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Securities - VIEs (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Private equity and venture capital funds | Current Investments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss $ 14,100 $ 13,700
Private equity and venture capital funds | Unfunded Commitments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 5,300 6,000
Pooled investment vehicle | Current Investments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 3,200 2,900
SBIC | Current Investments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 7,300 7,300
SBIC | Unfunded Commitments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 5,700 5,700
Affordable housing    
Variable Interest Entity [Line Items]    
Tax credits recaptured 3,000 2,500
Affordable housing | Current Investments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 7,100 7,600
Affordable housing | Unfunded Commitments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 2,900 2,400
Non-marketable and other equity investments | Current Investments    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 10,000 10,000
Variable Interest Entity, Not Primary Beneficiary | Private equity and venture capital funds    
Variable Interest Entity [Line Items]    
Carrying Amount 14,067 13,685
Maximum Exposure to Loss 19,332 20,208
Liability Recognized 0 0
Variable Interest Entity, Not Primary Beneficiary | Pooled investment vehicle    
Variable Interest Entity [Line Items]    
Carrying Amount 3,202 2,876
Maximum Exposure to Loss 3,202 2,876
Liability Recognized 0 0
Variable Interest Entity, Not Primary Beneficiary | SBIC    
Variable Interest Entity [Line Items]    
Carrying Amount 7,292 7,292
Maximum Exposure to Loss 13,000 13,000
Liability Recognized 0 0
Variable Interest Entity, Not Primary Beneficiary | Affordable housing    
Variable Interest Entity [Line Items]    
Carrying Amount 7,079 7,634
Maximum Exposure to Loss 13,045 12,519
Liability Recognized 0 0
Variable Interest Entity, Not Primary Beneficiary | Non-marketable and other equity investments    
Variable Interest Entity [Line Items]    
Carrying Amount 10,000 10,000
Maximum Exposure to Loss 10,000 10,000
Liability Recognized $ 0 $ 0