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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
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Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost | $ 476,823 | $ 472,583 |
Securities held to maturity, gross unrealized gains | 10,649 | 49,715 |
Securities held to maturity, gross unrealized (losses) | (3,095) | (1) |
Securities held to maturity, fair value | 484,377 | 522,297 |
Securities held to maturity, at amortized cost, net of allowance for credit losses | 476,625 | 472,385 |
Allowance for credit losses HTM securities | 198 |  | $ 174
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 368,020 | 329,994 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,536 | 9,157 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (22,870) | (1,321) |
Debt Securities, Available-for-sale | 346,686 | 337,830 |
Municipal securities. |  |  |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost | 475,773 | 471,533 |
Securities held to maturity, gross unrealized gains | 10,649 | 49,715 |
Securities held to maturity, gross unrealized (losses) | (3,095) |  |
Securities held to maturity, fair value | 483,327 | 521,248 |
Allowance for credit losses HTM securities | 198 |  | 173
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 209,052 | 163,253 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 701 | 5,228 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (18,280) | (215) |
Debt Securities, Available-for-sale | 191,473 | 168,266 |
U.S. treasuries and govt. sponsored agency securities |  |  |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 22,655 | 23,370 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 37 | 254 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,312) | (296) |
Debt Securities, Available-for-sale | 21,380 | 23,328 |
Residential mortgage-backed and related securities |  |  |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 88,935 | 92,431 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 207 | 2,672 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,762) | (780) |
Debt Securities, Available-for-sale | 86,380 | 94,323 |
Asset-backed securities |  |  |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 22,859 | 26,372 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 449 | 752 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (76) |  |
Debt Securities, Available-for-sale | 23,232 | 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) |  | (1) |
Securities held to maturity, fair value | 1,050 | 1,049 |
Allowance for credit losses HTM securities |  |  | $ 1
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 24,519 | 24,568 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 142 | 251 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (440) | (30) |
Debt Securities, Available-for-sale | $ 24,221 | $ 24,789 |

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