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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, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | $ 250,061 | $ 132,167
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 98,536 | 51,593
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 40,817 | 37,382
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 93,425 | 31,037
Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 8,998 | 4,113
Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 8,285 | 8,042
Modeled Expected Credit Losses [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 243,060 |
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 86,016 |
Modeled Expected Credit Losses [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 17,977 |
Modeled Expected Credit Losses [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 121,978 |
Modeled Expected Credit Losses [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 8,865 |
Modeled Expected Credit Losses [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 8,224 |
Q-factor adjustments [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | (8,671) |
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 430 |
Q-factor adjustments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 20,590 |
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | (29,867) |
Q-factor adjustments [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 133 |
Q-factor adjustments [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 43 |
Specific Valuation Allowances [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 15,672 | 28,483
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 12,090 | 7,849
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 2,250 | 20,246
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 1,314 | 383
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 0 | 0
Specific Valuation Allowances [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | $ 18 | $ 5

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