Business Combinations - Summary of the Amounts of Assets Sold and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Nov. 10, 2022	Jun. 24, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill			$ 53,101	$ 53,101	$ 53,101
High Plains Bank [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash and due from banks	$ 176
Loans	26
Premises and equipment	211
Core deposit intangibles	77
Total assets acquired	490
Deposits	19,057
Interest payable and other liabilities	7
Total liabilities assumed	19,064
Total identifiable net assets	(18,574)
Cash paid	18,152
Gain on branch Sale	$ (422)
United Bank And Trust [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash and due from banks		$ 508
Loans		26,110
Premises and equipment		1,225
Goodwill		1,364
Core deposit intangibles		164
Other assets		391
Total assets acquired		29,762
Deposits		52,714
Interest payable and other liabilities		19
Total liabilities assumed		52,733
Total identifiable net assets		(22,971)
Cash paid		22,431
Gain on branch Sale		$ (540)