Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized cost
Amortized Cost	$ 18,229,219	$ 18,101,163
Gross unrealized gains
Gross unrealized gains	7,086	1,394
Gross unrealized loss
Gross unrealized losses	1,050,182	1,373,513
Fair Value
Debt securities available-for-sale	$ 17,186,123	$ 16,729,044
Weighted average yield
Weighted Average Yield	2.84%	2.35%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 8,914,560	$ 7,103,518
Amortized cost - After 1 to 5 years	2,715,749	3,598,209
Amortized cost - After 5 to 10 years		307,512
Amortized Cost	11,630,309	11,009,239
Gross unrealized gains
Gross unrealized gain - Within 1 year	1,555	526
Gross unrealized gain - After 1 to 5 years	3,393	84
Gross unrealized gain - After 5 to 10 years		0
Gross unrealized gains	4,948	610
Gross unrealized loss
Gross unrealized losses - Within 1 year	45,154	59,415
Gross unrealized losses - After 1 to 5 years	65,673	170,209
Gross unrealized losses - After 5 to 10 years		33,164
Gross unrealized losses	110,827	262,788
Fair Value
Fair value - Within 1 year	8,870,961	7,044,629
Fair value - After 1 to 5 years	2,653,469	3,428,084
Fair value - After 5 to 10 years		274,348
Debt securities available-for-sale	$ 11,524,430	$ 10,747,061
Weighted average yield
Weighted average yield - Within 1 year	3.77%	3.51%
Weighted average yield - After 1 to 5 years	2.35%	1.35%
Weighted average yield - After 5 to 10 years		1.63%
Weighted Average Yield	3.44%	2.75%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 12,176	$ 17,899
Amortized cost - After 5 to 10 years	16,512	20,503
Amortized cost - After 10 years	107,656	108,280
Amortized Cost	136,344	146,682
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gain - After 5 to 10 years	0	2
Gross unrealized gain - After 10 years	403	29
Gross unrealized gains	403	31
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	393	838
Gross unrealized losses - After 5 to 10 years	763	1,321
Gross unrealized losses - After 10 years	7,038	9,868
Gross unrealized losses	8,194	12,027
Fair Value
Fair value - After 1 to 5 years	11,783	17,061
Fair value - After 5 to 10 years	15,749	19,184
Fair value - After 10 years	101,021	98,441
Debt securities available-for-sale	$ 128,553	$ 134,686
Weighted average yield
Weighted average yield - After 1 to 5 years	1.54%	1.55%
Weighted average yield - After 5 to 10 years	2.25%	2.28%
Weighted average yield - After 10 years	2.76%	2.54%
Weighted Average Yield	2.59%	2.38%
Mortgage Backed Securities - federal agencies
Amortized cost
Amortized cost - Within 1 year	$ 1,393	$ 637
Amortized cost - After 1 to 5 years	74,263	82,310
Amortized cost - After 5 to 10 years	781,628	792,431
Amortized cost - After 10 years	5,603,282	6,067,353
Amortized Cost	6,460,566	6,942,731
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	0
Gross unrealized gain - After 1 to 5 years	11	11
Gross unrealized gain - After 5 to 10 years	244	75
Gross unrealized gain - After 10 years	1,480	667
Gross unrealized gains	1,735	753
Gross unrealized loss
Gross unrealized losses - Within 1 year	14	3
Gross unrealized losses - After 1 to 5 years	1,993	3,536
Gross unrealized losses - After 5 to 10 years	33,408	48,250
Gross unrealized losses - After 10 years	895,746	1,046,909
Gross unrealized losses	931,161	1,098,698
Fair Value
Fair value - Within 1 year	1,379	634
Fair value - After 1 to 5 years	72,281	78,785
Fair value - After 5 to 10 years	748,464	744,256
Fair value - After 10 years	4,709,016	5,021,111
Debt securities available-for-sale	$ 5,531,140	$ 5,844,786
Weighted average yield
Weighted average yield - Within 1 year	1.69%	3.72%
Weighted average yield - After 1 to 5 years	2.39%	2.34%
Weighted average yield - After 5 to 10 years	2.36%	2.28%
Weighted average yield - After 10 years	1.67%	1.64%
Weighted Average Yield	1.76%	1.72%
Other
Amortized cost
Amortized cost - Within 1 year	$ 500	$ 1,011
Amortized cost - After 1 to 5 years	1,500	1,500
Amortized Cost	2,000	2,511
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	1,011
Fair value - After 1 to 5 years	1,500	1,500
Debt securities available-for-sale	$ 2,000	$ 2,511
Weighted average yield
Weighted average yield - Within 1 year	4.00%	4.00%
Weighted average yield - After 1 to 5 years	8.50%	8.50%
Weighted Average Yield	7.38%	6.69%

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