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Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 1,661,553 | $ 1,619,094
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,568,272 | 1,541,115
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 49,897 | 32,316
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 43,384 | 45,663
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 226,540 | 246,502
Commercial and Agriculture [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 212,060 | 244,787
Commercial and Agriculture [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 13,572 | 526
Commercial and Agriculture [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 908 | 1,189
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 304,472 | 295,452
Commercial Real Estate Owner Occupied [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 295,442 | 290,617
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 7,693 | 3,119
Commercial Real Estate Owner Occupied [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,337 | 1,716
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 876,695 | 829,310
Commercial Real Estate Non Owner Occupied [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 812,154 | 764,181
Commercial Real Estate Non Owner Occupied [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 28,341 | 28,042
Commercial Real Estate Non Owner Occupied [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 36,200 | 37,087
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 87,724 | 82,213
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 83,570 | 77,594
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 91 | 164
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 4,063 | 4,455
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 141,940 | 136,414
Real Estate Construction [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 141,936 | 136,149
Real Estate Construction [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade |  | 260
Real Estate Construction [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 4 | 5
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 23,295 | 28,419
Farm Real Estate [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 22,239 | 27,023
Farm Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 200 | 205
Farm Real Estate [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 856 | 1,191
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 887 | 784
Consumer and Other [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 871 | 764
Consumer and Other [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 16 | $ 20

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