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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, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 242,235   $ 227,621      
Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 74,307 $ 75,166 104,237 $ 98,830 $ 87,270 $ 72,091
Commercial and Industrial Total Energy Loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 17,066 14,929 18,062 18,851 16,267 17,217
Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 126,492 120,926 90,301 100,607 117,106 144,936
Total consumer real estate loans [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 15,039 13,035 8,004 8,035 6,854 6,585
Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 9,331 9,563 7,017 7,992 12,135 7,837
Loans Receivable [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 242,235 $ 233,619 227,621 $ 234,315 $ 239,632 $ 248,666
Modeled Expected Credit Losses [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 88,326   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 45,398   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 7,065   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 16,366   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 14,239   7,847      
Modeled Expected Credit Losses [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 5,258   4,983      
Q-factor adjustments [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 144,099   105,148      
Q-factor adjustments [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 23,547   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 7,301   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 108,680   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 498   157      
Q-factor adjustments [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 4,073   2,034      
Specific Valuation Allowances [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 9,810   12,181      
Specific Valuation Allowances [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss 5,362   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 1,446   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 302   0      
Specific Valuation Allowances [Member] | Consumer Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 0   $ 0