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Allowance for Credit Losses - Aging Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 3,104,036	$ 3,081,230
Past Due 90 Days and Accruing	146	225
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	15,388	7,154
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,576	10,136
90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	12,284	7,298
Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	29,248	24,588
Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,074,788	3,056,642
Commercial and Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	330,627	328,488
Past Due 90 Days and Accruing	146
Commercial and Agriculture [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	9,315	825
Commercial and Agriculture [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	308	114
Commercial and Agriculture [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,800	1,374
Commercial and Agriculture [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,423	2,313
Commercial and Agriculture [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	319,204	326,175
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	378,095	374,367
Past Due 90 Days and Accruing		225
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	7
Commercial Real Estate Owner Occupied [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		225
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	7	225
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	378,088	374,142
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,246,025	1,225,991
Commercial Real Estate Non Owner Occupied [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans		69
Commercial Real Estate Non Owner Occupied [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	67	8,000
Commercial Real Estate Non Owner Occupied [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	8,234	2,514
Commercial Real Estate Non Owner Occupied [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	8,301	10,583
Commercial Real Estate Non Owner Occupied [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,237,724	1,215,408
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	773,349	763,869
Residential Real Estate [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,970	5,504
Residential Real Estate [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,196	1,634
Residential Real Estate [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,880	2,273
Residential Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	6,046	9,411
Residential Real Estate [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	767,303	754,458
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	297,589	305,992
Real Estate Construction [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	297,589	305,992
Farm Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	22,399	23,035
Farm Real Estate [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	22,399	23,035
Lease Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	44,570	46,900
Lease Financing Receivable [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,008	575
Lease Financing Receivable [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	0	351
Lease Financing Receivable [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	352	909
Lease Financing Receivable [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	3,360	1,835
Lease Financing Receivable [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	41,210	45,065
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	11,382	12,588
Consumer and Other [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	88	181
Consumer and Other [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	5	37
Consumer and Other [Member] | 90 Days or Greater Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	18	3
Consumer and Other [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	111	221
Consumer and Other [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 11,271	$ 12,367

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