Note 22 - Parent Company Only Financial Information (Details) - Condensed Statements of Income for the Holding Company: (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]
Interest income									$ 25,969	$ 28,310	$ 31,306
Interest expense	(12,057)	(17,220)	(12,740)	(12,724)	(13,058)	(12,866)	(12,999)	(15,940)	(54,741)	(54,863)	(63,275)
Gain on sale of securities									2,875	3,021	47
Net gain (loss) from fair value adjustments									(2,568)	(2,521)	55
Other operating expenses									(11,809)	(10,634)	(11,450)
Income tax benefit	6,988	7,060	7,598	6,927	6,458	6,024	6,155	4,319	28,573	22,956	21,847
Net income	11,057	11,201	11,685	10,296	11,948	9,421	9,627	6,756	44,239	37,752	34,331
Holding Company [Member]
Condensed Income Statements, Captions [Line Items]
Dividends from the Bank									20,000	20,000	20,000
Interest income									512	590	694
Interest expense									(1,039)	(1,066)	(2,957)
Gain on sale of securities										17
Net gain (loss) from fair value adjustments									779	(5,475)	1,991
Other operating expenses									(786)	(621)	(730)
Income before taxes and equity in undistributed earnings of subsidiary									19,466	13,445	18,998
Income tax benefit									668	2,857	498
Income before equity in undistributed earnings of subsidiary									20,134	16,302	19,496
Equity in undistributed earnings of the Bank									24,105	21,450	14,835
Net income									$ 44,239	$ 37,752	$ 34,331