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Note 3 - Investment Securities - Portfolio of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost | $ 721,799 | $ 535,182
Gross unrealized gains | 289 | 4,281
Gross unrealized losses | (87,204) | (4,956)
Securities available-for-sale | 634,884 | 534,507
US Government Agencies Debt Securities [Member] |  |
Amortized cost | 54,889 | 50,336
Gross unrealized gains | 0 | 649
Gross unrealized losses | (10,439) | (625)
Securities available-for-sale | 44,450 | 50,360
Residential Mortgage-Backed Securities [Member] |  |
Amortized cost | 475,263 | 317,111
Gross unrealized gains | 178 | 1,868
Gross unrealized losses | (57,863) | (2,884)
Securities available-for-sale | 417,578 | 316,095
Commercial Mortgage-Backed Securities [Member] |  |
Amortized cost | 25,485 | 10,814
Gross unrealized gains | 0 | 118
Gross unrealized losses | (4,381) | (463)
Securities available-for-sale | 21,104 | 10,469
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized cost | 157,247 | 145,045
Gross unrealized gains | 111 | 1,562
Gross unrealized losses | (14,462) | (982)
Securities available-for-sale | 142,896 | 145,625
Corporate Debt Securities [Member] |  |
Amortized cost | 7,000 | 8,968
Gross unrealized gains | 0 | 81
Gross unrealized losses | (26) | 0
Securities available-for-sale | 6,974 | 9,049
Asset-Backed Securities [Member] |  |
Amortized cost | 1,673 | 2,563
Gross unrealized gains | 0 | 3
Gross unrealized losses | (33) | (2)
Securities available-for-sale | 1,640 | 2,564
Other Debt Obligations [Member] |  |
Amortized cost | 242 | 195
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Securities available-for-sale | $ 242 | 195
Certificates of Deposit [Member] |  |
Amortized cost |  | 150
Gross unrealized gains |  | 0
Gross unrealized losses |  | 0
Securities available-for-sale |  | $ 150

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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