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Note 2 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Securities available for sale, amortized cost, due in one year or less	$ 21,718
Securities available for sale, fair value, due in one year or less	21,608
Securities available for sale, amortized cost, due after one year through five years	58,618
Securities available for sale, fair value, due after one year through five years	57,178
Securities available for sale, amortized cost, due after five years through ten years	31,003
Securities available for sale, fair value, due after five years through ten years	30,385
Securities available for sale, amortized cost, due after ten years	18,090
Securities available for sale, fair value, due after ten years	17,938
Securities available for sale, amortized cost, single maturity	129,429
Securities available for sale, fair value, single maturity	127,109
Securities available for sale, amortized cost, Mortgage-backed securities and CMO	132,067
Securities available for sale, fair value, Mortgage-backed securities and CMO	126,104
Securities available for sale, amortized cost	261,496	$ 273,878
Securities available for sale, fair value	253,213	$ 271,172
Debt Securities [Member]
Securities available for sale, amortized cost	261,496
Securities available for sale, fair value	$ 253,213

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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