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Note 4 - Debt and Equity Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Trading Securities [Table Text Block] |
|  | At March 31, 2017
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Securites held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipals |  | $ | 36,406 |  |  | $ | 34,152 |  |  | $ | - |  |  | $ | 2,254 |
Total |  | $ | 36,406 |  |  | $ | 34,152 |  |  | $ | - |  |  | $ | 2,254 |
|  | At December 31, 2016
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Securites held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipals |  | $ | 37,735 |  |  | $ | 35,408 |  |  | $ | - |  |  | $ | 2,327 |
Total |  | $ | 37,735 |  |  | $ | 35,408 |  |  | $ | - |  |  | $ | 2,327 |
|  | At March 31, 2017
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Corporate |  | $ | 110,000 |  |  | $ | 103,694 |  |  | $ | - |  |  | $ | 6,306 |
Municipals |  |  | 124,296 |  |  |  | 127,281 |  |  |  | 2,985 |  |  |  | - |
Mutual funds |  |  | 21,431 |  |  |  | 21,431 |  |  |  | - |  |  |  | - |
Collateralized loan obligations |  |  | 85,470 |  |  |  | 86,438 |  |  |  | 968 |  |  |  | - |
Other |  |  | 7,396 |  |  |  | 7,394 |  |  |  | - |  |  |  | 2 |
Total other securities |  |  | 348,593 |  |  |  | 346,238 |  |  |  | 3,953 |  |  |  | 6,308 |
REMIC and CMO |  |  | 426,537 |  |  |  | 425,209 |  |  |  | 1,826 |  |  |  | 3,154 |
GNMA |  |  | 1,250 |  |  |  | 1,352 |  |  |  | 102 |  |  |  | - |
FNMA |  |  | 107,176 |  |  |  | 106,140 |  |  |  | 396 |  |  |  | 1,432 |
FHLMC |  |  | 5,256 |  |  |  | 5,204 |  |  |  | 31 |  |  |  | 83 |
Total mortgage-backed securities |  |  | 540,219 |  |  |  | 537,905 |  |  |  | 2,355 |  |  |  | 4,669 |
Total securities available for sale |  | $ | 888,812 |  |  | $ | 884,143 |  |  | $ | 6,308 |  |  | $ | 10,977 |
|  | At December 31, 2016
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Corporate |  | $ | 110,000 |  |  | $ | 102,910 |  |  | $ | - |  |  | $ | 7,090 |
Municipals |  |  | 124,984 |  |  |  | 126,903 |  |  |  | 1,983 |  |  |  | 64 |
Mutual funds |  |  | 21,366 |  |  |  | 21,366 |  |  |  | - |  |  |  | - |
Collateralized loan obligations |  |  | 85,470 |  |  |  | 86,365 |  |  |  | 895 |  |  |  | - |
Other |  |  | 7,363 |  |  |  | 7,361 |  |  |  | - |  |  |  | 2 |
Total other securities |  |  | 349,183 |  |  |  | 344,905 |  |  |  | 2,878 |  |  |  | 7,156 |
REMIC and CMO |  |  | 402,636 |  |  |  | 401,370 |  |  |  | 1,607 |  |  |  | 2,873 |
GNMA |  |  | 1,319 |  |  |  | 1,427 |  |  |  | 108 |  |  |  | - |
FNMA |  |  | 109,493 |  |  |  | 108,351 |  |  |  | 463 |  |  |  | 1,605 |
FHLMC |  |  | 5,378 |  |  |  | 5,328 |  |  |  | 35 |  |  |  | 85 |
Total mortgage-backed securities |  |  | 518,826 |  |  |  | 516,476 |  |  |  | 2,213 |  |  |  | 4,563 |
Total securities available for sale |  | $ | 868,009 |  |  | $ | 861,381 |  |  | $ | 5,091 |  |  | $ | 11,719 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
Held-to-maturity |  | Amortized Cost |  | Fair Value
|  | (In thousands)
Due in one year or less |  | $ | 14,540 |  |  | $ | 14,540 |
Due after ten years |  |  | 21,866 |  |  |  | 19,612 |
Total securities held-to-maturity |  | $ | 36,406 |  |  | $ | 34,152 |
Available for sale |  | Amortized Cost |  | Fair Value
|  | (In thousands)
Due in one year or less |  | $ | - |  |  | $ | - |
Due after one year through five years |  |  | 1,766 |  |  |  | 1,774 |
Due after five years through ten years |  |  | 121,217 |  |  |  | 119,423 |
Due after ten years |  |  | 204,179 |  |  |  | 203,610 |
Total other securities |  |  | 327,162 |  |  |  | 324,807 |
Mutual funds |  |  | 21,431 |  |  |  | 21,431 |
Mortgage-backed securities |  |  | 540,219 |  |  |  | 537,905 |
Total securities available for sale |  | $ | 888,812 |  |  | $ | 884,143 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | At March 31, 2017
|  |  |  | Total |  | Less than 12 months |  | 12 months or more
|  | Count |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  |  |  | (Dollars in thousands)
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipals |  |  | 1 |  |  | $ | 19,612 |  |  | $ | 2,254 |  |  | $ | 19,612 |  |  | $ | 2,254 |  |  | $ | - |  |  | $ | - |
Total securities held-to-maturity |  |  | 1 |  |  | $ | 19,612 |  |  | $ | 2,254 |  |  | $ | 19,612 |  |  | $ | 2,254 |  |  | $ | - |  |  | $ | - |
Available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  |  | 14 |  |  | $ | 103,694 |  |  | $ | 6,306 |  |  | $ | 19,209 |  |  | $ | 791 |  |  | $ | 84,485 |  |  | $ | 5,515 |
Other |  |  | 1 |  |  |  | 299 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | 299 |  |  |  | 2 |
Total other securities |  |  | 15 |  |  |  | 103,993 |  |  |  | 6,308 |  |  |  | 19,209 |  |  |  | 791 |  |  |  | 84,784 |  |  |  | 5,517 |
REMIC and CMO |  |  | 34 |  |  |  | 208,825 |  |  |  | 3,154 |  |  |  | 195,016 |  |  |  | 2,516 |  |  |  | 13,809 |  |  |  | 638 |
FNMA |  |  | 17 |  |  |  | 75,059 |  |  |  | 1,432 |  |  |  | 69,340 |  |  |  | 1,089 |  |  |  | 5,719 |  |  |  | 343 |
FHLMC |  |  | 1 |  |  |  | 3,972 |  |  |  | 83 |  |  |  | 3,972 |  |  |  | 83 |  |  |  | - |  |  |  | - |
Total mortgage-backed securities |  |  | 52 |  |  |  | 287,856 |  |  |  | 4,669 |  |  |  | 268,328 |  |  |  | 3,688 |  |  |  | 19,528 |  |  |  | 981 |
Total securities available for sale |  |  | 67 |  |  | $ | 391,849 |  |  | $ | 10,977 |  |  | $ | 287,537 |  |  | $ | 4,479 |  |  | $ | 104,312 |  |  | $ | 6,498 |
|  | At December 31, 2016
|  |  |  | Total |  | Less than 12 months |  | 12 months or more
|  | Count |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (Dollars in thousands)
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipals |  |  | 1 |  |  | $ | 19,538 |  |  | $ | 2,327 |  |  | $ | 19,538 |  |  | $ | 2,327 |  |  | $ | - |  |  | $ | - |
Total securities held-to-maturity |  |  | 1 |  |  | $ | 19,538 |  |  | $ | 2,327 |  |  | $ | 19,538 |  |  | $ | 2,327 |  |  | $ | - |  |  | $ | - |
Available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  |  | 14 |  |  | $ | 102,910 |  |  | $ | 7,090 |  |  | $ | 28,476 |  |  | $ | 1,524 |  |  | $ | 74,434 |  |  | $ | 5,566 |
Municipals |  |  | 4 |  |  |  | 16,047 |  |  |  | 64 |  |  |  | 16,047 |  |  |  | 64 |  |  |  | - |  |  |  | - |
Other |  |  | 1 |  |  |  | 298 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | 298 |  |  |  | 2 |
Total other securities |  |  | 19 |  |  |  | 119,255 |  |  |  | 7,156 |  |  |  | 44,523 |  |  |  | 1,588 |  |  |  | 74,732 |  |  |  | 5,568 |
REMIC and CMO |  |  | 35 |  |  |  | 222,807 |  |  |  | 2,873 |  |  |  | 208,827 |  |  |  | 2,268 |  |  |  | 13,980 |  |  |  | 605 |
FNMA |  |  | 18 |  |  |  | 80,924 |  |  |  | 1,605 |  |  |  | 74,972 |  |  |  | 1,250 |  |  |  | 5,952 |  |  |  | 355 |
FHLMC |  |  | 1 |  |  |  | 3,993 |  |  |  | 85 |  |  |  | 3,993 |  |  |  | 85 |  |  |  | - |  |  |  | - |
Total mortgage-backed securities |  |  | 54 |  |  |  | 307,724 |  |  |  | 4,563 |  |  |  | 287,792 |  |  |  | 3,603 |  |  |  | 19,932 |  |  |  | 960 |
Total securities available for sale |  |  | 73 |  |  | $ | 426,979 |  |  | $ | 11,719 |  |  | $ | 332,315 |  |  | $ | 5,191 |  |  | $ | 94,664 |  |  | $ | 6,528 |

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