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Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans and Leases	$ 37,616,101	$ 37,680,901
Non-Accrual	122,402	96,478
Loans Insured or Guaranteed by US Government Authorities [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	42,300	41,500
Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	117,047	57,895
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	40,979	47,304
90 Days or More and Accruing (2)
Financing Receivable, Past Due [Line Items]
Loans and Leases	55,376	72,782
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	24,200	32,100
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	213,402	177,981
Current and Other
Financing Receivable, Past Due [Line Items]
Loans and Leases	37,280,297	37,406,442
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and Leases	19,637,032	19,567,672
Commercial real estate | Non-owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	6,179,261	6,278,154
Non-Accrual	16,926	14,577
Commercial real estate | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,303,424	5,270,294
Non-Accrual	24,984	24,755
Commercial real estate | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,831,266	5,804,364
Non-Accrual	0	0
Commercial real estate | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,070,732	1,983,213
Non-Accrual	0	0
Commercial real estate | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	252,349	231,647
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	56,218	27,954
Commercial real estate | Greater than 30 to 59 Days Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,999	1,411
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	386	0
Commercial real estate | 60 to 89 Days Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	384	169
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	0
Commercial real estate | 90 Days or More and Accruing (2) | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
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	56,604	27,954
Commercial real estate | Total Past Due | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	3,383	1,580
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	6,105,731	6,235,623
Commercial real estate | Current and Other | Owner occupied term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,275,057	5,243,959
Commercial real estate | Current and Other | Multifamily, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,831,266	5,804,364
Commercial real estate | Current and Other | Construction & development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,070,732	1,983,213
Commercial real estate | Current and Other | Residential development, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	252,349	231,647
Commercial
Financing Receivable, Past Due [Line Items]
Loans and Leases	9,887,854	9,968,096
Commercial | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,490,189	5,537,618
Non-Accrual	28,809	29,483
Commercial | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,753,613	2,769,643
Non-Accrual	33,582	6,666
Commercial | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,644,052	1,660,835
Non-Accrual	18,101	20,997
Commercial | Greater than 30 to 59 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,828	1,711
Commercial | Greater than 30 to 59 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	4,953	5,345
Commercial | Greater than 30 to 59 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	24,908	15,318
Commercial | 60 to 89 Days Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,091	893
Commercial | 60 to 89 Days Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	3,863	5,523
Commercial | 60 to 89 Days Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	11,521	17,117
Commercial | 90 Days or More and Accruing (2) | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	0
Commercial | 90 Days or More and Accruing (2) | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	75	206
Commercial | 90 Days or More and Accruing (2) | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	0	4,478
Commercial | Total Past Due | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	3,919	2,604
Commercial | Total Past Due | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	8,891	11,074
Commercial | Total Past Due | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	36,429	36,913
Commercial | Current and Other | Term, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,457,461	5,505,531
Commercial | Current and Other | Lines of credit & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,711,140	2,751,903
Commercial | Current and Other | Leases & equipment finance, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,589,522	1,602,925
Residential
Financing Receivable, Past Due [Line Items]
Loans and Leases	7,917,488	7,965,005
Residential | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,878,427	5,933,352
Non-Accrual	0	0
Residential | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,039,061	2,031,653
Non-Accrual	0	0
Residential | Greater than 30 to 59 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	19,209	0
Residential | Greater than 30 to 59 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	6,302	5,348
Residential | 60 to 89 Days Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	15,722	17,844
Residential | 60 to 89 Days Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	6,809	5,369
Residential | 90 Days or More and Accruing (2) | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	50,277	61,228
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	2,600	2,400
Residential | 90 Days or More and Accruing (2) | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	4,746	6,691
Residential | Total Past Due | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	85,208	79,072
Residential | Total Past Due | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	17,857	17,408
Residential | Current and Other | Mortgage, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	5,793,219	5,854,280
Residential | Current and Other | Home equity loans & lines, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	2,021,204	2,014,245
Consumer & other, net
Financing Receivable, Past Due [Line Items]
Loans and Leases	173,727	180,128
Non-Accrual	0	0
Consumer & other, net | Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	630	808
Consumer & other, net | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	203	389
Consumer & other, net | 90 Days or More and Accruing (2)
Financing Receivable, Past Due [Line Items]
Loans and Leases	278	179
Consumer & other, net | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans and Leases	1,111	1,376
Consumer & other, net | Current and Other
Financing Receivable, Past Due [Line Items]
Loans and Leases	$ 172,616	$ 178,752

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+ References

No definition available.

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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
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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