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Note 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | $ 453,126 | $ 476,165
Securities held to maturity, gross unrealized gains | 38,312 | 45,360
Securities held to maturity, gross unrealized (losses) | (91) | (248)
Securities held to maturity, fair value | 491,347 | 521,277
Allowance for credit losses HTM securities | 174 |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 340,726 | 350,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8,956 | 12,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,809) | (524)
Debt Securities, Available-for-sale | 346,873 | 361,966
Municipal securities |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 452,076 | 475,115
Securities held to maturity, gross unrealized gains | 38,312 | 45,360
Securities held to maturity, gross unrealized (losses) | (91) | (248)
Securities held to maturity, fair value | 490,297 | 520,227
Allowance for credit losses HTM securities | 173 |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 160,703 | 147,241
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,492 | 5,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,622) | (48)
Debt Securities, Available-for-sale | 162,573 | 152,408
U.S. govt. sponsored agency securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 14,494 | 14,936
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 352 | 447
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (265) | (47)
Debt Securities, Available-for-sale | 14,581 | 15,336
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 115,230 | 127,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,742 | 5,510
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (920) | (338)
Debt Securities, Available-for-sale | 118,052 | 132,842
Asset-backed securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 38,620 | 39,663
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,197 | 1,111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2) | (91)
Debt Securities, Available-for-sale | 39,815 | 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 |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 11,679 | 20,550
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 173 | 147
Debt Securities, Available-for-sale | $ 11,852 | $ 20,697

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