Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale [Line Items]
Amortized Cost	$ 337,291	$ 290,712
Gross Unrealized Gains	4,922	9,521
Gross Unrealized Losses	6,434	413
Estimated Fair Value	335,779	299,820	338,933
US Government Agencies Debt Securities [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale [Line Items]
Amortized Cost	38,818	47,606
Gross Unrealized Gains	832	1,477
Gross Unrealized Losses	152	1
Estimated Fair Value	39,498	49,082
Residential Mortgage Backed Securities [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale [Line Items]
Amortized Cost	211,079	170,649
Gross Unrealized Gains	1,491	2,730
Gross Unrealized Losses	4,131	296
Estimated Fair Value	208,439	173,083
Municipal Bond [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale [Line Items]
Amortized Cost	86,982	72,050
Gross Unrealized Gains	2,599	5,314
Gross Unrealized Losses	2,112	51
Estimated Fair Value	87,469	77,313
Equity Investment Other [Member]
Note 3 - Investment Securities Available for Sale (Details) - Amortized Cost And Estimated Fair Value Of Securities Available For Sale [Line Items]
Amortized Cost	412	407
Gross Unrealized Gains	0	0
Gross Unrealized Losses	39	65
Estimated Fair Value	$ 373	$ 342