Loans - Aging Analysis of Past Due Loan Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Loans [Abstract]
Total past due	$ 2,387,696	$ 2,271,271
Total past due and non-accrual	47,072	26,602
Total past due and still accruing	2,340,624	2,244,669
30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	4,303	5,910
Total past due and non-accrual	1,398	396
Total past due and still accruing	2,905	5,514
60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	1,965	4,373
Total past due and non-accrual	174	778
Total past due and still accruing	1,791	3,595
90 Days Or Greater [Member]
Loans [Abstract]
Total past due	35,845	22,680
Total past due and non-accrual	35,834	22,451
Total past due and still accruing	11	229
Total Past Due [Member]
Loans [Abstract]
Total past due	42,113	32,963
Total past due and non-accrual	37,406	23,625
Total past due and still accruing	4,707	9,338
Current [Member]
Loans [Abstract]
Total past due	2,345,583	2,238,308
Total past due and non-accrual	9,666	2,977
Total past due and still accruing	2,335,917	2,235,331
Home Equity [Member]
Loans [Abstract]
Total past due	53,108	52,308
Commercial [Member]
Loans [Abstract]
Total past due	1,276,050	1,218,514
Construction [Member]
Loans [Abstract]
Total past due	103,498	93,965
Real Estate Loans [Member] \| Mortgages [Member]
Loans [Abstract]
Total past due	283,082	288,664
Real Estate Loans [Member] \| Mortgages [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	865	2,737
Real Estate Loans [Member] \| Mortgages [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	1,106	1,073
Real Estate Loans [Member] \| Mortgages [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	1,290	1,675
Real Estate Loans [Member] \| Mortgages [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	3,261	5,485
Real Estate Loans [Member] \| Mortgages [Member] \| Current [Member]
Loans [Abstract]
Total past due	279,821	283,179
Real Estate Loans [Member] \| Home Equity [Member]
Loans [Abstract]
Total past due	53,108	52,308
Real Estate Loans [Member] \| Home Equity [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	186	146
Real Estate Loans [Member] \| Home Equity [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	72	17
Real Estate Loans [Member] \| Home Equity [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	57	181
Real Estate Loans [Member] \| Home Equity [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	315	344
Real Estate Loans [Member] \| Home Equity [Member] \| Current [Member]
Loans [Abstract]
Total past due	52,793	51,964
Real Estate Loans [Member] \| Commercial [Member]
Loans [Abstract]
Total past due	1,276,050	1,218,514
Real Estate Loans [Member] \| Commercial [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	1,858	1,733
Real Estate Loans [Member] \| Commercial [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	151	2,695
Real Estate Loans [Member] \| Commercial [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	30,153	9,871
Real Estate Loans [Member] \| Commercial [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	32,162	14,299
Real Estate Loans [Member] \| Commercial [Member] \| Current [Member]
Loans [Abstract]
Total past due	1,243,888	1,204,215
Real Estate Loans [Member] \| Agricultural [Member]
Loans [Abstract]
Total past due	370,505	347,448
Real Estate Loans [Member] \| Agricultural [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	730	1,020
Real Estate Loans [Member] \| Agricultural [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	579	158
Real Estate Loans [Member] \| Agricultural [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	2,117	1,982
Real Estate Loans [Member] \| Agricultural [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	3,426	3,160
Real Estate Loans [Member] \| Agricultural [Member] \| Current [Member]
Loans [Abstract]
Total past due	367,079	344,288
Real Estate Loans [Member] \| Construction [Member]
Loans [Abstract]
Total past due	103,498	93,965
Real Estate Loans [Member] \| Construction [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	0	0
Real Estate Loans [Member] \| Construction [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	0	233
Real Estate Loans [Member] \| Construction [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	951	283
Real Estate Loans [Member] \| Construction [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	951	516
Real Estate Loans [Member] \| Construction [Member] \| Current [Member]
Loans [Abstract]
Total past due	102,547	93,449
Consumer [Member]
Loans [Abstract]
Total past due	8,597	8,859
Consumer [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	62	1
Consumer [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	8	148
Consumer [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	493	785
Consumer [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	563	934
Consumer [Member] \| Current [Member]
Loans [Abstract]
Total past due	8,034	7,925
Other Commercial Loans [Member]
Loans [Abstract]
Total past due	178,977	179,166
Other Commercial Loans [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	246	256
Other Commercial Loans [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	49	49
Other Commercial Loans [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	373	7,500
Other Commercial Loans [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	668	7,805
Other Commercial Loans [Member] \| Current [Member]
Loans [Abstract]
Total past due	178,309	171,361
Other Agricultural Loans [Member]
Loans [Abstract]
Total past due	31,323	30,247
Other Agricultural Loans [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	356	17
Other Agricultural Loans [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	0	0
Other Agricultural Loans [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	411	403
Other Agricultural Loans [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	767	420
Other Agricultural Loans [Member] \| Current [Member]
Loans [Abstract]
Total past due	30,556	29,827
State and Political Subdivision Loans [Member]
Loans [Abstract]
Total past due	82,556	52,100
State and Political Subdivision Loans [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	0	0
State and Political Subdivision Loans [Member] \| Current [Member]
Loans [Abstract]
Total past due	$ 82,556	$ 52,100