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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, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans $ 6,066,645 $ 6,019,922
Commercial and industrial | Commercial and industrial other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 51,511 165,568
One year before current fiscal year 140,588 114,879
Two years before current fiscal year 104,757 61,199
Three years before current fiscal year 87,880 54,938
Four years before current fiscal year 51,873 19,459
Prior 163,886 145,768
Revolving Loans Amortized Cost Basis 274,324 257,789
Revolving Loans Converted to Term 2,332 35,968
Total Loans 877,151 855,568
Current-period gross writeoffs    
Current fiscal year 0 0
One year before current fiscal year 80 15
Two years before current fiscal year 67 30
Three years before current fiscal year 38 44
Four years before current fiscal year 0 21
Prior 0 432
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 185 542
Commercial and industrial | Commercial and industrial other | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 51,511 164,809
One year before current fiscal year 139,937 114,591
Two years before current fiscal year 104,517 60,984
Three years before current fiscal year 87,715 54,087
Four years before current fiscal year 51,230 19,311
Prior 162,874 144,785
Revolving Loans Amortized Cost Basis 273,078 256,621
Revolving Loans Converted to Term 2,139 35,968
Total Loans 873,001 851,156
Commercial and industrial | Commercial and industrial other | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 0 334
One year before current fiscal year 246 288
Two years before current fiscal year 221 174
Three years before current fiscal year 137 808
Four years before current fiscal year 111 144
Prior 394 375
Revolving Loans Amortized Cost Basis 150 157
Revolving Loans Converted to Term 0 0
Total Loans 1,259 2,280
Commercial and industrial | Commercial and industrial other | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 0 425
One year before current fiscal year 405 0
Two years before current fiscal year 19 41
Three years before current fiscal year 28 43
Four years before current fiscal year 532 4
Prior 618 608
Revolving Loans Amortized Cost Basis 1,096 1,011
Revolving Loans Converted to Term 193 0
Total Loans 2,891 2,132
Commercial and industrial | Agriculture    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 3,163 15,686
One year before current fiscal year 12,935 23,823
Two years before current fiscal year 25,938 9,893
Three years before current fiscal year 9,331 2,267
Four years before current fiscal year 2,019 1,701
Prior 7,390 11,304
Revolving Loans Amortized Cost Basis 32,514 42,438
Revolving Loans Converted to Term 398 2,895
Total Loans 93,688 110,007
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 3,163 15,686
One year before current fiscal year 12,935 23,823
Two years before current fiscal year 25,938 9,893
Three years before current fiscal year 9,331 2,233
Four years before current fiscal year 1,988 1,660
Prior 7,353 11,304
Revolving Loans Amortized Cost Basis 32,514 42,438
Revolving Loans Converted to Term 398 2,895
Total Loans 93,620 109,932
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 0
Three years before current fiscal year 0 34
Four years before current fiscal year 31 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 31 34
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 0
Four years before current fiscal year 0 41
Prior 37 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 37 41
Commercial real estate | Commercial and industrial other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 73,427 332,674
One year before current fiscal year 338,554 243,537
Two years before current fiscal year 276,613 327,483
Three years before current fiscal year 346,959 358,250
Four years before current fiscal year 355,754 294,265
Prior 1,408,789 1,147,068
Revolving Loans Amortized Cost Basis 19,969 56,069
Revolving Loans Converted to Term 7,217 16,958
Total Loans 2,827,282 2,776,304
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 | Commercial and industrial other | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 73,427 331,943
One year before current fiscal year 337,823 242,564
Two years before current fiscal year 275,679 324,510
Three years before current fiscal year 343,991 355,090
Four years before current fiscal year 351,697 277,220
Prior 1,329,497 1,088,575
Revolving Loans Amortized Cost Basis 19,042 50,632
Revolving Loans Converted to Term 7,217 16,958
Total Loans 2,738,373 2,687,492
Commercial real estate | Commercial and industrial other | 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 1,499
Three years before current fiscal year 1,494 599
Four years before current fiscal year 593 15,205
Prior 31,215 12,637
Revolving Loans Amortized Cost Basis 0 4,452
Revolving Loans Converted to Term 0 0
Total Loans 33,302 34,392
Commercial real estate | Commercial and industrial other | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 0 731
One year before current fiscal year 731 973
Two years before current fiscal year 934 1,474
Three years before current fiscal year 1,474 2,561
Four years before current fiscal year 3,464 1,840
Prior 48,077 45,856
Revolving Loans Amortized Cost Basis 927 985
Revolving Loans Converted to Term 0 0
Total Loans 55,607 54,420
Commercial real estate | Agriculture    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 8,210 23,754
One year before current fiscal year 24,501 11,594
Two years before current fiscal year 12,020 37,398
Three years before current fiscal year 36,942 21,510
Four years before current fiscal year 21,068 19,853
Prior 113,394 97,354
Revolving Loans Amortized Cost Basis 5,068 4,169
Revolving Loans Converted to Term 449 1,950
Total Loans 221,652 217,582
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 8,210 23,754
One year before current fiscal year 24,501 11,594
Two years before current fiscal year 12,020 37,398
Three years before current fiscal year 36,942 21,510
Four years before current fiscal year 21,068 19,853
Prior 113,053 96,967
Revolving Loans Amortized Cost Basis 5,068 4,169
Revolving Loans Converted to Term 449 1,950
Total Loans 221,311 217,195
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 0
Prior 198 217
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 198 217
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 0
Prior 143 170
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 143 170
Commercial real estate | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 0 13,160
One year before current fiscal year 17,426 744
Two years before current fiscal year 12,839 682
Three years before current fiscal year 20,366 5,003
Four years before current fiscal year 25,431 1,986
Prior 2,674 802
Revolving Loans Amortized Cost Basis 294,836 310,879
Revolving Loans Converted to Term 3,666 52,675
Total Loans 377,238 385,931
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 13,160
One year before current fiscal year 17,426 744
Two years before current fiscal year 12,839 682
Three years before current fiscal year 20,366 5,003
Four years before current fiscal year 25,431 1,986
Prior 2,674 802
Revolving Loans Amortized Cost Basis 277,534 293,479
Revolving Loans Converted to Term 3,666 52,675
Total Loans 359,936 368,531
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 17,302 17,400
Revolving Loans Converted to Term 0 0
Total Loans 17,302 17,400
Residential Real Estate | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 210 15,181
One year before current fiscal year 15,711 3,106
Two years before current fiscal year 3,185 2,383
Three years before current fiscal year 2,891 1,053
Four years before current fiscal year 956 784
Prior 16,590 13,587
Revolving Loans Amortized Cost Basis 165,025 165,497
Revolving Loans Converted to Term 944 2,603
Total Loans 205,512 204,194
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 | Home equity | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 210 15,181
One year before current fiscal year 15,711 3,106
Two years before current fiscal year 3,185 2,383
Three years before current fiscal year 2,891 1,053
Four years before current fiscal year 956 784
Prior 15,931 12,993
Revolving Loans Amortized Cost Basis 162,186 163,202
Revolving Loans Converted to Term 944 2,603
Total Loans 202,014 201,305
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 659 594
Revolving Loans Amortized Cost Basis 2,839 2,295
Revolving Loans Converted to Term 0 0
Total Loans 3,498 2,889
Residential Real Estate | Mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 21,477 106,698
One year before current fiscal year 109,306 131,170
Two years before current fiscal year 129,748 172,922
Three years before current fiscal year 170,441 240,044
Four years before current fiscal year 235,718 205,258
Prior 699,751 510,554
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 1,366,441 1,366,646
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 21,477 106,698
One year before current fiscal year 109,306 130,463
Two years before current fiscal year 129,055 172,310
Three years before current fiscal year 169,732 239,307
Four years before current fiscal year 234,890 204,310
Prior 688,337 500,169
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 1,352,797 1,353,257
Residential Real Estate | Mortgages | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 0 0
One year before current fiscal year 0 707
Two years before current fiscal year 693 612
Three years before current fiscal year 709 737
Four years before current fiscal year 828 948
Prior 11,414 10,385
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 13,644 13,389
Consumer and other | Direct    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 25,307 40,812
One year before current fiscal year 14,881 18,086
Two years before current fiscal year 15,764 10,046
Three years before current fiscal year 9,415 9,117
Four years before current fiscal year 8,361 3,957
Prior 14,488 11,562
Revolving Loans Amortized Cost Basis 2,405 2,583
Revolving Loans Converted to Term 0 0
Total Loans 90,621 96,163
Current-period gross writeoffs    
Current fiscal year 722 2,272
One year before current fiscal year 3 15
Two years before current fiscal year 0 11
Three years before current fiscal year 13 32
Four years before current fiscal year 17 10
Prior 20 229
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 775 2,569
Consumer and other | Direct | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 25,307 40,812
One year before current fiscal year 14,881 18,082
Two years before current fiscal year 15,761 10,022
Three years before current fiscal year 9,403 9,109
Four years before current fiscal year 8,361 3,953
Prior 14,402 11,485
Revolving Loans Amortized Cost Basis 2,391 2,575
Revolving Loans Converted to Term 0 0
Total Loans 90,506 96,038
Consumer and other | Direct | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current fiscal year 0 0
One year before current fiscal year 0 4
Two years before current fiscal year 3 24
Three years before current fiscal year 12 8
Four years before current fiscal year 0 4
Prior 86 77
Revolving Loans Amortized Cost Basis 14 8
Revolving Loans Converted to Term 0 0
Total Loans 115 125
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 0
Three years before current fiscal year 0 52
Four years before current fiscal year 42 23
Prior 114 154
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 156 229
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 4 29
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total 4 29
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 0
Three years before current fiscal year 0 52
Four years before current fiscal year 42 23
Prior 110 141
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans 152 216
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 0
Prior 4 13
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term 0 0
Total Loans $ 4 $ 13