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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 119,585	$ 121,797
Financing Receivable, Nonaccrual, No Allowance	117,102	90,854
Financing Receivable, Nonaccrual, With Allowance	2,483	30,943
Financing Receivable, Nonaccrual, Related Allowance	1,646	5,570
Commercial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	70,698	60,297
Financing Receivable, Nonaccrual, No Allowance	68,215	45,531
Financing Receivable, Nonaccrual, With Allowance	2,483	14,766
Financing Receivable, Nonaccrual, Related Allowance	1,646	4,020
Commercial [Member] | Energy [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	19,559	1,399
Financing Receivable, Nonaccrual, No Allowance	19,559	1,399
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Commercial [Member] | Healthcare [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	41,836	41,034
Financing Receivable, Nonaccrual, No Allowance	41,836	34,661
Financing Receivable, Nonaccrual, With Allowance	0	6,373
Financing Receivable, Nonaccrual, Related Allowance	0	946
Commercial [Member] | Services [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	2,820	16,228
Financing Receivable, Nonaccrual, No Allowance	337	7,835
Financing Receivable, Nonaccrual, With Allowance	2,483	8,393
Financing Receivable, Nonaccrual, Related Allowance	1,646	3,074
Commercial [Member] | General business [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	6,483	1,636
Financing Receivable, Nonaccrual, No Allowance	6,483	1,636
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	0	0
Commercial real estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	7,418	16,570
Financing Receivable, Nonaccrual, No Allowance	7,418	393
Financing Receivable, Nonaccrual, With Allowance	0	16,177
Financing Receivable, Nonaccrual, Related Allowance	0	1,550
Loans to individuals [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	41,469	44,930
Financing Receivable, Nonaccrual, No Allowance	41,469	44,930
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	30,954	29,791
Financing Receivable, Nonaccrual, No Allowance	30,954	29,791
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	79	134
Financing Receivable, Nonaccrual, No Allowance	79	134
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	10,436	15,005
Financing Receivable, Nonaccrual, No Allowance	10,436	15,005
Financing Receivable, Nonaccrual, With Allowance	0	0
Financing Receivable, Nonaccrual, Related Allowance	$ 0	$ 0

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+ References

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- Definition

Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
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