Note 3 - Investment Securities Available-for-Sale (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

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

March 31, 2016 (dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U. S. agency securities	$	54,948	$	774	$	100	$	55,622
Residential mortgage backed securities		305,351		2,073		612		306,812
Municipal bonds		104,840		5,069		-		109,909
Corporate bonds		15,085		-		147		14,938
Other equity investments		310		18		-		328
	$	480,534	$	7,934	$	859	$	487,609

December 31, 2015 (dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
U. S. agency securities	$	56,775	$	477	$	277	$	56,975
Residential mortgage backed securities		299,709		692		3,160		297,241
Municipal bonds		114,253		4,131		3		118,381
Corporate bonds		15,090		-		152		14,938
Other equity investments		307		27		-		334
	$	486,134	$	5,327	$	3,592	$	487,869

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months				12 Months or Greater				Total
March 31, 2016 (dollars in thousands)	Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
U. S. agency securities	$	7,218	$	100	$	-	$	-	$	7,218	$	100
Residential mortgage backed securities		55,594		100		53,087		512		108,681		612
Municipal bonds		-		-		-		-		-		-
Corporate bonds		14,937		147		-		-		14,937		147
	$	77,749	$	347	$	53,087	$	512	$	130,836	$	859

	Less than 12 Months				12 Months or Greater				Total
December 31, 2015 (dollars in thousands)	Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
U. S. agency securities	$	32,927	$	277	$	-	$	-	$	32,927	$	277
Residential mortgage backed securities		157,871		1,438		58,954		1,722		216,825		3,160
Municipal bonds		1,559		3		-		-		1,559		3
Corporate bonds		14,938		152		-		-		14,938		152
	$	207,295	$	1,870	$	58,954	$	1,722	$	266,249	$	3,592

Available-for-sale Securities [Table Text Block]

	March 31, 2016				December 31, 2015
(dollars in thousands)	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
U. S. agency securities maturing:
One year or less	$	36,534	$	36,613	$	31,436	$	31,361
After one year through five years		13,907		14,274		18,826		19,047
Five years through ten years		4,507		4,735		6,513		6,567
Residential mortgage backed securities		305,351		306,812		299,709		297,241
Municipal bonds maturing:
One year or less		4,423		4,438		4,450		4,478
After one year through five years		41,357		43,872		41,213		43,720
Five years through ten years		56,870		59,114		66,001		67,398
After ten years		2,190		2,485		2,589		2,785
Corporate bonds
After one year through five years		15,085		14,938		15,090		14,938
Other equity investments		310		328		307		334
	$	480,534	$	487,609	$	486,134	$	487,869