Loans, Past Due (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Recorded investment of past due [Abstract]
Total past due	$ 2,315,663	$ 2,313,242
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	23,545	25,701
Nonaccrual With a related allowance	3,921	5,648
Nonaccrual Without a related allowance	19,624	20,053
90 days or greater past due and accruing	1,393	276
Total non-performing loans	24,938	25,977
Financing receivables on accrual status [Abstract]
Total financing receivables and still accruing	$ 2,292,118	2,287,541
Minimum [Member]
Financing receivables on nonaccrual status [Abstract]
Period of past due after which loans considered as non accrual	90 days
Current [Member]
Recorded investment of past due [Abstract]
Total past due	$ 2,285,902	2,289,044
Financing receivables on nonaccrual status [Abstract]
Current and non-accrual	4,809	9,795
Financing receivable nonaccrual status	2,285,902	2,289,044
Financing receivables on accrual status [Abstract]
Current and still accruing	2,281,093	2,279,249
Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	29,761	24,198
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	18,736	15,906
Financing receivables on accrual status [Abstract]
Total past due and still accruing	11,025	8,292
30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	10,098	8,245
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	5,400	2,428
Financing receivables on accrual status [Abstract]
Total past due and still accruing	4,698	5,817
60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	5,459	2,199
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	525	0
Financing receivables on accrual status [Abstract]
Total past due and still accruing	4,934	2,199
90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	14,204	13,754
Financing receivables on nonaccrual status [Abstract]
Total past due and non-accrual	12,811	13,478
Financing receivables on accrual status [Abstract]
Total past due and still accruing	1,393	276
Home Equity [Member]
Recorded investment of past due [Abstract]
Total past due	49,051	49,663
Commercial [Member]
Recorded investment of past due [Abstract]
Total past due	1,117,240	1,121,435
Construction [Member]
Recorded investment of past due [Abstract]
Total past due	168,896	164,326
Real Estate Loans [Member] | Mortgages [Member]
Recorded investment of past due [Abstract]
Total past due	301,170	301,735
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	2,888	2,706
Nonaccrual With a related allowance	156	165
Nonaccrual Without a related allowance	2,732	2,541
90 days or greater past due and accruing	0	0
Total non-performing loans	2,888	2,706
Real Estate Loans [Member] | Mortgages [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	295,924	298,439
Real Estate Loans [Member] | Mortgages [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	5,246	3,296
Real Estate Loans [Member] | Mortgages [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	2,345	1,464
Real Estate Loans [Member] | Mortgages [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	1,522	227
Real Estate Loans [Member] | Mortgages [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	1,379	1,605
Real Estate Loans [Member] | Home Equity [Member]
Recorded investment of past due [Abstract]
Total past due	49,051	49,663
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	102	165
Nonaccrual With a related allowance	0	0
Nonaccrual Without a related allowance	102	165
90 days or greater past due and accruing	168	0
Total non-performing loans	270	165
Real Estate Loans [Member] | Home Equity [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	48,610	49,207
Real Estate Loans [Member] | Home Equity [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	441	456
Real Estate Loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	106	138
Real Estate Loans [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	82	170
Real Estate Loans [Member] | Home Equity [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	253	148
Real Estate Loans [Member] | Commercial [Member]
Recorded investment of past due [Abstract]
Total past due	1,117,240	1,121,435
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	11,280	14,364
Nonaccrual With a related allowance	2,085	2,099
Nonaccrual Without a related allowance	9,195	12,265
90 days or greater past due and accruing	74	0
Total non-performing loans	11,354	14,364
Real Estate Loans [Member] | Commercial [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	1,103,613	1,110,765
Real Estate Loans [Member] | Commercial [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	13,627	10,670
Real Estate Loans [Member] | Commercial [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	6,083	2,782
Real Estate Loans [Member] | Commercial [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	3,476	1,360
Real Estate Loans [Member] | Commercial [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	4,068	6,528
Real Estate Loans [Member] | Agricultural [Member]
Recorded investment of past due [Abstract]
Total past due	329,985	327,722
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	3,702	4,062
Nonaccrual With a related allowance	0	0
Nonaccrual Without a related allowance	3,702	4,062
90 days or greater past due and accruing	314	269
Total non-performing loans	4,016	4,331
Real Estate Loans [Member] | Agricultural [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	326,114	324,168
Real Estate Loans [Member] | Agricultural [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	3,871	3,554
Real Estate Loans [Member] | Agricultural [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	1,251	1,569
Real Estate Loans [Member] | Agricultural [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	117	140
Real Estate Loans [Member] | Agricultural [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	2,503	1,845
Real Estate Loans [Member] | Construction [Member]
Recorded investment of past due [Abstract]
Total past due	168,896	164,326
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,402	283
Nonaccrual With a related allowance	0	0
Nonaccrual Without a related allowance	1,402	283
90 days or greater past due and accruing	789	0
Total non-performing loans	2,191	283
Real Estate Loans [Member] | Construction [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	166,705	162,924
Real Estate Loans [Member] | Construction [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	2,191	1,402
Real Estate Loans [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	1,119
Real Estate Loans [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
Real Estate Loans [Member] | Construction [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	2,191	283
Consumer [Member]
Recorded investment of past due [Abstract]
Total past due	129,943	133,207
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	976	1,002
Nonaccrual With a related allowance	976	1,002
Nonaccrual Without a related allowance	0	0
90 days or greater past due and accruing	2	7
Total non-performing loans	978	1,009
Consumer [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	128,877	131,886
Consumer [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	1,066	1,321
Consumer [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	52	292
Consumer [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	37	20
Consumer [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	977	1,009
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
Total past due	137,529	131,310
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	2,784	2,582
Nonaccrual With a related allowance	704	2,382
Nonaccrual Without a related allowance	2,080	200
90 days or greater past due and accruing	46	0
Total non-performing loans	2,830	2,582
Other Commercial Loans [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	134,713	128,214
Other Commercial Loans [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	2,816	3,096
Other Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	261	478
Other Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	125	282
Other Commercial Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	2,430	2,336
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
Total past due	28,488	29,662
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	411	537
Nonaccrual With a related allowance	0	0
Nonaccrual Without a related allowance	411	537
90 days or greater past due and accruing	0	0
Total non-performing loans	411	537
Other Agricultural Loans [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	27,985	29,259
Other Agricultural Loans [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	503	403
Other Agricultural Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	403
Other Agricultural Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	100	0
Other Agricultural Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	403	0
State and Political Subdivision Loans [Member]
Recorded investment of past due [Abstract]
Total past due	53,361	54,182
State and Political Subdivision Loans [Member] | Current [Member]
Recorded investment of past due [Abstract]
Total past due	53,361	54,182
State and Political Subdivision Loans [Member] | Total Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] | 30 to 59 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] | 60 to 89 Days Past Due [Member]
Recorded investment of past due [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] | 90 Days Or Greater [Member]
Recorded investment of past due [Abstract]
Total past due	$ 0	$ 0