Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Oct. 15, 2022	Dec. 31, 2021
Amortized cost
Amortized cost - Within 1 year	$ 4,576,127
Amortized cost - After 1 to 5 years	6,873,043
Amortized cost - After 5 to 10 years	1,223,590
Amortized cost - After 10 years	6,889,789
Amortized Cost	19,562,549		$ 25,061,224
Gross unrealized gains
Gross unrealized gains	1,516		205,393
Gross unrealized loss
Gross unrealized losses	1,759,691		298,348
Fair Value
Fair value - Within 1 year	4,529,477
Fair value - After 1 to 5 years	6,458,553
Fair value - After 5 to 10 years	1,120,944
Fair value - After 10 years	5,695,400
Debt securities available-for-sale	$ 17,804,374		$ 24,968,269
Weighted average yield
Weighted Average Yield	1.75%		1.42%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 4,576,127		$ 1,225,558
Amortized cost - After 1 to 5 years	6,793,739		10,059,163
Amortized cost - After 5 to 10 years	308,854		4,563,265
Amortized Cost	11,678,720		15,847,986
Gross unrealized gains
Gross unrealized gain - Within 1 year	506		13,556
Gross unrealized gain - After 1 to 5 years	0		98,808
Gross unrealized gain - After 5 to 10 years	0		739
Gross unrealized gains	506		113,103
Gross unrealized loss
Gross unrealized losses - Within 1 year	47,156		69
Gross unrealized losses - After 1 to 5 years	410,858		65,186
Gross unrealized losses - After 5 to 10 years	40,264		36,804
Gross unrealized losses	498,278	$ 873,000	102,059
Fair Value
Fair value - Within 1 year	4,529,477		1,239,045
Fair value - After 1 to 5 years	6,382,881		10,092,785
Fair value - After 5 to 10 years	268,590		4,527,200
Debt securities available-for-sale	$ 11,180,948		$ 15,859,030
Weighted average yield
Weighted average yield - Within 1 year	2.42%		2.33%
Weighted average yield - After 1 to 5 years	1.35%		1.18%
Weighted average yield - After 5 to 10 years	1.63%		1.22%
Weighted Average Yield	1.78%		1.27%
Obligations of U.S. Government sponsored entities
Amortized cost
Amortized cost - Within 1 year			$ 70
Amortized Cost			70
Gross unrealized gains
Gross unrealized gain - Within 1 year			0
Gross unrealized gains			0
Gross unrealized loss
Gross unrealized losses - Within 1 year			0
Gross unrealized losses			0
Fair Value
Fair value - Within 1 year			70
Debt securities available-for-sale			$ 70
Weighted average yield
Weighted average yield - Within 1 year			5.63%
Weighted Average Yield			5.63%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 3,914		$ 2,433
Amortized cost - After 5 to 10 years	47,979		43,241
Amortized cost - After 10 years	127,639		172,176
Amortized Cost	179,532		217,850
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	0		42
Gross unrealized gain - After 5 to 10 years	0		295
Gross unrealized gain - After 10 years	24		3,441
Gross unrealized gains	24		3,778
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	213		0
Gross unrealized losses - After 5 to 10 years	3,428		6
Gross unrealized losses - After 10 years	10,719		357
Gross unrealized losses	14,360		363
Fair Value
Fair value - After 1 to 5 years	3,701		2,475
Fair value - After 5 to 10 years	44,551		43,530
Fair value - After 10 years	116,944		175,260
Debt securities available-for-sale	$ 165,196		$ 221,265
Weighted average yield
Weighted average yield - After 1 to 5 years	1.77%		2.16%
Weighted average yield - After 5 to 10 years	1.73%		1.54%
Weighted average yield - After 10 years	2.53%		2.13%
Weighted Average Yield	2.30%		2.01%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year			$ 11
Amortized cost - After 1 to 5 years	$ 74,328		65,749
Amortized cost - After 5 to 10 years	866,757		665,600
Amortized cost - After 10 years	6,762,150		8,263,835
Amortized Cost	7,703,235		8,995,195
Gross unrealized gains
Gross unrealized gain - Within 1 year			1
Gross unrealized gain - After 1 to 5 years	11		2,380
Gross unrealized gain - After 5 to 10 years	43		17,998
Gross unrealized gain - After 10 years	932		68,128
Gross unrealized gains	986		88,507
Gross unrealized loss
Gross unrealized losses - Within 1 year			0
Gross unrealized losses - After 1 to 5 years	3,428		11
Gross unrealized losses - After 5 to 10 years	58,997		5
Gross unrealized losses - After 10 years	1,184,626		195,910
Gross unrealized losses	1,247,051		195,926
Fair Value
Fair value - Within 1 year			12
Fair value - After 1 to 5 years	70,911		68,118
Fair value - After 5 to 10 years	807,803		683,593
Fair value - After 10 years	5,578,456		8,136,053
Debt securities available-for-sale	$ 6,457,170		$ 8,887,776
Weighted average yield
Weighted average yield - Within 1 year			4.79%
Weighted average yield - After 1 to 5 years	2.33%		2.23%
Weighted average yield - After 5 to 10 years	2.16%		1.97%
Weighted average yield - After 10 years	1.61%		1.67%
Weighted Average Yield	1.68%		1.69%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 1,062		$ 123
Amortized Cost	1,062		123
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	0		5
Gross unrealized gains	0		5
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	2		0
Gross unrealized losses	2		0
Fair Value
Fair value - After 1 to 5 years	1,060		128
Debt securities available-for-sale	$ 1,060		$ 128
Weighted average yield
Weighted average yield - After 1 to 5 years	3.98%		3.62%
Weighted Average Yield	3.98%		3.62%

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