Note 4 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities available for sale, amortized cost	$ 259,456	$ 185,991
Securities available for sale, gross unrealized gains	913	1,547
Securities available for sale, gross unrealized losses	4,525	787
Securities available for sale, at fair value	255,844	186,751
Securities-held to maturity	2	4
Securities held to maturity, gross unrealized gains	0	0
Securities held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	2	4
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale, amortized cost	110,493	42,158
Securities available for sale, gross unrealized gains	93	123
Securities available for sale, gross unrealized losses	2,349	271
Securities available for sale, at fair value	108,237	42,010
Securities-held to maturity	2	4
Securities held to maturity, gross unrealized gains	0	0
Securities held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	2	4
Agency Collateralized Mortgage Obligations [Member]
Securities available for sale, amortized cost	16,293	9,391
Securities available for sale, gross unrealized gains	23	41
Securities available for sale, gross unrealized losses	288	101
Securities available for sale, at fair value	16,028	9,331
US Government Agencies Debt Securities [Member]
Securities available for sale, amortized cost	69,407	84,797
Securities available for sale, gross unrealized gains	14	11
Securities available for sale, gross unrealized losses	759	355
Securities available for sale, at fair value	68,662	84,453
Municipal Notes [Member]
Securities available for sale, amortized cost	63,189	49,527
Securities available for sale, gross unrealized gains	783	1,372
Securities available for sale, gross unrealized losses	1,129	60
Securities available for sale, at fair value	62,843	50,839
Debt Securities [Member]
Securities available for sale, amortized cost	259,382	185,873
Securities available for sale, gross unrealized gains	913	1,547
Securities available for sale, gross unrealized losses	4,525	787
Securities available for sale, at fair value	255,770	186,633
Securities-held to maturity	2
Securities held to maturity, fair value	2
Mutual Funds [Member]
Securities available for sale, amortized cost	74	118
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	0	0
Securities available for sale, at fair value	$ 74	$ 118

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
-Name Accounting Standards Codification
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