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Investment Securities - Available For Sale with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Available for sale securities    
Less than 12 months Fair Value $ 902,000 $ 255,000
Less than 12 months Unrealized Losses 3,000 0
12 months or longer Fair Value 59,719,000 81,230,000
12 months or longer Unrealized Losses 4,382,000 6,758,000
Total Fair Value 60,621,000 81,485,000
Total Unrealized Losses 4,385,000 6,758,000
Unallocated PLM fair value basis adjustments 8,000 (47,000)
U.S. agency mortgage-backed securities    
Available for sale securities    
Less than 12 months Fair Value 4,000 0
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 44,416,000 51,833,000
12 months or longer Unrealized Losses 3,555,000 5,429,000
Total Fair Value 44,420,000 51,833,000
Total Unrealized Losses 3,555,000 5,429,000
Less than 12 months unrealized losses less than stated amount 500  
U.S. Treasury securities    
Available for sale securities    
Less than 12 months Fair Value 757,000 243,000
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 5,380,000 12,727,000
12 months or longer Unrealized Losses 226,000 471,000
Total Fair Value 6,137,000 12,970,000
Total Unrealized Losses 226,000 471,000
Less than 12 months unrealized losses less than stated amount 500 500
Corporate debt securities    
Available for sale securities    
Less than 12 months Fair Value 0 0
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 5,092,000 9,579,000
12 months or longer Unrealized Losses 411,000 587,000
Total Fair Value 5,092,000 9,579,000
Total Unrealized Losses 411,000 587,000
Asset-backed securities    
Available for sale securities    
Less than 12 months Fair Value 114,000 12,000
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 4,164,000 5,888,000
12 months or longer Unrealized Losses 148,000 196,000
Total Fair Value 4,278,000 5,900,000
Total Unrealized Losses 148,000 196,000
Less than 12 months unrealized losses less than stated amount 500 500
U.S. state and municipal securities    
Available for sale securities    
Less than 12 months Fair Value 27,000 0
Less than 12 months Unrealized Losses 3,000 0
12 months or longer Fair Value 535,000 549,000
12 months or longer Unrealized Losses 32,000 54,000
Total Fair Value 562,000 549,000
Total Unrealized Losses 35,000 54,000
Foreign government agency securities    
Available for sale securities    
Less than 12 months Fair Value   0
Less than 12 months Unrealized Losses   0
12 months or longer Fair Value   527,000
12 months or longer Unrealized Losses   6,000
Total Fair Value   527,000
Total Unrealized Losses   6,000
Non-agency commercial mortgage-backed securities    
Available for sale securities    
Less than 12 months Fair Value 0 0
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 113,000 109,000
12 months or longer Unrealized Losses 8,000 12,000
Total Fair Value 113,000 109,000
Total Unrealized Losses 8,000 12,000
Other    
Available for sale securities    
Less than 12 months Fair Value 0 0
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 19,000 18,000
12 months or longer Unrealized Losses 2,000 3,000
Total Fair Value 19,000 18,000
Total Unrealized Losses $ 2,000 $ 3,000