized cost $ 3,094,000   $ 3,094,000   $ 3,291,000
Investment securities available-for-sale 2,400,000   2,400,000   2,653,000
Unrealized gains (losses)     (694,000)    
Realized OTTI credit loss     0    
Total recognized OTTI credit loss     (1,153,000)    
Investment securities available-for-sale, amortized cost 339,595,000   339,595,000   362,742,000
Investment securities available-for-sale 344,253,000   344,253,000   $ 361,915,000
Total recognized OTTI credit loss $ (122,000) $ 0 $ (192,000)  
[1] Mezzanine* - only class of bonds still outstanding (represents the senior-most obligation of the trust)