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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Securities held to maturity: |  |
Securities held to maturity, at amortized cost | $ 400,646 | $ 401,913
Securities held to maturity, gross unrealized gains | 26,042 | 5,661
Securities held to maturity, gross unrealized (losses) | (143) | (6,804)
Securities held to maturity, fair value | 426,545 | 400,770
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 206,962 | 266,671
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,068 | 501
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (335) | (6,116)
Debt Securities, Available-for-sale | 210,695 | 261,056
US States and Political Subdivisions Debt Securities |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 399,596 | 400,863
Securities held to maturity, gross unrealized gains | 26,042 | 5,661
Securities held to maturity, gross unrealized (losses) | (143) | (6,803)
Securities held to maturity, fair value | 425,495 | 399,721
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 46,659 | 59,069
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,602 | 180
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (4) | (703)
Debt Securities, Available-for-sale | 48,257 | 58,546
US Government Agencies Debt Securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 19,872 | 37,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 283 | 39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (77) | (778)
Debt Securities, Available-for-sale | 20,078 | 36,411
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 118,724 | 163,698
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,045 | 182
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (182) | (4,631)
Debt Securities, Available-for-sale | 120,587 | 159,249
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 1,050 | 1,050
Securities held to maturity, gross unrealized (losses) |  | (1)
Securities held to maturity, fair value | 1,050 | 1,049
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 21,707 | 6,754
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 138 | 100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (72) | (4)
Debt Securities, Available-for-sale | $ 21,773 | $ 6,850

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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=118939692&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=118939692&loc=d3e27161-111563 + Details
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