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Note 3 - Securities (Details) - Available-for-sale Securities (USD $)
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost $ 457,458,000 $ 139,487,000
Securities available for sale, gross unrealized gains 3,021,000 1,791,000
Securities available for sale, gross unrealized losses (6,470,000) (10,100,000)
Securities available for sale 454,009,000 [1] 131,178,000 [1]
US Government Agencies Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost 209,371,000 108,279,000
Securities available for sale, gross unrealized gains 823,000 263,000
Securities available for sale, gross unrealized losses (5,717,000) (10,065,000)
Securities available for sale 204,477,000 98,477,000
Collateralized Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost 99,574,000 12,456,000
Securities available for sale, gross unrealized gains 1,083,000 1,102,000
Securities available for sale, gross unrealized losses (399,000) 0
Securities available for sale 100,258,000 13,558,000
Municipal General Obligation Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost 135,575,000 16,488,000
Securities available for sale, gross unrealized gains 1,003,000 388,000
Securities available for sale, gross unrealized losses (328,000) (4,000)
Securities available for sale 136,250,000 16,872,000
Municipal Revenue Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost 11,022,000 878,000
Securities available for sale, gross unrealized gains 112,000 38,000
Securities available for sale, gross unrealized losses (17,000) 0
Securities available for sale 11,117,000 916,000
Other Debt Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost 1,916,000  
Securities available for sale, gross unrealized gains 0  
Securities available for sale, gross unrealized losses (9,000)  
Securities available for sale 1,907,000  
Mutual Funds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, amortized cost   1,386,000
Securities available for sale, gross unrealized gains   0
Securities available for sale, gross unrealized losses   (31,000)
Securities available for sale   $ 1,355,000
[1] See Note 12 for a description of the fair value hierarchy as well as a disclosure of levels for classes of financial assets and liabilities.