Note 3 - Investment Securities Available for Sale (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

September 30, 2013	Amortized		Gross Unrealized		Gross Unrealized		Estimated Fair
(dollars in thousands)	Cost		Gains		Losses		Value
U. S. Government agency securities	$	41,729	$	969	$	143	$	42,555
Residential mortgage backed securities		223,216		1,423		4,649		219,990
Municipal bonds		92,746		2,461		2,308		92,899
Other equity investments		412		-		26		386
	$	358,103	$	4,853	$	7,126	$	355,830

December 31, 2012	Amortized		Gross Unrealized		Gross Unrealized		Estimated Fair
(dollars in thousands)	Cost		Gains		Losses		Value
U. S. Government agency securities	$	47,606	$	1,477	$	1	$	49,082
Residential mortgage backed securities		170,649		2,730		296		173,083
Municipal bonds		72,050		5,314		51		77,313
Other equity investments		407		-		65		342
	$	290,712	$	9,521	$	413	$	299,820

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months				12 Months or Greater				Total
September 30, 2013	Estimated Fair		Unrealized		Estimated Fair		Unrealized		Estimated Fair		Unrealized
(dollars in thousands)	Value		Losses		Value		Losses		Value		Losses
U. S. Government agency securities	$	4,787	$	143	$	-	$	-	$	4,787	$	143
Residential mortgage backed securities		133,938		4,580		2,649		69		136,587		4,649
Municipal bonds		40,656		2,300		482		8		41,138		2,308
Other equity investments		-		-		151		26		151		26
	$	179,381	$	7,023	$	3,282	$	103	$	182,663	$	7,126

	Less than 12 Months				12 Months or Greater				Total
December 31, 2012	Estimated Fair		Unrealized		Estimated Fair		Unrealized		Estimated Fair		Unrealized
(dollars in thousands)	Value		Losses		Value		Losses		Value		Losses
U. S. Government agency securities	$	2,999	$	1	$	-	$	-	$	2,999	$	1
Residential mortgage backed securities		44,992		263		2,743		33		47,735		296
Municipal bonds		3,964		51		-		-		3,964		51
Other equity investments		-		-		112		65		112		65
	$	51,955	$	315	$	2,855	$	98	$	54,810	$	413

Available-for-sale Securities [Table Text Block]

	September 30, 2013				December 31, 2012
(dollars in thousands)	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
U. S. Government agency securities maturing:
One year or less	$	14,041	$	14,198	$	5,038	$	5,053
After one year through five years		27,688		28,357		42,568		44,029
Residential mortgage backed securities		223,216		219,990		170,649		173,083
Municipal bonds maturing:
After one year through five years		21,158		21,477		11,469		11,978
Five years through ten years		71,588		71,422		60,581		65,335
Other equity investments		412		386		407		342
	$	358,103	$	355,830	$	290,712	$	299,820