Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Oct. 15, 2022
Amortized cost
Amortized Cost	$ 18,875,236	$ 19,562,549
Gross unrealized gains
Gross unrealized gains	1,399	1,516
Gross unrealized loss
Gross unrealized losses	1,634,418	1,759,691
Fair Value
Debt securities available-for-sale	$ 17,242,217	$ 17,804,374
Weighted average yield
Weighted Average Yield	2.07%	1.75%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 5,923,108	$ 4,576,127
Amortized cost - After 1 to 5 years	5,164,568	6,793,739
Amortized cost - After 5 to 10 years	308,191	308,854
Amortized Cost	11,395,867	11,678,720
Gross unrealized gains
Gross unrealized gain - Within 1 year	738	506
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gain - After 5 to 10 years	0	0
Gross unrealized gains	738	506
Gross unrealized loss
Gross unrealized losses - Within 1 year	64,897	47,156
Gross unrealized losses - After 1 to 5 years	325,078	410,858
Gross unrealized losses - After 5 to 10 years	38,648	40,264
Gross unrealized losses	428,623	498,278	$ 873,000
Fair Value
Fair value - Within 1 year	5,858,949	4,529,477
Fair value - After 1 to 5 years	4,839,490	6,382,881
Fair value - After 5 to 10 years	269,543	268,590
Debt securities available-for-sale	$ 10,967,982	$ 11,180,948
Weighted average yield
Weighted average yield - Within 1 year	3.17%	2.42%
Weighted average yield - After 1 to 5 years	1.34%	1.35%
Weighted average yield - After 5 to 10 years	1.63%	1.63%
Weighted Average Yield	2.30%	1.78%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 21,581	$ 3,914
Amortized cost - After 5 to 10 years	22,328	47,979
Amortized cost - After 10 years	118,716	127,639
Amortized Cost	162,625	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	21	24
Gross unrealized gains	21	24
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	1,416	213
Gross unrealized losses - After 5 to 10 years	1,871	3,428
Gross unrealized losses - After 10 years	11,307	10,719
Gross unrealized losses	14,594	14,360
Fair Value
Fair value - After 1 to 5 years	20,165	3,701
Fair value - After 5 to 10 years	20,457	44,551
Fair value - After 10 years	107,430	116,944
Debt securities available-for-sale	$ 148,052	$ 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	1.96%	1.73%
Weighted average yield - After 10 years	2.57%	2.53%
Weighted Average Yield	2.35%	2.30%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 2,049
Amortized cost - After 1 to 5 years	74,177	$ 74,328
Amortized cost - After 5 to 10 years	818,545	866,757
Amortized cost - After 10 years	6,420,939	6,762,150
Amortized Cost	7,315,710	7,703,235
Gross unrealized gains
Gross unrealized gain - Within 1 year	0
Gross unrealized gain - After 1 to 5 years	7	11
Gross unrealized gain - After 5 to 10 years	27	43
Gross unrealized gain - After 10 years	606	932
Gross unrealized gains	640	986
Gross unrealized loss
Gross unrealized losses - Within 1 year	48
Gross unrealized losses - After 1 to 5 years	4,006	3,428
Gross unrealized losses - After 5 to 10 years	61,887	58,997
Gross unrealized losses - After 10 years	1,125,259	1,184,626
Gross unrealized losses	1,191,200	1,247,051
Fair Value
Fair value - Within 1 year	2,001
Fair value - After 1 to 5 years	70,178	70,911
Fair value - After 5 to 10 years	756,685	807,803
Fair value - After 10 years	5,296,286	5,578,456
Debt securities available-for-sale	$ 6,125,150	$ 6,457,170
Weighted average yield
Weighted average yield - Within 1 year	3.39%
Weighted average yield - After 1 to 5 years	2.36%	2.33%
Weighted average yield - After 5 to 10 years	2.20%	2.16%
Weighted average yield - After 10 years	1.63%	1.61%
Weighted Average Yield	1.70%	1.68%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 1,034	$ 1,062
Amortized Cost	1,034	1,062
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gains	0	0
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	1	2
Gross unrealized losses	1	2
Fair Value
Fair value - After 1 to 5 years	1,033	1,060
Debt securities available-for-sale	$ 1,033	$ 1,060
Weighted average yield
Weighted average yield - After 1 to 5 years	3.99%	3.98%
Weighted Average Yield	3.99%	3.98%

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