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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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