Note 4 - Loans and Allowance for Loan Losses (Details) - Impaired Loans (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	$ 5,224,000	$ 17,634,000	$ 5,224,000	$ 17,634,000
Loans with no allowance recorded, recorded principle balance	2,552,000	10,522,000	2,552,000	10,522,000
Loans with no allowance recorded, average recorded principle balance	3,404,000	10,726,000	3,437,000	11,068,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	28,781,000	44,000,000	28,781,000	44,000,000
Loans an allowance recorded, recorded principle balance	28,052,000	43,155,000	28,052,000	43,155,000
Related allowance	10,362,000	14,836,000	10,362,000	14,836,000
Loans an allowance recorded, average recorded principle balance	28,597,000	41,963,000	30,187,000	43,151,000
Total impaired loans:
Loans, unpaid contractual principle balance	34,005,000	61,634,000	34,005,000	61,634,000
Loans, recorded principle balance	30,604,000	53,677,000	30,604,000	53,677,000
Related allowance	10,362,000	14,836,000	10,362,000	14,836,000
Loans, average recorded principle balance	32,001,000	52,689,000	33,624,000	54,219,000
Commercial and Industrial [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	1,620,000	2,793,000	1,620,000	2,793,000
Loans with no allowance recorded, recorded principle balance	132,000	1,277,000	132,000	1,277,000
Loans with no allowance recorded, average recorded principle balance	169,000	1,416,000	283,000	1,483,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	939,000	1,708,000	939,000	1,708,000
Loans an allowance recorded, recorded principle balance	810,000	1,587,000	810,000	1,587,000
Related allowance	322,000	1,154,000	322,000	1,154,000
Loans an allowance recorded, average recorded principle balance	882,000	2,046,000	1,068,000	2,006,000
Total impaired loans:
Related allowance	322,000	1,154,000	322,000	1,154,000
Commercial Vacant Land and Land Development and Residential Construction Loan [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	0	1,543,000	0	1,543,000
Loans with no allowance recorded, recorded principle balance	0	1,010,000	0	1,010,000
Loans with no allowance recorded, average recorded principle balance	171,000	1,194,000	235,000	1,263,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	3,614,000	5,058,000	3,614,000	5,058,000
Loans an allowance recorded, recorded principle balance	3,300,000	4,515,000	3,300,000	4,515,000
Related allowance	351,000	1,223,000	351,000	1,223,000
Loans an allowance recorded, average recorded principle balance	3,604,000	2,998,000	3,782,000	2,738,000
Total impaired loans:
Related allowance	351,000	1,223,000	351,000	1,223,000
Commercial Real Estate Owner Occupied Loan [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	1,171,000	2,020,000	1,171,000	2,020,000
Loans with no allowance recorded, recorded principle balance	640,000	1,383,000	640,000	1,383,000
Loans with no allowance recorded, average recorded principle balance	662,000	1,366,000	703,000	1,430,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	2,460,000	2,402,000	2,460,000	2,402,000
Loans an allowance recorded, recorded principle balance	2,460,000	2,350,000	2,460,000	2,350,000
Related allowance	679,000	922,000	679,000	922,000
Loans an allowance recorded, average recorded principle balance	1,974,000	2,652,000	1,820,000	2,976,000
Total impaired loans:
Related allowance	679,000	922,000	679,000	922,000
Commercial Real Estate Non Owner Occupied Loan [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	578,000	8,067,000	578,000	8,067,000
Loans with no allowance recorded, recorded principle balance	577,000	5,194,000	577,000	5,194,000
Loans with no allowance recorded, average recorded principle balance	1,169,000	4,956,000	1,024,000	5,134,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	17,753,000	29,249,000	17,753,000	29,249,000
Loans an allowance recorded, recorded principle balance	17,731,000	29,233,000	17,731,000	29,233,000
Related allowance	7,414,000	9,672,000	7,414,000	9,672,000
Loans an allowance recorded, average recorded principle balance	18,591,000	29,778,000	19,418,000	30,840,000
Total impaired loans:
Related allowance	7,414,000	9,672,000	7,414,000	9,672,000
Commercial Real Estate Multi Family and Residential Rental Loan [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	41,000	1,468,000	41,000	1,468,000
Loans with no allowance recorded, recorded principle balance	0	514,000	0	514,000
Loans with no allowance recorded, average recorded principle balance	1,000	599,000	1,000	537,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	1,677,000	2,589,000	1,677,000	2,589,000
Loans an allowance recorded, recorded principle balance	1,549,000	2,527,000	1,549,000	2,527,000
Related allowance	674,000	835,000	674,000	835,000
Loans an allowance recorded, average recorded principle balance	1,319,000	2,609,000	1,774,000	3,047,000
Total impaired loans:
Related allowance	674,000	835,000	674,000	835,000
Commercial Portfolio Segment [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	3,410,000	15,891,000	3,410,000	15,891,000
Loans with no allowance recorded, recorded principle balance	1,349,000	9,378,000	1,349,000	9,378,000
Loans with no allowance recorded, average recorded principle balance	2,172,000	9,531,000	2,246,000	9,847,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	26,443,000	41,006,000	26,443,000	41,006,000
Loans an allowance recorded, recorded principle balance	25,850,000	40,212,000	25,850,000	40,212,000
Related allowance	9,440,000	13,806,000	9,440,000	13,806,000
Loans an allowance recorded, average recorded principle balance	26,370,000	40,083,000	27,862,000	41,607,000
Total impaired loans:
Loans, unpaid contractual principle balance	29,853,000	56,897,000	29,853,000	56,897,000
Loans, recorded principle balance	27,199,000	49,590,000	27,199,000	49,590,000
Related allowance	9,440,000	13,806,000	9,440,000	13,806,000
Loans, average recorded principle balance	28,542,000	49,614,000	30,108,000	51,454,000
Retail Home Equity and Other [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	707,000	508,000	707,000	508,000
Loans with no allowance recorded, recorded principle balance	644,000	468,000	644,000	468,000
Loans with no allowance recorded, average recorded principle balance	647,000	474,000	585,000	477,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	118,000	350,000	118,000	350,000
Loans an allowance recorded, recorded principle balance	90,000	324,000	90,000	324,000
Related allowance	90,000	134,000	90,000	134,000
Loans an allowance recorded, average recorded principle balance	91,000	335,000	157,000	355,000
Total impaired loans:
Related allowance	90,000	134,000	90,000	134,000
Retail 1-4 Family Mortgages [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	1,107,000	1,235,000	1,107,000	1,235,000
Loans with no allowance recorded, recorded principle balance	559,000	676,000	559,000	676,000
Loans with no allowance recorded, average recorded principle balance	585,000	721,000	606,000	744,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	2,220,000	2,644,000	2,220,000	2,644,000
Loans an allowance recorded, recorded principle balance	2,112,000	2,619,000	2,112,000	2,619,000
Related allowance	832,000	896,000	832,000	896,000
Loans an allowance recorded, average recorded principle balance	2,136,000	1,545,000	2,168,000	1,189,000
Total impaired loans:
Related allowance	832,000	896,000	832,000	896,000
Retail Loan [Member]
Commercial:
Loans with no allowance recorded, unpaid contractual principle balance	1,814,000	1,743,000	1,814,000	1,743,000
Loans with no allowance recorded, recorded principle balance	1,203,000	1,144,000	1,203,000	1,144,000
Loans with no allowance recorded, average recorded principle balance	1,232,000	1,195,000	1,191,000	1,221,000
Commercial:
Loans an allowance recorded, unpaid contractual principle balance	2,338,000	2,994,000	2,338,000	2,994,000
Loans an allowance recorded, recorded principle balance	2,202,000	2,943,000	2,202,000	2,943,000
Related allowance	922,000	1,030,000	922,000	1,030,000
Loans an allowance recorded, average recorded principle balance	2,227,000	1,880,000	2,325,000	1,544,000
Total impaired loans:
Loans, unpaid contractual principle balance	4,152,000	4,737,000	4,152,000	4,737,000
Loans, recorded principle balance	3,405,000	4,087,000	3,405,000	4,087,000
Related allowance	922,000	1,030,000	922,000	1,030,000
Loans, average recorded principle balance	$ 3,459,000	$ 3,075,000	$ 3,516,000	$ 2,765,000