Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	$ 334,326	$ 83,590
Less than 12 Months, Unrealized Losses	9,303	498
12 Months or More, Fair Value	48,069	4,994
12 Months or More, Unrealized Losses	3,609	856
Total, Fair Value	382,395	88,584
Total, Unrealized Losses	12,912	1,354
US Government-sponsored Enterprises Debt Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	65,094	26,433
Less than 12 Months, Unrealized Losses	2,434	66
12 Months or More, Fair Value	11,830	0
12 Months or More, Unrealized Losses	721	0
Total, Fair Value	76,924	26,433
Total, Unrealized Losses	3,155	66
US States and Political Subdivisions Debt Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	48,715	17,199
Less than 12 Months, Unrealized Losses	1,594	174
12 Months or More, Fair Value	15,095	0
12 Months or More, Unrealized Losses	803	0
Total, Fair Value	63,810	17,199
Total, Unrealized Losses	2,397	174
Residential Mortgage Backed Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	219,032	39,659
Less than 12 Months, Unrealized Losses	5,199	256
12 Months or More, Fair Value	16,306	0
12 Months or More, Unrealized Losses	1,033	0
Total, Fair Value	235,338	39,659
Total, Unrealized Losses	6,232	256
Commercial Mortgage Backed Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	689
Less than 12 Months, Unrealized Losses	59
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total, Fair Value	689
Total, Unrealized Losses	59
Corporate Debt Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	80	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	4,816	4,994
12 Months or More, Unrealized Losses	1,049	856
Total, Fair Value	4,896	4,994
Total, Unrealized Losses	1,049	856
Mutual Funds And Equity Securities [Member]
Note 2 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized in Income [Line Items]
Less than 12 Months, Fair Value	716	299
Less than 12 Months, Unrealized Losses	17	2
12 Months or More, Fair Value	22	0
12 Months or More, Unrealized Losses	3	0
Total, Fair Value	738	299
Total, Unrealized Losses	$ 20	$ 2