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	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 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	$ 358,103	$ 290,712
Gross Unrealized Gains	4,853	9,521
Gross Unrealized Losses	7,126	413
Estimated Fair Value	355,830	299,820	296,363
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	41,729	47,606
Gross Unrealized Gains	969	1,477
Gross Unrealized Losses	143	1
Estimated Fair Value	42,555	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	223,216	170,649
Gross Unrealized Gains	1,423	2,730
Gross Unrealized Losses	4,649	296
Estimated Fair Value	219,990	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	92,746	72,050
Gross Unrealized Gains	2,461	5,314
Gross Unrealized Losses	2,308	51
Estimated Fair Value	92,899	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	26	65
Estimated Fair Value	$ 386	$ 342