Note 24 - Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	Summary of Operations
	2015												2014
	Fourth			Third			Second			First			Fourth			Third			Second			First
	Quarter			Quarter			Quarter			Quarter			Quarter			Quarter			Quarter			Quarter
	(In thousands, except per share data)
Interest income	$	119,519		$	116,867		$	112,386		$	104,934		$	106,043		$	106,335		$	105,062		$	101,207
Interest expense		20,103			19,221			17,632			17,008			18,292			19,580			19,445			18,549
Net interest income		99,416			97,646			94,754			87,926			87,751			86,755			85,617			82,658
Reversal for credit losses		(3,000	)		(1,250	)		(2,150	)		(5,000	)		(2,000	)		(5,100	)		(3,700	)		-
Net-interest income after provision for loan losses		102,416			98,896			96,904			92,926			89,751			91,855			89,317			82,658
Non-interest income		9,350			9,156			5,619			8,549			7,973			8,974			9,021			14,559
Non-interest expense		53,533			57,471			47,585			44,131			41,125			42,607			42,513			48,068
Income before income tax expense		58,233			50,581			54,938			57,344			56,599			58,222			55,825			49,149
Income tax expense		16,787			12,098			9,738			21,364			21,021			22,313			20,741			17,890
Net income	$	41,446		$	38,483		$	45,200		$	35,980		$	35,578		$	35,909		$	35,084		$	31,259
Net income per common share
Basic	$	0.51		$	0.47		$	0.57		$	0.45		$	0.45		$	0.45		$	0.44		$	0.39
Diluted	$	0.51		$	0.47		$	0.56		$	0.45		$	0.44		$	0.45		$	0.44		$	0.39