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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 1,208,188 |  | $ 1,208,188 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 719,078 |  | 719,078 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 667,895 |  | 667,895 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 391,455 |  | 391,455 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 321,844 |  | 321,844 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 342,978 |  | 342,978 |
Financing Receivable, Revolving | 2,486,421 |  | 2,486,421 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 4,282 | $ 7,136 | 6,426 | $ 13,316
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 304,570 |  | 304,570 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 36,014 |  | 36,014 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 55,059 |  | 55,059 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 50,104 |  | 50,104 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 4,055 |  | 4,055 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 10,415 |  | 10,415 |
Financing Receivable, Revolving | 628,754 |  | 628,754 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 79 | 518 | 79 | 518
Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 690,654 |  | 690,654 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,490,259 |  | 1,490,259 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,708,392 |  | 1,708,392 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,234,202 |  | 1,234,202 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 751,974 |  | 751,974 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,296,706 |  | 1,296,706 |
Financing Receivable, Revolving | 167,257 |  | 167,257 |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 122 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 351,397 |  | 351,397 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 516,044 |  | 516,044 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 647,171 |  | 647,171 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 298,063 |  | 298,063 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 28,003 |  | 28,003 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,296 |  | 1,296 |
Financing Receivable, Revolving | 155,406 |  | 155,406 |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 0 |
Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 408 | 1,080 | 2,077 | 1,330
Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 8,360 | 7,016 | 16,617 | 13,958
Loans Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 13,251 | $ 15,750 | 25,321 | $ 29,122
Nonperforming Financial Instruments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 5,596 |  | 5,596 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 23,879 |  | 23,879 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 4,186 |  | 4,186 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 8,440 |  | 8,440 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 570 |  | 570 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 11,348 |  | 11,348 |
Financing Receivable, Revolving | 8,088 |  | 8,088 |
Financing Receivable, Revolving, Converted to Term Loan | 12,880 |  | 12,880 |
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 746 |  | 746 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3,764 |  | 3,764 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,159 |  | 1,159 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,066 |  | 3,066 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 514 |  | 514 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,197 |  | 2,197 |
Financing Receivable, Revolving | 2,149 |  | 2,149 |
Financing Receivable, Revolving, Converted to Term Loan | 12,734 |  | 12,734 |
Nonperforming Financial Instruments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 4,522 |  | 4,522 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 56 |  | 56 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,321 |  | 1,321 |
Financing Receivable, Revolving | 3,102 |  | 3,102 |
Financing Receivable, Revolving, Converted to Term Loan | 146 |  | 146 |
Nonperforming Financial Instruments [Member] | Commercial Real Estate Buildings Land And Other Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 328 |  | 328 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 20,115 |  | 20,115 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 3,027 |  | 3,027 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 5,374 |  | 5,374 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,411 |  | 1,411 |
Financing Receivable, Revolving | 2,837 |  | 2,837 |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  | 0 |
Nonperforming Financial Instruments [Member] | Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 6,419 |  | 6,419 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 0 |  | 0 |
Nonperforming Financial Instruments [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 9,369 |  | 9,369 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 6,263 |  | 6,263 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,077 |  | 1,077 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 724 |  | 724 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 405 |  | 405 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,060 |  | 1,060 |
Financing Receivable, Revolving | 5,459 |  | 5,459 |
Financing Receivable, Revolving, Converted to Term Loan | 964 |  | 964 |
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, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 471 |  | 471 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 676 |  | 676 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 467 |  | 467 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 401 |  | 401 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 625 |  | 625 |
Financing Receivable, Revolving | 2,902 |  | 2,902 |
Financing Receivable, Revolving, Converted to Term Loan | 884 |  | 884 |
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, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 79 |  | 79 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 122 |  | 122 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 148 |  | 148 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 253 |  | 253 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 384 |  | 384 |
Financing Receivable, Revolving | 1,225 |  | 1,225 |
Financing Receivable, Revolving, Converted to Term Loan | 67 |  | 67 |
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, Year One, Originated, Current Fiscal Year | 9,369 |  | 9,369 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 5,713 |  | 5,713 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 131 |  | 131 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 4 |  | 4 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 4 |  | 4 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 51 |  | 51 |
Financing Receivable, Revolving | 1,332 |  | 1,332 |
Financing Receivable, Revolving, Converted to Term Loan | $ 13 |  | $ 13 |

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