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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized cost maturity:
Securities available for sale, due within one year, amortized cost	$ 30,052
Securities available for sale, due after one year but within five years, amortized cost	7,193
Securities available for sale, due after five years but within ten years, amortized cost	100,653
Securities available for sale, due after ten years, amortized cost	4,297
Securities available for sale, single maturity date, amortized cost	142,195
Securities available for sale, amortized cost	164,345	$ 166,450
Fair value maturity:
Securities available for sale, due within one year, fair value	30,026
Securities available for sale, due after one year but within five years, fair value	7,308
Securities available for sale, due after five years but within ten years, fair value	102,011
Securities available for sale, due after ten years, fair value	4,454
Securities available for sale, single maturity date, fair value	143,799
Securities available for sale	165,580	165,579
Held-to-maturity, Amortized cost maturity:
Securities held to maturity, due within one year, amortized cost
Securities held to maturity, due after one year but within five years, amortized cost	25,149
Securities held to maturity, due after five years but within ten years, amortized cost
Securities held to maturity, due after ten years, amortized cost
Securities held to maturity	25,149	47,133
Held-to-maturity, Fair value maturity:
Securities held to maturity, due within one year, fair value
Securities held to maturity, due after one year but within five years, fair value	25,084
Securities held to maturity, due after five years but within ten years, fair value
Securities held to maturity, due after ten years, fair value
Securities held to maturity, fair value	25,084	47,266
Collateralized Mortgage Backed Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost	22,095
Fair value maturity:
Securities available for sale, no single maturity date, fair value	21,726
Equity Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost	55
Securities available for sale, amortized cost	55	55
Fair value maturity:
Securities available for sale, no single maturity date, fair value	55
Securities available for sale	55	$ 73
US Government Agencies Debt Securities [Member]
Amortized cost maturity:
Securities available for sale, due within one year, amortized cost	10,065
Securities available for sale, due after one year but within five years, amortized cost
Securities available for sale, due after five years but within ten years, amortized cost	1,224
Securities available for sale, due after ten years, amortized cost
Securities available for sale, single maturity date, amortized cost	11,289
Securities available for sale, amortized cost
Fair value maturity:
Securities available for sale, due within one year, fair value	10,055
Securities available for sale, due after one year but within five years, fair value
Securities available for sale, due after five years but within ten years, fair value	1,241
Securities available for sale, due after ten years, fair value
Securities available for sale, single maturity date, fair value	11,296
Securities available for sale
Held-to-maturity, Amortized cost maturity:
Securities held to maturity, due within one year, amortized cost
Securities held to maturity, due after one year but within five years, amortized cost	17,937
Securities held to maturity, due after five years but within ten years, amortized cost
Securities held to maturity, due after ten years, amortized cost
Securities held to maturity	17,937
Held-to-maturity, Fair value maturity:
Securities held to maturity, due within one year, fair value
Securities held to maturity, due after one year but within five years, fair value	17,888
Securities held to maturity, due after five years but within ten years, fair value
Securities held to maturity, due after ten years, fair value
Securities held to maturity, fair value	17,888
US Government Agencies Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
US Government Agencies Debt Securities [Member] | Equity Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
US Treasury Securities [Member]
Amortized cost maturity:
Securities available for sale, due within one year, amortized cost	19,987
Securities available for sale, due after one year but within five years, amortized cost
Securities available for sale, due after five years but within ten years, amortized cost
Securities available for sale, due after ten years, amortized cost
Securities available for sale, single maturity date, amortized cost	19,987
Securities available for sale, amortized cost
Fair value maturity:
Securities available for sale, due within one year, fair value	19,971
Securities available for sale, due after one year but within five years, fair value
Securities available for sale, due after five years but within ten years, fair value
Securities available for sale, due after ten years, fair value
Securities available for sale, single maturity date, fair value	19,971
Securities available for sale
US Treasury Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
US Treasury Securities [Member] | Equity Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
Nontaxable Municipal Bonds [Member]
Amortized cost maturity:
Securities available for sale, due within one year, amortized cost
Securities available for sale, due after one year but within five years, amortized cost	7,193
Securities available for sale, due after five years but within ten years, amortized cost	90,062
Securities available for sale, due after ten years, amortized cost	4,297
Securities available for sale, single maturity date, amortized cost	101,552
Securities available for sale, amortized cost
Fair value maturity:
Securities available for sale, due within one year, fair value
Securities available for sale, due after one year but within five years, fair value	7,308
Securities available for sale, due after five years but within ten years, fair value	91,886
Securities available for sale, due after ten years, fair value	4,454
Securities available for sale, single maturity date, fair value	103,648
Securities available for sale
Nontaxable Municipal Bonds [Member] | Collateralized Mortgage Backed Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
Nontaxable Municipal Bonds [Member] | Equity Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
Corporate Debt Securities [Member]
Amortized cost maturity:
Securities available for sale, due within one year, amortized cost
Securities available for sale, due after one year but within five years, amortized cost
Securities available for sale, due after five years but within ten years, amortized cost	9,367
Securities available for sale, due after ten years, amortized cost
Securities available for sale, single maturity date, amortized cost	9,367
Securities available for sale, amortized cost
Fair value maturity:
Securities available for sale, due within one year, fair value
Securities available for sale, due after one year but within five years, fair value
Securities available for sale, due after five years but within ten years, fair value	8,884
Securities available for sale, due after ten years, fair value
Securities available for sale, single maturity date, fair value	8,884
Securities available for sale
Held-to-maturity, Amortized cost maturity:
Securities held to maturity, due within one year, amortized cost
Securities held to maturity, due after one year but within five years, amortized cost	7,212
Securities held to maturity, due after five years but within ten years, amortized cost
Securities held to maturity, due after ten years, amortized cost
Securities held to maturity	7,212
Held-to-maturity, Fair value maturity:
Securities held to maturity, due within one year, fair value
Securities held to maturity, due after one year but within five years, fair value	7,196
Securities held to maturity, due after five years but within ten years, fair value
Securities held to maturity, due after ten years, fair value
Securities held to maturity, fair value	7,196
Corporate Debt Securities [Member] | Collateralized Mortgage Backed Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value
Corporate Debt Securities [Member] | Equity Securities [Member]
Amortized cost maturity:
Securities available for sale, no single maturity date, amortized cost
Fair value maturity:
Securities available for sale, no single maturity date, fair value

X

- Definition

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

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of investment in available-for-sale debt securities with a single maturity date.

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