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Note 4 - Investment Securities Available-for-sale - Securities Available-for-sale by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized cost | $ 541,364 | $ 486,134
Estimated fair value | 538,108 | 487,869
US Government Agencies Debt Securities [Member] |  |
One year or less, amortized cost | 83,885 | 31,436
One year or less, estimated fair value | 82,548 | 31,361
After one year through five years, amortized cost | 20,736 | 18,826
After one year through five years, estimated fair value | 20,897 | 19,047
Five years through ten years, amortized cost | 2,804 | 6,513
Five years through ten years, estimated fair value | 2,697 | 6,567
Residential Mortgage Backed Securities [Member] |  |
Amortized cost, without maturity date | 329,606 | 299,709
Estimated fair value, without maturity date | 326,239 | 297,241
US States and Political Subdivisions Debt Securities [Member] |  |
One year or less, amortized cost | 1,056 | 4,450
One year or less, estimated fair value | 1,070 | 4,478
After one year through five years, amortized cost | 45,808 | 41,213
After one year through five years, estimated fair value | 46,865 | 43,720
Five years through ten years, amortized cost | 46,668 | 66,001
Five years through ten years, estimated fair value | 46,839 | 67,398
After ten years, amortized cost | 1,075 | 2,589
After ten years, estimated fair value | 1,156 | 2,785
After ten years, estimated fair value | 1,156 | 2,785
Corporate Debt Securities [Member] |  |
After one year through five years, amortized cost | 8,008 | 15,090
After one year through five years, estimated fair value | 8,079 | 14,938
After ten years, amortized cost | 1,500 |
After ten years, estimated fair value | 1,500 |
After ten years, estimated fair value | 1,500 |
Equity Investment Other [Member] |  |
Amortized cost, without maturity date | 218 | 307
Estimated fair value, without maturity date | $ 218 | $ 334

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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