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Note 4 - Investment Securities Available-for-sale (Details) - Securities Available-for-sale by Contractual Maturity - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
U. S. agency securities maturing: |  |
Amortized cost | $ 486,134 | $ 377,933
Estimated fair value | 487,869 | 382,343
US Government Agencies Debt Securities [Member] |  |
U. S. agency securities maturing: |  |
One year or less, amortized cost | 31,436 | 2,998
One year or less, estimated fair value | 31,361 | 3,051
After one year through five years, amortized cost | 18,826 | 19,947
After one year through five years, estimated fair value | 19,047 | 20,276
Five years through ten years, amortized cost | 6,513 | 6,489
Five years through ten years, estimated fair value | 6,567 | 6,567
Residential Mortgage Backed Securities [Member] |  |
U. S. agency securities maturing: |  |
Amortized cost | 299,709 | 241,120
Estimated fair value | 297,241 | 240,320
US States and Political Subdivisions Debt Securities [Member] |  |
U. S. agency securities maturing: |  |
One year or less, amortized cost | 4,450 | 2,410
One year or less, estimated fair value | 4,478 | 2,438
After one year through five years, amortized cost | 41,213 | 47,038
After one year through five years, estimated fair value | 43,720 | 49,607
Five years through ten years, amortized cost | 66,001 | 54,983
Five years through ten years, estimated fair value | 67,398 | 56,927
After ten years | 2,589 | 2,552
After ten years | 2,785 | 2,740
Corporate Debt Securities [Member] |  |
U. S. agency securities maturing: |  |
After one year through five years, amortized cost | 15,090 | 0
After one year through five years, estimated fair value | 14,938 | 0
Equity Investment Other [Member] |  |
U. S. agency securities maturing: |  |
Amortized cost | 307 | 396
Estimated fair value | $ 334 | $ 417

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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=27724398&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=27724398&loc=d3e27198-111563 + Details
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