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Loans - Financing Receivable, Gross Charge-Offs By Year of Origination (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | $ 1,194,235 |  | $ 1,194,235 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 810,091 |  | 810,091 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 473,001 |  | 473,001 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 396,346 |  | 396,346 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 244,404 |  | 244,404 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 511,946 |  | 511,946 |
Financing Receivable, Excluding Accrued Interest, Revolving | 2,340,836 |  | 2,340,836 |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 4,163 | $ 4,282 | 8,499 | $ 6,426
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 266,151 |  | 266,151 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 163,016 |  | 163,016 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 14,498 |  | 14,498 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 36,094 |  | 36,094 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 15,612 |  | 15,612 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 3,465 |  | 3,465 |
Financing Receivable, Excluding Accrued Interest, Revolving | 808,989 |  | 808,989 |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 0 | 79 | 52 | 79
Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 712,432 |  | 712,432 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,361,243 |  | 1,361,243 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 1,321,385 |  | 1,321,385 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1,515,319 |  | 1,515,319 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,106,557 |  | 1,106,557 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 1,607,253 |  | 1,607,253 |
Financing Receivable, Excluding Accrued Interest, Revolving | 184,828 |  | 184,828 |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 4,639 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 269,964 |  | 269,964 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 625,953 |  | 625,953 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 449,097 |  | 449,097 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 478,934 |  | 478,934 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 107,518 |  | 107,518 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 89 |  | 89 |
Financing Receivable, Excluding Accrued Interest, Revolving | 144,145 |  | 144,145 |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff |  |  | 0 |
Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 1,292 | 408 | 2,250 | 2,077
Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 7,290 | 8,360 | 14,134 | 16,617
Loans Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff | 15,384 | $ 13,251 | 29,574 | $ 25,321
Nonperforming Financial Instruments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 11,812 |  | 11,812 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 2,587 |  | 2,587 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 9,296 |  | 9,296 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 4,923 |  | 4,923 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 2,676 |  | 2,676 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 10,218 |  | 10,218 |
Financing Receivable, Excluding Accrued Interest, Revolving | 5,409 |  | 5,409 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 15,472 |  | 15,472 |
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 8,896 |  | 8,896 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 2,402 |  | 2,402 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 6,228 |  | 6,228 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 3,609 |  | 3,609 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,493 |  | 1,493 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2,184 |  | 2,184 |
Financing Receivable, Excluding Accrued Interest, Revolving | 2,652 |  | 2,652 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 10,551 |  | 10,551 |
Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 1,343 |  | 1,343 |
Financing Receivable, Excluding Accrued Interest, Revolving | 2,677 |  | 2,677 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Nonperforming Financial Instruments [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 2,916 |  | 2,916 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 3,013 |  | 3,013 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 1,314 |  | 1,314 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1,183 |  | 1,183 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 4,378 |  | 4,378 |
Financing Receivable, Excluding Accrued Interest, Revolving | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 1,254 |  | 1,254 |
Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Nonperforming Financial Instruments [Member] | Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 47 |  | 47 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 2,313 |  | 2,313 |
Financing Receivable, Excluding Accrued Interest, Revolving | 80 |  | 80 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 3,667 |  | 3,667 |
Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 185 |  | 185 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 8 |  | 8 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 7,789 |  | 7,789 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 4,696 |  | 4,696 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 2,496 |  | 2,496 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 484 |  | 484 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 5,348 |  | 5,348 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 505 |  | 505 |
Financing Receivable, Excluding Accrued Interest, Revolving | 5,215 |  | 5,215 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 3,041 |  | 3,041 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 165 |  | 165 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 682 |  | 682 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 1,774 |  | 1,774 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 101 |  | 101 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 452 |  | 452 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 61 |  | 61 |
Financing Receivable, Excluding Accrued Interest, Revolving | 2,752 |  | 2,752 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 2,512 |  | 2,512 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 52 |  | 52 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 4,636 |  | 4,636 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 3 |  | 3 |
Financing Receivable, Excluding Accrued Interest, Revolving | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 57 |  | 57 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 261 |  | 261 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 110 |  | 110 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 259 |  | 259 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 428 |  | 428 |
Financing Receivable, Excluding Accrued Interest, Revolving | 1,135 |  | 1,135 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | 0 |  | 0 |
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year | 7,624 |  | 7,624 |
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3,957 |  | 3,957 |
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year | 461 |  | 461 |
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year | 221 |  | 221 |
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year | 1 |  | 1 |
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year | 13 |  | 13 |
Financing Receivable, Excluding Accrued Interest, Revolving | 1,328 |  | 1,328 |
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan | $ 529 |  | $ 529 |

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