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Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | $ 281,021 | $ 374,858
Unrealized Losses | 3,925 | 7,259
Less Than 12 Months - Fair Value | 204,675 | 97,274
Less Than 12 Months - Unrealized Losses | 2,958 | 846
12 Months or More - Fair Value | 76,346 | 277,584
12 Months or More - Unrealized Losses | 967 | 6,413
Corporate Debt Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 77,680 | 39,287
Unrealized Losses | 2,320 | 714
Less Than 12 Months - Fair Value | 77,680 | 9,573
Less Than 12 Months - Unrealized Losses | 2,320 | 428
12 Months or More - Fair Value | 0 | 29,714
12 Months or More - Unrealized Losses | 0 | 286
Municipals Debt Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 5,233 | 8,810
Unrealized Losses | 40 | 61
Less Than 12 Months - Fair Value | 5,233 | 3,546
Less Than 12 Months - Unrealized Losses | 40 | 11
12 Months or More - Fair Value | 0 | 5,264
12 Months or More - Unrealized Losses | 0 | 50
Other Debt Obligations [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 43,710 | 292
Unrealized Losses | 89 | 8
Less Than 12 Months - Fair Value | 43,413 | 0
Less Than 12 Months - Unrealized Losses | 86 | 0
12 Months or More - Fair Value | 297 | 292
12 Months or More - Unrealized Losses | 3 | 8
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 126,623 | 48,389
Unrealized Losses | 2,449 | 783
Less Than 12 Months - Fair Value | 126,326 | 13,119
Less Than 12 Months - Unrealized Losses | 2,446 | 439
12 Months or More - Fair Value | 297 | 35,270
12 Months or More - Unrealized Losses | 3 | 344
REMIC And CMO [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 93,464 | 216,190
Unrealized Losses | 869 | 4,627
Less Than 12 Months - Fair Value | 44,618 | 77,382
Less Than 12 Months - Unrealized Losses | 266 | 399
12 Months or More - Fair Value | 48,846 | 138,808
12 Months or More - Unrealized Losses | 603 | 4,228
GNMA [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 7,364 | 8,358
Unrealized Losses | 88 | 124
Less Than 12 Months - Fair Value | 7,364 | 0
Less Than 12 Months - Unrealized Losses | 88 | 0
12 Months or More - Fair Value | 0 | 8,358
12 Months or More - Unrealized Losses | 0 | 124
FNMA [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 53,570 | 95,148
Unrealized Losses | 519 | 1,717
Less Than 12 Months - Fair Value | 26,367 | 0
Less Than 12 Months - Unrealized Losses | 158 | 0
12 Months or More - Fair Value | 27,203 | 95,148
12 Months or More - Unrealized Losses | 361 | 1,717
Collateralized Mortgage Backed Securities [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value | 154,398 | 326,469
Unrealized Losses | 1,476 | 6,476
Less Than 12 Months - Fair Value | 78,349 | 84,155
Less Than 12 Months - Unrealized Losses | 512 | 407
12 Months or More - Fair Value | 76,049 | 242,314
12 Months or More - Unrealized Losses | $ 964 | 6,069
FHLMC [Member] |  |
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items] |  |
Fair Value |  | 6,773
Unrealized Losses |  | 8
Less Than 12 Months - Fair Value |  | 6,773
Less Than 12 Months - Unrealized Losses |  | 8
12 Months or More - Fair Value |  | 0
12 Months or More - Unrealized Losses |  | $ 0

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