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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 1,391,552 |  | $ 1,391,552 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 877,000 |  | 877,000 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 528,835 |  | 528,835 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 396,428 |  | 396,428 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 193,707 |  | 193,707 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 234,603 |  | 234,603 |
Financing Receivable, Revolving | 2,152,870 |  | 2,152,870 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 943 | $ 572 | 14,259 | $ 5,918
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 331,902 |  | 331,902 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 72,578 |  | 72,578 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 79,911 |  | 79,911 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 4,162 |  | 4,162 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 7,237 |  | 7,237 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 4,874 |  | 4,874 |
Financing Receivable, Revolving | 497,025 |  | 497,025 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 | 518 | 371
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 | 1,217,271 |  | 1,217,271 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,776,671 |  | 1,776,671 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,414,317 |  | 1,414,317 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 871,262 |  | 871,262 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 568,451 |  | 568,451 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,012,988 |  | 1,012,988 |
Financing Receivable, Revolving | 228,252 |  | 228,252 |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 62 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 419,819 |  | 419,819 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 555,411 |  | 555,411 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 369,185 |  | 369,185 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 47,871 |  | 47,871 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 305 |  | 305 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,638 |  | 1,638 |
Financing Receivable, Revolving | 150,437 |  | 150,437 |
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 | 170 | 68 | 1,500 | 430
Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 8,189 | 6,549 | 22,147 | 17,642
Loans Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 9,364 | $ 7,189 | 38,486 | $ 25,063
Nonperforming Financial Instruments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 26,586 |  | 26,586 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 464 |  | 464 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 380 |  | 380 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 841 |  | 841 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 7,958 |  | 7,958 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,971 |  | 3,971 |
Financing Receivable, Revolving | 26,426 |  | 26,426 |
Financing Receivable, Revolving, Converted to Term Loan | 549 |  | 549 |
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 | 359 |  | 359 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 84 |  | 84 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 747 |  | 747 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,812 |  | 2,812 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,068 |  | 1,068 |
Financing Receivable, Revolving | 21,924 |  | 21,924 |
Financing Receivable, Revolving, Converted to Term Loan | 332 |  | 332 |
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 | 8,148 |  | 8,148 |
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 | 56 |  | 56 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,348 |  | 1,348 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Revolving | 4,502 |  | 4,502 |
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 | 18,438 |  | 18,438 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 105 |  | 105 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 296 |  | 296 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,463 |  | 1,463 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2,810 |  | 2,810 |
Financing Receivable, Revolving | 0 |  | 0 |
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 | 38 |  | 38 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,335 |  | 2,335 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 93 |  | 93 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 71 |  | 71 |
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 | 15,667 |  | 15,667 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 5,341 |  | 5,341 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 518 |  | 518 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 66 |  | 66 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 26 |  | 26 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 244 |  | 244 |
Financing Receivable, Revolving | 10,376 |  | 10,376 |
Financing Receivable, Revolving, Converted to Term Loan | 6,248 |  | 6,248 |
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 | 124 |  | 124 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 952 |  | 952 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 178 |  | 178 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 54 |  | 54 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 25 |  | 25 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 29 |  | 29 |
Financing Receivable, Revolving | 7,594 |  | 7,594 |
Financing Receivable, Revolving, Converted to Term Loan | 5,303 |  | 5,303 |
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 | 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 | 518 |  | 518 |
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 | 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 | 62 |  | 62 |
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 | 280 |  | 280 |
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 | 130 |  | 130 |
Financing Receivable, Revolving | 1,090 |  | 1,090 |
Financing Receivable, 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, Year One, Originated, Current Fiscal Year | 15,543 |  | 15,543 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 4,389 |  | 4,389 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 60 |  | 60 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 12 |  | 12 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1 |  | 1 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 23 |  | 23 |
Financing Receivable, Revolving | 1,692 |  | 1,692 |
Financing Receivable, Revolving, Converted to Term Loan | $ 427 |  | $ 427 |

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