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Note 6 - Goodwill and Intangibles - Core Deposit Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Balance at the beginning of period | $ 9,349 | $ 11,381 |
Acquisition of GFED | 63,541 |  |
Amortization expense | (2,854) | (2,032) | $ (2,149)
Balance at the end of the period | 16,759 | 9,349 | 11,381
Net book value | 16,759 | 9,349 | 11,381
Core Deposits [Member] |  |  |
Balance at the beginning of period | 9,349 | 11,381 | 13,466
Amortization expense | (2,854) | (2,032) | (2,085)
Balance at the end of the period | 16,759 | 9,349 | 11,381
Gross carrying amount | 29,519 | 19,255 | 19,255
Accumulated amortization | (12,760) | (9,906) | (7,874)
Net book value | 16,759 | $ 9,349 | $ 11,381
Core Deposits [Member] | Guaranty Bank |  |  |
Acquisition of GFED | $ 10,264 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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