Loans - Aging Analysis of Past Due Loan Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans [Abstract]
Total past due	$ 2,335,388	$ 2,313,242
Total past due and non-accrual	20,523	25,701
Total past due and still accruing	2,314,865	2,287,541
30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	12,319	8,245
Total past due and non-accrual	797	2,428
Total past due and still accruing	11,522	5,817
60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	1,989	2,199
Total past due and non-accrual	283	0
Total past due and still accruing	1,706	2,199
90 Days Or Greater [Member]
Loans [Abstract]
Total past due	14,387	13,754
Total past due and non-accrual	14,350	13,478
Total past due and still accruing	37	276
Total Past Due [Member]
Loans [Abstract]
Total past due	28,695	24,198
Total past due and non-accrual	15,430	15,906
Total past due and still accruing	13,265	8,292
Current [Member]
Loans [Abstract]
Total past due	2,306,693	2,289,044
Total past due and non-accrual	5,093	9,795
Total past due and still accruing	2,301,600	2,279,249
Home Equity [Member]
Loans [Abstract]
Total past due	51,425	49,663
Commercial [Member]
Loans [Abstract]
Total past due	1,180,655	1,121,435
Construction [Member]
Loans [Abstract]
Total past due	107,867	164,326
Real Estate Loans [Member] \| Mortgages [Member]
Loans [Abstract]
Total past due	293,365	301,735
Real Estate Loans [Member] \| Mortgages [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	1,831	1,464
Real Estate Loans [Member] \| Mortgages [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	866	227
Real Estate Loans [Member] \| Mortgages [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	1,722	1,605
Real Estate Loans [Member] \| Mortgages [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	4,419	3,296
Real Estate Loans [Member] \| Mortgages [Member] \| Current [Member]
Loans [Abstract]
Total past due	288,946	298,439
Real Estate Loans [Member] \| Home Equity [Member]
Loans [Abstract]
Total past due	51,425	49,663
Real Estate Loans [Member] \| Home Equity [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	293	138
Real Estate Loans [Member] \| Home Equity [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	86	170
Real Estate Loans [Member] \| Home Equity [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	33	148
Real Estate Loans [Member] \| Home Equity [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	412	456
Real Estate Loans [Member] \| Home Equity [Member] \| Current [Member]
Loans [Abstract]
Total past due	51,013	49,207
Real Estate Loans [Member] \| Commercial [Member]
Loans [Abstract]
Total past due	1,180,655	1,121,435
Real Estate Loans [Member] \| Commercial [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	2,660	2,782
Real Estate Loans [Member] \| Commercial [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	384	1,360
Real Estate Loans [Member] \| Commercial [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	7,411	6,528
Real Estate Loans [Member] \| Commercial [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	10,455	10,670
Real Estate Loans [Member] \| Commercial [Member] \| Current [Member]
Loans [Abstract]
Total past due	1,170,200	1,110,765
Real Estate Loans [Member] \| Agricultural [Member]
Loans [Abstract]
Total past due	342,487	327,722
Real Estate Loans [Member] \| Agricultural [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	1,206	1,569
Real Estate Loans [Member] \| Agricultural [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	225	140
Real Estate Loans [Member] \| Agricultural [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	1,927	1,845
Real Estate Loans [Member] \| Agricultural [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	3,358	3,554
Real Estate Loans [Member] \| Agricultural [Member] \| Current [Member]
Loans [Abstract]
Total past due	339,129	324,168
Real Estate Loans [Member] \| Construction [Member]
Loans [Abstract]
Total past due	107,867	164,326
Real Estate Loans [Member] \| Construction [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	239	1,119
Real Estate Loans [Member] \| Construction [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	0	0
Real Estate Loans [Member] \| Construction [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	283	283
Real Estate Loans [Member] \| Construction [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	522	1,402
Real Estate Loans [Member] \| Construction [Member] \| Current [Member]
Loans [Abstract]
Total past due	107,345	162,924
Consumer [Member]
Loans [Abstract]
Total past due	109,458	109,505
Consumer [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	242	292
Consumer [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	239	20
Consumer [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	792	1,009
Consumer [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	1,273	1,321
Consumer [Member] \| Current [Member]
Loans [Abstract]
Total past due	108,185	108,184
Other Commercial Loans [Member]
Loans [Abstract]
Total past due	171,345	155,012
Other Commercial Loans [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	5,848	478
Other Commercial Loans [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	184	282
Other Commercial Loans [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	1,816	2,336
Other Commercial Loans [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	7,848	3,096
Other Commercial Loans [Member] \| Current [Member]
Loans [Abstract]
Total past due	163,497	151,916
Other Agricultural Loans [Member]
Loans [Abstract]
Total past due	27,142	29,662
Other Agricultural Loans [Member] \| 30 to 59 Days Past Due [Member]
Loans [Abstract]
Total past due	0	403
Other Agricultural Loans [Member] \| 60 to 89 Days Past Due [Member]
Loans [Abstract]
Total past due	5	0
Other Agricultural Loans [Member] \| 90 Days Or Greater [Member]
Loans [Abstract]
Total past due	403	0
Other Agricultural Loans [Member] \| Total Past Due [Member]
Loans [Abstract]
Total past due	408	403
Other Agricultural Loans [Member] \| Current [Member]
Loans [Abstract]
Total past due	26,734	29,259
State and Political Subdivision Loans [Member]
Loans [Abstract]
Total past due	51,644	54,182
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	$ 51,644	$ 54,182