Note 6 - Deposits (Details) - Summary of Deposits - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Summary of Deposits [Abstract]
Noninterest-bearing checking (in Dollars)	$ 612,222,000	$ 558,738,000
Noninterest-bearing checking	26.90%	24.50%
Noninterest-bearing checking	9.60%
Interest-bearing checking (in Dollars)	$ 393,933,000	$ 413,382,000
Interest-bearing checking	17.30%	18.20%
Interest-bearing checking	(4.70%)
Money market (in Dollars)	$ 272,225,000	$ 235,587,000
Money market	12.00%	10.30%
Money market	15.60%
Savings (in Dollars)	$ 347,292,000	$ 330,459,000
Savings	15.20%	14.50%
Savings	5.10%
Time, under $100,000 (in Dollars)	$ 170,104,000	$ 181,026,000
Time, under $100,000	7.50%	8.00%
Time, under $100,000	(6.00%)
Time, $100,000 and over (in Dollars)	$ 347,148,000	$ 382,120,000
Time, $100,000 and over	15.20%	16.80%
Time, $100,000 and over	(9.20%)
(in Dollars)	$ 2,142,924,000	$ 2,101,312,000
	94.10%	92.30%
	2.00%
Out-of-area time, under $100,000 (in Dollars)	$ 842,000	$ 2,422,000
Out-of-area time, under $100,000		0.10%
Out-of-area time, under $100,000	(65.20%)
Out-of-area time, $100,000 and over (in Dollars)	$ 135,028,000	$ 173,181,000
Out-of-area time, $100,000 and over	5.90%	7.60%
Out-of-area time, $100,000 and over	(22.00%)
(in Dollars)	$ 135,870,000	$ 175,603,000
	5.90%	7.70%
	(22.60%)
Total deposits (in Dollars)	$ 2,278,794,000	$ 2,276,915,000
Total deposits	100.00%	100.00%
Total deposits	0.10%