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Allowance for Credit Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 5,640,524	$ 5,605,935
Commercial and industrial | Other Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	22,226	131,908
One year before current fiscal year	124,397	92,577
Two years before current fiscal year	96,641	68,330
Three years before current fiscal year	65,030	28,808
Four years before current fiscal year	25,527	33,715
Prior	170,804	145,878
Revolving Loans Amortized Cost Basis	218,335	215,611
Revolving Loans Converted to Term	4,592	5,063
Total Loans	727,552	721,890
Current-period gross writeoffs
Current fiscal year	0	6
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	29
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	35
Commercial and industrial | Other Financing Receivable | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	21,184	130,993
One year before current fiscal year	122,804	92,335
Two years before current fiscal year	96,426	68,030
Three years before current fiscal year	64,762	28,237
Four years before current fiscal year	25,160	33,618
Prior	167,533	141,758
Revolving Loans Amortized Cost Basis	216,495	212,349
Revolving Loans Converted to Term	4,592	5,063
Total Loans	718,956	712,383
Commercial and industrial | Other Financing Receivable | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	1,042	915
One year before current fiscal year	858	196
Two years before current fiscal year	184	222
Three years before current fiscal year	199	242
Four years before current fiscal year	205	79
Prior	349	1,287
Revolving Loans Amortized Cost Basis	130	682
Revolving Loans Converted to Term	0	0
Total Loans	2,967	3,623
Commercial and industrial | Other Financing Receivable | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	735	46
Two years before current fiscal year	31	78
Three years before current fiscal year	69	329
Four years before current fiscal year	162	18
Prior	2,922	2,833
Revolving Loans Amortized Cost Basis	1,710	2,580
Revolving Loans Converted to Term	0	0
Total Loans	5,629	5,884
Commercial and industrial | PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	264
Three years before current fiscal year	233	140
Four years before current fiscal year	68	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	301	404
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial and industrial | PPP loans | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	264
Three years before current fiscal year	233	140
Four years before current fiscal year	68	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	301	404
Commercial and industrial | PPP loans | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	0	0
Commercial and industrial | PPP loans | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	0	0
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,581	24,924
One year before current fiscal year	29,717	11,935
Two years before current fiscal year	11,582	3,388
Three years before current fiscal year	2,705	3,170
Four years before current fiscal year	2,676	3,268
Prior	9,689	16,767
Revolving Loans Amortized Cost Basis	38,348	36,729
Revolving Loans Converted to Term	1,686	1,030
Total Loans	98,984	101,211
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial and industrial | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	2,581	24,924
One year before current fiscal year	29,717	11,935
Two years before current fiscal year	11,582	3,341
Three years before current fiscal year	2,661	3,114
Four years before current fiscal year	2,624	3,268
Prior	9,681	16,759
Revolving Loans Amortized Cost Basis	38,347	36,728
Revolving Loans Converted to Term	1,686	1,030
Total Loans	98,879	101,099
Commercial and industrial | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	47
Three years before current fiscal year	44	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	44	47
Commercial and industrial | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	56
Four years before current fiscal year	52	0
Prior	8	8
Revolving Loans Amortized Cost Basis	1	1
Revolving Loans Converted to Term	0	0
Total Loans	61	65
Commercial real estate | Other Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	61,676	246,016
One year before current fiscal year	256,427	333,515
Two years before current fiscal year	356,887	368,103
Three years before current fiscal year	372,397	310,093
Four years before current fiscal year	306,745	286,203
Prior	1,238,345	983,010
Revolving Loans Amortized Cost Basis	20,783	35,702
Revolving Loans Converted to Term	3,658	24,949
Total Loans	2,616,918	2,587,591
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial real estate | Other Financing Receivable | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	61,676	246,016
One year before current fiscal year	256,427	317,583
Two years before current fiscal year	341,242	365,975
Three years before current fiscal year	370,270	292,960
Four years before current fiscal year	289,733	272,722
Prior	1,165,957	921,201
Revolving Loans Amortized Cost Basis	19,507	34,346
Revolving Loans Converted to Term	3,658	24,949
Total Loans	2,508,470	2,475,752
Commercial real estate | Other Financing Receivable | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	632
Two years before current fiscal year	627	0
Three years before current fiscal year	0	17,133
Four years before current fiscal year	17,012	11,422
Prior	24,274	16,100
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	41,913	45,287
Commercial real estate | Other Financing Receivable | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	15,300
Two years before current fiscal year	15,018	2,128
Three years before current fiscal year	2,127	0
Four years before current fiscal year	0	2,059
Prior	48,114	45,709
Revolving Loans Amortized Cost Basis	1,276	1,356
Revolving Loans Converted to Term	0	0
Total Loans	66,535	66,552
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	417	14,668
One year before current fiscal year	14,236	37,256
Two years before current fiscal year	38,943	22,813
Three years before current fiscal year	22,508	21,001
Four years before current fiscal year	20,752	24,342
Prior	111,386	94,969
Revolving Loans Amortized Cost Basis	4,132	257
Revolving Loans Converted to Term	0	6,364
Total Loans	212,374	221,670
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial real estate | Agriculture | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	417	14,668
One year before current fiscal year	14,236	37,256
Two years before current fiscal year	38,943	22,813
Three years before current fiscal year	22,508	21,001
Four years before current fiscal year	20,752	23,794
Prior	109,821	93,890
Revolving Loans Amortized Cost Basis	4,132	257
Revolving Loans Converted to Term	0	6,364
Total Loans	210,809	220,043
Commercial real estate | Agriculture | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	378
Prior	1,378	1,033
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,378	1,411
Commercial real estate | Agriculture | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	170
Prior	187	46
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	187	216
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	9,265
One year before current fiscal year	0	2,793
Two years before current fiscal year	690	8,068
Three years before current fiscal year	7,413	2,501
Four years before current fiscal year	2,057	357
Prior	328	596
Revolving Loans Amortized Cost Basis	306,104	274,224
Revolving Loans Converted to Term	500	5,602
Total Loans	317,092	303,406
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Commercial real estate | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	9,265
One year before current fiscal year	0	2,793
Two years before current fiscal year	690	8,068
Three years before current fiscal year	7,413	2,501
Four years before current fiscal year	2,057	357
Prior	328	596
Revolving Loans Amortized Cost Basis	306,104	274,224
Revolving Loans Converted to Term	500	5,602
Total Loans	317,092	303,406
Commercial real estate | Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	0	0
Commercial real estate | Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	0	0
Residential Real Estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	72	2,378
One year before current fiscal year	2,105	2,237
Two years before current fiscal year	2,021	890
Three years before current fiscal year	862	529
Four years before current fiscal year	496	832
Prior	14,368	8,515
Revolving Loans Amortized Cost Basis	167,633	167,098
Revolving Loans Converted to Term	383	5,837
Total Loans	187,940	188,316
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	20
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	20
Residential Real Estate | Home equity | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	72	2,378
One year before current fiscal year	2,105	2,237
Two years before current fiscal year	2,021	890
Three years before current fiscal year	862	529
Four years before current fiscal year	496	832
Prior	13,575	8,178
Revolving Loans Amortized Cost Basis	164,952	164,205
Revolving Loans Converted to Term	383	5,837
Total Loans	184,466	185,086
Residential Real Estate | Home equity | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	793	337
Revolving Loans Amortized Cost Basis	2,681	2,893
Revolving Loans Converted to Term	0	0
Total Loans	3,474	3,230
Residential Real Estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	17,791	131,004
One year before current fiscal year	134,697	186,794
Two years before current fiscal year	184,236	256,456
Three years before current fiscal year	253,274	222,931
Four years before current fiscal year	219,617	110,477
Prior	561,538	465,613
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,371,153	1,373,275
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Residential Real Estate | Mortgages | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	17,791	131,004
One year before current fiscal year	134,697	186,401
Two years before current fiscal year	183,845	256,127
Three years before current fiscal year	252,852	221,945
Four years before current fiscal year	218,740	109,594
Prior	551,972	456,167
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	1,359,897	1,361,238
Residential Real Estate | Mortgages | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	393
Two years before current fiscal year	391	329
Three years before current fiscal year	422	986
Four years before current fiscal year	877	883
Prior	9,566	9,446
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	11,256	12,037
Consumer and other | Direct
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	32,279	50,297
One year before current fiscal year	21,706	13,327
Two years before current fiscal year	12,357	11,316
Three years before current fiscal year	10,551	5,157
Four years before current fiscal year	4,872	4,107
Prior	13,457	10,014
Revolving Loans Amortized Cost Basis	2,677	2,724
Revolving Loans Converted to Term	0	0
Total Loans	97,899	96,942
Current-period gross writeoffs
Current fiscal year	401	801
One year before current fiscal year	8	29
Two years before current fiscal year	2	16
Three years before current fiscal year	16	21
Four years before current fiscal year	5	83
Prior	10	28
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	442	978
Consumer and other | Direct | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	32,279	50,295
One year before current fiscal year	21,706	13,327
Two years before current fiscal year	12,354	11,316
Three years before current fiscal year	10,538	5,157
Four years before current fiscal year	4,872	4,037
Prior	13,201	9,857
Revolving Loans Amortized Cost Basis	2,670	2,723
Revolving Loans Converted to Term	0	0
Total Loans	97,620	96,712
Consumer and other | Direct | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	2
One year before current fiscal year	0	0
Two years before current fiscal year	3	0
Three years before current fiscal year	13	0
Four years before current fiscal year	0	70
Prior	256	157
Revolving Loans Amortized Cost Basis	7	1
Revolving Loans Converted to Term	0	0
Total Loans	279	230
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	97
Three years before current fiscal year	82	68
Four years before current fiscal year	54	432
Prior	485	244
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	621	841
Current-period gross writeoffs
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	53
Prior	3	14
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	3	67
Consumer and other | Indirect | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	97
Three years before current fiscal year	82	68
Four years before current fiscal year	54	402
Prior	452	234
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	588	801
Consumer and other | Indirect | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current fiscal year	0	0
One year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	30
Prior	33	10
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total Loans	$ 33	$ 40

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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