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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, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance |  | $ 132,167
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance |  | 51,593
Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance |  | 37,382
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance |  | 31,037
Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance |  | 4,113
Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance |  | 8,042
Modeled Expected Credit Losses [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | $ 234,151 |
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 68,896 |
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 | 21,644 |
Modeled Expected Credit Losses [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 125,965 |
Modeled Expected Credit Losses [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 10,226 |
Modeled Expected Credit Losses [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 7,420 |
Q-factor adjustments [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 14,380 |
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | (1,647) |
Q-factor adjustments [Member] | Commercial and Industrial Total Energy Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 24,630 |
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | (8,685) |
Q-factor adjustments [Member] | Total consumer real estate loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 51 |
Q-factor adjustments [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 31 |
Specific Valuation Allowances [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 14,944 | 28,483
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans and Leases Receivable, Allowance | 5,256 | 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 | 8,357 | 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 | 1,313 | 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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