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Loans - Risk Category of Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total | $ 3,978,919 |  | $ 3,977,900
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Total | 1,061 | $ 1,238 |
Commercial and Industrial Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 23,816 |  | 112,673
Year two | 103,087 |  | 135,337
Year three | 123,939 |  | 86,555
Year four | 85,341 |  | 30,101
Year five | 27,276 |  | 34,281
Prior | 71,701 |  | 49,183
Revolving Loans Amortized Cost Basis | 137,506 |  | 141,411
Total | 572,666 |  | 589,541
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 4 |  | 911
Year three | 17 |  | 32
Year four | 35 |  | 493
Year five | 0 |  | 7
Prior | 0 |  | 88
Revolving Loans Amortized Cost Basis | 46 |  | 261
Total | 102 | 733 | 1,792
Commercial and Industrial Loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 23,640 |  | 112,626
Year two | 103,041 |  | 134,590
Year three | 123,191 |  | 80,738
Year four | 81,060 |  | 28,492
Year five | 25,763 |  | 32,585
Prior | 66,102 |  | 45,764
Revolving Loans Amortized Cost Basis | 130,677 |  | 134,936
Total | 553,474 |  | 569,731
Commercial and Industrial Loans | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 176 |  | 47
Year two | 46 |  | 453
Year three | 477 |  | 128
Year four | 115 |  | 829
Year five | 1,208 |  | 0
Prior | 2,482 |  | 1,948
Revolving Loans Amortized Cost Basis | 3,526 |  | 3,048
Total | 8,030 |  | 6,453
Commercial and Industrial Loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 294
Year three | 271 |  | 5,689
Year four | 4,166 |  | 780
Year five | 305 |  | 1,696
Prior | 3,117 |  | 1,471
Revolving Loans Amortized Cost Basis | 3,303 |  | 3,427
Total | 11,162 |  | 13,357
Commercial and Industrial Loans | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Commercial Real Estate Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 77,985 |  | 314,475
Year two | 330,953 |  | 419,892
Year three | 421,992 |  | 487,582
Year four | 465,533 |  | 228,461
Year five | 212,943 |  | 148,419
Prior | 601,263 |  | 481,090
Revolving Loans Amortized Cost Basis | 38,139 |  | 41,916
Total | 2,148,808 |  | 2,121,835
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 56
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 308 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 308 | 0 | 56
Commercial Real Estate Loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 77,809 |  | 300,569
Year two | 316,801 |  | 416,874
Year three | 417,934 |  | 470,917
Year four | 449,347 |  | 225,668
Year five | 210,315 |  | 147,431
Prior | 578,412 |  | 458,821
Revolving Loans Amortized Cost Basis | 37,178 |  | 41,102
Total | 2,087,796 |  | 2,061,382
Commercial Real Estate Loans | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 176 |  | 13,906
Year two | 13,688 |  | 2,401
Year three | 2,788 |  | 11,155
Year four | 10,808 |  | 1,651
Year five | 2,091 |  | 259
Prior | 18,596 |  | 19,532
Revolving Loans Amortized Cost Basis | 961 |  | 638
Total | 49,108 |  | 49,542
Commercial Real Estate Loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 464 |  | 617
Year three | 1,270 |  | 5,510
Year four | 5,378 |  | 1,142
Year five | 537 |  | 729
Prior | 4,255 |  | 2,737
Revolving Loans Amortized Cost Basis | 0 |  | 176
Total | 11,904 |  | 10,911
Commercial Real Estate Loans | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Agricultural Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 13,287 |  | 46,443
Year two | 45,444 |  | 56,455
Year three | 53,379 |  | 40,954
Year four | 39,003 |  | 47,514
Year five | 45,484 |  | 25,755
Prior | 135,224 |  | 114,968
Revolving Loans Amortized Cost Basis | 68,912 |  | 91,714
Total | 400,733 |  | 423,803
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 2
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 25
Total | 0 | 0 | 27
Agricultural Loans | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 12,909 |  | 44,948
Year two | 43,953 |  | 56,291
Year three | 53,296 |  | 39,852
Year four | 38,147 |  | 42,279
Year five | 40,568 |  | 23,217
Prior | 119,627 |  | 100,391
Revolving Loans Amortized Cost Basis | 67,641 |  | 89,455
Total | 376,141 |  | 396,433
Agricultural Loans | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 183 |  | 1,495
Year two | 1,491 |  | 164
Year three | 83 |  | 903
Year four | 856 |  | 5,047
Year five | 4,805 |  | 2,338
Prior | 10,982 |  | 9,894
Revolving Loans Amortized Cost Basis | 1,271 |  | 2,259
Total | 19,671 |  | 22,100
Agricultural Loans | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 195 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 199
Year four | 0 |  | 188
Year five | 111 |  | 200
Prior | 4,615 |  | 4,683
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 4,921 |  | 5,270
Agricultural Loans | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Leases |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 7,886 |  | 36,848
Year two | 34,090 |  | 12,281
Year three | 11,224 |  | 10,634
Year four | 9,498 |  | 6,086
Year five | 5,086 |  | 4,788
Prior | 5,712 |  | 1,351
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 73,496 |  | 71,988
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 | 0 | 0
Leases | Pass |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 7,886 |  | 36,848
Year two | 34,090 |  | 12,281
Year three | 11,224 |  | 10,634
Year four | 9,498 |  | 6,086
Year five | 5,086 |  | 4,788
Prior | 5,712 |  | 1,351
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 73,496 |  | 71,988
Leases | Special Mention |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Leases | Substandard |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Leases | Doubtful |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 0
Year four | 0 |  | 0
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 0 |  | 0
Consumer Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 11,092 |  | 49,282
Year two | 43,922 |  | 21,480
Year three | 18,492 |  | 9,720
Year four | 8,005 |  | 2,756
Year five | 2,400 |  | 917
Prior | 2,380 |  | 1,912
Revolving Loans Amortized Cost Basis | 1,717 |  | 1,786
Total | 88,008 |  | 87,853
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 248 |  | 1,162
Year two | 75 |  | 42
Year three | 27 |  | 23
Year four | 15 |  | 71
Year five | 0 |  | 3
Prior | 0 |  | 1
Revolving Loans Amortized Cost Basis | 3 |  | 7
Total | 368 | 345 | 1,309
Home Equity Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 0 |  | 0
Year two | 238 |  | 417
Year three | 1,903 |  | 488
Year four | 303 |  | 150
Year five | 236 |  | 165
Prior | 3,536 |  | 1,309
Revolving Loans Amortized Cost Basis | 306,643 |  | 297,156
Total | 312,859 |  | 299,685
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 35 |  | 0
Year four | 99 |  | 55
Year five | 0 |  | 0
Prior | 0 |  | 24
Revolving Loans Amortized Cost Basis | 0 |  | 15
Total | 134 | 14 | 94
Residential Mortgage Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Year one | 12,231 |  | 56,317
Year two | 55,043 |  | 65,361
Year three | 64,121 |  | 86,170
Year four | 82,977 |  | 41,639
Year five | 40,223 |  | 17,940
Prior | 106,641 |  | 95,417
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | 361,236 |  | 362,844
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Year one | 0 |  | 0
Year two | 0 |  | 0
Year three | 0 |  | 22
Year four | 0 |  | 36
Year five | 0 |  | 0
Prior | 0 |  | 0
Revolving Loans Amortized Cost Basis | 0 |  | 0
Total | $ 0 | $ 26 | $ 58

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