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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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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 + Details
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