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Business Combinations - Carrying Value of Loans Sold (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Nov. 10, 2022	Jun. 24, 2022
Business Acquisition [Line Items]
Fair value of acquired loans			$ 26
Time	$ 736,527	$ 763,519
Total interest-bearing deposits	3,420,724	3,247,326
Total deposits	4,374,789	4,145,455
Demand	954,065	898,129
Total non-interest-bearing deposits	$ 954,065	$ 898,129
High Plains Bank [Member]
Business Acquisition [Line Items]
Demand, savings and money markets			12,889
Time			6,168
Total interest-bearing deposits			19,057
Total deposits			19,057
United Bank And Trust [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				$ 26,110
Demand, savings and money markets				28,615
Time				8,282
Total interest-bearing deposits				36,897
Total deposits				52,714
Demand				15,817
Total non-interest-bearing deposits				15,817
Commercial Real Estate [Member] \| United Bank And Trust [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				793
Commercial and Industrial [Member] \| United Bank And Trust [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				537
Residential Real Estate [Member] \| United Bank And Trust [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				521
Agricultural Real Estate [Member] \| United Bank And Trust [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				23,685
Consumer [Member] \| High Plains Bank [Member]
Business Acquisition [Line Items]
Fair value of acquired loans			$ 26
Consumer [Member] \| United Bank And Trust [Member]
Business Acquisition [Line Items]
Fair value of acquired loans				$ 574