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NOTE 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost | $ 473,333 |  | $ 476,165
Securities held to maturity, gross unrealized gains | 50,129 |  | 45,360
Securities held to maturity, gross unrealized (losses) | (20) |  | (248)
Securities held to maturity, fair value | 523,442 |  | 521,277
Securities held to maturity, at amortized cost, net of allowance for credit losses | 473,159 |  | 476,165
Allowance for credit losses HTM securities | 174 | $ 174 |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 326,388 |  | 350,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 11,781 |  | 12,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (883) |  | (524)
Debt Securities, Available-for-sale | 337,286 |  | 361,966
Municipal securities. |  |  |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost | 472,283 |  | 475,115
Securities held to maturity, gross unrealized gains | 50,129 |  | 45,360
Securities held to maturity, gross unrealized (losses) | (20) |  | (248)
Securities held to maturity, fair value | 522,392 |  | 520,227
Allowance for credit losses HTM securities | 173 | 173 |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 163,607 |  | 147,241
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5,861 |  | 5,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (148) |  | (48)
Debt Securities, Available-for-sale | 169,320 |  | 152,408
U.S. govt. sponsored agency securities |  |  |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 14,310 |  | 14,936
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 504 |  | 447
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (144) |  | (47)
Debt Securities, Available-for-sale | 14,670 |  | 15,336
Residential mortgage-backed and related securities |  |  |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 102,625 |  | 127,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4,094 |  | 5,510
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (581) |  | (338)
Debt Securities, Available-for-sale | 106,138 |  | 132,842
Asset-backed securities |  |  |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 30,707 |  | 39,663
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,072 |  | 1,111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  |  | (91)
Debt Securities, Available-for-sale | 31,779 |  | 40,683
Other Securities |  |  |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost | 1,050 |  | 1,050
Securities held to maturity, fair value | 1,050 |  | 1,050
Allowance for credit losses HTM securities | 1 | $ 1 |
Securities available for sale: |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 15,139 |  | 20,550
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 250 |  | 147
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (10) |  |
Debt Securities, Available-for-sale | $ 15,379 |  | $ 20,697

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