Loans and Allowance for Credit Losses - Schedule of Aging of Recorded Investment in Past Due Loans by Segment and Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual	$ 181	$ 279
Non-accrual	27,050	25,026
Total loans	3,500,816	3,332,901
30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	8,746	7,645
60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	3,896	3,770
Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	3,460,943	3,296,181
Commercial Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual	156	189
Non-accrual	7,458	5,447
Total loans	1,830,514	1,759,855
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	3,502	2,397
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	2,030	198
Commercial Real Estate [Member] | Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,817,368	1,751,624
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual	25	71
Non-accrual	7,798	5,041
Total loans	658,865	598,327
Commercial and Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,314	1,853
Commercial and Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	644	2,713
Commercial and Industrial [Member] | Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	649,084	588,649
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual	4,670	7,251
Total loans	566,766	556,328
Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	2,396	1,444
Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	634	676
Residential Real Estate [Member] | Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	559,066	546,957
Agricultural Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual	5,751	4,214
Total loans	267,248	196,114
Agricultural Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	457	949
Agricultural Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	312
Agricultural Real Estate [Member] | Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	260,728	190,951
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Non-accrual	781	603
Total loans	90,084	103,690
Consumer [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	666	443
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	196	118
Consumer [Member] | Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	88,441	102,526
Agricultural [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual		19
Non-accrual	592	2,470
Total loans	87,339	118,587
Agricultural [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	411	559
Agricultural [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	80	65
Agricultural [Member] | Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	$ 86,256	$ 115,474