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Loans - Financing Receivable, Gross Charge-Offs By Year of Origination (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 1,213,266 |  | $ 1,213,266 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 645,575 |  | 645,575 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 596,772 |  | 596,772 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 335,508 |  | 335,508 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 303,937 |  | 303,937 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 318,214 |  | 318,214 |
Financing Receivable, Revolving | 2,342,671 |  | 2,342,671 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 3,907 | $ 943 | 10,333 | $ 14,259
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 329,675 |  | 329,675 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 26,287 |  | 26,287 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 52,657 |  | 52,657 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 45,169 |  | 45,169 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 3,488 |  | 3,488 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 9,365 |  | 9,365 |
Financing Receivable, Revolving | 596,664 |  | 596,664 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 | 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 | 1,028,255 |  | 1,028,255 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,458,787 |  | 1,458,787 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,637,773 |  | 1,637,773 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 1,174,145 |  | 1,174,145 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 724,347 |  | 724,347 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,161,426 |  | 1,161,426 |
Financing Receivable, Revolving | 133,265 |  | 133,265 |
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 | 573,431 |  | 573,431 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 578,682 |  | 578,682 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 605,020 |  | 605,020 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 279,883 |  | 279,883 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 27,978 |  | 27,978 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 711 |  | 711 |
Financing Receivable, Revolving | 239,389 |  | 239,389 |
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 | 2,013 | 170 | 4,090 | 1,500
Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 8,007 | 8,189 | 24,624 | 22,147
Loans Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 13,927 | $ 9,364 | 39,248 | $ 38,486
Nonperforming Financial Instruments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 27,170 |  | 27,170 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 22,063 |  | 22,063 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 15,246 |  | 15,246 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 5,330 |  | 5,330 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,834 |  | 1,834 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 7,344 |  | 7,344 |
Financing Receivable, Revolving | 6,643 |  | 6,643 |
Financing Receivable, Revolving, Converted to Term Loan | 19,247 |  | 19,247 |
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 22,756 |  | 22,756 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 2,822 |  | 2,822 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 4,335 |  | 4,335 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 2,088 |  | 2,088 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 494 |  | 494 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,171 |  | 2,171 |
Financing Receivable, Revolving | 730 |  | 730 |
Financing Receivable, Revolving, Converted to Term Loan | 15,663 |  | 15,663 |
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 | 4,086 |  | 4,086 |
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 | 2,702 |  | 2,702 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 328 |  | 328 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 18,867 |  | 18,867 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 10,911 |  | 10,911 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 3,242 |  | 3,242 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,248 |  | 1,248 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,594 |  | 1,594 |
Financing Receivable, Revolving | 2,718 |  | 2,718 |
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 | 36 |  | 36 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,258 |  | 2,258 |
Financing Receivable, Revolving | 493 |  | 493 |
Financing Receivable, Revolving, Converted to Term Loan | 3,584 |  | 3,584 |
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 | 374 |  | 374 |
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 | 16,551 |  | 16,551 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 7,995 |  | 7,995 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,381 |  | 1,381 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 793 |  | 793 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 429 |  | 429 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,244 |  | 1,244 |
Financing Receivable, Revolving | 9,691 |  | 9,691 |
Financing Receivable, Revolving, Converted to Term Loan | 1,164 |  | 1,164 |
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 | 5 |  | 5 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,741 |  | 1,741 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 755 |  | 755 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 487 |  | 487 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 402 |  | 402 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 625 |  | 625 |
Financing Receivable, Revolving | 5,252 |  | 5,252 |
Financing Receivable, Revolving, Converted to Term Loan | 1,066 |  | 1,066 |
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 | 407 |  | 407 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 315 |  | 315 |
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 | 558 |  | 558 |
Financing Receivable, Revolving | 2,490 |  | 2,490 |
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 | 16,546 |  | 16,546 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 5,768 |  | 5,768 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 189 |  | 189 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 53 |  | 53 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 27 |  | 27 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 61 |  | 61 |
Financing Receivable, Revolving | 1,949 |  | 1,949 |
Financing Receivable, Revolving, Converted to Term Loan | $ 31 |  | $ 31 |

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