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Loans (Allowance for Credit Losses By Loan Class in Accordance With Methodology Used Prior to CECL) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   $ 132,167
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   51,593
Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   37,382
Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   31,037
Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   4,113
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   8,042
Historical Valuation Allowances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   69,087
Historical Valuation Allowances [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   29,015
Historical Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   7,873
Historical Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   21,947
Historical Valuation Allowances [Member] | Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   2,690
Historical Valuation Allowances [Member] | Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   7,562
Specific Valuation Allowances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses $ 15,279 28,483
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses 5,321 7,849
Specific Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses 9,427 20,246
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   383
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses 0 0
Specific Valuation Allowances [Member] | Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses $ 18 5
General Valuation Allowances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   19,732
General Valuation Allowances [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   9,840
General Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   5,196
General Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   4,201
General Valuation Allowances [Member] | Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   904
General Valuation Allowances [Member] | Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   (409)
Macroeconomic Valuation Allowances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   14,865
Macroeconomic Valuation Allowances [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   4,889
Macroeconomic Valuation Allowances [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   4,067
Macroeconomic Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   4,506
Macroeconomic Valuation Allowances [Member] | Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   519
Macroeconomic Valuation Allowances [Member] | Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portion of allowance for loan losses   $ 884