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Loans, Allowance for Credit Losses - Loans and Amortized Cost Basis of Loans Under CECL Methodology (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	$ 19,611	$ 19,181
Individually evaluated for impairment	1,987	1,972
Total Allowance for Credit Losses - Loans for impairment	21,598	21,153	$ 15,250	$ 18,552
Collectively evaluated for impairment	2,226,157	2,235,955
Individually evaluated for impairment	13,502	12,881
Total Loans	2,239,659	2,248,836
Residential [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Total Loans	308,589	310,199
Commercial [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Total Loans	1,115,900	1,092,887
Construction [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Total Loans	184,506	195,826
Real Estate Loans [Member] | Residential [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	2,291	2,285
Individually evaluated for impairment	56	69
Total Allowance for Credit Losses - Loans for impairment	2,347	2,354	1,195	1,056
Collectively evaluated for impairment	356,185	358,358
Individually evaluated for impairment	1,594	1,632
Total Loans	357,779	359,990
Real Estate Loans [Member] | Commercial [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	9,600	9,033
Individually evaluated for impairment	141	145
Total Allowance for Credit Losses - Loans for impairment	9,741	9,178	6,747	10,120
Collectively evaluated for impairment	1,113,415	1,090,217
Individually evaluated for impairment	2,485	2,670
Total Loans	1,115,900	1,092,887
Real Estate Loans [Member] | Agricultural [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	3,655	3,247
Individually evaluated for impairment	17	17
Total Allowance for Credit Losses - Loans for impairment	3,672	3,264	3,409	4,589
Collectively evaluated for impairment	315,805	311,500
Individually evaluated for impairment	2,608	3,302
Total Loans	318,413	314,802
Real Estate Loans [Member] | Construction [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	1,595	1,664
Individually evaluated for impairment	0	286
Total Allowance for Credit Losses - Loans for impairment	1,595	1,950	851	801
Collectively evaluated for impairment	180,223	193,469
Individually evaluated for impairment	4,283	2,357
Total Loans	184,506	195,826
Consumer [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	273	557
Individually evaluated for impairment	993	939
Total Allowance for Credit Losses - Loans for impairment	1,266	1,496	1,220	135
Collectively evaluated for impairment	52,027	60,377
Individually evaluated for impairment	1,074	939
Total Loans	53,101	61,316
Other Commercial Loans [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	1,900	1,713
Individually evaluated for impairment	780	516
Total Allowance for Credit Losses - Loans for impairment	2,680	2,229	712	1,040
Collectively evaluated for impairment	128,410	134,472
Individually evaluated for impairment	1,028	1,696
Total Loans	129,438	136,168
Other Agricultural Loans [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	174	270
Individually evaluated for impairment	0	0
Total Allowance for Credit Losses - Loans for impairment	174	270	250	489
Collectively evaluated for impairment	23,915	30,388
Individually evaluated for impairment	430	285
Total Loans	24,345	30,673
State and Political Subdivision Loans [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	65	45
Individually evaluated for impairment	0	0
Total Allowance for Credit Losses - Loans for impairment	65	45	42	322
Collectively evaluated for impairment	56,177	57,174
Individually evaluated for impairment	0	0
Total Loans	56,177	57,174
Unallocated [Member]
Loans And Leases Receivable, Allowance For Loan Losses [Abstract]
Collectively evaluated for impairment	58	367
Individually evaluated for impairment	0	0
Total Allowance for Credit Losses - Loans for impairment	58	367	$ 824	$ 0
Collectively evaluated for impairment	0	0
Individually evaluated for impairment	0	0
Total Loans	$ 0	$ 0

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