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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 1,145,305 |  | $ 1,145,305 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 941,744 |  | 941,744 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 561,695 |  | 561,695 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 420,405 |  | 420,405 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 211,653 |  | 211,653 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 258,011 |  | 258,011 |
Financing Receivable, Revolving | 2,122,788 |  | 2,122,788 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 7,136 | $ 1,891 | 13,316 | $ 5,346
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 311,743 |  | 311,743 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 70,287 |  | 70,287 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 83,419 |  | 83,419 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 4,469 |  | 4,469 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 7,643 |  | 7,643 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 6,089 |  | 6,089 |
Financing Receivable, Revolving | 466,945 |  | 466,945 |
Financing Receivable, Allowance for Credit Loss, Writeoff | 518 | 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 | 718,176 |  | 718,176 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,786,515 |  | 1,786,515 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 1,488,642 |  | 1,488,642 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 923,237 |  | 923,237 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 644,069 |  | 644,069 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,101,800 |  | 1,101,800 |
Financing Receivable, Revolving | 155,033 |  | 155,033 |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 0 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 299,297 |  | 299,297 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 570,101 |  | 570,101 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 352,871 |  | 352,871 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 51,647 |  | 51,647 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 945 |  | 945 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,666 |  | 1,666 |
Financing Receivable, Revolving | 191,544 |  | 191,544 |
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 | 1,080 | 131 | 1,330 | 362
Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 7,016 | 5,322 | 13,958 | 11,093
Loans Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | 15,750 | $ 7,344 | 29,122 | $ 17,874
Nonperforming Financial Instruments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 12,248 |  | 12,248 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 8 |  | 8 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 517 |  | 517 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 19,180 |  | 19,180 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 8,259 |  | 8,259 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 4,912 |  | 4,912 |
Financing Receivable, Revolving | 21,578 |  | 21,578 |
Financing Receivable, Revolving, Converted to Term Loan | 1,079 |  | 1,079 |
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 | 0 |  | 0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 221 |  | 221 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 754 |  | 754 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,957 |  | 2,957 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,172 |  | 1,172 |
Financing Receivable, Revolving | 16,746 |  | 16,746 |
Financing Receivable, Revolving, Converted to Term Loan | 367 |  | 367 |
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 | 10,324 |  | 10,324 |
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 | 59 |  | 59 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,349 |  | 1,349 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 2 |  | 2 |
Financing Receivable, Revolving | 4,832 |  | 4,832 |
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 | 1,924 |  | 1,924 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 8 |  | 8 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 296 |  | 296 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 18,328 |  | 18,328 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 1,483 |  | 1,483 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 3,643 |  | 3,643 |
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 | 39 |  | 39 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 2,470 |  | 2,470 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 95 |  | 95 |
Financing Receivable, Revolving | 0 |  | 0 |
Financing Receivable, Revolving, Converted to Term Loan | 566 |  | 566 |
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 | 8,267 |  | 8,267 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 4,562 |  | 4,562 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 515 |  | 515 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 67 |  | 67 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 25 |  | 25 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 141 |  | 141 |
Financing Receivable, Revolving | 9,439 |  | 9,439 |
Financing Receivable, Revolving, Converted to Term Loan | 6,106 |  | 6,106 |
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 | 208 |  | 208 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 178 |  | 178 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 55 |  | 55 |
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 | 7,427 |  | 7,427 |
Financing Receivable, Revolving, Converted to Term Loan | 5,270 |  | 5,270 |
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 | 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 | 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 | 89 |  | 89 |
Financing Receivable, Revolving | 961 |  | 961 |
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 | 8,143 |  | 8,143 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 4,354 |  | 4,354 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 57 |  | 57 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 12 |  | 12 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  | 0 |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 23 |  | 23 |
Financing Receivable, Revolving | 1,051 |  | 1,051 |
Financing Receivable, Revolving, Converted to Term Loan | $ 318 |  | $ 318 |

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