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Note 4 - Investment Securities Available-for-sale (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

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

			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

			Gross		Gross		Estimated
December 31, 2014	Amortized		Unrealized		Unrealized		Fair
(dollars in thousands)	Cost		Gains		Losses		Value
U. S. agency securities	$	29,434	$	500	$	40	$	29,894
Residential mortgage backed securities		241,120		1,716		2,516		240,320
Municipal bonds		106,983		4,850		121		111,712
Other equity investments		396		21		-		417
	$	377,933	$	7,087	$	2,677	$	382,343

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than				12 Months
	12 Months				or Greater				Total
	Estimated				Estimated				Estimated
December 31, 2015	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(dollars in thousands)	Value		Losses		Value		Losses		Value		Losses
U. S. Government 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

	Less than				12 Months
	12 Months				or Greater				Total
	Estimated				Estimated				Estimated
December 31, 2014	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(dollars in thousands)	Value		Losses		Value		Losses		Value		Losses
U. S. agency securities	$	2,001	$	7	$	1,750	$	33	$	3,751	$	40
Residential mortgage backed securities		49,644		221		86,028		2,295		135,672		2,516
Municipal bonds		4,974		14		10,915		107		15,889		121
	$	56,619	$	242	$	98,693	$	2,435	$	155,312	$	2,677

Available-for-sale Securities [Table Text Block]

	December 31, 2015				December 31, 2014
	Amortized		Estimated		Amortized		Estimated
(dollars in thousands)	Cost		Fair Value		Cost		Fair Value
U. S. agency securities maturing:
One year or less	$	31,436	$	31,361	$	2,998	$	3,051
After one year through five years		18,826		19,047		19,947		20,276
Five years through ten years		6,513		6,567		6,489		6,567
Residential mortgage backed securities		299,709		297,241		241,120		240,320
Municipal bonds maturing:
One year or less		4,450		4,478		2,410		2,438
After one year through five years		41,213		43,720		47,038		49,607
Five years through ten years		66,001		67,398		54,983		56,927
After ten years		2,589		2,785		2,552		2,740
Corporate bonds
After one year through five years		15,090		14,938		-		-
Other equity investments		307		334		396		417
	$	486,134	$	487,869	$	377,933	$	382,343

- 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