Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	$ 23,433	$ 334,326
Less than 12 Months, Unrealized Losses	66	9,303
12 Months or More, Fair Value	206,029	48,069
12 Months or More, Unrealized Losses	4,273	3,609
Total, Fair Value	229,462	382,395
Total, Unrealized Losses	4,339	12,912
US Government-sponsored Enterprises Debt Securities [Member]
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	3,391	65,094
Less than 12 Months, Unrealized Losses	12	2,434
12 Months or More, Fair Value	66,769	11,830
12 Months or More, Unrealized Losses	1,291	721
Total, Fair Value	70,160	76,924
Total, Unrealized Losses	1,303	3,155
US States and Political Subdivisions Debt Securities [Member]
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	9,739	48,715
Less than 12 Months, Unrealized Losses	17	1,594
12 Months or More, Fair Value	31,756	15,095
12 Months or More, Unrealized Losses	569	803
Total, Fair Value	41,495	63,810
Total, Unrealized Losses	586	2,397
Residential Mortgage Backed Securities [Member]
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	10,303	219,032
Less than 12 Months, Unrealized Losses	37	5,199
12 Months or More, Fair Value	101,240	16,306
12 Months or More, Unrealized Losses	1,908	1,033
Total, Fair Value	111,543	235,338
Total, Unrealized Losses	1,945	6,232
Commercial Mortgage Backed Securities [Member]
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	0	689
Less than 12 Months, Unrealized Losses	0	59
12 Months or More, Fair Value	715	0
12 Months or More, Unrealized Losses	26	0
Total, Fair Value	715	689
Total, Unrealized Losses	26	59
Corporate Debt Securities [Member]
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	0	80
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Fair Value	5,395	4,816
12 Months or More, Unrealized Losses	478	1,049
Total, Fair Value	5,395	4,896
Total, Unrealized Losses	478	1,049
Mutual Funds And Equity Securities [Member]
Note 6 - Investment Securities (Details) - Investment Securities With Unrealized Losses Not Recognized In Income [Line Items]
Less than 12 Months, Fair Value	0	716
Less than 12 Months, Unrealized Losses	0	17
12 Months or More, Fair Value	154	22
12 Months or More, Unrealized Losses	1	3
Total, Fair Value	154	738
Total, Unrealized Losses	$ 1	$ 20