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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | As of December 31, 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 124,801 |  |  | $ | - |  |  | $ | 50 |  |  | $ | 124,751 |
U.S. government agency entities |  |  | 6,066 |  |  |  | - |  |  |  | 195 |  |  |  | 5,871 |
U.S. government sponsored entities |  |  | 400,000 |  |  |  | - |  |  |  | 11,638 |  |  |  | 388,362 |
Mortgage-backed securities |  |  | 670,874 |  |  |  | 960 |  |  |  | 15,089 |  |  |  | 656,745 |
Collateralized mortgage obligations |  |  | 1,005 |  |  |  | - |  |  |  | 28 |  |  |  | 977 |
Corporate debt securities |  |  | 64,985 |  |  |  | 818 |  |  |  | - |  |  |  | 65,803 |
Total securities available-for-sale |  | $ | 1,267,731 |  |  | $ | 1,778 |  |  | $ | 27,000 |  |  | $ | 1,242,509 |
|  | As of 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 securities available-for-sale |  | $ | 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 |  | $ | 124,807 |  |  | $ | 124,757 |
Due after one year through five years |  |  | 465,813 |  |  |  | 455,010 |
Due after five years through ten years |  |  | 6,078 |  |  |  | 5,856 |
Due after ten years |  |  | 671,033 |  |  |  | 656,886 |
Total |  | $ | 1,267,731 |  |  | $ | 1,242,509 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | As of December 31, 2018 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |
|  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 124,751 |  |  | $ | 51 |  |  |  | 4 |  |  | $ | - |  |  | $ | - |  |  |  | - |  |  | $ | 124,751 |  |  | $ | 51 |  |  |  | 4 |
U.S. government agency entities |  |  | 3,388 |  |  |  | 77 |  |  |  | 2 |  |  |  | 2,483 |  |  |  | 118 |  |  |  | 2 |  |  |  | 5,871 |  |  |  | 195 |  |  |  | 4 |
U.S. government sponsored entities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 388,362 |  |  |  | 11,637 |  |  |  | 8 |  |  |  | 388,362 |  |  |  | 11,637 |  |  |  | 8 |
Mortgage-backed securities |  |  | 48,528 |  |  |  | 502 |  |  |  | 8 |  |  |  | 507,701 |  |  |  | 14,587 |  |  |  | 74 |  |  |  | 556,229 |  |  |  | 15,089 |  |  |  | 82 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 977 |  |  |  | 28 |  |  |  | 6 |  |  |  | 977 |  |  |  | 28 |  |  |  | 6 |
Total securities available-for-sale |  | $ | 176,667 |  |  | $ | 630 |  |  |  | 14 |  |  | $ | 899,523 |  |  | $ | 26,370 |  |  |  | 90 |  |  | $ | 1,076,190 |  |  | $ | 27,000 |  |  |  | 104 |
|  | As of December 31, 2017 |
|  | Temporarily Impaired Securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |  |  | Fair |  |  | Unrealized |  |  | No. of |
|  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |  |  | Value |  |  | Losses |  |  | Issuances |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |

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