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Note 6 - Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  | September 30, 2014 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 539,919 |  |  | $ | 198 |  |  | $ | 29 |  |  | $ | 540,088 |
Mortgage-backed securities |  |  | 703,312 |  |  |  | 1,085 |  |  |  | 21,073 |  |  |  | 683,324 |
Collateralized mortgage obligations |  |  | 80 |  |  |  | - |  |  |  | 34 |  |  |  | 46 |
Corporate debt securities |  |  | 94,941 |  |  |  | 751 |  |  |  | 1,355 |  |  |  | 94,337 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 183 |  |  |  | 5,817 |
Preferred stock of government sponsored entities |  |  | 7,196 |  |  |  | 2,056 |  |  |  | - |  |  |  | 9,252 |
Other equity securities |  |  | 3,608 |  |  |  | 3,620 |  |  |  | - |  |  |  | 7,228 |
Total |  | $ | 1,355,056 |  |  | $ | 7,710 |  |  | $ | 22,674 |  |  | $ | 1,340,092 |
|  | December 31, 2013 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
|  | (In thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 460,095 |  |  | $ | 99 |  |  | $ | 1 |  |  | $ | 460,193 |
Mortgage-backed securities |  |  | 1,010,294 |  |  |  | 7,049 |  |  |  | 64,529 |  |  |  | 952,814 |
Collateralized mortgage obligations |  |  | 5,929 |  |  |  | 231 |  |  |  | 54 |  |  |  | 6,106 |
Asset-backed securities |  |  | 123 |  |  |  | - |  |  |  | - |  |  |  | 123 |
Corporate debt securities |  |  | 154,955 |  |  |  | 298 |  |  |  | 4,949 |  |  |  | 150,304 |
Mutual funds |  |  | 6,000 |  |  |  | - |  |  |  | 275 |  |  |  | 5,725 |
Preferred stock of government sponsored entities |  |  | 569 |  |  |  | 10,834 |  |  |  | - |  |  |  | 11,403 |
Total |  | $ | 1,637,965 |  |  | $ | 18,511 |  |  | $ | 69,808 |  |  | $ | 1,586,668 |
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 |  | $ | 115,047 |  |  | $ | 115,156 |
Due after one year through five years |  |  | 446,739 |  |  |  | 447,662 |
Due after five years through ten years |  |  | 85,693 |  |  |  | 84,983 |
Due after ten years (1) |  |  | 707,577 |  |  |  | 692,291 |
Total |  | $ | 1,355,056 |  |  | $ | 1,340,092 |
(1) Equity securities are reported in this category |  |  |  |  |  |  |  |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | September 30, 2014 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 174,959 |  |  | $ | 29 |  |  | $ | - |  |  | $ | - |  |  | $ | 174,959 |  |  | $ | 29 |
Mortgage-backed securities |  |  | 92,436 |  |  |  | 151 |  |  |  | 551,854 |  |  |  | 20,922 |  |  |  | 644,290 |  |  |  | 21,073 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 46 |  |  |  | 34 |  |  |  | 46 |  |  |  | 34 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 63,645 |  |  |  | 1,355 |  |  |  | 63,645 |  |  |  | 1,355 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,817 |  |  |  | 183 |  |  |  | 5,817 |  |  |  | 183 |
Total |  | $ | 267,395 |  |  | $ | 180 |  |  | $ | 621,362 |  |  | $ | 22,494 |  |  | $ | 888,757 |  |  | $ | 22,674 |
|  | December 31, 2013 |
|  | Temporarily impaired securities |
|  | Less than 12 months |  |  | 12 months or longer |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  | (Dollars in thousands) |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 75,064 |  |  | $ | 1 |  |  | $ | - |  |  | $ | - |  |  | $ | 75,064 |  |  | $ | 1 |
Mortgage-backed securities |  |  | 792,012 |  |  |  | 64,526 |  |  |  | 272 |  |  |  | 2 |  |  |  | 792,284 |  |  |  | 64,528 |
Mortgage-backed securities-Non-agency |  |  | 94 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 94 |  |  |  | 1 |
Collateralized mortgage obligations |  |  | 68 |  |  |  | 4 |  |  |  | 301 |  |  |  | 50 |  |  |  | 369 |  |  |  | 54 |
Corporate debt securities |  |  | 9,970 |  |  |  | 30 |  |  |  | 100,081 |  |  |  | 4,919 |  |  |  | 110,051 |  |  |  | 4,949 |
Mutual funds |  |  | - |  |  |  | - |  |  |  | 5,724 |  |  |  | 275 |  |  |  | 5,724 |  |  |  | 275 |
Total securities available-for-sale |  | $ | 877,208 |  |  | $ | 64,562 |  |  | $ | 106,378 |  |  | $ | 5,246 |  |  | $ | 983,586 |  |  | $ | 69,808 |
Total investment securities |  | $ | 877,208 |  |  | $ | 64,562 |  |  | $ | 106,378 |  |  | $ | 5,246 |  |  | $ | 983,586 |  |  | $ | 69,808 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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