Loans and Leases, Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	$ 75,283	$ 74,965	$ 74,965
Provision for credit losses	300	0	1,000
Charge-offs	(273)	(10)	(858)
Recoveries	113	63	176
Net (charge-offs)/recoveries	(160)	53
Balance at end of period	75,423	75,018	75,283
ACL for Unfunded Commitments [Roll Forward]
Balance at beginning of period	2,690	3,690	3,690
Provision for credit losses	0	0
Charge-offs	0	0
Recoveries	0	0
Net (charge-offs)/recoveries	0	0
Balance at end of period	2,690	3,690	2,690
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	77,973	78,655	78,655
Provision for credit losses	300	0
Charge-offs	(273)	(10)
Recoveries	113	63
Net (charge-offs)/recoveries	(160)	53
Balance at end of period	78,113	78,708	77,973
Real Estate [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	54,392	46,039	46,039
Provision for credit losses	122		8,359
Charge-offs	0		(29)
Recoveries	3		23
Balance at end of period	54,517		54,392
Commercial [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	20,382	26,093	26,093
Provision for credit losses	(69)		(5,711)
Charge-offs	0		0
Recoveries	0		0
Balance at end of period	20,313		20,382
Agricultural [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	23,615	7,744	7,744
Provision for credit losses	462		15,871
Charge-offs	0		0
Recoveries	0		0
Balance at end of period	24,077		23,615
Residential & Home Equity [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	7,340	7,770	7,770
Provision for credit losses	136		(424)
Charge-offs	0		(29)
Recoveries	3		23
Balance at end of period	7,479		7,340
Construction [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	3,055	4,432	4,432
Provision for credit losses	(407)		(1,377)
Charge-offs	0		0
Recoveries	0		0
Balance at end of period	2,648		3,055
Commercial & Industrial [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	7,791	13,380	13,380
Provision for credit losses	178		(4,939)
Charge-offs	(232)		(736)
Recoveries	106		86
Balance at end of period	7,843		7,791
Agricultural [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	6,725	8,872	8,872
Provision for credit losses	(274)		(2,163)
Charge-offs	(34)		0
Recoveries	0		16
Balance at end of period	6,417		6,725
Commercial Leases [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	6,153	6,537	6,537
Provision for credit losses	276		(384)
Charge-offs	0		0
Recoveries	0		0
Balance at end of period	6,429		6,153
Consumer and Other [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of period	222	$ 137	137
Provision for credit losses	(2)		127
Charge-offs	(7)		(93)
Recoveries	4		51
Balance at end of period	$ 217		$ 222