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Note 4 - Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 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 | 50,921 |
Securities held-to-maturity, fair value, due after ten years | 54,318 |
Securities held-to-maturity, amortized cost | 60,040 | $ 32,018
Securities held-to-maturity, fair value | 63,870 | 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 | 9,762 |
Securities available for sale, amortized cost, due after five years through ten years | 137,913 |
Securities available for sale, fair value, due after five years through ten years | 128,645 |
Securities available for sale, amortized cost, due after ten years | 96,590 |
Securities available for sale, fair value, due after ten years | 95,852 |
Securities available for sale, amortized cost, total other securities | 831,687 | 845,332
Securities available for sale | 825,475 | 822,655
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 52,101 | 24,065
Securities held-to-maturity, fair value | 55,498 | 22,508
Securities available for sale | 246,465 | 264,702
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,939 | 7,953
Securities held-to-maturity, fair value | 8,372 | 7,366
Securities available for sale, amortized cost, total other securities | 574,978 | 567,863
Securities available for sale | 579,010 | 557,953
Total Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 244,503 |
Securities available for sale | 234,259 |
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,206 | 11,586
Securities available for sale | $ 12,206 | $ 11,586

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