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Note 4 - Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities held-to-maturity, amortized cost, due in one year or less	$ 1,180
Securities held-to-maturity, fair value, due in one year or less	1,180
Securities held-to-maturity, amortized cost, due after ten years	21,352
Securities held-to-maturity, fair value, due after ten years	21,096
Securities held-to-maturity, amortized cost	30,481	$ 32,018
Securities held-to-maturity, fair value	30,002	29,874
Securities available for sale, amortized cost, due after one year through five years	10,000
Securities available for sale, fair value, due after one year through five years	9,587
Securities available for sale, amortized cost, due after five years through ten years	131,963
Securities available for sale, fair value, due after five years through ten years	123,717
Securities available for sale, amortized cost, due after ten years	122,409
Securities available for sale, fair value, due after ten years	121,733
Securities available for sale, amortized cost	860,558	845,332
Securities available for sale	846,024	822,655
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	22,532	24,065
Securities held-to-maturity, fair value	22,276	22,508
Securities available for sale	266,839	264,702
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,949	7,953
Securities held-to-maturity, fair value	7,726	7,366
Securities available for sale, amortized cost	584,384	567,863
Securities available for sale	579,185	557,953
Total Other Securities [Member]
Securities available for sale, amortized cost	264,372
Securities available for sale	255,037
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost	11,802	11,586
Securities available for sale	$ 11,802	$ 11,586

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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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