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Note 6 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 32,018 | $ 30,886
Securities held-to-maturity, fair value | 29,874 | 29,699
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 2,144 | 1,187
Securities available for sale, amortized cost, total other securities | 845,332 | 748,350
Securities available for sale, fair value | 822,655 | 738,354
Securities available for sale, gross unrealized gains | 1,454 | 2,587
Securities available for sale, gross unrealized losses | 24,131 | 12,583
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 130,000 | 110,000
Securities available for sale, fair value | 118,535 | 102,767
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses | 11,465 | 7,233
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 24,065 | 22,913
Securities held-to-maturity, fair value | 22,508 | 21,889
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 1,557 | 1,024
Securities available for sale, amortized cost, total other securities | 46,231 | 101,680
Securities available for sale, fair value | 46,574 | 103,199
Securities available for sale, gross unrealized gains | 343 | 1,519
Securities available for sale, gross unrealized losses |  |
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 24,065 | 22,913
Securities held-to-maturity, fair value | 22,508 | 21,889
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 1,557 | 1,024
Securities available for sale, fair value | 264,702 | 228,704
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 11,586 | 11,575
Securities available for sale, fair value | 11,586 | 11,575
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses |  |
FNMA [Member] |  |
Securities held-to-maturity, amortized cost | 7,953 | 7,973
Securities held-to-maturity, fair value | 7,366 | 7,810
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 587 | 163
Securities available for sale, amortized cost, total other securities | 94,069 | 136,198
Securities available for sale, fair value | 91,693 | 135,474
Securities available for sale, gross unrealized gains | 72 | 330
Securities available for sale, gross unrealized losses | 2,448 | 1,054
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost, total other securities | 88,396 | 10,000
Securities available for sale, fair value | 86,751 | 10,053
Securities available for sale, gross unrealized gains |  | 53
Securities available for sale, gross unrealized losses | 1,645 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,953 | 7,973
Securities held-to-maturity, fair value | 7,366 | 7,810
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 587 | 163
Securities available for sale, amortized cost, total other securities | 567,863 | 513,985
Securities available for sale, fair value | 557,953 | 509,650
Securities available for sale, gross unrealized gains | 1,111 | 1,015
Securities available for sale, gross unrealized losses | 11,021 | 5,350
Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 1,256 | 1,110
Securities available for sale, fair value | 1,256 | 1,110
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 277,469 | 234,365
Securities available for sale, fair value | 264,702 | 228,704
Securities available for sale, gross unrealized gains | 343 | 1,572
Securities available for sale, gross unrealized losses | 13,110 | 7,233
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost, total other securities | 382,632 | 328,668
Securities available for sale, fair value | 376,340 | 325,302
Securities available for sale, gross unrealized gains | 885 | 595
Securities available for sale, gross unrealized losses | 7,177 | 3,961
GNMA [Member] |  |
Securities available for sale, amortized cost, total other securities | 785 | 1,016
Securities available for sale, fair value | 826 | 1,088
Securities available for sale, gross unrealized gains | 41 | 72
Securities available for sale, gross unrealized losses |  |
FHLMC [Member] |  |
Securities available for sale, amortized cost, total other securities | 90,377 | 48,103
Securities available for sale, fair value | 89,094 | 47,786
Securities available for sale, gross unrealized gains | 113 | 18
Securities available for sale, gross unrealized losses | $ 1,396 | $ 335

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