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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
Jun. 30, 2025
Dec. 31, 2024
Available for sale securities    
Less than 12 months Fair Value $ 2,171,000 $ 255,000
Less than 12 months Unrealized Losses 5,000 0
12 months or longer Fair Value 64,473,000 81,230,000
12 months or longer Unrealized Losses 4,980,000 6,758,000
Total Fair Value 66,644,000 81,485,000
Total Unrealized Losses 4,985,000 6,758,000
Unallocated portfolio layer method fair value basis adjustments 9,000 (47,000)
U.S. agency mortgage-backed securities    
Available for sale securities    
Less than 12 months Fair Value 1,000 0
Less than 12 months Unrealized Losses 0 0
12 months or longer Fair Value 46,254,000 51,833,000
12 months or longer Unrealized Losses 3,992,000 5,429,000
Total Fair Value 46,255,000 51,833,000
Total Unrealized Losses 3,992,000 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 2,024,000 243,000
Less than 12 months Unrealized Losses 1,000 0
12 months or longer Fair Value 6,994,000 12,727,000
12 months or longer Unrealized Losses 283,000 471,000
Total Fair Value 9,018,000 12,970,000
Total Unrealized Losses 284,000 471,000
Less than 12 months unrealized losses less than stated amount   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 6,241,000 9,579,000
12 months or longer Unrealized Losses 476,000 587,000
Total Fair Value 6,241,000 9,579,000
Total Unrealized Losses 476,000 587,000
Asset-backed securities    
Available for sale securities    
Less than 12 months Fair Value 119,000 12,000
Less than 12 months Unrealized Losses 1,000 0
12 months or longer Fair Value 4,324,000 5,888,000
12 months or longer Unrealized Losses 178,000 196,000
Total Fair Value 4,443,000 5,900,000
Total Unrealized Losses 179,000 196,000
Less than 12 months unrealized losses less than stated amount   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 530,000 549,000
12 months or longer Unrealized Losses 39,000 54,000
Total Fair Value 557,000 549,000
Total Unrealized Losses 42,000 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 111,000 109,000
12 months or longer Unrealized Losses 10,000 12,000
Total Fair Value 111,000 109,000
Total Unrealized Losses 10,000 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