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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | As of December 31, 201 7 |
|  |  |  |  |  | Gros s |  |  | Gros s |  |  |  |  |
|  | Amortize d |  |  | Unrealize d |  |  | Unrealize d |  |  |  |  |
|  | Cos t |  |  | Gain s |  |  | Losse s |  |  | Fair Valu e |
|  | (In thousands ) |
Securities Available-for-Sal e |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 securities available-for-sale |  | $ | 1,336,345 |  |  | $ | 13,965 |  |  | $ | 16,684 |  |  | $ | 1,333,626 |
|  | As of December 31, 201 6 |
|  |  |  |  |  | Gros s |  |  | Gros s |  |  |  |  |
|  | Amortize d |  |  | Unrealize d |  |  | Unrealize d |  |  |  |  |
|  | Cos t |  |  | Gain s |  |  | Losse s |  |  | Fair Valu e |
|  | (In thousands ) |
Securities Available-for-Sal e |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 489,839 |  |  | $ | 35 |  |  | $ | 857 |  |  | $ | 489,017 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | - |  |  |  | 9,669 |  |  |  | 390,331 |
Mortgage-backed securities |  |  | 339,241 |  |  |  | 309 |  |  |  | 3,290 |  |  |  | 336,260 |
Collateralized mortgage obligations |  |  | 48 |  |  |  | - |  |  |  | 20 |  |  |  | 28 |
Corporate debt securities |  |  | 74,965 |  |  |  | 247 |  |  |  | 862 |  |  |  | 74,350 |
Mutual funds |  |  | 6,500 |  |  |  | - |  |  |  | 270 |  |  |  | 6,230 |
Preferred stock of government sponsored entities |  |  | 2,811 |  |  |  | 4,497 |  |  |  | - |  |  |  | 7,308 |
Other equity securities |  |  | 3,608 |  |  |  | 7,213 |  |  |  | - |  |  |  | 10,821 |
Total securities available-for-sale |  | $ | 1,317,012 |  |  | $ | 12,301 |  |  | $ | 14,968 |  |  | $ | 1,314,345 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities Available-for-Sal e |
|  | Amortized Cos t |  |  | Fair Valu e |
|  | (In thousands ) |
Due in one year or less |  | $ | 265,550 |  |  | $ | 265,231 |
Due after one year through five years |  |  | 465,195 |  |  |  | 456,804 |
Due after five years through ten years |  |  | 8,056 |  |  |  | 7,962 |
Due after ten years (1) |  |  | 597,544 |  |  |  | 603,629 |
Total |  | $ | 1,336,345 |  |  | $ | 1,333,626 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | As of December 31, 201 7 |
|  | Temporarily Impaired Securitie s |
|  | Less than 12 month s |  |  | 12 months or longe r |  |  | Tota l |
|  | Fai r |  |  | Unrealized |  |  | No. of |  |  | Fai r |  |  | Unrealized |  |  | No. o f |  |  | Fai r |  |  | Unrealized |  |  | No. of |
|  | Valu e |  |  | Losse s |  |  | Issuances |  |  | Valu e |  |  | Losse s |  |  | Issuance s |  |  | Valu e |  |  | Losse s |  |  | Issuances |
|  | (Dollars in thousands ) |
Securities Available-for-Sal e |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 199,823 |  |  | $ | 62 |  |  |  | 4 |  |  | $ | 49,697 |  |  | $ | 295 |  |  |  | 2 |  |  | $ | 249,520 |  |  | $ | 357 |  |  |  | 6 |
U.S. government agency entities |  |  | 5,711 |  |  |  | 70 |  |  |  | 3 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,711 |  |  |  | 70 |  |  |  | 3 |
U.S. government sponsored entities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 390,336 |  |  |  | 9,664 |  |  |  | 8 |  |  |  | 390,336 |  |  |  | 9,664 |  |  |  | 8 |
State and municipal securities |  |  | 1,914 |  |  |  | 30 |  |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,914 |  |  |  | 30 |  |  |  | 2 |
Mortgage-backed securities |  |  | 342,436 |  |  |  | 3,147 |  |  |  | 48 |  |  |  | 178,617 |  |  |  | 3,112 |  |  |  | 13 |  |  |  | 521,053 |  |  |  | 6,259 |  |  |  | 61 |
Collateralized mortgage obligations |  |  | 1,516 |  |  |  | 17 |  |  |  | 5 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,516 |  |  |  | 17 |  |  |  | 5 |
Corporate debt securities |  |  | 5,015 |  |  |  | 17 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,015 |  |  |  | 17 |  |  |  | 1 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 1 |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 1 |
Total securities available-for-sale |  | $ | 556,415 |  |  | $ | 3,343 |  |  |  | 63 |  |  | $ | 624,880 |  |  | $ | 13,341 |  |  |  | 24 |  |  | $ | 1,181,295 |  |  | $ | 16,684 |  |  |  | 87 |
|  | As of December 31, 201 6 |
|  | Temporarily Impaired Securitie s |
|  | Less than 12 month s |  |  | 12 months or longe r |  |  | Tota l |
|  | Fai r |  |  | Unrealized |  |  | No. of |  |  | Fai r |  |  | Unrealized |  |  | No. o f |  |  | Fai r |  |  | Unrealized |  |  | No. of |
|  | Valu e |  |  | Losse s |  |  | Issuances |  |  | Valu e |  |  | Losse s |  |  | Issuance s |  |  | Valu e |  |  | Losse s |  |  | Issuances |
|  | (Dollars in thousands ) |  |  |  |  |
Securities Available-for-Sal e |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 299,088 |  |  | $ | 857 |  |  |  | 6 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 299,088 |  |  | $ | 857 |  |  |  | 6 |
U.S. government sponsored entities |  |  | 390,331 |  |  |  | 9,669 |  |  |  | 8 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 390,331 |  |  |  | 9,669 |  |  |  | 8 |
Mortgage-backed securities |  |  | 328,236 |  |  |  | 3,288 |  |  |  | 16 |  |  |  | 62 |  |  |  | 2 |  |  |  | 3 |  |  |  | 328,298 |  |  |  | 3,290 |  |  |  | 19 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 28 |  |  |  | 20 |  |  |  | 1 |  |  |  | 28 |  |  |  | 20 |  |  |  | 1 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 29,138 |  |  |  | 862 |  |  |  | 2 |  |  |  | 29,138 |  |  |  | 862 |  |  |  | 2 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 1 |  |  |  | 6,230 |  |  |  | 270 |  |  |  | 1 |
Total securities available-for-sale |  | $ | 1,017,655 |  |  | $ | 13,814 |  |  |  | 30 |  |  | $ | 35,458 |  |  | $ | 1,154 |  |  |  | 7 |  |  | $ | 1,053,113 |  |  | $ | 14,968 |  |  |  | 37 |

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