Note 11 - Operating Segment Information (Detail) - Selected Operating Segment Information (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Total interest income	$ 16,029,000	$ 16,768,000	$ 48,608,000	$ 50,956,000
Total interest expense	2,381,000	3,243,000	7,671,000	10,483,000
Net interest income	13,648,000	13,525,000	40,937,000	40,473,000
Provision for loan losses	(300,000)	875,000	300,000	2,450,000
Net interest income after provision for loan losses	13,948,000	12,650,000	40,637,000	38,023,000
Noninterest income	1,872,000	1,816,000	5,435,000	5,046,000
Noninterest expenses	11,529,000	11,435,000	33,774,000	33,221,000
Income before income tax provision	4,291,000	3,031,000	12,298,000	9,848,000
Provision (benefit) for income taxes	1,410,000	762,000	4,023,000	3,090,000
Net income (loss)	2,881,000	2,269,000	8,275,000	6,758,000
Net loans	1,071,313,000		1,071,313,000		1,015,095,000
Total assets	1,526,088,000		1,526,088,000		1,494,531,000
Deposits	1,265,057,000		1,265,057,000		1,251,575,000
MetroBank [Member]
Total interest income	11,926,000	12,680,000	36,483,000	38,370,000
Total interest expense	1,483,000	2,147,000	4,834,000	7,075,000
Net interest income	10,443,000	10,533,000	31,649,000	31,295,000
Provision for loan losses	(300,000)	550,000	300,000	2,050,000
Net interest income after provision for loan losses	10,743,000	9,983,000	31,349,000	29,245,000
Noninterest income	2,126,000	2,092,000	6,188,000	5,841,000
Noninterest expenses	8,281,000	8,539,000	25,143,000	25,037,000
Income before income tax provision	4,588,000	3,536,000	12,394,000	10,049,000
Provision (benefit) for income taxes	1,449,000	915,000	3,921,000	3,008,000
Net income (loss)	3,139,000	2,621,000	8,473,000	7,041,000
Net loans	759,904,000	737,313,000	759,904,000	737,313,000
Total assets	1,128,652,000	1,110,963,000	1,128,652,000	1,110,963,000
Deposits	946,206,000	939,206,000	946,206,000	939,206,000
Metro United [Member]
Total interest income	4,096,000	4,081,000	12,104,000	12,567,000
Total interest expense	548,000	757,000	1,793,000	2,395,000
Net interest income	3,548,000	3,324,000	10,311,000	10,172,000
Provision for loan losses		325,000		400,000
Net interest income after provision for loan losses	3,458,000	2,999,000	10,311,000	9,772,000
Noninterest income	84,000	55,000	260,000	198,000
Noninterest expenses	2,870,000	2,850,000	8,043,000	8,095,000
Income before income tax provision	762,000	204,000	2,528,000	1,875,000
Provision (benefit) for income taxes	321,000	83,000	995,000	776,000
Net income (loss)	441,000	121,000	1,533,000	1,099,000
Net loans	311,409,000	291,883,000	311,409,000	291,883,000
Total assets	396,019,000	388,897,000	396,019,000	388,897,000
Deposits	325,646,000	315,577,000	325,646,000	315,577,000
Other Segments [Member]
Total interest income	7,000	7,000	21,000	19,000
Total interest expense	350,000	339,000	1,044,000	1,013,000
Net interest income	(343,000)	(332,000)	(1,023,000)	(994,000)
Net interest income after provision for loan losses	(343,000)	(332,000)	(1,023,000)	(994,000)
Noninterest income	(338,000)	(331,000)	(1,013,000)	(993,000)
Noninterest expenses	378,000	46,000	588,000	89,000
Income before income tax provision	(1,059,000)	(709,000)	(2,624,000)	(2,076,000)
Provision (benefit) for income taxes	(360,000)	(236,000)	(893,000)	(694,000)
Net income (loss)	(699,000)	(473,000)	(1,731,000)	(1,382,000)
Total assets	1,417,000	(2,080,000)	1,417,000	(2,080,000)
Deposits	(6,795,000)	(13,291,000)	(6,795,000)	(13,291,000)
Consolidated Company [Member]
Total interest income	16,029,000	16,768,000	48,608,000	50,956,000
Total interest expense	2,381,000	3,243,000	7,671,000	10,483,000
Net interest income	13,648,000	13,525,000	40,937,000	40,473,000
Provision for loan losses	(300,000)	875,000	300,000	2,450,000
Net interest income after provision for loan losses	13,948,000	12,650,000	40,637,000	38,023,000
Noninterest income	1,872,000	1,816,000	5,435,000	5,046,000
Noninterest expenses	11,529,000	11,435,000	33,774,000	33,221,000
Income before income tax provision	4,291,000	3,031,000	12,298,000	9,848,000
Provision (benefit) for income taxes	1,410,000	762,000	4,023,000	3,090,000
Net income (loss)	2,881,000	2,269,000	8,275,000	6,758,000
Net loans	1,071,313,000	1,029,196,000	1,071,313,000	1,029,196,000
Total assets	1,526,088,000	1,497,780,000	1,526,088,000	1,497,780,000
Deposits	$ 1,265,057,000	$ 1,241,492,000	$ 1,265,057,000	$ 1,241,492,000