Loans and Leases, Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	$ 74,965	$ 66,885
Provision for/(reversal of) credit losses	1,000	7,750
Charge-offs	(858)	(60)
Recoveries	176	390
Net (charge-offs)/recoveries	(682)	330
Balance at end of year	75,283	74,965
ACL for Unfunded Commitments [Roll Forward]
Balance at beginning of period	3,690	2,090
Provision for/(reversal of) credit losses	(1,000)	1,600
Charge-offs	0	0
Recoveries	0	0
Net (charge-offs)/recoveries	0	0
Balance at end of period	2,690	3,690
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	78,655	68,975
Provision for/(reversal of) credit losses	0	9,350
Charge-offs	(858)	(60)
Recoveries	176	390
Net (charge-offs)/recoveries	(682)	330
Balance at end of period	77,973	78,655
Real Estate [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	46,039	43,085
Provision for/(reversal of) credit losses	8,359	2,733
Charge-offs	(29)	(14)
Recoveries	23	235
Balance at end of year	54,392	46,039
Commercial [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	26,093	18,055
Provision for/(reversal of) credit losses	(5,711)	7,868
Charge-offs	0	0
Recoveries	0	170
Balance at end of year	20,382	26,093
Agricultural [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	7,744	14,496
Provision for/(reversal of) credit losses	15,871	(6,752)
Charge-offs	0	0
Recoveries	0	0
Balance at end of year	23,615	7,744
Residential and Home Equity [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	7,770	7,508
Provision for/(reversal of) credit losses	(424)	211
Charge-offs	(29)	(14)
Recoveries	23	65
Balance at end of year	7,340	7,770
Construction [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	4,432	3,026
Provision for/(reversal of) credit losses	(1,377)	1,406
Charge-offs	0	0
Recoveries	0	0
Balance at end of year	3,055	4,432
Commercial & Industrial [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	13,380	11,503
Provision for/(reversal of) credit losses	(4,939)	1,804
Charge-offs	(736)	0
Recoveries	86	73
Balance at end of year	7,791	13,380
Agricultural [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	8,872	10,202
Provision for/(reversal of) credit losses	(2,163)	(1,381)
Charge-offs	0	0
Recoveries	16	51
Balance at end of year	6,725	8,872
Commercial Leases [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	6,537	1,924
Provision for/(reversal of) credit losses	(384)	4,613
Charge-offs	0	0
Recoveries	0	0
Balance at end of year	6,153	6,537
Consumer and Other [Member]
ACL for Loans and Leases [Roll Forward]
Balance at beginning of year	137	171
Provision for/(reversal of) credit losses	127	(19)
Charge-offs	(93)	(46)
Recoveries	51	31
Balance at end of year	$ 222	$ 137