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Note 4 - Debt and Equity Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 31,235,000 | $ 30,886,000
Securities held-to-maturity, fair value | 28,911,000 | 29,699,000
Securities held-to-maturity, gross unrealized gains |  | 0
Securities held-to-maturity, gross unrealized losses | 2,324,000 | 1,187,000
Securities available for sale, amortized cost, total other securities | 748,952,000 | 748,350,000
Securities available for sale, fair value | 729,261,000 | 738,354,000
Securities available for sale, gross unrealized gains | 1,526,000 | 2,587,000
Securities available for sale, gross unrealized losses | 21,217,000 | 12,583,000
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 110,000,000 | 110,000,000
Securities available for sale, fair value | 101,578,000 | 102,767,000
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses | 8,422,000 | 7,233,000
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 23,267,000 | 22,913,000
Securities held-to-maturity, fair value | 21,347,000 | 21,889,000
Securities held-to-maturity, gross unrealized gains |  | 0
Securities held-to-maturity, gross unrealized losses | 1,920,000 | 1,024,000
Securities available for sale, amortized cost, total other securities | 101,129,000 | 101,680,000
Securities available for sale, fair value | 102,289,000 | 103,199,000
Securities available for sale, gross unrealized gains | 1,191,000 | 1,519,000
Securities available for sale, gross unrealized losses | 31,000 |
Other Debt Obligations [Member] |  |
Securities held-to-maturity, amortized cost | 23,267,000 | 22,913,000
Securities held-to-maturity, fair value | 21,347,000 | 21,889,000
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 1,920,000 | 1,024,000
Securities available for sale, fair value | 216,480,000 | 228,704,000
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 11,451,000 | 11,575,000
Securities available for sale, fair value | 11,451,000 | 11,575,000
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses |  |
FNMA [Member] |  |
Securities held-to-maturity, amortized cost | 7,968,000 | 7,973,000
Securities held-to-maturity, fair value | 7,564,000 | 7,810,000
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 404,000 | 163,000
Securities available for sale, amortized cost, total other securities | 131,918,000 | 136,198,000
Securities available for sale, fair value | 128,535,000 | 135,474,000
Securities available for sale, gross unrealized gains | 68,000 | 330,000
Securities available for sale, gross unrealized losses | 3,451,000 | 1,054,000
Other Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 1,162,000 | 1,110,000
Securities available for sale, fair value | 1,162,000 | 1,110,000
Securities available for sale, gross unrealized gains |  |
Securities available for sale, gross unrealized losses |  |
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost, total other securities |  | 10,000,000
Securities available for sale, fair value |  | 10,053,000
Securities available for sale, gross unrealized gains |  | 53,000
Securities available for sale, gross unrealized losses |  |
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,968,000 | 7,973,000
Securities held-to-maturity, fair value | 7,564,000 | 7,810,000
Securities held-to-maturity, gross unrealized gains |  |
Securities held-to-maturity, gross unrealized losses | 404,000 | 163,000
Securities available for sale, amortized cost, total other securities | 525,210,000 | 513,985,000
Securities available for sale, fair value | 512,781,000 | 509,650,000
Securities available for sale, gross unrealized gains | 335,000 | 1,015,000
Securities available for sale, gross unrealized losses | 12,764,000 | 5,350,000
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 223,742,000 | 234,365,000
Securities available for sale, fair value | 216,480,000 | 228,704,000
Securities available for sale, gross unrealized gains | 1,191,000 | 1,572,000
Securities available for sale, gross unrealized losses | 8,453,000 | 7,233,000
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost, total other securities | 346,414,000 | 328,668,000
Securities available for sale, fair value | 338,368,000 | 325,302,000
Securities available for sale, gross unrealized gains | 188,000 | 595,000
Securities available for sale, gross unrealized losses | 8,234,000 | 3,961,000
GNMA [Member] |  |
Securities available for sale, amortized cost, total other securities | 940,000 | 1,016,000
Securities available for sale, fair value | 1,004,000 | 1,088,000
Securities available for sale, gross unrealized gains | 64,000 | 72,000
Securities available for sale, gross unrealized losses |  |
FHLMC [Member] |  |
Securities available for sale, amortized cost, total other securities | 45,938,000 | 48,103,000
Securities available for sale, fair value | 44,874,000 | 47,786,000
Securities available for sale, gross unrealized gains | 15,000 | 18,000
Securities available for sale, gross unrealized losses | $ 1,079,000 | $ 335,000

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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