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Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired Loans - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Originated Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance $ 9,871,000   $ 9,871,000   $ 8,255,000
Recorded principal balance, with no related allowance 8,995,000   8,995,000   5,552,000
Average recorded principal balance, with no related allowance 7,137,000 $ 3,404,000 6,609,000 $ 3,437,000  
Unpaid contractual principal balance, with a related allowance 16,312,000   16,312,000   42,757,000
Recorded principal balance, with a related allowance 11,293,000   11,293,000   42,304,000
Related allowance 2,324,000   2,324,000   10,152,000
Average recorded principal balance, with a related allowance 25,732,000 28,597,000 31,255,000 30,187,000  
Upaid contractual principal balance 26,183,000   26,183,000   51,012,000
Recorded principal balance 20,288,000   20,288,000   47,856,000
Average recorded principal balance 32,869,000 32,001,000 37,864,000 33,624,000  
Acquired Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 7,083,000   7,083,000   4,019,000
Recorded principal balance, with no related allowance 6,680,000   6,680,000   4,010,000
Average recorded principal balance, with no related allowance 5,191,000 0 4,797,000 0  
Unpaid contractual principal balance, with a related allowance 1,625,000   1,625,000   1,516,000
Recorded principal balance, with a related allowance 1,475,000   1,475,000   1,502,000
Related allowance 584,000   584,000   605,000
Average recorded principal balance, with a related allowance 1,664,000 0 1,611,000 0  
Upaid contractual principal balance 8,708,000   8,708,000   5,535,000
Recorded principal balance 8,155,000   8,155,000   5,512,000
Average recorded principal balance 6,855,000 0 6,408,000 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 8,356,000   8,356,000   6,904,000
Recorded principal balance, with no related allowance 8,110,000   8,110,000   4,801,000
Average recorded principal balance, with no related allowance 6,333,000 2,172,000 5,822,000 2,246,000  
Unpaid contractual principal balance, with a related allowance 15,949,000   15,949,000   40,448,000
Recorded principal balance, with a related allowance 10,998,000   10,998,000   40,220,000
Related allowance 2,147,000   2,147,000   9,374,000
Average recorded principal balance, with a related allowance 25,350,000 26,370,000 30,306,000 27,862,000  
Upaid contractual principal balance 24,305,000   24,305,000   47,352,000
Recorded principal balance 19,108,000   19,108,000   45,021,000
Average recorded principal balance 31,683,000 28,542,000 36,128,000 30,108,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 1,923,000   1,923,000   1,170,000
Recorded principal balance, with no related allowance 1,923,000   1,923,000   1,164,000
Average recorded principal balance, with no related allowance 1,930,000 169,000 1,674,000 283,000  
Unpaid contractual principal balance, with a related allowance 513,000   513,000   5,299,000
Recorded principal balance, with a related allowance 460,000   460,000   5,226,000
Related allowance 436,000   436,000   1,578,000
Average recorded principal balance, with a related allowance 2,812,000 882,000 3,617,000 1,068,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 0   0   540,000
Recorded principal balance, with no related allowance 0   0   209,000
Average recorded principal balance, with no related allowance 98,000 171,000 135,000 235,000  
Unpaid contractual principal balance, with a related allowance 2,530,000   2,530,000   2,000,000
Recorded principal balance, with a related allowance 2,184,000   2,184,000   2,000,000
Related allowance 376,000   376,000   151,000
Average recorded principal balance, with a related allowance 2,092,000 3,604,000 2,061,000 3,782,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 312,000   312,000   3,609,000
Recorded principal balance, with no related allowance 124,000   124,000   1,901,000
Average recorded principal balance, with no related allowance 1,062,000 662,000 1,342,000 703,000  
Unpaid contractual principal balance, with a related allowance 6,646,000   6,646,000   15,745,000
Recorded principal balance, with a related allowance 2,094,000   2,094,000   15,674,000
Related allowance 637,000   637,000   2,200,000
Average recorded principal balance, with a related allowance 8,806,000 1,974,000 11,095,000 1,820,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 5,761,000   5,761,000   1,210,000
Recorded principal balance, with no related allowance 5,761,000   5,761,000   1,210,000
Average recorded principal balance, with no related allowance 2,937,000 1,169,000 2,362,000 1,024,000  
Unpaid contractual principal balance, with a related allowance 4,955,000   4,955,000   16,033,000
Recorded principal balance, with a related allowance 4,955,000   4,955,000   15,949,000
Related allowance 206,000   206,000   4,779,000
Average recorded principal balance, with a related allowance 10,319,000 18,591,000 12,195,000 19,418,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 360,000   360,000   375,000
Recorded principal balance, with no related allowance 302,000   302,000   317,000
Average recorded principal balance, with no related allowance 306,000 1,000 309,000 1,000  
Unpaid contractual principal balance, with a related allowance 1,305,000   1,305,000   1,371,000
Recorded principal balance, with a related allowance 1,305,000   1,305,000   1,371,000
Related allowance 492,000   492,000   666,000
Average recorded principal balance, with a related allowance 1,321,000 1,319,000 1,338,000 1,774,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 5,795,000   5,795,000   2,512,000
Recorded principal balance, with no related allowance 5,639,000   5,639,000   2,505,000
Average recorded principal balance, with no related allowance 4,025,000 0 3,518,000 0  
Unpaid contractual principal balance, with a related allowance 1,283,000   1,283,000   1,516,000
Recorded principal balance, with a related allowance 1,193,000   1,193,000   1,502,000
Related allowance 571,000   571,000   605,000
Average recorded principal balance, with a related allowance 1,381,000 0 1,422,000 0  
Upaid contractual principal balance 7,078,000   7,078,000   4,028,000
Recorded principal balance 6,832,000   6,832,000   4,007,000
Average recorded principal balance 5,406,000 0 4,940,000 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 1,565,000   1,565,000   1,586,000
Recorded principal balance, with no related allowance 1,532,000   1,532,000   1,579,000
Average recorded principal balance, with no related allowance 1,244,000 0 1,356,000 0  
Unpaid contractual principal balance, with a related allowance 80,000   80,000   0
Recorded principal balance, with a related allowance 80,000   80,000   0
Related allowance 9,000   9,000   0
Average recorded principal balance, with a related allowance 97,000 0 65,000 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 0   0   0
Recorded principal balance, with no related allowance 0   0   0
Average recorded principal balance, with no related allowance 0 0 0 0  
Unpaid contractual principal balance, with a related allowance 0   0   0
Recorded principal balance, with a related allowance 0   0   0
Related allowance 0   0   0
Average recorded principal balance, with a related allowance 0 0 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 492,000   492,000   113,000
Recorded principal balance, with no related allowance 429,000   429,000   113,000
Average recorded principal balance, with no related allowance 317,000 0 249,000 0  
Unpaid contractual principal balance, with a related allowance 1,177,000   1,177,000   1,516,000
Recorded principal balance, with a related allowance 1,086,000   1,086,000   1,502,000
Related allowance 561,000   561,000   605,000
Average recorded principal balance, with a related allowance 1,256,000 0 1,338,000 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 586,000   586,000   326,000
Recorded principal balance, with no related allowance 545,000   545,000   326,000
Average recorded principal balance, with no related allowance 427,000 0 393,000 0  
Unpaid contractual principal balance, with a related allowance 0   0   0
Recorded principal balance, with a related allowance 0   0   0
Related allowance 0   0   0
Average recorded principal balance, with a related allowance 0 0 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 3,152,000   3,152,000   487,000
Recorded principal balance, with no related allowance 3,133,000   3,133,000   487,000
Average recorded principal balance, with no related allowance 2,037,000 0 1,520,000 0  
Unpaid contractual principal balance, with a related allowance 26,000   26,000   0
Recorded principal balance, with a related allowance 27,000   27,000   0
Related allowance 1,000   1,000   0
Average recorded principal balance, with a related allowance 28,000 0 19,000 0  
Retail Portfolio Segment [Member] | Originated Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 1,515,000   1,515,000   1,351,000
Recorded principal balance, with no related allowance 885,000   885,000   751,000
Average recorded principal balance, with no related allowance 804,000 1,232,000 787,000 1,191,000  
Unpaid contractual principal balance, with a related allowance 363,000   363,000   2,309,000
Recorded principal balance, with a related allowance 295,000   295,000   2,084,000
Related allowance 177,000   177,000   778,000
Average recorded principal balance, with a related allowance 382,000 2,227,000 949,000 2,325,000  
Upaid contractual principal balance 1,878,000   1,878,000   3,660,000
Recorded principal balance 1,180,000   1,180,000   2,835,000
Average recorded principal balance 1,186,000 3,459,000 1,736,000 3,516,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 206,000   206,000   207,000
Recorded principal balance, with no related allowance 188,000   188,000   191,000
Average recorded principal balance, with no related allowance 189,000 647,000 190,000 585,000  
Unpaid contractual principal balance, with a related allowance 198,000   198,000   115,000
Recorded principal balance, with a related allowance 163,000   163,000   84,000
Related allowance 126,000   126,000   84,000
Average recorded principal balance, with a related allowance 165,000 91,000 138,000 157,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 1,309,000   1,309,000   1,144,000
Recorded principal balance, with no related allowance 697,000   697,000   560,000
Average recorded principal balance, with no related allowance 615,000 585,000 597,000 606,000  
Unpaid contractual principal balance, with a related allowance 165,000   165,000   2,194,000
Recorded principal balance, with a related allowance 132,000   132,000   2,000,000
Related allowance 51,000   51,000   694,000
Average recorded principal balance, with a related allowance 217,000 2,136,000 811,000 2,168,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 1,288,000   1,288,000   1,507,000
Recorded principal balance, with no related allowance 1,041,000   1,041,000   1,505,000
Average recorded principal balance, with no related allowance 1,166,000 0 1,279,000 0  
Unpaid contractual principal balance, with a related allowance 342,000   342,000   0
Recorded principal balance, with a related allowance 282,000   282,000   0
Related allowance 13,000   13,000   0
Average recorded principal balance, with a related allowance 283,000 0 189,000 0  
Upaid contractual principal balance 1,630,000   1,630,000   1,507,000
Recorded principal balance 1,323,000   1,323,000   1,505,000
Average recorded principal balance 1,449,000 0 1,468,000 0  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 485,000   485,000   641,000
Recorded principal balance, with no related allowance 361,000   361,000   639,000
Average recorded principal balance, with no related allowance 365,000 0 456,000 0  
Unpaid contractual principal balance, with a related allowance 0   0   0
Recorded principal balance, with a related allowance 0   0   0
Related allowance 0   0   0
Average recorded principal balance, with a related allowance 0 0 0 0  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid contractual principal balance, with no related allowance 803,000   803,000   866,000
Recorded principal balance, with no related allowance 680,000   680,000   866,000
Average recorded principal balance, with no related allowance 801,000 0 823,000 0  
Unpaid contractual principal balance, with a related allowance 342,000   342,000   0
Recorded principal balance, with a related allowance 282,000   282,000   0
Related allowance 13,000   13,000   $ 0
Average recorded principal balance, with a related allowance $ 283,000 $ 0 $ 189,000 $ 0