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Note 3 - Securities (Tables)
9 Months Ended
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
   

 

    Gross     Gross        
   

Amortized

   

Unrealized

   

Unrealized

    Fair  
   

Cost

   

Gains

   

Losses

    Value  

September 30, 2014

                               

U.S. Government agency debt obligations

  $ 209,371,000     $ 823,000     $ (5,717,000 )   $ 204,477,000  

Mortgage-backed securities

    99,574,000       1,083,000       (399,000 )     100,258,000  

Municipal general obligation bonds

    135,575,000       1,003,000       (328,000 )     136,250,000  

Municipal revenue bonds

    11,022,000       112,000       (17,000 )     11,117,000  

Other Investments

    1,916,000       0       (9,000 )     1,907,000  
                                 
    $ 457,458,000     $ 3,021,000     $ (6,470,000 )   $ 454,009,000  
                                 

December 31, 2013

                               

U.S. Government agency debt obligations

  $ 108,279,000     $ 263,000     $ (10,065,000 )   $ 98,477,000  

Mortgage-backed securities

    12,456,000       1,102,000       0       13,558,000  

Municipal general obligation bonds

    16,488,000       388,000       (4,000 )     16,872,000  

Municipal revenue bonds

    878,000       38,000       0       916,000  

Mutual funds

    1,386,000       0       (31,000 )     1,355,000  
                                 
    $ 139,487,000     $ 1,791,000     $ (10,100,000 )   $ 131,178,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
   

Less than 12 Months

    12 Months or More     Total  
    Fair     Unrealized    

Fair

    Unrealized     Fair     Unrealized  
    Value     Loss     Value     Loss    

Value

    Loss  
                                                 

September 30, 2014

                                               

U.S. Government agency debt obligations

  $ 83,379,000     $ (436,000 )   $ 71,673,000     $ (5,281,000 )   $ 155,052,000     $ (5,717,000 )

Mortgage-backed securities

    72,205,000       (399,000 )     0       0       72,205,000       (399,000 )

Municipal general obligation bonds

    24,844,000       (328,000 )     0       0       24,844,000       (328,000 )

Municipal revenue bonds

    5,438,000       (17,000 )     0       0       5,438,000       (17,000 )

Other investments

    0       0       1,399,000       (9,000 )     1,399,000       (9,000 )
                                                 
    $ 185,866,000     $ (1,180,000 )   $ 73,072,000     $ (5,290,000 )   $ 258,938,000     $ (6,470,000 )
                                                 
                                                 

December 31, 2013

                                               

U.S. Government agency debt obligations

  $ 57,117,000     $ (5,798,000 )   $ 29,679,000     $ (4,267,000 )   $ 86,796,000     $ (10,065,000 )

Mortgage-backed securities

    0       0       0       0       0       0  

Municipal general obligation bonds

    295,000       (4,000 )     0       0       295,000       (4,000 )

Municipal revenue bonds

    0       0       0       0       0       0  

Mutual funds

    1,355,000       (31,000 )     0       0       1,355,000       (31,000 )
                                                 
    $ 58,767,000     $ (5,833,000 )   $ 29,679,000     $ (4,267,000 )   $ 88,446,000     $ (10,100,000 )
Investments Classified by Contractual Maturity Date [Table Text Block]
   

Weighted

                 
    Average     Amortized     Fair  
    Yield     Cost     Value  
                         

Due in 2014

    1.01%     $ 11,072,000     $ 11,082,000  

Due in 2015 through 2019

    1.26       182,997,000       182,029,000  

Due in 2020 through 2024

    3.01       71,801,000       71,698,000  

Due in 2025 and beyond

    3.63       90,098,000       87,035,000  

Mortgage-backed securities

    1.61       99,574,000       100,258,000  

Other investments

    1.55       1,916,000       1,907,000  
                         
      2.08%     $ 457,458,000     $ 454,009,000