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Note 7 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 348,677 |  |  | $ | 8 |  |  | $ | 141 |  |  | $ | 348,544 |
U.S. government agency entities |  |  | 8,397 |  |  |  | - |  |  |  | 208 |  |  |  | 8,189 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | - |  |  |  | 16,041 |  |  |  | 383,959 |
Mortgage-backed securities |  |  | 676,855 |  |  |  | 189 |  |  |  | 18,756 |  |  |  | 658,288 |
Collateralized mortgage obligations |  |  | 1,233 |  |  |  | - |  |  |  | 30 |  |  |  | 1,203 |
Corporate debt securities |  |  | 74,980 |  |  |  | 786 |  |  |  | - |  |  |  | 75,766 |
Total |  | $ | 1,510,142 |  |  | $ | 983 |  |  | $ | 35,176 |  |  | $ | 1,475,949 |
|  | December 31, 2017 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 249,877 |  |  | $ | - |  |  | $ | 357 |  |  | $ | 249,520 |
U.S. government agency entities |  |  | 9,047 |  |  |  | 11 |  |  |  | 70 |  |  |  | 8,988 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | - |  |  |  | 9,664 |  |  |  | 390,336 |
State and municipal securities |  |  | 1,944 |  |  |  | - |  |  |  | 30 |  |  |  | 1,914 |
Mortgage-backed securities |  |  | 577,987 |  |  |  | 241 |  |  |  | 6,259 |  |  |  | 571,969 |
Collateralized mortgage obligations |  |  | 1,533 |  |  |  | - |  |  |  | 17 |  |  |  | 1,516 |
Corporate debt securities |  |  | 80,007 |  |  |  | 1,291 |  |  |  | 17 |  |  |  | 81,281 |
Mutual funds |  |  | 6,500 |  |  |  | - |  |  |  | 270 |  |  |  | 6,230 |
Preferred stock of government sponsored entities |  |  | 5,842 |  |  |  | 4,260 |  |  |  | - |  |  |  | 10,102 |
Other equity securities |  |  | 3,608 |  |  |  | 8,162 |  |  |  | - |  |  |  | 11,770 |
Total |  | $ | 1,336,345 |  |  | $ | 13,965 |  |  | $ | 16,684 |  |  | $ | 1,333,626 |
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 |  | $ | 358,743 |  |  | $ | 358,622 |
Due after one year through five years |  |  | 465,994 |  |  |  | 450,736 |
Due after five years through ten years |  |  | 4,478 |  |  |  | 4,314 |
Due after ten years |  |  | 680,927 |  |  |  | 662,277 |
Total |  | $ | 1,510,142 |  |  | $ | 1,475,949 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | June 30, 2018 |
|  | 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) |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 124,463 |  |  | $ | 49 |  |  | $ | 49,906 |  |  | $ | 92 |  |  | $ | 174,369 |  |  | $ | 141 |
U.S. government agency entities |  |  | 8,189 |  |  |  | 208 |  |  |  | - |  |  |  | - |  |  |  | 8,189 |  |  |  | 208 |
U.S. government sponsored entities |  |  | - |  |  |  | - |  |  |  | 383,959 |  |  |  | 16,041 |  |  |  | 383,959 |  |  |  | 16,041 |
Mortgage-backed securities |  |  | 465,499 |  |  |  | 12,349 |  |  |  | 160,485 |  |  |  | 6,407 |  |  |  | 625,984 |  |  |  | 18,756 |
Collateralized mortgage obligations |  |  | 1,203 |  |  |  | 30 |  |  |  | - |  |  |  | - |  |  |  | 1,203 |  |  |  | 30 |
Total debt securities |  | $ | 599,354 |  |  | $ | 12,636 |  |  | $ | 594,350 |  |  | $ | 22,540 |  |  | $ | 1,193,704 |  |  | $ | 35,176 |
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock of government sponsored entities |  |  | 7,480 |  |  |  | 2,623 |  |  |  | - |  |  |  | - |  |  |  | 7,480 |  |  |  | 2,623 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 6,082 |  |  |  | 148 |  |  |  | 6,082 |  |  |  | 148 |
Other equity securities |  |  | 9,569 |  |  |  | 2,200 |  |  |  | - |  |  |  | - |  |  |  | 9,569 |  |  |  | 2,200 |
Total equity securities |  | $ | 17,049 |  |  | $ | 4,823 |  |  | $ | 6,082 |  |  | $ | 148 |  |  | $ | 23,131 |  |  | $ | 4,971 |
|  | December 31, 2017 |
|  | 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 |  | $ | 199,823 |  |  | $ | 62 |  |  | $ | 49,697 |  |  | $ | 295 |  |  | $ | 249,520 |  |  | $ | 357 |
U.S. government agency entities |  |  | 5,711 |  |  |  | 70 |  |  |  | - |  |  |  | - |  |  |  | 5,711 |  |  |  | 70 |
U.S. government sponsored entities |  |  | - |  |  |  | - |  |  |  | 390,336 |  |  |  | 9,664 |  |  |  | 390,336 |  |  |  | 9,664 |
State and municipal securities |  |  | 1,914 |  |  |  | 30 |  |  |  | - |  |  |  | - |  |  |  | 1,914 |  |  |  | 30 |
Mortgage-backed securities |  |  | 342,436 |  |  |  | 3,147 |  |  |  | 178,617 |  |  |  | 3,112 |  |  |  | 521,053 |  |  |  | 6,259 |
Collateralized mortgage obligations |  |  | 1,516 |  |  |  | 17 |  |  |  | - |  |  |  | - |  |  |  | 1,516 |  |  |  | 17 |
Corporate debt securities |  |  | 5,015 |  |  |  | 17 |  |  |  | - |  |  |  | - |  |  |  | 5,015 |  |  |  | 17 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 6,230 |  |  |  | 270 |
Total |  | $ | 556,415 |  |  | $ | 3,343 |  |  | $ | 624,880 |  |  | $ | 13,341 |  |  | $ | 1,181,295 |  |  | $ | 16,684 |

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