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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, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 239,632 |  | $ 248,666 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 87,270 | $ 87,026 | 72,091 | $ 65,271 | $ 70,892 | $ 73,843
Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 16,267 | 15,422 | 17,217 | 28,010 | 33,472 | 39,553
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 117,106 | 128,954 | 144,936 | 147,993 | 144,440 | 134,892
Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 6,854 | 6,359 | 6,585 | 6,154 | 5,636 | 7,926
Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 12,135 | 9,074 | 7,837 | 7,860 | 6,818 | 6,963
Loans Receivable [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 239,632 | $ 246,835 | 248,666 | $ 255,288 | $ 261,258 | $ 263,177
Modeled Expected Credit Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 91,223 |  | 82,866 |  |  |
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 48,776 |  | 46,946 |  |  |
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 | 6,106 |  | 6,363 |  |  |
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 | 20,093 |  | 16,676 |  |  |
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 | 6,639 |  | 6,484 |  |  |
Modeled Expected Credit Losses [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 9,609 |  | 6,397 |  |  |
Q-factor adjustments [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 137,314 |  | 149,348 |  |  |
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 35,134 |  | 14,609 |  |  |
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 | 3,989 |  | 5,374 |  |  |
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 95,532 |  | 127,860 |  |  |
Q-factor adjustments [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 133 |  | 65 |  |  |
Q-factor adjustments [Member] | Consumer Loan [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 2,526 |  | 1,440 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 11,095 |  | 16,452 |  |  |
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 3,360 |  | 10,536 |  |  |
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 | 6,172 |  | 5,480 |  |  |
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 1,481 |  | 400 |  |  |
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 82 |  | 36 |  |  |
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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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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