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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, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 256,307   $ 245,996      
Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 78,554 $ 75,596 74,006 $ 75,166 $ 78,465 $ 104,237
Commercial and Industrial Total Energy Loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 11,485 14,218 17,814 14,929 19,191 18,062
Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 140,020 138,224 130,598 120,926 115,693 90,301
Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 15,707 13,857 13,538 13,035 9,708 8,004
Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 10,541 8,402 10,040 9,563 8,457 7,017
Loans Receivable [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 256,307 $ 250,297 245,996 $ 233,619 $ 231,514 $ 227,621
Modeled Expected Credit Losses [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 103,662   92,573      
Modeled Expected Credit Losses [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 56,937   50,959      
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 3,841   7,838      
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 20,961   15,443      
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 14,508   12,364      
Modeled Expected Credit Losses [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 7,415   5,969      
Q-factor adjustments [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 138,610   144,897      
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 15,589   20,612      
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 4,944   7,276      
Q-factor adjustments [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 114,443   112,505      
Q-factor adjustments [Member] | Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 508   433      
Q-factor adjustments [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 3,126   4,071      
Specific Valuation Allowances [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 14,035   8,526      
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 6,028   2,435      
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   2,700      
Specific Valuation Allowances [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 4,616   2,650      
Specific Valuation Allowances [Member] | Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 691   741      
Specific Valuation Allowances [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 0   $ 0