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Note 4 - Investment Securities Available-for-Sale (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  |  |  |  |  | Gross |  |  |  | Gross |  |  | Estimated |
December 31, 2016 |  | Amortized |  |  | Unrealized |  |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 107,425 |  |  | $ | 519 |  |  |  | $ | 1,802 |  |  | $ | 106,142 |
Residential mortgage backed securities |  |  | 329,606 |  |  |  | 324 |  |  |  |  | 3,691 |  |  |  | 326,239 |
Municipal bonds |  |  | 94,607 |  |  |  | 1,723 |  |  |  |  | 400 |  |  |  | 95,930 |
Corporate bonds |  |  | 9,508 |  |  |  | 82 |  |  |  |  | 11 |  |  |  | 9,579 |
Other equity investments |  |  | 218 |  |  |  | - |  |  |  |  | - |  |  |  | 218 |
|  | $ | 541,364 |  |  | $ | 2,648 |  |  |  | $ | 5,904 |  |  | $ | 538,108 |
|  |  |  |  |  | Gross |  |  |  | Gross |  |  | Estimated |
December 31, 2015 |  | Amortized |  |  | Unrealized |  |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 56,775 |  |  | $ | 477 |  |  |  | $ | 277 |  |  | $ | 56,975 |
Residential mortgage backed securities |  |  | 299,709 |  |  |  | 692 |  |  |  |  | 3,160 |  |  |  | 297,241 |
Municipal bonds |  |  | 114,253 |  |  |  | 4,131 |  |  |  |  | 3 |  |  |  | 118,381 |
Corporate bonds |  |  | 15,090 |  |  |  | - |  |  |  |  | 152 |  |  |  | 14,938 |
Other equity investments |  |  | 307 |  |  |  | 27 |  |  |  |  | - |  |  |  | 334 |
|  | $ | 486,134 |  |  | $ | 5,327 |  |  |  | $ | 3,592 |  |  | $ | 487,869 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  |  |  |  |  | Less than |  |  | 12 Months |  |  |  |  |  |  |  |  |
|  |  |  |  |  | 12 Months |  |  | or Greater |  |  | Total |
|  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |
December 31, 2016 |  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(dollars in thousands) |  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U. S. agency securities |  |  | 27 |  |  | $ | 88,991 |  |  | $ | 1,764 |  |  | $ | 3,768 |  |  | $ | 38 |  |  | $ | 92,759 |  |  | $ | 1,802 |
Residential mortgage backed securities |  |  | 112 |  |  |  | 232,347 |  |  |  | 3,110 |  |  |  | 19,402 |  |  |  | 581 |  |  |  | 251,749 |  |  |  | 3,691 |
Municipal bonds |  |  | 16 |  |  |  | 34,743 |  |  |  | 400 |  |  |  | - |  |  |  | - |  |  |  | 34,743 |  |  |  | 400 |
Corporate bonds |  |  | 2 |  |  |  | 4,998 |  |  |  | 11 |  |  |  | - |  |  |  | - |  |  |  | 4,998 |  |  |  | 11 |
|  |  | 157 |  |  | $ | 361,079 |  |  | $ | 5,285 |  |  | $ | 23,170 |  |  | $ | 619 |  |  | $ | 384,249 |  |  | $ | 5,904 |
|  |  |  |  |  | Less than |  |  | 12 Months |  |  |  |  |  |  |  |  |
|  |  |  |  |  | 12 Months |  |  | or Greater |  |  | Total |
|  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |
December 31, 2015 |  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(dollars in thousands) |  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U. S. agency securities |  |  | 13 |  |  | $ | 32,927 |  |  | $ | 277 |  |  | $ | - |  |  | $ | - |  |  | $ | 32,927 |  |  | $ | 277 |
Residential mortgage backed securities |  |  | 92 |  |  |  | 157,871 |  |  |  | 1,438 |  |  |  | 58,954 |  |  |  | 1,722 |  |  |  | 216,825 |  |  |  | 3,160 |
Municipal bonds |  |  | 2 |  |  |  | 1,559 |  |  |  | 3 |  |  |  | - |  |  |  | - |  |  |  | 1,559 |  |  |  | 3 |
Corporate bonds |  |  | 4 |  |  |  | 14,938 |  |  |  | 152 |  |  |  | - |  |  |  | - |  |  |  | 14,938 |  |  |  | 152 |
|  |  | 111 |  |  | $ | 207,295 |  |  | $ | 1,870 |  |  | $ | 58,954 |  |  | $ | 1,722 |  |  | $ | 266,249 |  |  | $ | 3,592 |
Available-for-sale Securities [Table Text Block] |
|  | December 31, 2016 |  |  | December 31, 2015 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
(dollars in thousands) |  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
U. S. agency securities maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 83,885 |  |  | $ | 82,548 |  |  | $ | 31,436 |  |  | $ | 31,361 |
After one year through five years |  |  | 20,736 |  |  |  | 20,897 |  |  |  | 18,826 |  |  |  | 19,047 |
Five years through ten years |  |  | 2,804 |  |  |  | 2,697 |  |  |  | 6,513 |  |  |  | 6,567 |
Residential mortgage backed securities |  |  | 329,606 |  |  |  | 326,239 |  |  |  | 299,709 |  |  |  | 297,241 |
Municipal bonds maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  |  | 1,056 |  |  |  | 1,070 |  |  |  | 4,450 |  |  |  | 4,478 |
After one year through five years |  |  | 45,808 |  |  |  | 46,865 |  |  |  | 41,213 |  |  |  | 43,720 |
Five years through ten years |  |  | 46,668 |  |  |  | 46,839 |  |  |  | 66,001 |  |  |  | 67,398 |
After ten years |  |  | 1,075 |  |  |  | 1,156 |  |  |  | 2,589 |  |  |  | 2,785 |
Corporate bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After one year through five years |  |  | 8,008 |  |  |  | 8,079 |  |  |  | 15,090 |  |  |  | 14,938 |
After ten years |  |  | 1,500 |  |  |  | 1,500 |  |  |  | - |  |  |  | - |
Other equity investments |  |  | 218 |  |  |  | 218 |  |  |  | 307 |  |  |  | 334 |
|  | $ | 541,364 |  |  | $ | 538,108 |  |  | $ | 486,134 |  |  | $ | 487,869 |

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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 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: 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=73527792&loc=d3e27337-111563 Reference 3: 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=73527792&loc=d3e27198-111563 Reference 4: 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 5: 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=73527792&loc=d3e27161-111563 Reference 6: 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=73527792&loc=d3e27357-111563 Reference 7: 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=73527792&loc=d3e27290-111563 + 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=73527792&loc=d3e27290-111563 + Details
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