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Note 6 - Debt and Equity Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held-to-maturity | $ 30,886 | $ 37,735
Securities held-to-maturity, fair value | 29,699 | 35,408
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 1,187 | 2,327
Securities available for sale, amortized cost | 748,350 | 868,009
Securities available for sale | 738,354 | 861,381
Securities available for sale, gross unrealized gains | 2,587 | 5,091
Securities available for sale, gross unrealized losses | 12,583 | 11,719
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost | 110,000 | 110,000
Securities available for sale | 102,767 | 102,910
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses | 7,233 | 7,090
Municipal Debt Securities [Member] |  |
Securities held-to-maturity | 22,913 | 37,735
Securities held-to-maturity, fair value | 21,889 | 35,408
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 1,024 | 2,327
Securities available for sale, amortized cost | 101,680 | 124,984
Securities available for sale | 103,199 | 126,903
Securities available for sale, gross unrealized gains | 1,519 | 1,983
Securities available for sale, gross unrealized losses |  | 64
Other Debt Obligations [Member] |  |
Securities held-to-maturity | 22,913 | 37,735
Securities held-to-maturity, fair value | 21,889 | 35,408
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 1,024 |
Securities available for sale | 228,704 | 344,905
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost | 11,575 | 21,366
Securities available for sale | 11,575 | 21,366
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses |  |
FNMA [Member] |  |
Securities held-to-maturity | 7,973 |
Securities held-to-maturity, fair value | 7,810 |
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 163 |
Securities available for sale, amortized cost | 136,198 | 109,493
Securities available for sale | 135,474 | 108,351
Securities available for sale, gross unrealized gains | 330 | 463
Securities available for sale, gross unrealized losses | 1,054 | 1,605
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost | 10,000 | 85,470
Securities available for sale | 10,053 | 86,365
Securities available for sale, gross unrealized gains | 53 | 895
Securities available for sale, gross unrealized losses |  |
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity | 7,973 |
Securities held-to-maturity, fair value | 7,810 |
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 163 |
Securities available for sale, amortized cost | 513,985 | 518,826
Securities available for sale | 509,650 | 516,476
Securities available for sale, gross unrealized gains | 1,015 | 2,213
Securities available for sale, gross unrealized losses | 5,350 | 4,563
Other Securities [Member] |  |
Securities available for sale, amortized cost | 1,110 | 7,363
Securities available for sale | 1,110 | 7,361
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses |  | 2
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost | 234,365 | 349,183
Securities available for sale | 228,704 | 344,905
Securities available for sale, gross unrealized gains | 1,572 | 2,878
Securities available for sale, gross unrealized losses | 7,233 | 7,156
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost | 328,668 | 402,636
Securities available for sale | 325,302 | 401,370
Securities available for sale, gross unrealized gains | 595 | 1,607
Securities available for sale, gross unrealized losses | 3,961 | 2,873
GNMA [Member] |  |
Securities available for sale, amortized cost | 1,016 | 1,319
Securities available for sale | 1,088 | 1,427
Securities available for sale, gross unrealized gains | 72 | 108
Securities available for sale, gross unrealized losses |  |
FHLMC [Member] |  |
Securities available for sale, amortized cost | 48,103 | 5,378
Securities available for sale | 47,786 | 5,328
Securities available for sale, gross unrealized gains | 18 | 35
Securities available for sale, gross unrealized losses | $ 335 | $ 85

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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