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Note 6 - Debt and Equity Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Trading Securities [Table Text Block] |
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Securites held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipals |  | $ | 6,180 |  |  | $ | 6,180 |  |  | $ | - |  |  | $ | - |
Total |  | $ | 6,180 |  |  | $ | 6,180 |  |  | $ | - |  |  | $ | - |
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Corporate |  | $ | 115,976 |  |  | $ | 111,674 |  |  | $ | 134 |  |  | $ | 4,436 |
Municipals |  |  | 127,696 |  |  |  | 131,583 |  |  |  | 3,887 |  |  |  | - |
Mutual funds |  |  | 21,290 |  |  |  | 21,290 |  |  |  | - |  |  |  | - |
Collateralized loan obligations |  |  | 53,225 |  |  |  | 52,898 |  |  |  | - |  |  |  | 327 |
Other |  |  | 7,214 |  |  |  | 7,212 |  |  |  | - |  |  |  | 2 |
Total other securities |  |  | 325,401 |  |  |  | 324,657 |  |  |  | 4,021 |  |  |  | 4,765 |
REMIC and CMO |  |  | 469,987 |  |  |  | 469,936 |  |  |  | 3,096 |  |  |  | 3,147 |
GNMA |  |  | 11,635 |  |  |  | 11,798 |  |  |  | 302 |  |  |  | 139 |
FNMA |  |  | 170,327 |  |  |  | 170,057 |  |  |  | 1,492 |  |  |  | 1,762 |
FHLMC |  |  | 16,961 |  |  |  | 16,949 |  |  |  | 87 |  |  |  | 99 |
Total mortgage-backed securities |  |  | 668,910 |  |  |  | 668,740 |  |  |  | 4,977 |  |  |  | 5,147 |
Total securities available for sale |  | $ | 994,311 |  |  | $ | 993,397 |  |  | $ | 8,998 |  |  | $ | 9,912 |
|  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
|  | (In thousands)
Corporate |  | $ | 90,719 |  |  | $ | 91,273 |  |  | $ | 1,268 |  |  | $ | 714 |
Municipals |  |  | 145,864 |  |  |  | 148,896 |  |  |  | 3,093 |  |  |  | 61 |
Mutual funds |  |  | 21,118 |  |  |  | 21,118 |  |  |  | - |  |  |  | - |
Other |  |  | 7,098 |  |  |  | 7,090 |  |  |  | - |  |  |  | 8 |
Total other securities |  |  | 264,799 |  |  |  | 268,377 |  |  |  | 4,361 |  |  |  | 783 |
REMIC and CMO |  |  | 504,207 |  |  |  | 505,768 |  |  |  | 6,188 |  |  |  | 4,627 |
GNMA |  |  | 13,862 |  |  |  | 14,159 |  |  |  | 421 |  |  |  | 124 |
FNMA |  |  | 169,956 |  |  |  | 170,367 |  |  |  | 2,128 |  |  |  | 1,717 |
FHLMC |  |  | 14,505 |  |  |  | 14,639 |  |  |  | 142 |  |  |  | 8 |
Total mortgage-backed securities |  |  | 702,530 |  |  |  | 704,933 |  |  |  | 8,879 |  |  |  | 6,476 |
Total securities available for sale |  | $ | 967,329 |  |  | $ | 973,310 |  |  | $ | 13,240 |  |  | $ | 7,259 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Amortized Cost |  | Fair Value
|  | (In thousands)
Due in one year or less |  | $ | 6,140 |  |  | $ | 6,140 |
Due after one year through five years |  |  | 40 |  |  |  | 40 |
Total securities held-to-maturity |  | $ | 6,180 |  |  | $ | 6,180 |
|  | Amortized Cost |  | Fair Value
|  | (In thousands)
Due in one year or less |  | $ | 5,976 |  |  | $ | 6,011 |
Due after one year through five years |  |  | - |  |  |  | - |
Due after five years through ten years |  |  | 76,791 |  |  |  | 75,406 |
Due after ten years |  |  | 221,344 |  |  |  | 221,950 |
Total other securities |  |  | 304,111 |  |  |  | 303,367 |
Mutual funds |  |  | 21,290 |  |  |  | 21,290 |
Mortgage-backed securities |  |  | 668,910 |  |  |  | 668,740 |
Total securities available for sale |  | $ | 994,311 |  |  | $ | 993,397 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Total |  | Less than 12 months |  | 12 months or more
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (In thousands)
Corporate |  | $ | 85,563 |  |  | $ | 4,436 |  |  | $ | 76,218 |  |  | $ | 3,782 |  |  | $ | 9,345 |  |  | $ | 654 |
Collateralized loan obligations |  |  | 52,898 |  |  |  | 327 |  |  |  | 52,898 |  |  |  | 327 |  |  |  | - |  |  |  | - |
Other |  |  | 298 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | 298 |  |  |  | 2 |
Total other securities |  |  | 138,759 |  |  |  | 4,765 |  |  |  | 129,116 |  |  |  | 4,109 |  |  |  | 9,643 |  |  |  | 656 |
REMIC and CMO |  |  | 238,132 |  |  |  | 3,147 |  |  |  | 182,010 |  |  |  | 1,642 |  |  |  | 56,122 |  |  |  | 1,505 |
GNMA |  |  | 6,977 |  |  |  | 139 |  |  |  | 6,977 |  |  |  | 139 |  |  |  | - |  |  |  | - |
FNMA |  |  | 102,225 |  |  |  | 1,762 |  |  |  | 75,769 |  |  |  | 1,043 |  |  |  | 26,456 |  |  |  | 719 |
FHLMC |  |  | 14,715 |  |  |  | 99 |  |  |  | 14,715 |  |  |  | 99 |  |  |  | - |  |  |  | - |
Total mortgage-backed securities |  |  | 362,049 |  |  |  | 5,147 |  |  |  | 279,471 |  |  |  | 2,923 |  |  |  | 82,578 |  |  |  | 2,224 |
Total securities available for sale |  | $ | 500,808 |  |  | $ | 9,912 |  |  | $ | 408,587 |  |  | $ | 7,032 |  |  | $ | 92,221 |  |  | $ | 2,880 |
|  | Total |  | Less than 12 months |  | 12 months or more
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (In thousands)
Corporate |  | $ | 39,287 |  |  | $ | 714 |  |  | $ | 9,573 |  |  | $ | 428 |  |  | $ | 29,714 |  |  | $ | 286 |
Municipals |  |  | 8,810 |  |  |  | 61 |  |  |  | 3,546 |  |  |  | 11 |  |  |  | 5,264 |  |  |  | 50 |
Other |  |  | 292 |  |  |  | 8 |  |  |  | - |  |  |  | - |  |  |  | 292 |  |  |  | 8 |
Total other securities |  |  | 48,389 |  |  |  | 783 |  |  |  | 13,119 |  |  |  | 439 |  |  |  | 35,270 |  |  |  | 344 |
REMIC and CMO |  |  | 216,190 |  |  |  | 4,627 |  |  |  | 77,382 |  |  |  | 399 |  |  |  | 138,808 |  |  |  | 4,228 |
GNMA |  |  | 8,358 |  |  |  | 124 |  |  |  | - |  |  |  | - |  |  |  | 8,358 |  |  |  | 124 |
FNMA |  |  | 95,148 |  |  |  | 1,717 |  |  |  | - |  |  |  | - |  |  |  | 95,148 |  |  |  | 1,717 |
FHLMC |  |  | 6,773 |  |  |  | 8 |  |  |  | 6,773 |  |  |  | 8 |  |  |  | - |  |  |  | - |
Total mortgage-backed securities |  |  | 326,469 |  |  |  | 6,476 |  |  |  | 84,155 |  |  |  | 407 |  |  |  | 242,314 |  |  |  | 6,069 |
Total securities available for sale |  | $ | 374,858 |  |  | $ | 7,259 |  |  | $ | 97,274 |  |  | $ | 846 |  |  | $ | 277,584 |  |  | $ | 6,413 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] |
|  | For the years ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (In thousands)
Beginning balance |  | $ | - |  |  | $ | 3,738 |  |  | $ | 6,178 |
Recognition of actual losses |  |  | - |  |  |  | - |  |  |  | (842 | )
OTTI charges due to credit loss recorded in earnings |  |  | - |  |  |  | - |  |  |  | 1,419 |
Securities sold during the period |  |  | - |  |  |  | (3,738 | ) |  |  | (3,017 | )
Ending balance |  | $ | - |  |  | $ | - |  |  | $ | 3,738 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | For the years ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (In thousands)
Gross gains from the sale of securities |  | $ | 2,899 |  |  | $ | 5,247 |  |  | $ | 5,222 |
Gross losses from the sale of securities |  |  | (2,732 | ) |  |  | (2,372 | ) |  |  | (2,201 | )
Net gains from the sale of securities |  | $ | 167 |  |  | $ | 2,875 |  |  | $ | 3,021 |

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