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Loans, Allowance for Credit Losses - Loans and Amortized Cost Basis of Loans Under CECL Methodology (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	$ 20,187		$ 19,181
Individually evaluated for impairment	1,508		1,972
Total Allowance for Credit Losses - Loans for impairment	21,695	$ 22,797	21,153	$ 21,455	$ 21,652	$ 18,552
Collectively evaluated for impairment	2,309,860		2,235,955
Individually evaluated for impairment	21,142		12,881
Total Loans	2,331,002		2,248,836
Residential [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Total Loans	303,479		310,199
Commercial [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Total Loans	1,110,548		1,092,887
Construction [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Total Loans	178,706		195,826
Real Estate Loans [Member] | Residential [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	1,947		2,285
Individually evaluated for impairment	39		69
Total Allowance for Credit Losses - Loans for impairment	1,986	2,355	2,354	2,565	2,675	1,056
Collectively evaluated for impairment	351,748		358,358
Individually evaluated for impairment	1,506		1,632
Total Loans	353,254		359,990
Real Estate Loans [Member] | Commercial [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	9,188		9,033
Individually evaluated for impairment	99		145
Total Allowance for Credit Losses - Loans for impairment	9,287	10,283	9,178	9,185	9,274	10,120
Collectively evaluated for impairment	1,098,389		1,090,217
Individually evaluated for impairment	12,159		2,670
Total Loans	1,110,548		1,092,887
Real Estate Loans [Member] | Agricultural [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	3,813		3,247
Individually evaluated for impairment	2		17
Total Allowance for Credit Losses - Loans for impairment	3,815	3,770	3,264	3,475	3,579	4,589
Collectively evaluated for impairment	329,318		311,500
Individually evaluated for impairment	2,416		3,302
Total Loans	331,734		314,802
Real Estate Loans [Member] | Construction [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	1,471		1,664
Individually evaluated for impairment	0		286
Total Allowance for Credit Losses - Loans for impairment	1,471	1,627	1,950	1,833	1,667	801
Collectively evaluated for impairment	176,758		193,469
Individually evaluated for impairment	1,948		2,357
Total Loans	178,706		195,826
Consumer [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	510		557
Individually evaluated for impairment	857		939
Total Allowance for Credit Losses - Loans for impairment	1,367	1,211	1,496	1,720	1,259	135
Collectively evaluated for impairment	142,107		60,377
Individually evaluated for impairment	957		939
Total Loans	143,064		61,316
Other Commercial Loans [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	1,313		1,713
Individually evaluated for impairment	511		516
Total Allowance for Credit Losses - Loans for impairment	1,824	3,256	2,229	2,072	2,477	1,040
Collectively evaluated for impairment	132,323		134,472
Individually evaluated for impairment	1,962		1,696
Total Loans	134,285		136,168
Other Agricultural Loans [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	116		270
Individually evaluated for impairment	0		0
Total Allowance for Credit Losses - Loans for impairment	116	206	270	229	268	489
Collectively evaluated for impairment	24,343		30,388
Individually evaluated for impairment	194		285
Total Loans	24,537		30,673
State and Political Subdivision Loans [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	63		45
Individually evaluated for impairment	0		0
Total Allowance for Credit Losses - Loans for impairment	63	63	45	48	52	322
Collectively evaluated for impairment	54,874		57,174
Individually evaluated for impairment	0		0
Total Loans	54,874		57,174
Unallocated [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	1,766		367
Individually evaluated for impairment	0		0
Total Allowance for Credit Losses - Loans for impairment	1,766	$ 26	367	$ 328	$ 401	$ 0
Collectively evaluated for impairment	0		0
Individually evaluated for impairment	0		0
Total Loans	$ 0		$ 0

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