Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 43,754	$ 44,315	$ 43,765	$ 44,168	$ 44,168
Provision for Credit Losses	625	550	1,525	1,650
Loans charged-off	(599)	(849)	(1,660)	(2,087)
Recoveries collected	166	250	316	535
Total ending allowance balance	43,946	44,266	43,946	44,266	43,765
Commercial and Industrial Loans
Allowance for Credit Losses [Roll Forward]
Beginning balance	7,266	13,572	7,921	13,749	13,749
Provision for Credit Losses	(75)	244	(631)	746
Loans charged-off	(29)	(343)	(131)	(1,077)	(1,792)
Recoveries collected	38	94	41	149
Total ending allowance balance	7,200	13,567	7,200	13,567	7,921
Commercial Real Estate Loans
Allowance for Credit Losses [Roll Forward]
Beginning balance	26,452	22,062	25,923	21,598	21,598
Provision for Credit Losses	142	(233)	974	169
Loans charged-off	0	0	(308)	0	(56)
Recoveries collected	4	5	9	67
Total ending allowance balance	26,598	21,834	26,598	21,834	25,923
Agricultural Loans
Allowance for Credit Losses [Roll Forward]
Beginning balance	3,650	3,887	3,837	4,188	4,188
Provision for Credit Losses	46	94	(141)	(207)
Loans charged-off	(1)	(25)	(1)	(25)	(27)
Recoveries collected	2	0	2	0
Total ending allowance balance	3,697	3,956	3,697	3,956	3,837
Leases
Allowance for Credit Losses [Roll Forward]
Beginning balance	373	227	346	209	209
Provision for Credit Losses	(5)	8	22	26
Loans charged-off	0	0	0	0	0
Recoveries collected	0	0	0	0
Total ending allowance balance	368	235	368	235	346
Consumer Loans
Allowance for Credit Losses [Roll Forward]
Beginning balance	785	609	759	595	595
Provision for Credit Losses	206	174	476	399
Loans charged-off	(384)	(284)	(753)	(628)	(1,309)
Recoveries collected	115	141	240	274
Total ending allowance balance	722	640	722	640	759
Home Equity Loans
Allowance for Credit Losses [Roll Forward]
Beginning balance	2,001	1,415	1,834	1,344	1,344
Provision for Credit Losses	55	45	349	100
Loans charged-off	0	(25)	(134)	(39)	(94)
Recoveries collected	2	1	9	31
Total ending allowance balance	2,058	1,436	2,058	1,436	1,834
Credit Cards
Allowance for Credit Losses [Roll Forward]
Beginning balance	395	263	383	257	257
Provision for Credit Losses	198	157	348	281
Loans charged-off	(185)	(141)	(333)	(261)
Recoveries collected	5	9	15	11
Total ending allowance balance	413	288	413	288	383
Residential Mortgage Loans
Allowance for Credit Losses [Roll Forward]
Beginning balance	2,832	2,280	2,762	2,228	2,228
Provision for Credit Losses	58	61	128	136
Loans charged-off	0	(31)	0	(57)	(58)
Recoveries collected	0	0	0	3
Total ending allowance balance	$ 2,890	$ 2,310	$ 2,890	$ 2,310	$ 2,762