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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities-held to maturity $ 2 $ 2
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 0 0
Securities held to maturity, fair value 2 2
Securities available for sale, amortized cost 277,575 259,456
Securities available for sale, gross unrealized gains 1,716 913
Securities available for sale, gross unrealized losses 2,129 4,525
Securities available for sale, at fair value 277,162 255,844
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities-held to maturity 2 2
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 0 0
Securities held to maturity, fair value 2 2
Securities available for sale, amortized cost 120,676 110,493
Securities available for sale, gross unrealized gains 54 93
Securities available for sale, gross unrealized losses 1,233 2,349
Securities available for sale, at fair value 119,497 108,237
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 14,623 16,293
Securities available for sale, gross unrealized gains 7 23
Securities available for sale, gross unrealized losses 177 288
Securities available for sale, at fair value 14,453 16,028
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 71,457 69,407
Securities available for sale, gross unrealized gains 3 14
Securities available for sale, gross unrealized losses 437 759
Securities available for sale, at fair value 71,023 68,662
Municipal Notes [Member]    
Securities available for sale, amortized cost 70,395 63,189
Securities available for sale, gross unrealized gains 1,652 783
Securities available for sale, gross unrealized losses 282 1,129
Securities available for sale, at fair value 71,765 62,843
Debt Securities [Member]    
Securities-held to maturity 2  
Securities held to maturity, fair value 2  
Securities available for sale, amortized cost 277,151 259,382
Securities available for sale, gross unrealized gains 1,716 913
Securities available for sale, gross unrealized losses 2,129 4,525
Securities available for sale, at fair value 276,738 255,770
Mutual Funds [Member]    
Securities available for sale, amortized cost 424 74
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 0 0
Securities available for sale, at fair value $ 424 $ 74