Note 21 - Quarterly Results of Operations (Details) - Quarterly Results of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Note 21 - Quarterly Results of Operations (Details) - Quarterly Results of Operations [Line Items]
Total interest income	$ 157,294		$ 141,943		$ 119,124
Total interest expense	12,504		14,414		20,077
Net interest income	144,790		127,529		99,047
Net interest income after provision for credit losses	135,188		111,339		88,064
Noninterest income	24,716		21,364		13,501
Noninterest expense	84,579		76,531		63,276
Income before income tax expense	75,325		56,172		38,289
Income tax expense	28,318		20,883		13,731
Net income	47,007		35,289		24,558
Preferred stock dividends and discount accretion	566		566		1,511
Net income available to common shareholders	46,441		34,723		23,047
Earnings per common share
Basic (in Dollars per share)	$ 1.81		$ 1.50		$ 1.05
Diluted (in Dollars per share)	$ 1.76		$ 1.46		$ 1.04
Fourth Quarter [Member]
Note 21 - Quarterly Results of Operations (Details) - Quarterly Results of Operations [Line Items]
Total interest income	41,652		38,164		33,091
Total interest expense	2,938		3,427		4,820
Net interest income	38,714		34,737		28,271
Provision for credit losses	2,508		4,139		2,765
Net interest income after provision for credit losses	36,206		30,598		25,506
Noninterest income	4,304		6,060		3,864
Noninterest expense	21,524		20,325		18,307
Income before income tax expense	18,986		16,333		11,063
Income tax expense	6,983		6,135		3,889
Net income	12,003		10,198		7,174
Preferred stock dividends and discount accretion	141		141		142
Net income available to common shareholders	11,862		10,057		7,032
Earnings per common share
Basic (in Dollars per share)	$ 0.46	[1],[2]	$ 0.40	[1],[2]	$ 0.32	[1],[2]
Diluted (in Dollars per share)	$ 0.45	[1],[2]	$ 0.39	[1],[2]	$ 0.32	[1],[2]
Third Quarter [Member]
Note 21 - Quarterly Results of Operations (Details) - Quarterly Results of Operations [Line Items]
Total interest income	39,724		36,636		30,741
Total interest expense	3,021		3,328		5,365
Net interest income	36,703		33,308		25,376
Provision for credit losses	1,372		3,638		2,887
Net interest income after provision for credit losses	35,331		29,670		22,489
Noninterest income	5,236		4,851		3,511
Noninterest expense	21,673		19,107		15,723
Income before income tax expense	18,894		15,414		10,277
Income tax expense	7,137		5,739		3,783
Net income	11,757		9,675		6,494
Preferred stock dividends and discount accretion	142		142		166
Net income available to common shareholders	11,615		9,533		6,328
Earnings per common share
Basic (in Dollars per share)	$ 0.45	[1],[2]	$ 0.41	[1],[2]	$ 0.29	[1],[2]
Diluted (in Dollars per share)	$ 0.44	[1],[2]	$ 0.40	[1],[2]	$ 0.28	[1],[2]
Second Quarter [Member]
Note 21 - Quarterly Results of Operations (Details) - Quarterly Results of Operations [Line Items]
Total interest income	37,985		34,575		28,996
Total interest expense	3,121		3,561		5,102
Net interest income	34,864		31,014		23,894
Provision for credit losses	2,357		4,443		3,215
Net interest income after provision for credit losses	32,507		26,571		20,679
Noninterest income	7,065		4,441		3,193
Noninterest expense	20,685		18,537		14,933
Income before income tax expense	18,887		12,475		8,939
Income tax expense	7,212		4,692		3,185
Net income	11,675		7,783		5,754
Preferred stock dividends and discount accretion	142		142		883
Net income available to common shareholders	11,533		7,641		4,871
Earnings per common share
Basic (in Dollars per share)	$ 0.45	[1],[2]	$ 0.34	[1],[2]	$ 0.23	[1],[2]
Diluted (in Dollars per share)	$ 0.44	[1],[2]	$ 0.33	[1],[2]	$ 0.22	[1],[2]
First Quarter [Member]
Note 21 - Quarterly Results of Operations (Details) - Quarterly Results of Operations [Line Items]
Total interest income	37,933		32,568		26,296
Total interest expense	3,424		4,098		4,790
Net interest income	34,509		28,470		21,506
Provision for credit losses	3,365		3,970		2,116
Net interest income after provision for credit losses	31,144		24,500		19,390
Noninterest income	8,111		6,012		2,933
Noninterest expense	20,697		18,562		14,313
Income before income tax expense	18,558		11,950		8,010
Income tax expense	6,986		4,317		2,874
Net income	11,572		7,633		5,136
Preferred stock dividends and discount accretion	141		141		320
Net income available to common shareholders	$ 11,431		$ 7,492		$ 4,816
Earnings per common share
Basic (in Dollars per share)	$ 0.45	[1],[2]	$ 0.34	[1],[2]	$ 0.22	[1],[2]
Diluted (in Dollars per share)	$ 0.44	[1],[2]	$ 0.33	[1],[2]	$ 0.22	[1],[2]

[1] Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.

[2] Per share amounts have been adjusted to give effect to the 10% common stock dividend paid on June 14, 2013.