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Loans Loans - Allowance for Credit Loss By Loan Class Calculated in Accordance With CECL Methodology (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 256,307 |  | $ 245,996 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 78,554 | $ 75,596 | 74,006 | $ 75,166 | $ 78,465 | $ 104,237
Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 11,485 | 14,218 | 17,814 | 14,929 | 19,191 | 18,062
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 140,020 | 138,224 | 130,598 | 120,926 | 115,693 | 90,301
Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 15,707 | 13,857 | 13,538 | 13,035 | 9,708 | 8,004
Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 10,541 | 8,402 | 10,040 | 9,563 | 8,457 | 7,017
Loans Receivable [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 256,307 | $ 250,297 | 245,996 | $ 233,619 | $ 231,514 | $ 227,621
Modeled Expected Credit Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 103,662 |  | 92,573 |  |  |
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 56,937 |  | 50,959 |  |  |
Modeled Expected Credit Losses [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 3,841 |  | 7,838 |  |  |
Modeled Expected Credit Losses [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 20,961 |  | 15,443 |  |  |
Modeled Expected Credit Losses [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 14,508 |  | 12,364 |  |  |
Modeled Expected Credit Losses [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 7,415 |  | 5,969 |  |  |
Q-factor adjustments [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 138,610 |  | 144,897 |  |  |
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 15,589 |  | 20,612 |  |  |
Q-factor adjustments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4,944 |  | 7,276 |  |  |
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 114,443 |  | 112,505 |  |  |
Q-factor adjustments [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 508 |  | 433 |  |  |
Q-factor adjustments [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 3,126 |  | 4,071 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 14,035 |  | 8,526 |  |  |
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 6,028 |  | 2,435 |  |  |
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 2,700 |  | 2,700 |  |  |
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4,616 |  | 2,650 |  |  |
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 691 |  | 741 |  |  |
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 0 |  | $ 0 |  |  |

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