Business Combinations - Summary of the Amounts of Assets Acquired and Liabilities Assumed Recognized at the Merger/Acquisition Date (Detail) - USD ($) $ in Thousands	Jul. 01, 2024	Feb. 09, 2024
Bank Of Kirksville [Member]
Fair value of consideration:
Fair value of consideration		$ 44,304
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks		105,218
Loans		118,131
Premises and equipment		3,473
Core deposit intangibles		11,530
Other assets		3,255
Total assets acquired		406,236
Deposits		349,777
Federal funds purchased and retail repurchase agreements		8,818
Interest payable and other liabilities		2,037
Total liabilities assumed		360,632
Total identifiable net assets		45,604
Bargain purchase gain		(1,300)
Bank Of Kirksville [Member] | Available for Sale Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Available-for-sale securities		164,629
Bank Of Kirksville [Member] | Cash [Member]
Fair value of consideration:
Fair value of consideration		$ 44,304
KansasLand Bank [Member]
Fair value of consideration:
Fair value of consideration	$ 100
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and due from banks	1,361
Loans	27,926
Premises and equipment	372
Core deposit intangibles	506
Other assets	1,764
Total assets acquired	51,933
Deposits	42,418
Federal funds purchased and retail repurchase agreements	780
Federal Home Loan Bank advances	7,049
Bank stock loan	691
Interest payable and other liabilities	64
Total liabilities assumed	51,002
Total identifiable net assets	931
Bargain purchase gain	(831)
KansasLand Bank [Member] | Available for Sale Securities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed:
Available-for-sale securities	20,004
KansasLand Bank [Member] | Cash [Member]
Fair value of consideration:
Fair value of consideration	$ 100