Business Combinations - Additional Information (Detail)			12 Months Ended
	Nov. 10, 2022 USD ($) Branch	Jun. 24, 2022 USD ($) Branch	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 01, 2024	Feb. 09, 2024
Business Acquisition [Line Items]
Goodwill			$ 53,101,000	$ 53,101,000	$ 53,101,000
Number of branches sold | Branch	1	3
High Plains Bank [Member]
Business Acquisition [Line Items]
Gain on acquisition	$ (422,000)
Branch Sell Related Costs				0	0
Rockhold and KansasLand [Member]
Business Acquisition [Line Items]
Total combined revenue			226,915,000	141,078,000
Net income			65,077,000	$ 7,518,000
United Bank And Trust [Member]
Business Acquisition [Line Items]
Goodwill		$ 1,364,000
Gain on acquisition		$ (540,000)
Branch Sell Related Costs					18,000
Branch Sell Related Costs After Tax					$ 14,000
Bank Of Kirksville [Member]
Business Acquisition [Line Items]
Acquisition-related costs			3,420,000
Acquisition-related costs after tax			2,597,000
Ownership percentage							100.00%
KansasLand Bank [Member]
Business Acquisition [Line Items]
Acquisition-related costs			1,041,000
Acquisition-related costs after tax			$ 791,000
Ownership percentage						100.00%