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Note 7 - Debt Securities - Securities Available-for-sale (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost | $ 528,166,000 | $ 474,357,000
Gross unrealized gains | 20,743,000 | 5,934,000
Gross unrealized losses | (91,000) | (448,000)
Estimated fair value | 548,817,733 | 479,843,448
US Treasury Securities [Member] |  |
Amortized cost | 8,492,000 | 9,392,000
Gross unrealized gains | 364,000 | 64,000
Gross unrealized losses | 0 | (4,000)
Estimated fair value | 8,856,000 | 9,452,000
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 92,650,000 | 124,913,000
Gross unrealized gains | 5,340,000 | 1,609,000
Gross unrealized losses | (6,000) | (89,000)
Estimated fair value | 97,984,000 | 126,433,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Amortized cost | 130,706,000 | 80,295,000
Gross unrealized gains | 3,140,000 | 867,000
Gross unrealized losses | (50,000) | (34,000)
Estimated fair value | 133,796,000 | 81,128,000
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 226,574,000 | 193,745,000
Gross unrealized gains | 7,024,000 | 1,852,000
Gross unrealized losses | (35,000) | (295,000)
Estimated fair value | 233,563,000 | 195,302,000
Corporate Debt Securities [Member] |  |
Amortized cost | 69,744,000 | 66,012,000
Gross unrealized gains | 4,875,000 | 1,542,000
Gross unrealized losses | 0 | (26,000)
Estimated fair value | $ 74,619,000 | $ 67,528,000

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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