Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Held-to-maturity securities
Amortized cost	$ 4,400	$ 4,400
Estimated fair value	4,400	4,400
Carrying value	4,400	4,400
Available-for-sale securities
Amortized cost	5,397,669	5,472,310
Gross unrealized gains	25,197	9,189
Gross unrealized losses	(413,023)	(493,583)
Estimated fair value, Available for sale securities	5,009,843	4,987,916
Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities	5,009,843	4,987,916
Reported Value Measurement
Available-for-sale securities
Estimated fair value, Available for sale securities	5,009,843	4,987,916
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost	5,245,239	5,315,488
Gross unrealized gains	25,192	8,858
Gross unrealized losses	(401,353)	(489,170)
Residential mortgage-backed securities \| Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities	4,869,078	4,835,176
Residential mortgage-backed securities \| Reported Value Measurement
Available-for-sale securities
Estimated fair value, Available for sale securities	4,869,078	4,835,176
Mortgage-backed securities
Available-for-sale securities
Estimated fair value, Available for sale securities	921,929	1,001,184
Fannie Mae and Freddie Mac
Available-for-sale securities
Estimated fair value, Available for sale securities	3,947,149	3,833,992
States and political subdivisions
Available-for-sale securities
Amortized cost	152,430	156,822
Gross unrealized gains	5	331
Gross unrealized losses	(11,670)	(4,413)
States and political subdivisions \| Estimated Fair Value
Available-for-sale securities
Estimated fair value, Available for sale securities	140,765	152,740
States and political subdivisions \| Reported Value Measurement
Available-for-sale securities
Estimated fair value, Available for sale securities	140,765	152,740
Other Debt Obligations
Held-to-maturity securities
Amortized cost	4,400	4,400
Estimated fair value	4,400	4,400
Carrying value	$ 4,400	$ 4,400

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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