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Note 3 - Loans and Allowance for Loan Losses (Details) - Age Analysis of Past Due Loans - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Commercial:      
Loans $ 2,295,668,000 $ 2,277,727,000  
Originated Loan [Member]      
Commercial:      
Loans, past due 898,000 1,293,000  
Loans, current 1,686,578,000 1,615,294,000  
Loans 1,687,476,000 1,616,587,000 $ 1,328,713,000
Loans, recorded balance > 89 days and accruing 0 0  
Originated Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 524,000 725,000  
Originated Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 17,000 203,000  
Originated Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 357,000 365,000  
Acquired Loan [Member]      
Commercial:      
Loans, past due 4,014,000 5,772,000  
Loans, current 604,178,000 655,368,000  
Loans 608,192,000 661,140,000  
Loans, recorded balance > 89 days and accruing 0 5,000  
Acquired Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 1,636,000 1,981,000  
Acquired Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 384,000 1,585,000  
Acquired Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 1,994,000 2,206,000  
Commercial Portfolio Segment [Member]      
Commercial:      
Loans 1,974,450,000 1,946,696,000  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Commercial:      
Loans 714,612,000 696,303,000  
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Commercial:      
Loans 39,630,000 45,120,000  
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]      
Commercial:      
Loans 441,662,000 445,919,000  
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]      
Commercial:      
Loans 666,013,000 644,351,000  
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Commercial:      
Loans 112,533,000 115,003,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Commercial:      
Loans, past due 429,000 441,000  
Loans, current 1,562,348,000 1,493,075,000  
Loans 1,562,777,000 1,493,516,000 1,230,841,000
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 425,000 432,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 4,000 9,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]      
Commercial:      
Loans, past due 0 0  
Loans, current 613,570,000 577,872,000  
Loans 613,570,000 577,872,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Commercial:      
Loans, past due 0 0  
Loans, current 28,451,000 30,138,000  
Loans 28,451,000 30,138,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Commercial:      
Loans, past due 429,000 441,000  
Loans, current 334,519,000 330,357,000  
Loans 334,948,000 330,798,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 425,000 432,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 4,000 9,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Commercial:      
Loans, past due 0 0  
Loans, current 549,226,000 520,754,000  
Loans 549,226,000 520,754,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Commercial:      
Loans, past due 0 0  
Loans, current 36,582,000 33,954,000  
Loans 36,582,000 33,954,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member]      
Commercial:      
Loans, past due 1,915,000 3,575,000  
Loans, current 409,758,000 449,605,000  
Loans 411,673,000 453,180,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 304,000 626,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 17,000 1,187,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 1,594,000 1,762,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]      
Commercial:      
Loans, past due 420,000 546,000  
Loans, current 100,622,000 117,885,000  
Loans 101,042,000 118,431,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 20,000 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 17,000 5,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 383,000 541,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Commercial:      
Loans, past due 0 27,000  
Loans, current 11,179,000 14,955,000  
Loans 11,179,000 14,982,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 27,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]      
Commercial:      
Loans, past due 917,000 1,890,000  
Loans, current 105,797,000 113,231,000  
Loans 106,714,000 115,121,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 269,000 323,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 425,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 648,000 1,142,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Commercial:      
Loans, past due 498,000 835,000  
Loans, current 116,289,000 122,762,000  
Loans 116,787,000 123,597,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 53,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 703,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 498,000 79,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Commercial:      
Loans, past due 80,000 277,000  
Loans, current 75,871,000 80,772,000  
Loans 75,951,000 81,049,000  
Loans, recorded balance > 89 days and accruing 0 0  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 15,000 223,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 54,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 65,000 0  
Retail Portfolio Segment [Member]      
Commercial:      
Loans 321,218,000 331,031,000  
Retail Portfolio Segment [Member] | Home Equity and Other [Member]      
Commercial:      
Loans 135,683,000 140,646,000  
Retail Portfolio Segment [Member] | 1-4 Family Mortgages [Member]      
Commercial:      
Loans 185,535,000 190,385,000  
Retail Portfolio Segment [Member] | Originated Loan [Member]      
Commercial:      
Loans, past due 469,000 852,000  
Loans, current 124,230,000 122,219,000  
Loans 124,699,000 123,071,000 $ 97,872,000
Loans, recorded balance > 89 days and accruing 0 0  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 99,000 293,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 17,000 203,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 353,000 356,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]      
Commercial:      
Loans, past due 101,000 294,000  
Loans, current 68,241,000 67,522,000  
Loans 68,342,000 67,816,000  
Loans, recorded balance > 89 days and accruing 0 0  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 99,000 186,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 0 108,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 2,000 0  
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]      
Commercial:      
Loans, past due 368,000 558,000  
Loans, current 55,989,000 54,697,000  
Loans 56,357,000 55,255,000  
Loans, recorded balance > 89 days and accruing 0 0  
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 0 107,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 17,000 95,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 351,000 356,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Commercial:      
Loans, past due 2,099,000 2,197,000  
Loans, current 194,420,000 205,763,000  
Loans 196,519,000 207,960,000  
Loans, recorded balance > 89 days and accruing 0 5,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 1,332,000 1,355,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 367,000 398,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 400,000 444,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]      
Commercial:      
Loans, past due 506,000 467,000  
Loans, current 66,835,000 72,363,000  
Loans 67,341,000 72,830,000  
Loans, recorded balance > 89 days and accruing 0 5,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 353,000 395,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 134,000 44,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 19,000 28,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]      
Commercial:      
Loans, past due 1,593,000 1,730,000  
Loans, current 127,585,000 133,400,000  
Loans 129,178,000 135,130,000  
Loans, recorded balance > 89 days and accruing 0 0  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 979,000 960,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 233,000 354,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due $ 381,000 $ 416,000