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Allowance for Credit Losses (Non-Accrual Loans and Leases and Loans and Leases Past Due) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 37,637,013	$ 37,680,901
Non-Accrual	97,548	96,478
Loans Insured or Guaranteed by US Government Authorities [Member]
Financing Receivable, Past Due [Line Items]
Non-Accrual	37,100	41,500
Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	102,121	57,895
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	39,742	47,304
90 Days or More and Accruing (2)
Financing Receivable, Past Due [Line Items]
Loans and leases	81,842	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	30,700	32,100
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	223,705	177,981
Current and Other
Financing Receivable, Past Due [Line Items]
Loans and leases	37,315,760	37,406,442
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans and leases	19,600,480	19,567,672
Commercial real estate | Non-owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	6,189,992	6,278,154
Non-Accrual	17,126	14,577
Commercial real estate | Owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	5,319,529	5,270,294
Non-Accrual	13,613	24,755
Commercial real estate | Multifamily
Financing Receivable, Past Due [Line Items]
Loans and leases	5,735,057	5,804,364
Non-Accrual	0	0
Commercial real estate | Construction & development
Financing Receivable, Past Due [Line Items]
Loans and leases	2,069,727	1,983,213
Non-Accrual	0	0
Commercial real estate | Residential development
Financing Receivable, Past Due [Line Items]
Loans and leases	286,175	231,647
Non-Accrual	0	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Non-owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	26,522	27,954
Commercial real estate | Greater than 30 to 59 Days Past Due | Owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	4,960	1,411
Commercial real estate | Greater than 30 to 59 Days Past Due | Multifamily
Financing Receivable, Past Due [Line Items]
Loans and leases	132	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Construction & development
Financing Receivable, Past Due [Line Items]
Loans and leases	37,903	0
Commercial real estate | Greater than 30 to 59 Days Past Due | Residential development
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Non-owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	422	169
Commercial real estate | 60 to 89 Days Past Due | Multifamily
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Construction & development
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 60 to 89 Days Past Due | Residential development
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
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 90 Days or More and Accruing (2) | Owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	361	0
Commercial real estate | 90 Days or More and Accruing (2) | Multifamily
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 90 Days or More and Accruing (2) | Construction & development
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | 90 Days or More and Accruing (2) | Residential development
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | Total Past Due | Non-owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	26,522	27,954
Commercial real estate | Total Past Due | Owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	5,743	1,580
Commercial real estate | Total Past Due | Multifamily
Financing Receivable, Past Due [Line Items]
Loans and leases	132	0
Commercial real estate | Total Past Due | Construction & development
Financing Receivable, Past Due [Line Items]
Loans and leases	37,903	0
Commercial real estate | Total Past Due | Residential development
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Commercial real estate | Current and Other | Non-owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	6,146,344	6,235,623
Commercial real estate | Current and Other | Owner occupied term
Financing Receivable, Past Due [Line Items]
Loans and leases	5,300,173	5,243,959
Commercial real estate | Current and Other | Multifamily
Financing Receivable, Past Due [Line Items]
Loans and leases	5,734,925	5,804,364
Commercial real estate | Current and Other | Construction & development
Financing Receivable, Past Due [Line Items]
Loans and leases	2,031,824	1,983,213
Commercial real estate | Current and Other | Residential development
Financing Receivable, Past Due [Line Items]
Loans and leases	286,175	231,647
Commercial
Financing Receivable, Past Due [Line Items]
Loans and leases	9,944,830	9,968,096
Commercial | Term
Financing Receivable, Past Due [Line Items]
Loans and leases	5,352,598	5,537,618
Non-Accrual	23,722	29,483
Commercial | Lines of credit & other
Financing Receivable, Past Due [Line Items]
Loans and leases	2,950,782	2,769,643
Non-Accrual	23,639	6,666
Commercial | Leases & equipment finance
Financing Receivable, Past Due [Line Items]
Loans and leases	1,641,450	1,660,835
Non-Accrual	19,448	20,997
Commercial | Greater than 30 to 59 Days Past Due | Term
Financing Receivable, Past Due [Line Items]
Loans and leases	1,306	1,711
Commercial | Greater than 30 to 59 Days Past Due | Lines of credit & other
Financing Receivable, Past Due [Line Items]
Loans and leases	3,959	5,345
Commercial | Greater than 30 to 59 Days Past Due | Leases & equipment finance
Financing Receivable, Past Due [Line Items]
Loans and leases	17,019	15,318
Commercial | 60 to 89 Days Past Due | Term
Financing Receivable, Past Due [Line Items]
Loans and leases	717	893
Commercial | 60 to 89 Days Past Due | Lines of credit & other
Financing Receivable, Past Due [Line Items]
Loans and leases	1,284	5,523
Commercial | 60 to 89 Days Past Due | Leases & equipment finance
Financing Receivable, Past Due [Line Items]
Loans and leases	15,466	17,117
Commercial | 90 Days or More and Accruing (2) | Term
Financing Receivable, Past Due [Line Items]
Loans and leases	420	0
Commercial | 90 Days or More and Accruing (2) | Lines of credit & other
Financing Receivable, Past Due [Line Items]
Loans and leases	0	206
Commercial | 90 Days or More and Accruing (2) | Leases & equipment finance
Financing Receivable, Past Due [Line Items]
Loans and leases	5,161	4,478
Commercial | Total Past Due | Term
Financing Receivable, Past Due [Line Items]
Loans and leases	2,443	2,604
Commercial | Total Past Due | Lines of credit & other
Financing Receivable, Past Due [Line Items]
Loans and leases	5,243	11,074
Commercial | Total Past Due | Leases & equipment finance
Financing Receivable, Past Due [Line Items]
Loans and leases	37,646	36,913
Commercial | Current and Other | Term
Financing Receivable, Past Due [Line Items]
Loans and leases	5,326,433	5,505,531
Commercial | Current and Other | Lines of credit & other
Financing Receivable, Past Due [Line Items]
Loans and leases	2,921,900	2,751,903
Commercial | Current and Other | Leases & equipment finance
Financing Receivable, Past Due [Line Items]
Loans and leases	1,584,356	1,602,925
Residential
Financing Receivable, Past Due [Line Items]
Loans and leases	7,912,599	7,965,005
Residential | Mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	5,829,833	5,933,352
Non-Accrual	0	0
Residential | Home equity loans & lines
Financing Receivable, Past Due [Line Items]
Loans and leases	2,082,766	2,031,653
Non-Accrual	0	0
Residential | Greater than 30 to 59 Days Past Due | Mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	0	0
Residential | Greater than 30 to 59 Days Past Due | Home equity loans & lines
Financing Receivable, Past Due [Line Items]
Loans and leases	9,514	5,348
Residential | 60 to 89 Days Past Due | Mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	18,054	17,844
Residential | 60 to 89 Days Past Due | Home equity loans & lines
Financing Receivable, Past Due [Line Items]
Loans and leases	3,422	5,369
Residential | 90 Days or More and Accruing (2) | Mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	71,237	61,228
Residential | 90 Days or More and Accruing (2) | Mortgage | GNMA Loans
Financing Receivable, Past Due [Line Items]
GNMA Loans past due by 90 days, but not yet repurchased	2,000	2,400
Residential | 90 Days or More and Accruing (2) | Home equity loans & lines
Financing Receivable, Past Due [Line Items]
Loans and leases	4,326	6,691
Residential | Total Past Due | Mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	89,291	79,072
Residential | Total Past Due | Home equity loans & lines
Financing Receivable, Past Due [Line Items]
Loans and leases	17,262	17,408
Residential | Current and Other | Mortgage
Financing Receivable, Past Due [Line Items]
Loans and leases	5,740,542	5,854,280
Residential | Current and Other | Home equity loans & lines
Financing Receivable, Past Due [Line Items]
Loans and leases	2,065,504	2,014,245
Consumer & other
Financing Receivable, Past Due [Line Items]
Loans and leases	179,104	180,128
Non-Accrual	0	0
Consumer & other | Greater than 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	806	808
Consumer & other | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	377	389
Consumer & other | 90 Days or More and Accruing (2)
Financing Receivable, Past Due [Line Items]
Loans and leases	337	179
Consumer & other | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans and leases	1,520	1,376
Consumer & other | Current and Other
Financing Receivable, Past Due [Line Items]
Loans and leases	$ 177,584	$ 178,752

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- Definition

GNMA Loans past due by 90 days, but not yet repurchased

+ 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
-Topic 326
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-Section 50
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. 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
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

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