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Note 6 - Goodwill and Intangibles - Core Deposit Intangibles (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance at the beginning of period | $ 14,970 | $ 17,450 |  |  |  |
Amortization expense | (2,149) | (2,266) | $ (1,692) |  |  |
Balance at the end of the period | 11,381 | 14,970 | 17,450 |  |  |
Net book value | 14,970 | 17,450 | 17,450 | $ 11,381 | $ 14,970 | $ 17,450
Core Deposits [Member] |  |  |  |  |  |
Balance at the beginning of period | 13,466 | 15,595 | 9,079 |  |  |
Amortization expense | (2,085) | (2,129) | (1,692) |  |  |
Balance at the end of the period | 11,381 | 13,466 | 15,595 |  |  |
Gross carrying amount |  |  |  | 19,255 | 19,255 | 19,255
Accumulated amortization |  |  |  | (7,874) | (5,789) | (3,660)
Net book value | $ 11,381 | $ 15,595 | 15,595 | $ 11,381 | $ 13,466 | $ 15,595
Core Deposits [Member] | Springfield Bancshares |  |  |  |  |  |
Merger |  |  | $ 8,208 |  |  |

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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 http://asc.fasb.org/extlink&oid=121586364&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 http://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 http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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