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Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans and Leases	$ 37,680,901	$ 37,441,951
Non-Accrual	96,478	74,371
Loans Insured or Guaranteed by US Government Authorities [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	41,500	19,300
Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	57,895	40,014
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	47,304	45,221
90 Days or More and Accruing (2)
Financing Receivable, Past Due [Line Items]
Loans and Leases	72,782	39,542
90 Days or More and Accruing (2) | Loans Insured or Guaranteed by US Government Authorities [Member]
Financing Receivable, Past Due [Line Items]
Loans and Leases	32,100	12,300
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	177,981	124,777
Current and Other
Financing Receivable, Past Due [Line Items]
Loans and Leases	37,406,442	37,242,803
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and Leases	19,567,672	19,454,480
Commercial real estate | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	6,278,154	6,482,940
Non-Accrual	14,577	4,359
Commercial real estate | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,270,294	5,195,605
Non-Accrual	24,755	24,330
Commercial real estate | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,804,364	5,704,734
Non-Accrual	0	0
Commercial real estate | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,983,213	1,747,302
Non-Accrual	0	0
Commercial real estate | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	231,647	323,899
Non-Accrual	0	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	27,954	1,270
Commercial real estate | Greater than 30 to 59 Days Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,411	3,078
Commercial real estate | Greater than 30 to 59 Days Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	3,312
Commercial real estate | 60 to 89 Days Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	169	2,191
Commercial real estate | 60 to 89 Days Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | 90 Days or More and Accruing (2) | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	437
Commercial real estate | 90 Days or More and Accruing (2) | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	433
Commercial real estate | 90 Days or More and Accruing (2) | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | 90 Days or More and Accruing (2) | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | 90 Days or More and Accruing (2) | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | Total Past Due | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	27,954	5,019
Commercial real estate | Total Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,580	5,702
Commercial real estate | Total Past Due | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | Total Past Due | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | Total Past Due | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial real estate | Current and Other | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	6,235,623	6,473,562
Commercial real estate | Current and Other | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,243,959	5,165,573
Commercial real estate | Current and Other | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,804,364	5,704,734
Commercial real estate | Current and Other | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,983,213	1,747,302
Commercial real estate | Current and Other | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	231,647	323,899
Commercial
Financing Receivable, Past Due [Line Items]
Loans and Leases	9,968,096	9,696,404
Commercial | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,537,618	5,536,765
Non-Accrual	29,483	14,519
Commercial | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,769,643	2,430,127
Non-Accrual	6,666	2,760
Commercial | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,660,835	1,729,512
Non-Accrual	20,997	28,403
Commercial | Greater than 30 to 59 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,711	6,341
Commercial | Greater than 30 to 59 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,345	1,647
Commercial | Greater than 30 to 59 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	15,318	22,217
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	893	2,101
Commercial | 60 to 89 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,523	1,137
Commercial | 60 to 89 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	17,117	24,178
Commercial | 90 Days or More and Accruing (2) | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	202
Commercial | 90 Days or More and Accruing (2) | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	206	66
Commercial | 90 Days or More and Accruing (2) | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	4,478	7,965
Commercial | Total Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,604	8,644
Commercial | Total Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	11,074	2,850
Commercial | Total Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	36,913	54,360
Commercial | Current and Other | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,505,531	5,513,602
Commercial | Current and Other | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,751,903	2,424,517
Commercial | Current and Other | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,602,925	1,646,749
Residential
Financing Receivable, Past Due [Line Items]
Loans and Leases	7,965,005	8,095,332
Residential | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,933,352	6,157,166
Non-Accrual	0	0
Residential | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,031,653	1,938,166
Non-Accrual	0	0
Residential | Greater than 30 to 59 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	282
Residential | Greater than 30 to 59 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,348	4,401
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	17,844	9,410
Residential | 60 to 89 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,369	2,373
Residential | 90 Days or More and Accruing (2) | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	61,228	26,331
Residential | 90 Days or More and Accruing (2) | Mortgage, net | GNMA Loans
Financing Receivable, Past Due [Line Items]
GNMA Loans past due by 90 days, but not yet repurchased	2,400	1,000
Residential | 90 Days or More and Accruing (2) | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	6,691	3,782
Residential | Total Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	79,072	36,023
Residential | Total Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	17,408	10,556
Residential | Current and Other | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,854,280	6,121,143
Residential | Current and Other | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,014,245	1,927,610
Consumer & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	180,128	195,735
Non-Accrual	0	0
Consumer & other, net | Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	808	778
Consumer & other, net | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	389	519
Consumer & other, net | 90 Days or More and Accruing (2)
Financing Receivable, Past Due [Line Items]
Loans and Leases	179	326
Consumer & other, net | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,376	1,623
Consumer & other, net | Current and Other
Financing Receivable, Past Due [Line Items]
Loans and Leases	$ 178,752	$ 194,112

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+ References

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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