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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Originated Loan [Member]          
Total average recorded principal balance $ 12,311,000 $ 18,051,000 $ 12,666,000 $ 18,099,000  
With no related allowance recorded, unpaid principal balance 3,565,000   3,565,000   $ 3,499,000
With no related allowance recorded, principal balance 1,731,000   1,731,000   2,467,000
With no related allowance recorded, average recorded principal balance 2,516,000 8,504,000 2,498,000 8,458,000  
With related allowance recorded, unpaid principal balance 8,767,000   8,767,000   11,008,000
With related allowance recorded, principal balance 8,682,000   8,682,000   10,916,000
Total unpaid principal balance 12,332,000   12,332,000   14,507,000
Total principal balance 10,413,000   10,413,000   13,383,000
Related allowance 2,799,000   2,799,000   1,572,000
With related allowance recorded, average recorded principal balance 9,795,000 9,547,000 10,168,000 9,641,000  
Originated Loan [Member] | Commercial Portfolio Segment [Member]          
Total average recorded principal balance 10,025,000 16,729,000 10,705,000 16,767,000  
With no related allowance recorded, unpaid principal balance 1,591,000   1,591,000   2,115,000
With no related allowance recorded, principal balance 425,000   425,000   1,723,000
With no related allowance recorded, average recorded principal balance 1,338,000 7,818,000 1,465,000 7,780,000  
With related allowance recorded, unpaid principal balance 7,580,000   7,580,000   10,370,000
With related allowance recorded, principal balance 7,564,000   7,564,000   10,347,000
Total unpaid principal balance 9,171,000   9,171,000   12,485,000
Total principal balance 7,989,000   7,989,000   12,070,000
Related allowance 2,044,000   2,044,000   1,303,000
With related allowance recorded, average recorded principal balance 8,687,000 8,911,000 9,240,000 8,987,000  
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]          
With no related allowance recorded, unpaid principal balance 796,000   796,000   1,498,000
With no related allowance recorded, principal balance 42,000   42,000   1,498,000
With no related allowance recorded, average recorded principal balance 861,000 2,017,000 1,073,000 1,845,000  
With related allowance recorded, unpaid principal balance 4,180,000   4,180,000   2,405,000
With related allowance recorded, principal balance 4,170,000   4,170,000   2,382,000
Related allowance 1,655,000   1,655,000   673,000
With related allowance recorded, average recorded principal balance 3,584,000 217,000 3,183,000 246,000  
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 471,000   471,000   487,000
With no related allowance recorded, principal balance 65,000   65,000   95,000
With no related allowance recorded, average recorded principal balance 73,000 0 80,000 0  
With related allowance recorded, unpaid principal balance 499,000   499,000   999,000
With related allowance recorded, principal balance 499,000   499,000   999,000
Related allowance 12,000   12,000   28,000
With related allowance recorded, average recorded principal balance 499,000 1,633,000 665,000 1,640,000  
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]          
With no related allowance recorded, unpaid principal balance 324,000   324,000   0
With no related allowance recorded, principal balance 318,000   318,000   0
With no related allowance recorded, average recorded principal balance 272,000 160,000 181,000 275,000  
With related allowance recorded, unpaid principal balance 1,836,000   1,836,000   906,000
With related allowance recorded, principal balance 1,830,000   1,830,000   906,000
Related allowance 269,000   269,000   97,000
With related allowance recorded, average recorded principal balance 1,606,000 1,339,000 1,373,000 1,331,000  
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]          
With no related allowance recorded, unpaid principal balance 0   0   0
With no related allowance recorded, principal balance 0   0   0
With no related allowance recorded, average recorded principal balance 0 5,641,000 0 5,660,000  
With related allowance recorded, unpaid principal balance 489,000   489,000   5,020,000
With related allowance recorded, principal balance 489,000   489,000   5,020,000
Related allowance 4,000   4,000   247,000
With related allowance recorded, average recorded principal balance 2,479,000 4,729,000 3,326,000 4,766,000  
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]          
With no related allowance recorded, unpaid principal balance 0   0   130,000
With no related allowance recorded, principal balance 0   0   130,000
With no related allowance recorded, average recorded principal balance 132,000 0 131,000 0  
With related allowance recorded, unpaid principal balance 576,000   576,000   1,040,000
With related allowance recorded, principal balance 576,000   576,000   1,040,000
Related allowance 104,000   104,000   258,000
With related allowance recorded, average recorded principal balance 519,000 993,000 693,000 1,004,000  
Originated Loan [Member] | Retail Portfolio Segment [Member]          
Total average recorded principal balance 2,286,000 1,322,000 1,961,000 1,332,000  
With no related allowance recorded, unpaid principal balance 1,974,000   1,974,000   1,384,000
With no related allowance recorded, principal balance 1,306,000   1,306,000   744,000
With no related allowance recorded, average recorded principal balance 1,178,000 686,000 1,033,000 678,000  
With related allowance recorded, unpaid principal balance 1,187,000   1,187,000   638,000
With related allowance recorded, principal balance 1,118,000   1,118,000   569,000
Total unpaid principal balance 3,161,000   3,161,000   2,022,000
Total principal balance 2,424,000   2,424,000   1,313,000
Related allowance 755,000   755,000   269,000
With related allowance recorded, average recorded principal balance 1,108,000 636,000 928,000 654,000  
Originated Loan [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]          
With no related allowance recorded, unpaid principal balance 693,000   693,000   114,000
With no related allowance recorded, principal balance 681,000   681,000   114,000
With no related allowance recorded, average recorded principal balance 531,000 65,000 392,000 45,000  
With related allowance recorded, unpaid principal balance 1,022,000   1,022,000   434,000
With related allowance recorded, principal balance 1,004,000   1,004,000   412,000
Related allowance 738,000   738,000   203,000
With related allowance recorded, average recorded principal balance 993,000 491,000 799,000 515,000  
Originated Loan [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]          
With no related allowance recorded, unpaid principal balance 1,281,000   1,281,000   1,270,000
With no related allowance recorded, principal balance 625,000   625,000   630,000
With no related allowance recorded, average recorded principal balance 647,000 621,000 641,000 633,000  
With related allowance recorded, unpaid principal balance 165,000   165,000   204,000
With related allowance recorded, principal balance 114,000   114,000   157,000
Related allowance 17,000   17,000   66,000
With related allowance recorded, average recorded principal balance 115,000 145,000 129,000 139,000  
Acquired Loan [Member]          
Total average recorded principal balance 5,756,000 6,257,000 5,548,000 6,573,000  
With no related allowance recorded, unpaid principal balance 6,673,000   6,673,000   5,826,000
With no related allowance recorded, principal balance 6,036,000   6,036,000   4,894,000
With no related allowance recorded, average recorded principal balance 5,523,000 5,733,000 5,313,000 6,016,000  
With related allowance recorded, unpaid principal balance 230,000   230,000   239,000
With related allowance recorded, principal balance 230,000   230,000   239,000
Total unpaid principal balance 6,903,000   6,903,000   6,065,000
Total principal balance 6,266,000   6,266,000   5,133,000
Related allowance 8,000   8,000   9,000
With related allowance recorded, average recorded principal balance 233,000 524,000 235,000 557,000  
Acquired Loan [Member] | Commercial Portfolio Segment [Member]          
Total average recorded principal balance 3,408,000 4,559,000 3,266,000 4,764,000  
With no related allowance recorded, unpaid principal balance 3,732,000   3,732,000   3,214,000
With no related allowance recorded, principal balance 3,699,000   3,699,000   2,914,000
With no related allowance recorded, average recorded principal balance 3,346,000 4,122,000 3,202,000 4,323,000  
With related allowance recorded, unpaid principal balance 59,000   59,000   67,000
With related allowance recorded, principal balance 59,000   59,000   67,000
Total unpaid principal balance 3,791,000   3,791,000   3,281,000
Total principal balance 3,758,000   3,758,000   2,981,000
Related allowance 4,000   4,000   5,000
With related allowance recorded, average recorded principal balance 62,000 437,000 64,000 441,000  
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]          
With no related allowance recorded, unpaid principal balance 1,348,000   1,348,000   853,000
With no related allowance recorded, principal balance 1,335,000   1,335,000   826,000
With no related allowance recorded, average recorded principal balance 1,146,000 1,556,000 1,040,000 1,535,000  
With related allowance recorded, unpaid principal balance 12,000   12,000   19,000
With related allowance recorded, principal balance 12,000   12,000   19,000
Related allowance 1,000   1,000   2,000
With related allowance recorded, average recorded principal balance 15,000 367,000 16,000 370,000  
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 33,000   33,000   0
With no related allowance recorded, principal balance 33,000   33,000   0
With no related allowance recorded, average recorded principal balance 17,000 0 11,000 0  
With related allowance recorded, unpaid principal balance 0   0   0
With related allowance recorded, principal balance 0   0   0
Related allowance 0   0   0
With related allowance recorded, average recorded principal balance 0 0 0 0  
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]          
With no related allowance recorded, unpaid principal balance 1,163,000   1,163,000   1,281,000
With no related allowance recorded, principal balance 1,158,000   1,158,000   1,210,000
With no related allowance recorded, average recorded principal balance 1,125,000 1,485,000 1,153,000 1,640,000  
With related allowance recorded, unpaid principal balance 47,000   47,000   48,000
With related allowance recorded, principal balance 47,000   47,000   48,000
Related allowance 3,000   3,000   3,000
With related allowance recorded, average recorded principal balance 47,000 50,000 48,000 50,000  
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]          
With no related allowance recorded, unpaid principal balance 962,000   962,000   928,000
With no related allowance recorded, principal balance 962,000   962,000   789,000
With no related allowance recorded, average recorded principal balance 837,000 792,000 821,000 821,000  
With related allowance recorded, unpaid principal balance 0   0   0
With related allowance recorded, principal balance 0   0   0
Related allowance 0   0   0
With related allowance recorded, average recorded principal balance 0 0 0 0  
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]          
With no related allowance recorded, unpaid principal balance 226,000   226,000   152,000
With no related allowance recorded, principal balance 211,000   211,000   89,000
With no related allowance recorded, average recorded principal balance 221,000 289,000 177,000 327,000  
With related allowance recorded, unpaid principal balance 0   0   0
With related allowance recorded, principal balance 0   0   0
Related allowance 0   0   0
With related allowance recorded, average recorded principal balance 0 20,000 0 21,000  
Acquired Loan [Member] | Retail Portfolio Segment [Member]          
Total average recorded principal balance 2,348,000 1,698,000 2,282,000 1,809,000  
With no related allowance recorded, unpaid principal balance 2,941,000   2,941,000   2,612,000
With no related allowance recorded, principal balance 2,337,000   2,337,000   1,980,000
With no related allowance recorded, average recorded principal balance 2,177,000 1,611,000 2,111,000 1,693,000  
With related allowance recorded, unpaid principal balance 171,000   171,000   172,000
With related allowance recorded, principal balance 171,000   171,000   172,000
Total unpaid principal balance 3,112,000   3,112,000   2,784,000
Total principal balance 2,508,000   2,508,000   2,152,000
Related allowance 4,000   4,000   4,000
With related allowance recorded, average recorded principal balance 171,000 87,000 171,000 116,000  
Acquired Loan [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]          
With no related allowance recorded, unpaid principal balance 584,000   584,000   531,000
With no related allowance recorded, principal balance 410,000   410,000   351,000
With no related allowance recorded, average recorded principal balance 366,000 321,000 361,000 317,000  
With related allowance recorded, unpaid principal balance 0   0   0
With related allowance recorded, principal balance 0   0   0
Related allowance 0   0   0
With related allowance recorded, average recorded principal balance 0 0 0 0  
Acquired Loan [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]          
With no related allowance recorded, unpaid principal balance 2,357,000   2,357,000   2,081,000
With no related allowance recorded, principal balance 1,927,000   1,927,000   1,629,000
With no related allowance recorded, average recorded principal balance 1,811,000 1,290,000 1,750,000 1,376,000  
With related allowance recorded, unpaid principal balance 171,000   171,000   172,000
With related allowance recorded, principal balance 171,000   171,000   172,000
Related allowance 4,000   4,000   $ 4,000
With related allowance recorded, average recorded principal balance $ 171,000 $ 87,000 $ 171,000 $ 116,000