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

9 Months Ended

Sep. 30, 2016

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

			Gross		Gross		Estimated
September 30, 2016	Amortized		Unrealized		Unrealized		Fair
(dollars in thousands)	Cost		Gains		Losses		Value
U. S. agency securities	$	55,862	$	638	$	136	$	56,364
Residential mortgage backed securities		264,101		2,284		350		266,035
Municipal bonds		94,923		4,954		-		99,877
Corporate bonds		8,009		68		23		8,054
Other equity investments		310		28		-		338
	$	423,205	$	7,972	$	509	$	430,668

			Gross		Gross		Estimated
December 31, 2015	Amortized		Unrealized		Unrealized		Fair
(dollars in thousands)	Cost		Gains		Losses		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
			Estimated				Estimated				Estimated
September 30, 2016	Number of		Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(dollars in thousands)	Securities		Value		Losses		Value		Losses		Value		Losses
U. S. agency securities		14	$	38,625	$	107	$	1,986	$	29	$	40,611	$	136
Residential mortgage backed securities		38		57,588		162		20,789		188		78,377		350
Corporate bonds		2		4,986		23		-		-		4,986		23
		54	$	101,199	$	292	$	22,775	$	217	$	123,974	$	509

			Less than				12 Months
			12 Months				or Greater				Total
			Estimated				Estimated				Estimated
December 31, 2015	Number of		Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(dollars in thousands)	Securities		Value		Losses		Value		Losses		Value		Losses
U. S. agency securities		13	$	32,927	$	277	$	-	$	-	$	32,927	$	277
Residential mortgage backed securities		92		157,871		1,438		58,954		1,722		216,825		3,160
Municipal bonds		2		1,559		3		-		-		1,559		3
Corporate bonds		4		14,938		152		-		-		14,938		152
		111	$	207,295	$	1,870	$	58,954	$	1,722	$	266,249	$	3,592

Available-for-sale Securities [Table Text Block]

	September 30, 2016				December 31, 2015
	Amortized		Estimated		Amortized		Estimated
(dollars in thousands)	Cost		Fair Value		Cost		Fair Value
U. S. agency securities maturing:
One year or less	$	37,414	$	37,380	$	31,436	$	31,361
After one year through five years		18,448		18,984		18,826		19,047
Five years through ten years		-		-		6,513		6,567
Residential mortgage backed securities		264,101		266,035		299,709		297,241
Municipal bonds maturing:
One year or less		1,057		1,080		4,450		4,478
After one year through five years		42,625		44,701		41,213		43,720
Five years through ten years		50,165		52,868		66,001		67,398
After ten years		1,076		1,228		2,589		2,785
Corporate bonds
After one year through five years		5,009		4,986		15,090		14,938
Five years through ten years		3,000		3,068		-		-
Other equity investments		310		338		307		334
	$	423,205	$	430,668	$	486,134	$	487,869

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details