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Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 1,619,094 | $ 1,674,591
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 246,502 | 409,876
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 295,452 | 278,413
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 829,310 | 705,072
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 82,213 | 87,601
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 136,414 | 159,661
Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 28,419 | 33,102
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 784 | 866
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,541,115 | 1,525,796
Pass [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 244,787 | 401,636
Pass [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 290,617 | 248,316
Pass [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 764,181 | 604,909
Pass [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 77,594 | 81,409
Pass [Member] | Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 136,149 | 158,207
Pass [Member] | Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 27,023 | 30,486
Pass [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 764 | 833
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 32,316 | 84,017
Special Mention [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 526 | 4,472
Special Mention [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 3,119 | 19,429
Special Mention [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 28,042 | 58,270
Special Mention [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 164 | 668
Special Mention [Member] | Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 260 | 962
Special Mention [Member] | Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 205 | 216
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 45,663 | 64,778
Substandard [Member] | Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,189 | 3,768
Substandard [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,716 | 10,668
Substandard [Member] | Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 37,087 | 41,893
Substandard [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 4,455 | 5,524
Substandard [Member] | Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 5 | 492
Substandard [Member] | Farm Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | 1,191 | 2,400
Substandard [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans with credit exposures as assigned an internal risk grade | $ 20 | $ 33

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