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Note 4 - Loans and Allowance for Loan Losses (Details) - Age Analysis of Past Due Loans - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commercial:      
Loans $ 2,277,727,000 $ 2,089,277,000  
Originated Loan [Member]      
Commercial:      
Loans, past due 1,293,000 643,000  
Loans, current 1,615,294,000 1,245,473,000  
Loans 1,616,587,000 1,246,116,000 $ 1,053,243,000
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 725,000 38,000  
Originated Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 203,000 3,000  
Originated Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 365,000 602,000  
Acquired Loan [Member]      
Commercial:      
Loans, past due 5,772,000 6,743,000  
Loans, current 655,368,000 836,418,000  
Loans 661,140,000 843,161,000  
Loans, recorded balance > 89 days and accruing 5,000 26,000  
Acquired Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 1,981,000 1,717,000  
Acquired Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 1,585,000 1,920,000  
Acquired Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 2,206,000 3,106,000  
Commercial Portfolio Segment [Member]      
Commercial:      
Loans 1,946,696,000 1,715,303,000  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Commercial:      
Loans 696,303,000 550,607,000  
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Commercial:      
Loans 45,120,000 51,974,000  
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]      
Commercial:      
Loans 445,919,000 430,388,000  
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]      
Commercial:      
Loans 644,351,000 559,574,000  
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Commercial:      
Loans 115,003,000 122,760,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member]      
Commercial:      
Loans, past due 441,000 236,000  
Loans, current 1,493,075,000 1,152,953,000  
Loans 1,493,516,000 1,153,189,000 986,696,000
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 432,000 0  
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 9,000 236,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]      
Commercial:      
Loans, past due 0 0  
Loans, current 577,872,000 384,570,000  
Loans 577,872,000 384,570,000  
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 30,138,000 29,826,000  
Loans 30,138,000 29,826,000  
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 441,000 120,000  
Loans, current 330,357,000 291,638,000  
Loans 330,798,000 291,758,000  
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 432,000 0  
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 9,000 120,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Commercial:      
Loans, past due 0 116,000  
Loans, current 520,754,000 410,861,000  
Loans 520,754,000 410,977,000  
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 0 116,000  
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Commercial:      
Loans, past due 0 0  
Loans, current 33,954,000 36,058,000  
Loans 33,954,000 36,058,000  
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 3,575,000 3,479,000  
Loans, current 449,605,000 558,635,000  
Loans 453,180,000 562,114,000  
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 626,000 185,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 1,187,000 1,093,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 1,762,000 2,201,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]      
Commercial:      
Loans, past due 546,000 137,000  
Loans, current 117,885,000 165,900,000  
Loans 118,431,000 166,037,000  
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 0 29,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 5,000 32,000  
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 541,000 76,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]      
Commercial:      
Loans, past due 27,000 38,000  
Loans, current 14,955,000 22,110,000  
Loans 14,982,000 22,148,000  
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 27,000 0  
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 38,000  
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 1,890,000 2,101,000  
Loans, current 113,231,000 136,529,000  
Loans 115,121,000 138,630,000  
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 323,000 51,000  
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 425,000 425,000  
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 1,142,000 1,625,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]      
Commercial:      
Loans, past due 835,000 1,061,000  
Loans, current 122,762,000 147,536,000  
Loans 123,597,000 148,597,000  
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 53,000 68,000  
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 703,000 598,000  
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 79,000 395,000  
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Commercial:      
Loans, past due 277,000 142,000  
Loans, current 80,772,000 86,560,000  
Loans 81,049,000 86,702,000  
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 223,000 37,000  
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 54,000 0  
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 0 105,000  
Retail Portfolio Segment [Member]      
Commercial:      
Loans 331,031,000 373,974,000  
Retail Portfolio Segment [Member] | Home Equity and Other [Member]      
Commercial:      
Loans 140,646,000 159,278,000  
Retail Portfolio Segment [Member] | 1-4 Family Mortgages [Member]      
Commercial:      
Loans 190,385,000 214,696,000  
Retail Portfolio Segment [Member] | Originated Loan [Member]      
Commercial:      
Loans, past due 852,000 407,000  
Loans, current 122,219,000 92,520,000  
Loans 123,071,000 92,927,000 $ 66,547,000
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 293,000 38,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 203,000 3,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 356,000 366,000  
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]      
Commercial:      
Loans, past due 294,000 41,000  
Loans, current 67,522,000 50,018,000  
Loans 67,816,000 50,059,000  
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 186,000 38,000  
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 108,000 3,000  
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 0 0  
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]      
Commercial:      
Loans, past due 558,000 366,000  
Loans, current 54,697,000 42,502,000  
Loans 55,255,000 42,868,000  
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 107,000 0  
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 95,000 0  
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 356,000 366,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member]      
Commercial:      
Loans, past due 2,197,000 3,264,000  
Loans, current 205,763,000 277,783,000  
Loans 207,960,000 281,047,000  
Loans, recorded balance > 89 days and accruing 5,000 26,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Commercial:      
Loans, past due 1,355,000 1,532,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Commercial:      
Loans, past due 398,000 827,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Commercial:      
Loans, past due 444,000 905,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]      
Commercial:      
Loans, past due 467,000 1,019,000  
Loans, current 72,363,000 108,200,000  
Loans 72,830,000 109,219,000  
Loans, recorded balance > 89 days and accruing 5,000 26,000  
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 395,000 445,000  
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 44,000 419,000  
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 28,000 155,000  
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]      
Commercial:      
Loans, past due 1,730,000 2,245,000  
Loans, current 133,400,000 169,583,000  
Loans 135,130,000 171,828,000  
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 960,000 1,087,000  
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 354,000 408,000  
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 $ 416,000 $ 750,000