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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Securities held to maturity: |  |
Securities held to maturity, at amortized cost | $ 472,583 | $ 476,165
Securities held to maturity, gross unrealized gains | 49,715 | 45,360
Securities held to maturity, gross unrealized (losses) | (1) | (248)
Securities held to maturity, fair value | 522,297 | 521,277
Securities held to maturity, at amortized cost, net of allowance for credit losses | 472,385 | 476,165
Allowance for credit losses HTM securities | 198 |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 329,994 | 350,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 9,157 | 12,430
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,321) | (524)
Debt Securities, Available-for-sale | 337,830 | 361,966
Municipal securities. |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 471,533 | 475,115
Securities held to maturity, gross unrealized gains | 49,715 | 45,360
Securities held to maturity, gross unrealized (losses) |  | (248)
Securities held to maturity, fair value | 521,248 | 520,227
Allowance for credit losses HTM securities | 198 |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 163,253 | 147,241
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 5,228 | 5,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (215) | (48)
Debt Securities, Available-for-sale | 168,266 | 152,408
U.S. treasuries and govt. sponsored agency securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 23,370 | 14,936
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 254 | 447
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (296) | (47)
Debt Securities, Available-for-sale | 23,328 | 15,336
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 92,431 | 127,670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,672 | 5,510
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (780) | (338)
Debt Securities, Available-for-sale | 94,323 | 132,842
Asset-backed securities |  |
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 26,372 | 39,663
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 752 | 1,111
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (91)
Debt Securities, Available-for-sale | 27,124 | 40,683
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 | 1,049 | 1,050
Securities available for sale: |  |
Debt Securities, Available-for-sale, Amortized Cost | 24,568 | 20,550
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 251 | 147
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (30) |
Debt Securities, Available-for-sale | $ 24,789 | $ 20,697

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