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Commitments and Contingent Liabilities - Schedule of Details on These Fixed and Determinable Obligations (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 30, 2030	Jun. 30, 2025	Dec. 31, 2023
Guarantor Obligations [Line Items]
Within One Year			$ 9,465,453
One to Three Years			784,652
Three to Five Years			35,134
Over Five Years			8,966
Total			10,294,205
Deposits Without a Stated Maturity
Guarantor Obligations [Line Items]
Within One Year			6,590,572
One to Three Years			0
Three to Five Years			0
Over Five Years			0
Total			6,590,572
Time Deposits
Guarantor Obligations [Line Items]
Within One Year			1,445,395
One to Three Years			756,763
Three to Five Years			15,309
Over Five Years			0
Total			2,217,467
Borrowed Funds
Guarantor Obligations [Line Items]
Within One Year			1,400,505
One to Three Years			0
Three to Five Years			0
Over Five Years			0
Total			1,400,505
Operating lease obligations
Guarantor Obligations [Line Items]
Within One Year			6,564
One to Three Years			8,593
Three to Five Years			4,525
Over Five Years			3,556
Total			23,238
Outside Data Processing
Guarantor Obligations [Line Items]
Within One Year			5,450
One to Three Years			11,568
Three to Five Years			13,382
Over Five Years			0
Total			30,400
George Mason Sponsorship
Guarantor Obligations [Line Items]
Within One Year			675
One to Three Years			1,388
Three to Five Years			1,400
Over Five Years			4,675
Total			8,138
George Mason Sponsorship | Termination Option One
Guarantor Obligations [Line Items]
Increase (decrease) in contractual obligation, termination option			$ (3,500)
George Mason Sponsorship | Termination Option One | Minimum
Guarantor Obligations [Line Items]
Contractual obligation, option period			11 years
George Mason Sponsorship | Termination Option One | Maximum
Guarantor Obligations [Line Items]
Contractual obligation, option period			15 years
George Mason Sponsorship | Termination Option Two
Guarantor Obligations [Line Items]
Increase (decrease) in contractual obligation, termination option			$ (3,600)
George Mason Sponsorship | Termination Option Two | Minimum
Guarantor Obligations [Line Items]
Contractual obligation, option period			16 years
George Mason Sponsorship | Termination Option Two | Maximum
Guarantor Obligations [Line Items]
Contractual obligation, option period			20 years
George Mason Sponsorship | Forecast
Guarantor Obligations [Line Items]
Option to terminate	15 years	10 years
LIHTC Investments
Guarantor Obligations [Line Items]
Within One Year			$ 16,292
One to Three Years			6,340
Three to Five Years			518
Over Five Years			735
Total			$ 23,885

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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