Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 121,797	$ 134,059
Financing Receivable, Nonaccrual, No Allowance	90,854	114,025
Financing receivable, Nonaccrual, With Allowance	30,943	20,034
Financing Receivable, Nonaccrual, Related Allowance	5,570	6,343
Commercial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	60,297	74,104
Financing Receivable, Nonaccrual, No Allowance	45,531	62,146
Financing receivable, Nonaccrual, With Allowance	14,766	11,958
Financing Receivable, Nonaccrual, Related Allowance	4,020	3,994
Commercial [Member] | Healthcare [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	41,034	15,762
Financing Receivable, Nonaccrual, No Allowance	34,661	9,679
Financing receivable, Nonaccrual, With Allowance	6,373	6,083
Financing Receivable, Nonaccrual, Related Allowance	946	53
Commercial [Member] | Services [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	16,228	17,170
Financing Receivable, Nonaccrual, No Allowance	7,835	13,686
Financing receivable, Nonaccrual, With Allowance	8,393	3,484
Financing Receivable, Nonaccrual, Related Allowance	3,074	2,584
Commercial [Member] | Energy [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	1,399	31,091
Financing Receivable, Nonaccrual, No Allowance	1,399	31,091
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Commercial [Member] | General business [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	1,636	10,081
Financing Receivable, Nonaccrual, No Allowance	1,636	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	16,570	14,262
Financing Receivable, Nonaccrual, No Allowance	393	6,186
Financing receivable, Nonaccrual, With Allowance	16,177	8,076
Financing Receivable, Nonaccrual, Related Allowance	1,550	2,349
Loans to individuals [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	44,930	45,693
Financing Receivable, Nonaccrual, No Allowance	44,930	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	29,791	31,574
Financing Receivable, Nonaccrual, No Allowance	29,791	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	134	258
Financing Receivable, Nonaccrual, No Allowance	134	258
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
US Government Agency Insured Loans | Loans to individuals [Member] | Residential mortgage [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	15,005	13,861
Financing Receivable, Nonaccrual, No Allowance	15,005	13,861
Financing receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	$ 0	$ 0