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Note 4 - Debt and Equity Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held-to-maturity, amortized cost | $ 36,406 | $ 37,735
Other securities, fair value option | 34,152 | 35,408
Securities held-to-maturity, gross unrealized gains | 0 | 0
Securities held-to-maturity, gross unrealized losses | 2,254 | 2,327
Securities available for sale, amortized cost | 888,812 | 868,009
Fair Value | 884,143 | 861,381
Gross Unrealized Gains | 6,308 | 5,091
Gross Unrealized Losses | 10,977 | 11,719
Corporate Debt Securities [Member] |  |
Securities available for sale, amortized cost | 110,000 | 110,000
Fair Value | 103,694 | 102,910
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 6,306 | 7,090
Municipal Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 36,406 | 37,735
Other securities, fair value option | 34,152 | 35,408
Securities held-to-maturity, gross unrealized gains | 0 | 0
Securities held-to-maturity, gross unrealized losses | 2,254 | 2,327
Securities available for sale, amortized cost | 124,296 | 124,984
Fair Value | 127,281 | 126,903
Gross Unrealized Gains | 2,985 | 1,983
Gross Unrealized Losses | 0 | 64
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost | 21,431 | 21,366
Fair Value | 21,431 | 21,366
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Collateralized Debt Obligations [Member] |  |
Securities available for sale, amortized cost | 85,470 | 85,470
Fair Value | 86,438 | 86,365
Gross Unrealized Gains | 968 | 895
Gross Unrealized Losses | 0 |
Other Debt Obligations [Member] |  |
Securities available for sale, amortized cost | 7,396 | 7,363
Fair Value | 7,394 | 7,361
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2 | 2
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost | 348,593 | 349,183
Fair Value | 346,238 | 344,905
Gross Unrealized Gains | 3,953 | 2,878
Gross Unrealized Losses | 6,308 | 7,156
REMIC and CMO [Member] |  |
Securities available for sale, amortized cost | 426,537 | 402,636
Fair Value | 425,209 | 401,370
Gross Unrealized Gains | 1,826 | 1,607
Gross Unrealized Losses | 3,154 | 2,873
GNMA [Member] |  |
Securities available for sale, amortized cost | 1,250 | 1,319
Fair Value | 1,352 | 1,427
Gross Unrealized Gains | 102 | 108
Gross Unrealized Losses | 0 |
FNMA [Member] |  |
Securities available for sale, amortized cost | 107,176 | 109,493
Fair Value | 106,140 | 108,351
Gross Unrealized Gains | 396 | 463
Gross Unrealized Losses | 1,432 | 1,605
FHLMC [Member] |  |
Securities available for sale, amortized cost | 5,256 | 5,378
Fair Value | 5,204 | 5,328
Gross Unrealized Gains | 31 | 35
Gross Unrealized Losses | 83 | 85
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost | 540,219 | 518,826
Fair Value | 537,905 | 516,476
Gross Unrealized Gains | 2,355 | 2,213
Gross Unrealized Losses | $ 4,669 | $ 4,563

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