Loan And Allowance For Credit Losses - Changes in Allowance for Loan Losses (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	$ 63,465,000	$ 66,534,000
Provision for loan losses	11,540,000	(2,089,000)
Recoveries	3,281,000	4,528,000
Charge-offs	2,452,000	(5,508,000)
Ending balance	75,834,000	63,465,000
Agricultural [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	1,597,000	1,255,000
Provision for loan losses	(702,000)	2,989,000
Recoveries	155,000	36,000
Charge-offs	9,000	(2,683,000)
Ending balance	1,041,000	1,597,000
C&I [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	12,280,000	13,609,000
Provision for loan losses	3,485,000	(1,879,000)
Recoveries	953,000	2,150,000
Charge-offs	589,000	(1,600,000)
Ending balance	16,129,000	12,280,000
Muncipal [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	348,000	1,552,000
Provision for loan losses	678,000	(1,204,000)
Ending balance	1,026,000	348,000
Construction & Development [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	17,627,000	13,512,000
Provision for loan losses	8,916,000	4,114,000
Recoveries		1,000
Charge-offs	100,000
Ending balance	26,443,000	17,627,000
Farm [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	663,000	1,876,000
Provision for loan losses	1,294,000	(1,323,000)
Recoveries		110,000
Ending balance	1,957,000	663,000
Non - Owner Occupied CRE [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	10,722,000	8,391,000
Provision for loan losses	(2,499,000)	1,635,000
Recoveries	852,000	702,000
Charge-offs		(6,000)
Ending balance	9,075,000	10,722,000
Owner Occupied CRE [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	10,828,000	12,347,000
Provision for loan losses	(1,062,000)	(2,109,000)
Recoveries	699,000	821,000
Charge-offs	537,000	(231,000)
Ending balance	9,928,000	10,828,000
Residential [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	8,133,000	12,601,000
Provision for loan losses	1,014,000	(4,471,000)
Recoveries	114,000	96,000
Charge-offs	186,000	(93,000)
Ending balance	9,075,000	8,133,000
Auto [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	896,000	1,020,000
Provision for loan losses	252,000	85,000
Recoveries	293,000	401,000
Charge-offs	596,000	(610,000)
Ending balance	845,000	896,000
Non - Auto [Member]
Loans And Leases Receivable Disclosure [Line Items]
Beginning balance	371,000	371,000
Provision for loan losses	164,000	74,000
Recoveries	215,000	211,000
Charge-offs	435,000	(285,000)
Ending balance	$ 315,000	$ 371,000