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Note 6 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost | $ 727,557 | $ 575,636
Gross unrealized gains | 15,409 | 21,444
Gross unrealized losses | (2,864) | (81)
Estimated fair value | 740,102 | 596,999
US Treasury Securities [Member] |  |
Amortized cost | 100,543 | 11,725
Gross unrealized gains | 382 | 328
Gross unrealized losses | (378) | 0
Estimated fair value | 100,547 | 12,053
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 113,012 | 106,337
Gross unrealized gains | 3,703 | 4,875
Gross unrealized losses | (357) | (13)
Estimated fair value | 116,358 | 111,199
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Amortized cost | 168,068 | 146,889
Gross unrealized gains | 2,013 | 3,337
Gross unrealized losses | (1,344) | (31)
Estimated fair value | 168,737 | 150,195
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 270,241 | 243,438
Gross unrealized gains | 5,692 | 8,182
Gross unrealized losses | (728) | (36)
Estimated fair value | 275,205 | 251,584
Corporate Debt Securities [Member] |  |
Amortized cost | 75,693 | 67,247
Gross unrealized gains | 3,619 | 4,722
Gross unrealized losses | (57) | (1)
Estimated fair value | $ 79,255 | $ 71,968

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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=123581744&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=123581744&loc=d3e27161-111563 + Details
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