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Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Originated Loan [Member]    
With no related allowance recorded, unpaid principal balance $ 3,499,000 $ 9,259,000
With no related allowance recorded, principal balance 2,467,000 8,364,000
With no related allowance recorded, average recorded principal balance 6,583,000 7,370,000
With related allowance recorded, unpaid principal balance 11,008,000 14,870,000
With related allowance recorded, principal balance 10,916,000 9,833,000
Related allowance 1,572,000 1,474,000
With related allowance recorded, average recorded principal balance 8,869,000 22,800,000
Total unpaid principal balance 14,507,000 24,129,000
Total principal balance 13,383,000 18,197,000
Total average recorded principal balance 15,452,000 30,170,000
Originated Loan [Member] | Commercial Portfolio Segment [Member]    
With no related allowance recorded, unpaid principal balance 2,115,000 7,917,000
With no related allowance recorded, principal balance 1,723,000 7,702,000
With no related allowance recorded, average recorded principal balance 5,671,000 6,580,000
With related allowance recorded, unpaid principal balance 10,370,000 14,105,000
With related allowance recorded, principal balance 10,347,000 9,143,000
Related allowance 1,303,000 1,218,000
With related allowance recorded, average recorded principal balance 8,276,000 22,035,000
Total unpaid principal balance 12,485,000 22,022,000
Total principal balance 12,070,000 16,845,000
Total average recorded principal balance 13,947,000 28,615,000
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
With no related allowance recorded, unpaid principal balance 1,498,000 1,509,000
With no related allowance recorded, principal balance 1,498,000 1,501,000
With no related allowance recorded, average recorded principal balance 1,574,000 1,683,000
With related allowance recorded, unpaid principal balance 2,405,000 352,000
With related allowance recorded, principal balance 2,382,000 305,000
Related allowance 673,000 165,000
With related allowance recorded, average recorded principal balance 717,000 2,314,000
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
With no related allowance recorded, unpaid principal balance 487,000 0
With no related allowance recorded, principal balance 95,000 0
With no related allowance recorded, average recorded principal balance 32,000 81,000
With related allowance recorded, unpaid principal balance 999,000 2,017,000
With related allowance recorded, principal balance 999,000 1,655,000
Related allowance 28,000 245,000
With related allowance recorded, average recorded principal balance 1,011,000 1,952,000
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
With no related allowance recorded, unpaid principal balance 0 712,000
With no related allowance recorded, principal balance 0 505,000
With no related allowance recorded, average recorded principal balance 270,000 927,000
With related allowance recorded, unpaid principal balance 906,000 5,867,000
With related allowance recorded, principal balance 906,000 1,314,000
Related allowance 97,000 242,000
With related allowance recorded, average recorded principal balance 2,095,000 7,285,000
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
With no related allowance recorded, unpaid principal balance 0 5,696,000
With no related allowance recorded, principal balance 0 5,696,000
With no related allowance recorded, average recorded principal balance 3,752,000 3,703,000
With related allowance recorded, unpaid principal balance 5,020,000 4,841,000
With related allowance recorded, principal balance 5,020,000 4,841,000
Related allowance 247,000 201,000
With related allowance recorded, average recorded principal balance 3,641,000 9,265,000
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]    
With no related allowance recorded, unpaid principal balance 130,000 0
With no related allowance recorded, principal balance 130,000 0
With no related allowance recorded, average recorded principal balance 43,000 186,000
With related allowance recorded, unpaid principal balance 1,040,000 1,028,000
With related allowance recorded, principal balance 1,040,000 1,028,000
Related allowance 258,000 365,000
With related allowance recorded, average recorded principal balance 812,000 1,219,000
Originated Loan [Member] | Retail Portfolio Segment [Member]    
With no related allowance recorded, unpaid principal balance 1,384,000 1,342,000
With no related allowance recorded, principal balance 744,000 662,000
With no related allowance recorded, average recorded principal balance 912,000 790,000
With related allowance recorded, unpaid principal balance 638,000 765,000
With related allowance recorded, principal balance 569,000 690,000
Related allowance 269,000 256,000
With related allowance recorded, average recorded principal balance 593,000 765,000
Total unpaid principal balance 2,022,000 2,107,000
Total principal balance 1,313,000 1,352,000
Total average recorded principal balance 1,505,000 1,555,000
Originated Loan [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
With no related allowance recorded, unpaid principal balance 114,000 14,000
With no related allowance recorded, principal balance 114,000 5,000
With no related allowance recorded, average recorded principal balance 99,000 153,000
With related allowance recorded, unpaid principal balance 434,000 600,000
With related allowance recorded, principal balance 412,000 562,000
Related allowance 203,000 209,000
With related allowance recorded, average recorded principal balance 449,000 227,000
Originated Loan [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
With no related allowance recorded, unpaid principal balance 1,270,000 1,328,000
With no related allowance recorded, principal balance 630,000 657,000
With no related allowance recorded, average recorded principal balance 813,000 637,000
With related allowance recorded, unpaid principal balance 204,000 165,000
With related allowance recorded, principal balance 157,000 128,000
Related allowance 66,000 47,000
With related allowance recorded, average recorded principal balance 144,000 538,000
Acquired Loan [Member]    
With no related allowance recorded, unpaid principal balance 5,826,000 7,368,000
With no related allowance recorded, principal balance 4,894,000 6,588,000
With no related allowance recorded, average recorded principal balance 5,405,000 5,741,000
With related allowance recorded, unpaid principal balance 239,000 632,000
With related allowance recorded, principal balance 239,000 625,000
Related allowance 9,000 112,000
With related allowance recorded, average recorded principal balance 370,000 1,156,000
Total unpaid principal balance 6,065,000 8,000,000
Total principal balance 5,133,000 7,213,000
Total average recorded principal balance 5,775,000 6,897,000
Acquired Loan [Member] | Commercial Portfolio Segment [Member]    
With no related allowance recorded, unpaid principal balance 3,214,000 5,093,000
With no related allowance recorded, principal balance 2,914,000 4,730,000
With no related allowance recorded, average recorded principal balance 3,454,000 4,347,000
With related allowance recorded, unpaid principal balance 67,000 457,000
With related allowance recorded, principal balance 67,000 450,000
Related allowance 5,000 106,000
With related allowance recorded, average recorded principal balance 250,000 971,000
Total unpaid principal balance 3,281,000 5,550,000
Total principal balance 2,981,000 5,180,000
Total average recorded principal balance 3,704,000 5,318,000
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
With no related allowance recorded, unpaid principal balance 853,000 1,528,000
With no related allowance recorded, principal balance 826,000 1,494,000
With no related allowance recorded, average recorded principal balance 1,074,000 1,444,000
With related allowance recorded, unpaid principal balance 19,000 383,000
With related allowance recorded, principal balance 19,000 376,000
Related allowance 2,000 102,000
With related allowance recorded, average recorded principal balance 207,000 127,000
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
With no related allowance recorded, unpaid principal balance 0 0
With no related allowance recorded, principal balance 0 0
With no related allowance recorded, average recorded principal balance 0 0
With related allowance recorded, unpaid principal balance 0 0
With related allowance recorded, principal balance 0 0
Related allowance 0 0
With related allowance recorded, average recorded principal balance 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
With no related allowance recorded, unpaid principal balance 1,281,000 2,233,000
With no related allowance recorded, principal balance 1,210,000 1,952,000
With no related allowance recorded, average recorded principal balance 1,145,000 818,000
With related allowance recorded, unpaid principal balance 48,000 51,000
With related allowance recorded, principal balance 48,000 51,000
Related allowance 3,000 4,000
With related allowance recorded, average recorded principal balance 38,000 823,000
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
With no related allowance recorded, unpaid principal balance 928,000 880,000
With no related allowance recorded, principal balance 789,000 880,000
With no related allowance recorded, average recorded principal balance 932,000 565,000
With related allowance recorded, unpaid principal balance 0 0
With related allowance recorded, principal balance 0 0
Related allowance 0 0
With related allowance recorded, average recorded principal balance 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]    
With no related allowance recorded, unpaid principal balance 152,000 452,000
With no related allowance recorded, principal balance 89,000 404,000
With no related allowance recorded, average recorded principal balance 303,000 1,520,000
With related allowance recorded, unpaid principal balance 0 23,000
With related allowance recorded, principal balance 0 23,000
Related allowance 0 0
With related allowance recorded, average recorded principal balance 5,000 21,000
Acquired Loan [Member] | Retail Portfolio Segment [Member]    
With no related allowance recorded, unpaid principal balance 2,612,000 2,275,000
With no related allowance recorded, principal balance 1,980,000 1,858,000
With no related allowance recorded, average recorded principal balance 1,951,000 1,394,000
With related allowance recorded, unpaid principal balance 172,000 175,000
With related allowance recorded, principal balance 172,000 175,000
Related allowance 4,000 6,000
With related allowance recorded, average recorded principal balance 120,000 185,000
Total unpaid principal balance 2,784,000 2,450,000
Total principal balance 2,152,000 2,033,000
Total average recorded principal balance 2,071,000 1,579,000
Acquired Loan [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
With no related allowance recorded, unpaid principal balance 531,000 471,000
With no related allowance recorded, principal balance 351,000 310,000
With no related allowance recorded, average recorded principal balance 389,000 400,000
With related allowance recorded, unpaid principal balance 0 0
With related allowance recorded, principal balance 0 0
Related allowance 0 0
With related allowance recorded, average recorded principal balance 0 0
Acquired Loan [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
With no related allowance recorded, unpaid principal balance 2,081,000 1,804,000
With no related allowance recorded, principal balance 1,629,000 1,548,000
With no related allowance recorded, average recorded principal balance 1,562,000 994,000
With related allowance recorded, unpaid principal balance 172,000 175,000
With related allowance recorded, principal balance 172,000 175,000
Related allowance 4,000 6,000
With related allowance recorded, average recorded principal balance $ 120,000 $ 185,000