Note 4 - Securities (Tables)

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

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

	As of March 31, 2016
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
(Amounts in thousands)	Cost		Gain		Loss			Fair Value
Available-for-sale securities:
U.S. government & agencies	$	3,841	$	74	$	—		$	3,915
Obligations of state and political subdivisions		59,315		1,998		(25	)		61,288
Residential mortgage backed securities and collateralized mortgage obligations		51,830		229		(338	)		51,721
Corporate securities		23,841		210		(287	)		23,764
Commercial mortgage backed securities		14,690		11		(130	)		14,571
Other asset backed securities		19,021		94		(123	)		18,992
Total	$	172,538	$	2,616	$	(903	)	$	174,251
Held-to-maturity securities:
Obligations of state and political subdivisions	$	35,357	$	1,206	$	(109	)	$	36,454

	As of December 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
(Amounts in thousands)	Cost		Gain		Loss			Fair Value
Available-for-sale securities:
U.S. government & agencies	$	3,886	$	57	$	—		$	3,943
Obligations of state and political subdivisions		59,332		1,811		(39	)		61,104
Residential mortgage backed securities and collateralized mortgage obligations		32,215		192		(270	)		32,137
Corporate securities		33,775		194		(191	)		33,778
Commercial mortgage backed securities		12,893		10		(134	)		12,769
Other asset backed securities		15,331		82		(114	)		15,299
Total	$	157,432	$	2,346	$	(748	)	$	159,030
Held-to-maturity securities:
Obligations of state and political subdivisions	$	35,899	$	966	$	(220	)	$	36,645

Amortized Cost and Estimated Fair Value Available for Sale Securities Table [Text Block]

	Available-For-Sale				Held-To-Maturity
(Amounts in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Amounts maturing in:
One year or less	$	4,455	$	4,464	$	—	$	—
One year through five years		64,660		64,920		1,530		1,574
Five years through ten years		46,566		47,647		16,465		17,080
After ten years		56,857		57,220		17,362		17,800
Total	$	172,538	$	174,251	$	35,357	$	36,454

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

(Amounts in thousands)	Pledged		Available To Be Pledged		Total Held For Pledging Purposes
Public funds collateral	$	18,286	$	10,523	$	28,809
Federal Home Loan Bank of San Francisco borrowings		—		19,026		19,026
Total	$	18,286	$	29,549	$	47,835

Schedule of Realized Gain (Loss) [Table Text Block]

	Three Months Ended March 31,
(Amounts in thousands)	2016			2015
Proceeds from sales of securities	$	19,934		$	25,215
Gross realized gains on sales of securities:
Obligations of state and political subdivisions	$	72		$	32
Residential mortgage backed securities and collateralized mortgage obligations		—			13
Corporate securities		42			82
Commercial mortgage backed securities		4			4
Other asset backed securities		1			93
Total gross realized gains on sales of securities		119			224
Gross realized losses on sales of securities:
Residential mortgage backed securities and collateralized mortgage obligations		—			(9	)
Corporate securities		(25	)		—
Total gross realized losses on sales of securities		(25	)		(9	)
Gain on investment securities, net	$	94		$	215

Schedule of Unrealized Loss on Investments [Table Text Block]

	As of March 31, 2016
	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
(Amounts in thousands)	Value		Losses			Value		Losses			Value		Losses
Available-for-sale securities:
Obligations of states and political subdivisions	$	5,620	$	(25	)	$	—	$	—		$	5,620	$	(25	)
Residential mortgage backed securities and collateralized mortgage obligations		21,511		(173	)		7,593		(165	)		29,104		(338	)
Corporate securities		10,330		(287	)		—		—			10,330		(287	)
Commercial mortgage backed securities		9,880		(88	)		1,543		(42	)		11,423		(130	)
Other asset backed securities		9,594		(23	)		2,043		(100	)		11,637		(123	)
Total temporarily impaired securities	$	56,935	$	(596	)	$	11,179	$	(307	)	$	68,114	$	(903	)
Held-to-maturity securities:
Obligations of states and political subdivisions	$	2,205	$	(8	)	$	3,024	$	(101	)	$	5,229	$	(109	)

	As of December 31, 2015
	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
(Amounts in thousands)	Value		Loss			Value		Loss			Value		Loss
Available-for-sale securities:
Obligations of states and political subdivisions	$	7,682	$	(39	)	$	—	$	—		$	7,682	$	(39	)
Residential mortgage backed securities and collateralized mortgage obligations		16,279		(210	)		4,931		(60	)		21,210		(270	)
Corporate securities		18,707		(191	)		—		—			18,707		(191	)
Commercial mortgage backed securities		7,557		(62	)		1,516		(72	)		9,073		(134	)
Other asset backed securities		4,734		(13	)		3,430		(101	)		8,164		(114	)
Total temporarily impaired securities	$	54,959	$	(515	)	$	9,877	$	(233	)	$	64,836	$	(748	)
Held-to-maturity securities:
Obligations of states and political subdivisions	$	1,513	$	(63	)	$	4,831	$	(157	)	$	6,344	$	(220	)