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Note 3 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021
--- | --- | --- | --- | --- | ---
Securities held to maturity: |  |  |  |  |
Securities held to maturity, at amortized cost | $ 539,911 |  | $ 472,583 |  |
Securities held to maturity, gross unrealized gains | 1,564 |  | 49,715 |  |
Securities held to maturity, gross unrealized (losses) | (30,028) |  | (1) |  |
Securities held to maturity, fair value | 511,447 |  | 522,297 |  |
Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment Net Of Allowance For Credit Losses | 539,713 |  | 472,385 |  |
Allowance for credit losses HTM securities | 198 | $ 198 | 198 | $ 174 | $ 174
Securities available for sale: |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 408,715 |  | 329,994 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 215 |  | 9,157 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (69,193) |  | (1,321) |  |
Debt Securities, Available-for-sale | 339,737 |  | 337,830 |  |
Municipal securities. |  |  |  |  |
Securities held to maturity: |  |  |  |  |
Securities held to maturity, at amortized cost | 538,861 |  | 471,533 |  |
Securities held to maturity, gross unrealized gains | 1,564 |  | 49,715 |  |
Securities held to maturity, gross unrealized (losses) | (30,022) |  |  |  |
Securities held to maturity, fair value | 510,403 |  | 521,248 |  |
Allowance for credit losses HTM securities | 198 | $ 198 | 198 | 173 | 173
Securities available for sale: |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 241,292 |  | 163,253 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 23 |  | 5,228 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (55,972) |  | (215) |  |
Debt Securities, Available-for-sale | 185,343 |  | 168,266 |  |
U.S. treasuries and govt. sponsored agency securities |  |  |  |  |
Securities available for sale: |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 23,389 |  | 23,370 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 22 |  | 254 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,884) |  | (296) |  |
Debt Securities, Available-for-sale | 20,527 |  | 23,328 |  |
Residential mortgage-backed and related securities |  |  |  |  |
Securities available for sale: |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 76,680 |  | 92,431 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 2,672 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (7,836) |  | (780) |  |
Debt Securities, Available-for-sale | 68,844 |  | 94,323 |  |
Asset-backed securities |  |  |  |  |
Securities available for sale: |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 19,654 |  | 26,372 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 170 |  | 752 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (194) |  |  |  |
Debt Securities, Available-for-sale | 19,630 |  | 27,124 |  |
Other Securities |  |  |  |  |
Securities held to maturity: |  |  |  |  |
Securities held to maturity, at amortized cost | 1,050 |  | 1,050 |  |
Securities held to maturity, gross unrealized (losses) | (6) |  | (1) |  |
Securities held to maturity, fair value | 1,044 |  | 1,049 |  |
Allowance for credit losses HTM securities |  |  |  | $ 1 | $ 1
Securities available for sale: |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 47,700 |  | 24,568 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 251 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,307) |  | (30) |  |
Debt Securities, Available-for-sale | $ 45,393 |  | $ 24,789 |  |

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