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Allowance for Loan Losses - Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 4,070 | $ 3,624
Total Loans | 1,997,879 | 2,057,502
Past Due 90 Days and Accruing | 0 |
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,139 | 1,235
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 892 | 897
90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,039 | 1,492
Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,993,519 | 2,053,490
Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 290 | 388
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 340 | 192
Total Loans | 246,502 | 409,876
Commercial and Agriculture [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 249 | 117
Commercial and Agriculture [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 13 | 25
Commercial and Agriculture [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 78 | 50
Commercial and Agriculture [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 246,162 | 409,684
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 106 | 106
Total Loans | 295,452 | 278,413
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 4
Commercial Real Estate Owner Occupied [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 106 | 102
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 295,346 | 278,307
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4 | 6
Total Loans | 829,310 | 705,072
Commercial Real Estate Non Owner Occupied [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4 | 6
Commercial Real Estate Non Owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 829,306 | 705,066
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,569 | 3,240
Total Loans | 430,060 | 442,588
Residential Real Estate [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,848 | 1,059
Residential Real Estate [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 879 | 867
Residential Real Estate [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 842 | 1,314
Residential Real Estate [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 426,201 | 438,960
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Purchased Credit-Impaired Loans | 290 | 388
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 157,127 | 175,609
Real Estate Construction [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 157,127 | 175,609
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 4
Total Loans | 28,419 | 33,102
Farm Real Estate [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 4
Farm Real Estate [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 28,419 | 33,098
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 51 | 76
Total Loans | 11,009 | 12,842
Consumer and Other [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 42 | 59
Consumer and Other [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 1
Consumer and Other [Member] | 90 Days or Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9 | 16
Consumer and Other [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 10,958 | $ 12,766

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