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Note 3 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]      
Past due loans $ 28,000 $ 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 0 432,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 0 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 28,000 432,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]      
Past due loans 64,000 0  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 27,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 125,000 323,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 0 53,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 0 223,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 189,000 626,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]      
Past due loans 38,000 186,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 252,000 107,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 290,000 293,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]      
Past due loans 242,000 395,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 1,081,000 960,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 1,323,000 1,355,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated Loan [Member]      
Past due loans 318,000 725,000  
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired Loan [Member]      
Past due loans 1,512,000 1,981,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]      
Past due loans 0 5,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 0 425,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 507,000 703,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 0 54,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 507,000 1,187,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]      
Past due loans 4,000 108,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 0 95,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 4,000 203,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]      
Past due loans 89,000 44,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 130,000 354,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 219,000 398,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated Loan [Member]      
Past due loans 4,000 203,000  
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired Loan [Member]      
Past due loans 726,000 1,585,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]      
Past due loans 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 0 9,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 0 9,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]      
Past due loans 16,000 541,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 179,000 1,142,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 222,000 79,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 156,000 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 573,000 1,762,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]      
Past due loans 8,000 0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 262,000 356,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 270,000 356,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]      
Past due loans 40,000 28,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 477,000 416,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 517,000 444,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated Loan [Member]      
Past due loans 270,000 365,000  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired Loan [Member]      
Past due loans 1,090,000 2,206,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]      
Past due loans 28,000 0  
Current past due 667,023,000 577,872,000  
Loans 667,051,000 577,872,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 0  
Current past due 28,003,000 30,138,000  
Loans 28,003,000 30,138,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 0 441,000  
Current past due 346,323,000 330,357,000  
Loans 346,323,000 330,798,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 0 0  
Current past due 638,090,000 520,754,000  
Loans 638,090,000 520,754,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 0 0  
Current past due 46,239,000 33,954,000  
Loans 46,239,000 33,954,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 28,000 441,000  
Current past due 1,725,678,000 1,493,075,000  
Loans 1,725,706,000 1,493,516,000 $ 1,402,320,000
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]      
Past due loans 80,000 546,000  
Current past due 83,199,000 117,885,000  
Loans 83,279,000 118,431,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Past due loans 0 27,000  
Current past due 9,452,000 14,955,000  
Loans 9,452,000 14,982,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Past due loans 304,000 1,890,000  
Current past due 94,077,000 113,231,000  
Loans 94,381,000 115,121,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Past due loans 729,000 835,000  
Current past due 102,625,000 122,762,000  
Loans 103,354,000 123,597,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Past due loans 156,000 277,000  
Current past due 71,708,000 80,772,000  
Loans 71,864,000 81,049,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 1,269,000 3,575,000  
Current past due 361,061,000 449,605,000  
Loans 362,330,000 453,180,000  
Loans past due 90 days or more still accruing interest 0 0  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Loans 750,330,000 696,303,000  
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Loans 37,455,000 45,120,000  
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]      
Loans 440,704,000 445,919,000  
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]      
Loans 741,444,000 644,351,000  
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]      
Loans 118,103,000 115,003,000  
Commercial Portfolio Segment [Member]      
Loans 2,088,036,000 1,946,696,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]      
Past due loans 50,000 294,000  
Current past due 72,630,000 67,522,000  
Loans 72,680,000 67,816,000  
Loans past due 90 days or more still accruing interest 0 0  
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 514,000 558,000  
Current past due 74,321,000 54,697,000  
Loans 74,835,000 55,255,000  
Loans past due 90 days or more still accruing interest 0 0  
Retail Portfolio Segment [Member] | Originated Loan [Member]      
Past due loans 564,000 852,000  
Current past due 146,951,000 122,219,000  
Loans 147,515,000 123,071,000 117,390,000
Loans past due 90 days or more still accruing interest 0 0  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]      
Past due loans 371,000 467,000  
Current past due 54,575,000 72,363,000  
Loans 54,946,000 72,830,000  
Loans past due 90 days or more still accruing interest 0 5,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]      
Past due loans 1,688,000 1,730,000  
Current past due 114,192,000 133,400,000  
Loans 115,880,000 135,130,000  
Loans past due 90 days or more still accruing interest 0 0  
Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Past due loans 2,059,000 2,197,000  
Current past due 168,767,000 205,763,000  
Loans 170,826,000 207,960,000  
Loans past due 90 days or more still accruing interest 0 5,000  
Retail Portfolio Segment [Member] | Home Equity and Other [Member]      
Loans 127,626,000 140,646,000  
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]      
Loans 190,715,000 190,385,000  
Retail Portfolio Segment [Member]      
Loans 318,341,000 331,031,000  
Originated Loan [Member]      
Past due loans 592,000 1,293,000  
Current past due 1,872,629,000 1,615,294,000  
Loans 1,873,221,000 1,616,587,000 $ 1,519,710,000
Loans past due 90 days or more still accruing interest 0 0  
Acquired Loan [Member]      
Past due loans 3,328,000 5,772,000  
Current past due 529,828,000 655,368,000  
Loans 533,156,000 661,140,000  
Loans past due 90 days or more still accruing interest 0 5,000  
Loans $ 2,406,377,000 $ 2,277,727,000