Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Oct. 15, 2022
Amortized cost
Amortized Cost	$ 18,715,779	$ 19,562,549
Gross unrealized gains
Gross unrealized gains	1,980	1,516
Gross unrealized loss
Gross unrealized losses	1,544,631	1,759,691
Fair Value
Debt securities available-for-sale	$ 17,173,128	$ 17,804,374
Weighted average yield
Weighted Average Yield	1.84%	1.75%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 4,724,780	$ 4,576,127
Amortized cost - After 1 to 5 years	5,991,694	6,793,739
Amortized cost - After 5 to 10 years	308,525	308,854
Amortized Cost	11,024,999	11,678,720
Gross unrealized gains
Gross unrealized gain - Within 1 year	622	506
Gross unrealized gain - After 1 to 5 years	43	0
Gross unrealized gain - After 5 to 10 years	0	0
Gross unrealized gains	665	506
Gross unrealized loss
Gross unrealized losses - Within 1 year	50,140	47,156
Gross unrealized losses - After 1 to 5 years	308,049	410,858
Gross unrealized losses - After 5 to 10 years	32,728	40,264
Gross unrealized losses	390,917	498,278	$ 873,000
Fair Value
Fair value - Within 1 year	4,675,262	4,529,477
Fair value - After 1 to 5 years	5,683,688	6,382,881
Fair value - After 5 to 10 years	275,797	268,590
Debt securities available-for-sale	$ 10,634,747	$ 11,180,948
Weighted average yield
Weighted average yield - Within 1 year	2.69%	2.42%
Weighted average yield - After 1 to 5 years	1.33%	1.35%
Weighted average yield - After 5 to 10 years	1.63%	1.63%
Weighted Average Yield	1.92%	1.78%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 13,109	$ 3,914
Amortized cost - After 5 to 10 years	34,671	47,979
Amortized cost - After 10 years	123,200	127,639
Amortized Cost	170,980	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	34	24
Gross unrealized gains	34	24
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	733	213
Gross unrealized losses - After 5 to 10 years	2,230	3,428
Gross unrealized losses - After 10 years	9,279	10,719
Gross unrealized losses	12,242	14,360
Fair Value
Fair value - After 1 to 5 years	12,376	3,701
Fair value - After 5 to 10 years	32,441	44,551
Fair value - After 10 years	113,955	116,944
Debt securities available-for-sale	$ 158,772	$ 165,196
Weighted average yield
Weighted average yield - After 1 to 5 years	1.58%	1.77%
Weighted average yield - After 5 to 10 years	1.80%	1.73%
Weighted average yield - After 10 years	2.56%	2.53%
Weighted Average Yield	2.33%	2.30%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 460
Amortized cost - After 1 to 5 years	71,211	$ 74,328
Amortized cost - After 5 to 10 years	837,061	866,757
Amortized cost - After 10 years	6,610,019	6,762,150
Amortized Cost	7,518,751	7,703,235
Gross unrealized gains
Gross unrealized gain - Within 1 year	0
Gross unrealized gain - After 1 to 5 years	14	11
Gross unrealized gain - After 5 to 10 years	47	43
Gross unrealized gain - After 10 years	1,220	932
Gross unrealized gains	1,281	986
Gross unrealized loss
Gross unrealized losses - Within 1 year	3
Gross unrealized losses - After 1 to 5 years	2,721	3,428
Gross unrealized losses - After 5 to 10 years	52,682	58,997
Gross unrealized losses - After 10 years	1,086,066	1,184,626
Gross unrealized losses	1,141,472	1,247,051
Fair Value
Fair value - Within 1 year	457
Fair value - After 1 to 5 years	68,504	70,911
Fair value - After 5 to 10 years	784,426	807,803
Fair value - After 10 years	5,525,173	5,578,456
Debt securities available-for-sale	$ 6,378,560	$ 6,457,170
Weighted average yield
Weighted average yield - Within 1 year	3.37%
Weighted average yield - After 1 to 5 years	2.36%	2.33%
Weighted average yield - After 5 to 10 years	2.19%	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	$ 1,049	$ 1,062
Amortized Cost	1,049	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	0	2
Gross unrealized losses	0	2
Fair Value
Fair value - After 1 to 5 years	1,049	1,060
Debt securities available-for-sale	$ 1,049	$ 1,060
Weighted average yield
Weighted average yield - After 1 to 5 years	3.98%	3.98%
Weighted Average Yield	3.98%	3.98%

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