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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
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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

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