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Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized cost
Amortized Cost	$ 21,619,857	$ 19,517,895
Gross unrealized gains
Gross unrealized gains	27,062	1,992
Gross unrealized loss
Gross unrealized losses	960,496	1,273,984
Fair Value
Debt securities available-for-sale	$ 20,686,423	$ 18,245,903
Weighted average yield
Weighted Average Yield	3.18%	2.78%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 10,182,136	$ 10,555,397
Amortized cost - After 1 to 5 years	5,531,033	2,547,936
Amortized Cost	15,713,169	13,103,333
Gross unrealized gains
Gross unrealized gain - Within 1 year	2,162	1,282
Gross unrealized gain - After 1 to 5 years	23,619	151
Gross unrealized gains	25,781	1,433
Gross unrealized loss
Gross unrealized losses - Within 1 year	8,399	46,275
Gross unrealized losses - After 1 to 5 years	23,786	63,381
Gross unrealized losses	32,185	109,656
Fair Value
Fair value - Within 1 year	10,175,899	10,510,404
Fair value - After 1 to 5 years	5,530,866	2,484,706
Debt securities available-for-sale	$ 15,706,765	$ 12,995,110
Weighted average yield
Weighted average yield - Within 1 year	3.68%	3.33%
Weighted average yield - After 1 to 5 years	3.73%	3.07%
Weighted Average Yield	3.70%	3.28%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 6,213	$ 10,538
Amortized cost - After 5 to 10 years	12,050	15,334
Amortized cost - After 10 years	93,542	104,168
Amortized Cost	111,805	130,040
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gain - After 5 to 10 years	0	0
Gross unrealized gain - After 10 years	119	132
Gross unrealized gains	119	132
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	135	345
Gross unrealized losses - After 5 to 10 years	549	904
Gross unrealized losses - After 10 years	6,540	8,639
Gross unrealized losses	7,224	9,888
Fair Value
Fair value - After 1 to 5 years	6,078	10,193
Fair value - After 5 to 10 years	11,501	14,430
Fair value - After 10 years	87,121	95,661
Debt securities available-for-sale	$ 104,700	$ 120,284
Weighted average yield
Weighted average yield - After 1 to 5 years	1.52%	1.53%
Weighted average yield - After 5 to 10 years	2.51%	2.24%
Weighted average yield - After 10 years	2.92%	2.76%
Weighted Average Yield	2.80%	2.60%
Mortgge Backed Securities - Federal agencies
Amortized cost
Amortized cost - Within 1 year	$ 15,380	$ 776
Amortized cost - After 1 to 5 years	82,670	79,542
Amortized cost - After 5 to 10 years	836,304	733,506
Amortized cost - After 10 years	4,859,779	5,468,448
Amortized Cost	5,794,133	6,282,272
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	0
Gross unrealized gain - After 1 to 5 years	8	8
Gross unrealized gain - After 5 to 10 years	247	82
Gross unrealized gain - After 10 years	907	337
Gross unrealized gains	1,162	427
Gross unrealized loss
Gross unrealized losses - Within 1 year	78	5
Gross unrealized losses - After 1 to 5 years	2,102	2,700
Gross unrealized losses - After 5 to 10 years	48,922	45,078
Gross unrealized losses - After 10 years	869,985	1,106,657
Gross unrealized losses	921,087	1,154,440
Fair Value
Fair value - Within 1 year	15,302	771
Fair value - After 1 to 5 years	80,576	76,850
Fair value - After 5 to 10 years	787,629	688,510
Fair value - After 10 years	3,990,701	4,362,128
Debt securities available-for-sale	$ 4,874,208	$ 5,128,259
Weighted average yield
Weighted average yield - Within 1 year	2.23%	1.65%
Weighted average yield - After 1 to 5 years	2.30%	2.35%
Weighted average yield - After 5 to 10 years	2.10%	2.37%
Weighted average yield - After 10 years	1.70%	1.67%
Weighted Average Yield	1.77%	1.75%
Other
Amortized cost
Amortized cost - Within 1 year	$ 500	$ 500
Amortized cost - After 1 to 5 years	250	1,750
Amortized Cost	750	2,250
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	0
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gains	0	0
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	0
Gross unrealized losses - After 1 to 5 years	0	0
Gross unrealized losses	0	0
Fair Value
Fair value - Within 1 year	500	500
Fair value - After 1 to 5 years	250	1,750
Debt securities available-for-sale	$ 750	$ 2,250
Weighted average yield
Weighted average yield - Within 1 year	4.33%	5.00%
Weighted average yield - After 1 to 5 years	4.79%	5.50%
Weighted Average Yield	4.48%	5.39%

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