Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Oct. 15, 2022
Amortized cost
Amortized Cost	$ 18,993,381	$ 19,562,549
Gross unrealized gains
Gross unrealized gains	621	1,516
Gross unrealized loss
Gross unrealized losses	1,864,144	1,759,691
Fair Value
Debt securities available-for-sale	$ 17,129,858	$ 17,804,374
Weighted average yield
Weighted Average Yield	2.30%	1.75%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 7,041,817	$ 4,576,127
Amortized cost - After 1 to 5 years	4,364,065	6,793,739
Amortized cost - After 5 to 10 years	307,852	308,854
Amortized Cost	11,713,734	11,678,720
Gross unrealized gains
Gross unrealized gain - Within 1 year	421	506
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gain - After 5 to 10 years	0	0
Gross unrealized gains	421	506
Gross unrealized loss
Gross unrealized losses - Within 1 year	67,663	47,156
Gross unrealized losses - After 1 to 5 years	271,553	410,858
Gross unrealized losses - After 5 to 10 years	45,258	40,264
Gross unrealized losses	384,474	498,278	$ 873,000
Fair Value
Fair value - Within 1 year	6,974,575	4,529,477
Fair value - After 1 to 5 years	4,092,512	6,382,881
Fair value - After 5 to 10 years	262,594	268,590
Debt securities available-for-sale	$ 11,329,681	$ 11,180,948
Weighted average yield
Weighted average yield - Within 1 year	3.51%	2.42%
Weighted average yield - After 1 to 5 years	1.36%	1.35%
Weighted average yield - After 5 to 10 years	1.63%	1.63%
Weighted Average Yield	2.65%	1.78%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 19,312	$ 3,914
Amortized cost - After 5 to 10 years	22,371	47,979
Amortized cost - After 10 years	112,566	127,639
Amortized Cost	154,249	179,532
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	7	24
Gross unrealized gains	7	24
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	1,163	213
Gross unrealized losses - After 5 to 10 years	1,857	3,428
Gross unrealized losses - After 10 years	13,222	10,719
Gross unrealized losses	16,242	14,360
Fair Value
Fair value - After 1 to 5 years	18,149	3,701
Fair value - After 5 to 10 years	20,514	44,551
Fair value - After 10 years	99,351	116,944
Debt securities available-for-sale	$ 138,014	$ 165,196
Weighted average yield
Weighted average yield - After 1 to 5 years	1.53%	1.77%
Weighted average yield - After 5 to 10 years	2.26%	1.73%
Weighted average yield - After 10 years	2.54%	2.53%
Weighted Average Yield	2.37%	2.30%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 1,302
Amortized cost - After 1 to 5 years	79,987	$ 74,328
Amortized cost - After 5 to 10 years	778,578	866,757
Amortized cost - After 10 years	6,264,509	6,762,150
Amortized Cost	7,124,376	7,703,235
Gross unrealized gains
Gross unrealized gain - Within 1 year	0
Gross unrealized gain - After 1 to 5 years	3	11
Gross unrealized gain - After 5 to 10 years	13	43
Gross unrealized gain - After 10 years	177	932
Gross unrealized gains	193	986
Gross unrealized loss
Gross unrealized losses - Within 1 year	48
Gross unrealized losses - After 1 to 5 years	4,760	3,428
Gross unrealized losses - After 5 to 10 years	71,731	58,997
Gross unrealized losses - After 10 years	1,386,889	1,184,626
Gross unrealized losses	1,463,428	1,247,051
Fair Value
Fair value - Within 1 year	1,254
Fair value - After 1 to 5 years	75,230	70,911
Fair value - After 5 to 10 years	706,860	807,803
Fair value - After 10 years	4,877,797	5,578,456
Debt securities available-for-sale	$ 5,661,141	$ 6,457,170
Weighted average yield
Weighted average yield - Within 1 year	3.56%
Weighted average yield - After 1 to 5 years	2.37%	2.33%
Weighted average yield - After 5 to 10 years	2.22%	2.16%
Weighted average yield - After 10 years	1.65%	1.61%
Weighted Average Yield	1.72%	1.68%
Other
Amortized cost
Amortized cost - Within 1 year	$ 1,022
Amortized cost - After 1 to 5 years		$ 1,062
Amortized Cost	1,022	1,062
Gross unrealized gains
Gross unrealized gain - Within 1 year	0
Gross unrealized gain - After 1 to 5 years		0
Gross unrealized gains	0	0
Gross unrealized loss
Gross unrealized losses - Within 1 year	0
Gross unrealized losses - After 1 to 5 years		2
Gross unrealized losses	0	2
Fair Value
Fair value - Within 1 year	1,022
Fair value - After 1 to 5 years		1,060
Debt securities available-for-sale	$ 1,022	$ 1,060
Weighted average yield
Weighted average yield - Within 1 year	3.99%
Weighted average yield - After 1 to 5 years		3.98%
Weighted Average Yield	3.99%	3.98%

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