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Loans (Allowance for Credit Loss By Loan Class Calculated in Accordance With CECL Methodology) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 248,666 | $ 263,177 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 72,091 | 73,843 | $ 51,593 | $ 48,580
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 17,217 | 39,553 | 37,382 | 29,052
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 144,936 | 134,892 | 31,037 | 38,777
Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 6,585 | 7,926 | 4,113 | 6,103
Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 7,837 | 6,963 | 8,042 | 9,620
Loans Receivable [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 248,666 | 263,177 | $ 132,167 | $ 132,132
Modeled Expected Credit Losses [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 82,866 | 214,552 |  |
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 46,946 | 65,645 |  |
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 | 6,363 | 8,910 |  |
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 | 16,676 | 125,126 |  |
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 | 6,484 | 7,926 |  |
Modeled Expected Credit Losses [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 6,397 | 6,945 |  |
Q-factor adjustments [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 149,348 | 33,346 |  |
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 14,609 | 2,877 |  |
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 | 5,374 | 21,216 |  |
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 127,860 | 9,253 |  |
Q-factor adjustments [Member] | Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 65 | 0 |  |
Q-factor adjustments [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 1,440 | 0 |  |
Specific Valuation Allowances [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 16,452 | 15,279 |  |
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 10,536 | 5,321 |  |
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 | 5,480 | 9,427 |  |
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 400 | 513 |  |
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 36 | 0 |  |
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 0 | $ 18 |  |

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