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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | As of December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 284,678 |  |  | $ | 5 |  |  | $ | 395 |  |  |  | 284,288 |
U.S. government sponsored entities |  |  | 150,000 |  |  |  | - |  |  |  | 1,840 |  |  |  | 148,160 |
Mortgage-backed securities |  |  | 1,073,108 |  |  |  | 560 |  |  |  | 11,399 |  |  |  | 1,062,269 |
Collateralized mortgage obligations |  |  | 63 |  |  |  | - |  |  |  | 27 |  |  |  | 36 |
Corporate debt securities |  |  | 74,955 |  |  |  | 425 |  |  |  | 1,525 |  |  |  | 73,855 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 167 |  |  |  | 5,833 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 633 |  |  |  | 228 |  |  |  | 3,216 |
Other equity securities |  |  | 4,108 |  |  |  | 4,929 |  |  |  | 342 |  |  |  | 8,695 |
Total securities available-for-sale |  | $ | 1,595,723 |  |  | $ | 6,552 |  |  | $ | 15,923 |  |  | $ | 1,586,352 |
|  | As of December 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 664,206 |  |  | $ | 63 |  |  | $ | 265 |  |  |  | 664,004 |
Mortgage-backed securities |  |  | 549,296 |  |  |  | 1,393 |  |  |  | 6,386 |  |  |  | 544,303 |
Collateralized mortgage obligations |  |  | 79 |  |  |  | - |  |  |  | 34 |  |  |  | 45 |
Corporate debt securities |  |  | 94,943 |  |  |  | 776 |  |  |  | 1,247 |  |  |  | 94,472 |
Mutual funds |  |  | 6,000 |  |  |  |  |  |  |  | 134 |  |  |  | 5,866 |
Preferred stock of government sponsored entities |  |  | 6,276 |  |  |  | 681 |  |  |  | 3,733 |  |  |  | 3,224 |
Other equity securities |  |  | 3,608 |  |  |  | 3,413 |  |  |  |  |  |  |  | 7,021 |
Total securities available-for-sale |  | $ | 1,324,408 |  |  | $ | 6,326 |  |  | $ | 11,799 |  |  | $ | 1,318,935 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available-for-Sale |
|  | Amortized Cost |  |  | Fair Value |
|  | (In thousands) |
Due in one year or less |  | $ | 184,963 |  |  | $ | 184,956 |
Due after one year through five years |  |  | 135,698 |  |  |  | 135,924 |
Due after five years through ten years |  |  | 195,539 |  |  |  | 192,291 |
Due after ten years (1) |  |  | 1,079,523 |  |  |  | 1,073,181 |
Total |  | $ | 1,595,723 |  |  | $ | 1,586,352 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | As of December 15, 2015 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 224,289 |  |  | $ | 395 |  |  |  | 5 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 224,289 |  |  | $ | 395 |  |  |  | 5 |
U.S. government sponsored entities |  |  | 148,160 |  |  |  | 1,840 |  |  |  | 3 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 148,160 |  |  |  | 1,840 |  |  |  | 3 |
Mortgage-backed securities |  |  | 1,025,342 |  |  |  | 11,398 |  |  |  | 35 |  |  |  | 6 |  |  |  | 1 |  |  |  | 2 |  |  |  | 1,025,348 |  |  |  | 11,399 |  |  |  | 37 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 36 |  |  |  | 27 |  |  |  | 1 |  |  |  | 36 |  |  |  | 27 |  |  |  | 1 |
Corporate debt securities |  |  | 9,950 |  |  |  | 50 |  |  |  | 1 |  |  |  | 43,525 |  |  |  | 1,475 |  |  |  | 3 |  |  |  | 53,475 |  |  |  | 1,525 |  |  |  | 4 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,833 |  |  |  | 167 |  |  |  | 1 |  |  |  | 5,833 |  |  |  | 167 |  |  |  | 1 |
Preferred stock of government sponsored entities |  |  | 2,488 |  |  |  | 228 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2,488 |  |  |  | 228 |  |  |  | 2 |
Other equity securities |  |  | 158 |  |  |  | 342 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 158 |  |  |  | 342 |  |  |  | 1 |
Total securities available-for-sale |  | $ | 1,410,387 |  |  | $ | 14,253 |  |  |  | 47 |  |  | $ | 49,400 |  |  | $ | 1,670 |  |  |  | 7 |  |  | $ | 1,459,787 |  |  | $ | 15,923 |  |  |  | 54 |
|  | As of December 31, 2014 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |  |  | Fair Value |  |  | Unrealized Losses |  |  | No. of Issuances |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 374,153 |  |  | $ | 265 |  |  |  | 6 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 374,153 |  |  | $ | 265 |  |  |  | 6 |
Mortgage-backed securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 425,090 |  |  |  | 6,386 |  |  |  | 16 |  |  |  | 425,090 |  |  |  | 6,386 |  |  |  | 16 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 45 |  |  |  | 34 |  |  |  | 1 |  |  |  | 45 |  |  |  | 34 |  |  |  | 1 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 63,753 |  |  |  | 1,247 |  |  |  | 4 |  |  |  | 63,753 |  |  |  | 1,247 |  |  |  | 4 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,866 |  |  |  | 134 |  |  |  | 1 |  |  |  | 5,866 |  |  |  | 134 |  |  |  | 1 |
Preferred stock of government sponsored entities |  |  | 2,448 |  |  |  | 3,733 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2,448 |  |  |  | 3,733 |  |  |  | 2 |
Total securities available-for-sale |  | $ | 376,601 |  |  | $ | 3,998 |  |  |  | 8 |  |  | $ | 494,754 |  |  | $ | 7,801 |  |  |  | 22 |  |  | $ | 871,355 |  |  | $ | 11,799 |  |  |  | 30 |

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