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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual $ 124,246 $ 134,059
Financing Receivable, Nonaccrual, No Allowance 106,551 114,025
Financing Receivable, Nonaccrual, With Allowance 17,695 20,034
Financing Receivable, Nonaccrual, Related Allowance 3,288 6,343
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 60,337 74,104
Financing Receivable, Nonaccrual, No Allowance 50,550 62,146
Financing Receivable, Nonaccrual, With Allowance 9,787 11,958
Financing Receivable, Nonaccrual, Related Allowance 2,353 3,994
Commercial [Member] | Energy [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 24,976 31,091
Financing Receivable, Nonaccrual, No Allowance 24,976 31,091
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 15,076 15,762
Financing Receivable, Nonaccrual, No Allowance 8,534 9,679
Financing Receivable, Nonaccrual, With Allowance 6,542 6,083
Financing Receivable, Nonaccrual, Related Allowance 946 53
Commercial [Member] | Services [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 16,535 17,170
Financing Receivable, Nonaccrual, No Allowance 13,290 13,686
Financing Receivable, Nonaccrual, With Allowance 3,245 3,484
Financing Receivable, Nonaccrual, Related Allowance 1,407 2,584
Commercial [Member] | General business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 3,750 10,081
Financing Receivable, Nonaccrual, No Allowance 3,750 7,690
Financing Receivable, Nonaccrual, With Allowance 0 2,391
Financing Receivable, Nonaccrual, Related Allowance 0 1,357
Commercial real estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 15,989 14,262
Financing Receivable, Nonaccrual, No Allowance 8,081 6,186
Financing Receivable, Nonaccrual, With Allowance 7,908 8,076
Financing Receivable, Nonaccrual, Related Allowance 935 2,349
Loans to individuals [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 47,920 45,693
Financing Receivable, Nonaccrual, No Allowance 47,920 45,693
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 30,757 31,574
Financing Receivable, Nonaccrual, No Allowance 30,757 31,574
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 171 258
Financing Receivable, Nonaccrual, No Allowance 171 258
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
US Government Agency Insured Loans [Member] | Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 16,992 13,861
Financing Receivable, Nonaccrual, No Allowance 16,992 13,861
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance $ 0 $ 0