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, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Greater Than 90 Days Past Due Still On Accrual	$ 256	$ 143
Nonaccrual	29,361	43,689
Total Loans	3,155,627	2,591,696
30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	6,026	2,804
60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,740	4,944
Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	3,118,244	2,540,116
Commercial Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,486,148
Greater Than 90 Days Past Due Still On Accrual	256
Nonaccrual	6,833	7,582
Total Loans	1,486,148	1,188,696
Commercial Real Estate [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	4,633	1,374
Commercial Real Estate [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	408	172
Commercial Real Estate [Member] \| Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,474,018	1,179,568
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	567,497
Nonaccrual	6,557	23,457
Total Loans	567,497	734,495
Commercial and Industrial [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	424	261
Commercial and Industrial [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	88
Commercial and Industrial [Member] \| Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	560,428	710,777
Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	638,087
Nonaccrual	5,075	2,955
Total Loans	638,087	381,958
Residential Real Estate [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	620	377
Residential Real Estate [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	1,126	4,712
Residential Real Estate [Member] \| Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	631,266	373,914
Agricultural Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	198,330
Greater Than 90 Days Past Due Still On Accrual		98
Nonaccrual	4,398	4,111
Total Loans	198,330	133,693
Agricultural Real Estate [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	28	260
Agricultural Real Estate [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	57
Agricultural Real Estate [Member] \| Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	193,847	129,224
Consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	98,590
Greater Than 90 Days Past Due Still On Accrual		45
Nonaccrual	323	272
Total Loans	98,590	58,532
Consumer [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	316	336
Consumer [Member] \| 60 to 89 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	61	60
Consumer [Member] \| Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	97,890	57,819
Agricultural [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	166,975
Nonaccrual	6,175	5,312
Total Loans	166,975	94,322
Agricultural [Member] \| 30 to 59 Days Past Due [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	5	196
Agricultural [Member] \| Loans Not Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Financing Receivables, Past Due	$ 160,795	$ 88,814

Amount of financing receivable 90 days or more past due and still accruing.

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