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Investment Securities - Gross Gains and Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 2,707,799	$ 2,400,781
Gross unrealized gains	1,478	3
Gross unrealized losses	(241,434)	(367,982)
Fair value	2,467,843	2,032,802
Agency bond securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	179,227	240,628
Gross unrealized gains	0	0
Gross unrealized losses	(22,252)	(38,132)
Fair value	156,975	202,496
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,145,925	2,121,037
Gross unrealized gains	1,392	3
Gross unrealized losses	(212,399)	(323,467)
Fair value	1,934,918	1,797,573
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost		10,000
Gross unrealized gains		0
Gross unrealized losses		(110)
Fair value		9,890
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	28,137	29,116
Gross unrealized gains	0	0
Gross unrealized losses	(5,581)	(6,273)
Fair value	22,556	$ 22,843
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains	86
Gross unrealized losses	(1,202)
Amortized cost	354,510
Available-for-sale securities	$ 353,394

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