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Loans Loans - Allowance for Credit Loss By Loan Class Calculated in Accordance With CECL Methodology (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 242,235 |  | $ 227,621 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 74,307 | $ 75,166 | 104,237 | $ 98,830 | $ 87,270 | $ 72,091
Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 17,066 | 14,929 | 18,062 | 18,851 | 16,267 | 17,217
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 126,492 | 120,926 | 90,301 | 100,607 | 117,106 | 144,936
Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 15,039 | 13,035 | 8,004 | 8,035 | 6,854 | 6,585
Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 9,331 | 9,563 | 7,017 | 7,992 | 12,135 | 7,837
Loans Receivable [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 242,235 | $ 233,619 | 227,621 | $ 234,315 | $ 239,632 | $ 248,666
Modeled Expected Credit Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 88,326 |  | 110,292 |  |  |
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 45,398 |  | 61,918 |  |  |
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 | 7,065 |  | 8,531 |  |  |
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 | 16,366 |  | 27,013 |  |  |
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 | 14,239 |  | 7,847 |  |  |
Modeled Expected Credit Losses [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 5,258 |  | 4,983 |  |  |
Q-factor adjustments [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 144,099 |  | 105,148 |  |  |
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 23,547 |  | 36,237 |  |  |
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 | 7,301 |  | 5,148 |  |  |
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 108,680 |  | 61,572 |  |  |
Q-factor adjustments [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 498 |  | 157 |  |  |
Q-factor adjustments [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4,073 |  | 2,034 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 9,810 |  | 12,181 |  |  |
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 5,362 |  | 6,082 |  |  |
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 |  | 4,383 |  |  |
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 1,446 |  | 1,716 |  |  |
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 302 |  | 0 |  |  |
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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