Allowance for Credit Losses - Summary of Allowance for Credit Losses by Loan Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	$ 23,767	$ 4,666	$ 4,666
Charge-offs	(88)	0
Recoveries	18	2
Provision for credit losses	145	203
Ending balance	23,842	10,526	23,767
ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		5,655
Agriculture and Farmland [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	12	279	279
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	0	119
Ending balance	12	208	12
Agriculture and Farmland [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		(190)
Construction [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	959	274	274
Charge-offs	0	0
Recoveries	1	0
Provision for credit losses	563	26
Ending balance	1,523	813	959
Construction [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		513
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	2,940	583	583
Charge-offs	(6)	0
Recoveries	2	0
Provision for credit losses	26	64
Ending balance	2,962	930	2,940
Commercial and Industrial [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		283
Multifamily [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	1,483	480	480
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	109	(90)
Ending balance	1,592	730	1,483
Multifamily [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		340
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	6,572	635	635
Charge-offs	(6)	0
Recoveries	0	0
Provision for credit losses	(828)	198
Ending balance	5,738	1,593	6,572
Owner Occupied [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		760
Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	5,773	1,116	1,116
Charge-offs	(54)	0
Recoveries	0	0
Provision for credit losses	380	4
Ending balance	6,099	4,315	5,773
Non-owner Occupied [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		3,195
First Liens [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	4,778	1,029	1,029
Charge-offs	0	0
Recoveries	8	1
Provision for credit losses	(111)	(157)
Ending balance	4,675	1,508	4,778
First Liens [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		635
Second Liens and Lines of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	1,072	218	218
Charge-offs	0	0
Recoveries	6	1
Provision for credit losses	(7)	43
Ending balance	1,071	402	1,072
Second Liens and Lines of Credit [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		140
Municipal [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	79	12	12
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses	(11)	(3)
Ending balance	68	7	79
Municipal [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		(2)
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	99	40	40
Charge-offs	(22)	0
Recoveries	1	0
Provision for credit losses	24	(1)
Ending balance	$ 102	20	$ 99
Consumer [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Impact of adopting ASC 326		$ (19)