Note 20 - Quarterly Financial Data (Unaudited) (Detail) - Quarterly Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income	$ 71,222	$ 78,349	$ 89,751
Interest expense	18,258	24,670	34,948
Net interest income	52,964	53,679	54,803
Net interest income after provision for loan losses	50,192	40,192	37,570
Noninterest income	24,654	24,391	34,110
Noninterest expense	59,787	62,492	62,711
Income before income taxes	15,059	2,091	8,969
Income tax expense	2,910	(647)	2,037
Net income	12,149	2,738	6,932
Less dividends and accretion on preferred shares	1,922	1,896	1,871
Net income available to common shareholders	10,227	842	5,061
Net income per common share (in Dollars per share)	$ 1.37	$ 0.11	$ 0.68
Weighted average shares outstanding, basic and diluted (in Shares)	7,457	7,424	7,390
First Quarter [Member]
Interest income	18,410	20,168
Interest expense	5,203	6,512
Net interest income	13,207	13,656
Provision for loan losses	977	2,441
Net interest income after provision for loan losses	12,230	11,215
Noninterest income	6,028	5,893
Noninterest expense	14,593	15,282
Income before income taxes	3,665	1,826
Income tax expense	356	781
Net income	3,309	1,045
Less dividends and accretion on preferred shares	478	472
Net income available to common shareholders	2,831	573
Net income per common share (in Dollars per share)	$ 0.38	$ 0.08
Weighted average shares outstanding, basic and diluted (in Shares)	7,447	7,412
Second Quarter [Member]
Interest income	18,087	20,133
Interest expense	4,720	6,311
Net interest income	13,367	13,822
Provision for loan losses	1,341	4,528
Net interest income after provision for loan losses	12,026	9,294
Noninterest income	6,412	6,340
Noninterest expense	14,401	15,507
Income before income taxes	4,037	127
Income tax expense	890	(42)
Net income	3,147	169
Less dividends and accretion on preferred shares	480	473
Net income available to common shareholders	2,667	(304)
Net income per common share (in Dollars per share)	$ 0.36	$ (0.04)
Weighted average shares outstanding, basic and diluted (in Shares)	7,454	7,420
Third Quarter [Member]
Interest income	17,578	19,493
Interest expense	4,511	6,096
Net interest income	13,067	13,397
Provision for loan losses	(256)	3,232
Net interest income after provision for loan losses	13,323	10,165
Noninterest income	6,166	6,260
Noninterest expense	15,347	16,959
Income before income taxes	4,142	(534)
Income tax expense	1,051	(806)
Net income	3,091	272
Less dividends and accretion on preferred shares	481	474
Net income available to common shareholders	2,610	(202)
Net income per common share (in Dollars per share)	$ 0.35	$ (0.03)
Weighted average shares outstanding, basic and diluted (in Shares)	7,461	7,427
Fourth Quarter [Member]
Interest income	17,147	18,555
Interest expense	3,824	5,751
Net interest income	13,323	12,804
Provision for loan losses	710	3,286
Net interest income after provision for loan losses	12,613	9,518
Noninterest income	6,048	5,898
Noninterest expense	15,446	14,744
Income before income taxes	3,215	672
Income tax expense	613	(580)
Net income	2,602	1,252
Less dividends and accretion on preferred shares	483	477
Net income available to common shareholders	$ 2,119	$ 775
Net income per common share (in Dollars per share)	$ 0.28	$ 0.10
Weighted average shares outstanding, basic and diluted (in Shares)	7,466	7,437