Allowance for Loan Losses - Credit Exposures by Internally Assigned Grades (Detail) $ in Thousands	Dec. 31, 2022 USD ($)
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	$ 2,049,931
Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	2,018,985
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	14,801
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	15,972
Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	173
Commercial and Agriculture [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	278,595
Commercial and Agriculture [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	273,291
Commercial and Agriculture [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	2,558
Commercial and Agriculture [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	2,746
Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	371,147
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	367,652
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	734
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	2,761
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	1,018,736
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	1,003,942
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	10,947
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	3,847
Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	119,991
Residential Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	114,021
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	183
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	5,787
Real Estate Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	198,955
Real Estate Construction [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	198,734
Real Estate Construction [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	221
Farm Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	24,708
Farm Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	24,283
Farm Real Estate [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	379
Farm Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	46
Lease Financing Receivables [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	36,797
Lease Financing Receivables [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	36,223
Lease Financing Receivables [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	401
Lease Financing Receivables [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	173
Consumer and Other [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	1,002
Consumer and Other [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	839
Consumer and Other [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans with credit exposures as assigned an internal risk grade	$ 163