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Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Intangible Assets | $ 12,186 | $ 12,688
Accumulated Amortization | (10,623) | (10,207)
Net Intangible Assets | 1,563 | 2,481
Core Deposits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Intangible Assets | 9,300 | 9,300
Accumulated Amortization | (8,004) | (7,257)
Net Intangible Assets | 1,296 | 2,043
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Intangible Assets | 2,886 | 3,388
Accumulated Amortization | (2,619) | (2,950)
Net Intangible Assets | $ 267 | $ 438

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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