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Note 6 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2016 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 389,921 |  |  | $ | 112 |  |  | $ | 24 |  |  | $ | 390,009 |
U.S. government sponsored entities |  |  | 250,000 |  |  |  | 79 |  |  |  | 69 |  |  |  | 250,010 |
Mortgage-backed securities |  |  | 556,454 |  |  |  | 7,186 |  |  |  | 2 |  |  |  | 563,638 |
Collateralized mortgage obligations |  |  | 52 |  |  |  | - |  |  |  | 22 |  |  |  | 30 |
Corporate debt securities |  |  | 74,962 |  |  |  | 444 |  |  |  | 937 |  |  |  | 74,469 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 74 |  |  |  | 5,926 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 565 |  |  |  | 188 |  |  |  | 3,188 |
Other equity securities |  |  | 3,608 |  |  |  | 7,591 |  |  |  | - |  |  |  | 11,199 |
Total |  | $ | 1,283,808 |  |  | $ | 15,977 |  |  | $ | 1,316 |  |  | $ | 1,298,469 |
|  | December 31, 2015 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | 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 |  | $ | 1,595,723 |  |  | $ | 6,552 |  |  | $ | 15,923 |  |  | $ | 1,586,352 |
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 |  | $ | 289,859 |  |  | $ | 289,923 |
Due after one year through five years |  |  | 353,931 |  |  |  | 353,682 |
Due after five years through ten years |  |  | 75,117 |  |  |  | 75,076 |
Due after ten years (1) |  |  | 564,901 |  |  |  | 579,788 |
Total |  | $ | 1,283,808 |  |  | $ | 1,298,469 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | September 30, 2016 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 149,983 |  |  | $ | 24 |  |  | $ | - |  |  | $ | - |  |  | $ | 149,983 |  |  | $ | 24 |
U.S. government sponsored entities |  |  | 149,931 |  |  |  | 69 |  |  |  | - |  |  |  | - |  |  |  | 149,931 |  |  |  | 69 |
Mortgage-backed securities |  |  | 44 |  |  |  | 1 |  |  |  | 265 |  |  |  | 1 |  |  |  | 309 |  |  |  | 2 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 30 |  |  |  | 22 |  |  |  | 30 |  |  |  | 22 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 54,063 |  |  |  | 937 |  |  |  | 54,063 |  |  |  | 937 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,926 |  |  |  | 74 |  |  |  | 5,926 |  |  |  | 74 |
Preferred stock of government sponsored entities |  |  | 2,528 |  |  |  | 188 |  |  |  | - |  |  |  | - |  |  |  | 2,528 |  |  |  | 188 |
Total |  | $ | 302,486 |  |  | $ | 282 |  |  | $ | 60,284 |  |  | $ | 1,034 |  |  | $ | 362,770 |  |  | $ | 1,316 |
|  | December 31, 2015 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 224,289 |  |  | $ | 395 |  |  | $ | - |  |  | $ | - |  |  | $ | 224,289 |  |  | $ | 395 |
U.S. government sponsored entities |  |  | 148,160 |  |  |  | 1,840 |  |  |  | - |  |  |  | - |  |  |  | 148,160 |  |  |  | 1,840 |
Mortgage-backed securities |  |  | 1,025,342 |  |  |  | 11,398 |  |  |  | 6 |  |  |  | 1 |  |  |  | 1,025,348 |  |  |  | 11,399 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 36 |  |  |  | 27 |  |  |  | 36 |  |  |  | 27 |
Corporate debt securities |  |  | 9,950 |  |  |  | 50 |  |  |  | 43,525 |  |  |  | 1,475 |  |  |  | 53,475 |  |  |  | 1,525 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,833 |  |  |  | 167 |  |  |  | 5,833 |  |  |  | 167 |
Preferred stock of government sponsored entities |  |  | 2,488 |  |  |  | 228 |  |  |  | - |  |  |  | - |  |  |  | 2,488 |  |  |  | 228 |
Other equity securities |  |  | 158 |  |  |  | 342 |  |  |  | - |  |  |  | - |  |  |  | 158 |  |  |  | 342 |
Total |  | $ | 1,410,387 |  |  | $ | 14,253 |  |  | $ | 49,400 |  |  | $ | 1,670 |  |  | $ | 1,459,787 |  |  | $ | 15,923 |

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