Loans and Leases - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Loans and Leases [Abstract]
Balance at beginning of period	$ 76,169	$ 75,032	$ 75,283	$ 74,965	$ 74,965
Balance at beginning of period	2,800	3,690	2,690	3,690	3,690
Balance at beginning of period	78,969	78,722	77,973	78,655	78,655
Provision for/(reversal of) credit losses	700	1,000	2,290	1,000
Provision for/(reversal of) credit losses	0	(1,000)	110	(1,000)
Provision for/(reversal of) credit losses	700	0	2,400	0
Charge-offs	(962)	(255)	(1,804)	(281)	(858)
Charge-offs	0	0	0	0
Charge-offs	(962)	(255)	(1,804)	(281)
Recoveries	56	39	194	132
Recoveries	0	0	0	0
Recoveries	56	39	194	132
Net (charge-offs)/recoveries	(906)	(216)	(1,610)	(149)
Net (charge-offs)/recoveries	0	0	0	0
Net (charge-offs)/recoveries	(906)	(216)	(1,610)	(149)
Balance at end of period	75,963	75,816	75,963	75,816	75,283
Balance at end of period	2,800	2,690	2,800	2,690	2,690
Balance at end of period	78,763	78,506	78,763	78,506	77,973
Commercial [Member]
Loans and Leases [Abstract]
Balance at beginning of period	20,946	22,608	20,382	26,093	26,093
Provision for/(reversal of) credit losses	568	(1,570)	1,307	(5,055)
Charge-offs	0	0	(175)	0	0
Recoveries	0	0	0	0
Balance at end of period	21,514	21,038	21,514	21,038	20,382
Agricultural [Member]
Loans and Leases [Abstract]
Balance at beginning of period	24,469	16,486	23,615	7,744	7,744
Provision for/(reversal of) credit losses	812	6,932	1,846	15,674
Charge-offs	(939)	0	(1,119)	0	0
Recoveries	5	0	5	0
Balance at end of period	24,347	23,418	24,347	23,418	23,615
Residential & Home Equity [Member]
Loans and Leases [Abstract]
Balance at beginning of period	7,599	7,584	7,340	7,770	7,770
Provision for/(reversal of) credit losses	(126)	(593)	127	(793)
Charge-offs	0	(29)	0	(29)	(29)
Recoveries	0	5	6	19
Balance at end of period	7,473	6,967	7,473	6,967	7,340
Construction [Member]
Loans and Leases [Abstract]
Balance at beginning of period	2,766	2,165	3,055	4,432	4,432
Provision for/(reversal of) credit losses	54	1,308	(235)	(959)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	2,820	3,473	2,820	3,473	3,055
Real Estate [Member]
Loans and Leases [Abstract]
Balance at beginning of period	55,780	48,843	54,392	46,039	46,039
Provision for/(reversal of) credit losses	1,308	6,077	3,045	8,867
Charge-offs	(939)	(29)	(1,294)	(29)
Recoveries	5	5	11	19
Balance at end of period	56,154	54,896	56,154	54,896	54,392
Commercial & Industrial [Member]
Loans and Leases [Abstract]
Balance at beginning of period	7,326	10,972	7,791	13,380	13,380
Provision for/(reversal of) credit losses	30	(2,996)	(326)	(5,440)
Charge-offs	0	(200)	(232)	(200)	(736)
Recoveries	19	15	142	51
Balance at end of period	7,375	7,791	7,375	7,791	7,791
Agricultural [Member]
Loans and Leases [Abstract]
Balance at beginning of period	6,982	6,908	6,725	8,872	8,872
Provision for/(reversal of) credit losses	(375)	8	116	(1,959)
Charge-offs	0	0	(234)	0	0
Recoveries	24	13	24	16
Balance at end of period	6,631	6,929	6,631	6,929	6,725
Commercial Leases [Member]
Loans and Leases [Abstract]
Balance at beginning of period	5,858	7,597	6,153	6,537	6,537
Provision for/(reversal of) credit losses	(275)	(1,628)	(570)	(568)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Balance at end of period	5,583	5,969	5,583	5,969	6,153
Consumer and Other [Member]
Loans and Leases [Abstract]
Balance at beginning of period	223	712	222	137	137
Provision for/(reversal of) credit losses	12	(461)	25	100
Charge-offs	(23)	(26)	(44)	(52)	(93)
Recoveries	8	6	17	46
Balance at end of period	$ 220	$ 231	$ 220	$ 231	$ 222