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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, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 233,619   $ 227,621      
Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 75,166 $ 78,465 104,237 $ 87,270 $ 87,026 $ 72,091
Commercial and Industrial Total Energy Loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 14,929 19,191 18,062 16,267 15,422 17,217
Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 120,926 115,693 90,301 117,106 128,954 144,936
Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 13,035 9,708 8,004 6,854 6,359 6,585
Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 9,563 8,457 7,017 12,135 9,074 7,837
Loans Receivable [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 233,619 $ 231,514 227,621 $ 239,632 $ 246,835 $ 248,666
Modeled Expected Credit Losses [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 85,769   110,292      
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 46,435   61,918      
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 5,733   8,531      
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 15,496   27,013      
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 12,594   7,847      
Modeled Expected Credit Losses [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 5,511   4,983      
Q-factor adjustments [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 141,389   105,148      
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 26,270   36,237      
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 6,496   5,148      
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 104,130   61,572      
Q-factor adjustments [Member] | Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 441   157      
Q-factor adjustments [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 4,052   2,034      
Specific Valuation Allowances [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 6,461   12,181      
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 2,461   6,082      
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 2,700   4,383      
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 1,300   1,716      
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 0   0      
Specific Valuation Allowances [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 0   $ 0