Note 3 - Investment Securities Available for Sale (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

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

March 31, 2014	Amortized		Gross Unrealized		Gross Unrealized		Estimated Fair
(dollars in thousands)	Cost		Gains		Losses		Value
U. S. Government agency securities	$	48,797	$	687	$	127	$	49,357
Residential mortgage backed securities		232,001		1,292		4,682		228,611
Municipal bonds		107,434		3,136		1,165		109,405
Other equity investments		396		21		-		417
	$	388,628	$	5,136	$	5,974	$	387,790

December 31, 2013	Amortized		Gross Unrealized		Gross Unrealized		Estimated Fair
(dollars in thousands)	Cost		Gains		Losses		Value
U. S. Government agency securities	$	46,640	$	843	$	148	$	47,335
Residential mortgage backed securities		234,206		1,143		6,675		228,674
Municipal bonds		102,423		2,017		2,700		101,740
Other equity investments		396		-		12		384
	$	383,665	$	4,003	$	9,535	$	378,133

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than				12 Months
	12 Months				or Greater				Total
	Estimated				Estimated				Estimated
March 31, 2014	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(dollars in thousands)	Value		Losses		Value		Losses		Value		Losses
U. S. Government agency securities	$	8,624	$	127	$	-	$	-	$	8,624	$	127
Residential mortgage backed securities		129,067		3,548		31,128		1,134		160,195		4,682
Municipal bonds		26,547		794		8,076		371		34,623		1,165
	$	164,238	$	4,469	$	39,204	$	1,505	$	203,442	$	5,974

	Less than				12 Months
	12 Months				or Greater				Total
	Estimated				Estimated				Estimated
December 31, 2013	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(dollars in thousands)	Value		Losses		Value		Losses		Value		Losses
U. S. Government agency securities	$	4,782	$	148	$	-	$	-	$	4,782	$	148
Residential mortgage backed securities		155,475		5,992		15,658		683		171,133		6,675
Municipal bonds		50,450		2,512		3,196		188		53,646		2,700
Other equity investments		-		-		165		12		165		12
	$	210,707	$	8,652	$	19,019	$	883	$	229,726	$	9,535

Available-for-sale Securities [Table Text Block]

	March 31, 2014				December 31, 2013
	Amortized		Estimated		Amortized		Estimated
(dollars in thousands)	Cost		Fair Value		Cost		Fair Value
U. S. Government agency securities maturing:
One year or less	$	19,012	$	19,063	$	19,025	$	19,133
After one year through five years		27,321		27,781		27,615		28,202
Five years through ten years		2,464		2,513		-		-
Residential mortgage backed securities		232,001		228,611		234,206		228,674
Municipal bonds maturing:
After one year through five years		31,725		32,598		25,718		26,008
Five years through ten years		75,709		76,807		76,705		75,732
Other equity investments		396		417		396		384
	$	388,628	$	387,790	$	383,665	$	378,133