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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, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 263,129   $ 245,996      
Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 80,576 $ 78,554 74,006 $ 74,307 $ 75,166 $ 104,237
Commercial and Industrial Total Energy Loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 12,121 11,485 17,814 17,066 14,929 18,062
Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 142,825 140,020 130,598 126,492 120,926 90,301
Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 17,652 15,707 13,538 15,039 13,035 8,004
Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 9,955 10,541 10,040 9,331 9,563 7,017
Loans Receivable [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 263,129 $ 256,307 245,996 $ 242,235 $ 233,619 $ 227,621
Modeled Expected Credit Losses [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 94,857   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 49,113   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 3,653   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 19,148   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 16,247   12,364      
Modeled Expected Credit Losses [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 6,696   5,969      
Q-factor adjustments [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 144,373   144,897      
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 16,062   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 5,768   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 118,902   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 569   433      
Q-factor adjustments [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 3,072   4,071      
Specific Valuation Allowances [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 23,899   8,526      
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 15,401   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 4,775   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 836   741      
Specific Valuation Allowances [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 187   $ 0