Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	$ 375,928	$ 383,665
Gross Unrealized Gains	6,777	4,003
Gross Unrealized Losses	3,715	9,535
Estimated Fair Value	378,990	378,133	335,779
US Government Agencies Debt Securities [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	43,772	46,640
Gross Unrealized Gains	715	843
Gross Unrealized Losses	99	148
Estimated Fair Value	44,388	47,335
Residential Mortgage Backed Securities [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	222,289	234,206
Gross Unrealized Gains	1,715	1,143
Gross Unrealized Losses	3,101	6,675
Estimated Fair Value	220,903	228,674
Municipal Bond [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	109,471	102,423
Gross Unrealized Gains	4,347	2,017
Gross Unrealized Losses	506	2,700
Estimated Fair Value	113,312	101,740
Equity Investment Other [Member]
Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale [Line Items]
Amortized Cost	396	396
Gross Unrealized Losses	9	12
Estimated Fair Value	$ 387	$ 384