Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized cost
Amortized Cost	$ 24,241,078	$ 21,035,610
Gross unrealized gains
Gross unrealized gains	313,836	527,430
Gross unrealized loss
Gross unrealized losses	163,688	1,888
Fair Value
Debt Securities Available for sale, at fair value	$ 24,391,226	$ 21,561,152
Weighted average yield
Weighted Average Yield	1.44%	1.66%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 2,044,124	$ 4,900,055
Amortized cost - After 1 to 5 years	9,119,008	5,007,223
Amortized cost - After 5 to 10 years	3,290,414	567,367
Amortized Cost	14,453,546	10,474,645
Gross unrealized gains
Gross unrealized gain - Within 1 year	14,907	16,479
Gross unrealized gain - After 1 to 5 years	165,170	259,399
Gross unrealized gain - After 5 to 10 years	6,262	37,517
Gross unrealized gains	186,339	313,395
Gross unrealized loss
Gross unrealized losses - Within 1 year	2	0
Gross unrealized losses - After 1 to 5 years	10,487	0
Gross unrealized losses - After 5 to 10 years	12,447	0
Gross unrealized losses	22,936	0
Fair Value
Fair value - Within 1 year	2,059,029	4,916,534
Fair value - After 1 to 5 years	9,273,691	5,266,622
Fair value - After 5 to 10 years	3,284,229	604,884
Debt Securities Available for sale, at fair value	$ 14,616,949	$ 10,788,040
Weighted average yield
Weighted average yield - Within 1 year	1.43%	0.69%
Weighted average yield - After 1 to 5 years	1.24%	2.05%
Weighted average yield - After 5 to 10 years	1.12%	1.68%
Weighted Average Yield	1.25%	1.40%
Obligations of U.S. Government sponsored entities
Amortized cost
Amortized cost - Within 1 year	$ 70	$ 59,993
Amortized cost - After 1 to 5 years		90
Amortized Cost	70	60,083
Gross unrealized gains
Gross unrealized gain - Within 1 year	1	101
Gross unrealized gain - After 1 to 5 years		0
Gross unrealized gains	1	101
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	0
Gross unrealized losses - After 1 to 5 years		0
Gross unrealized losses	0	0
Fair Value
Fair value - Within 1 year	71	60,094
Fair value - After 1 to 5 years		90
Debt Securities Available for sale, at fair value	$ 71	$ 60,184
Weighted average yield
Weighted average yield - Within 1 year	5.63%	1.46%
Weighted average yield - After 1 to 5 years		5.64%
Weighted Average Yield	5.63%	1.47%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 527	$ 1,388
Amortized cost - After 5 to 10 years	49,410	61,229
Amortized cost - After 10 years	194,123	318,292
Amortized Cost	244,060	380,909
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	2	14
Gross unrealized gain - After 5 to 10 years	842	1,050
Gross unrealized gain - After 10 years	5,658	10,202
Gross unrealized gains	6,502	11,266
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	0	0
Gross unrealized losses - After 5 to 10 years	0	0
Gross unrealized losses - After 10 years	71	43
Gross unrealized losses	71	43
Fair Value
Fair value - After 1 to 5 years	529	1,402
Fair value - After 5 to 10 years	50,252	62,279
Fair value - After 10 years	199,710	328,451
Debt Securities Available for sale, at fair value	$ 250,491	$ 392,132
Weighted average yield
Weighted average yield - After 1 to 5 years	2.52%	2.97%
Weighted average yield - After 5 to 10 years	1.58%	1.56%
Weighted average yield - After 10 years	2.10%	2.04%
Weighted Average Yield	2.00%	1.97%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 5,513	$ 5,616
Amortized cost - After 1 to 5 years	55,423	50,393
Amortized cost - After 5 to 10 years	667,142	454,880
Amortized cost - After 10 years	8,815,176	9,608,860
Amortized Cost	9,543,254	10,119,749
Gross unrealized gains
Gross unrealized gain - Within 1 year	1	56
Gross unrealized gain - After 1 to 5 years	2,549	1,735
Gross unrealized gain - After 5 to 10 years	22,843	20,022
Gross unrealized gain - After 10 years	95,593	180,844
Gross unrealized gains	120,986	202,657
Gross unrealized loss
Gross unrealized losses - Within 1 year	1	0
Gross unrealized losses - After 1 to 5 years	9	0
Gross unrealized losses - After 5 to 10 years	4	6
Gross unrealized losses - After 10 years	140,667	1,839
Gross unrealized losses	140,681	1,845
Fair Value
Fair value - Within 1 year	5,513	5,672
Fair value - After 1 to 5 years	57,963	52,128
Fair value - After 5 to 10 years	689,981	474,896
Fair value - After 10 years	8,770,102	9,787,865
Debt Securities Available for sale, at fair value	$ 9,523,559	$ 10,320,561
Weighted average yield
Weighted average yield - Within 1 year	1.98%	2.83%
Weighted average yield - After 1 to 5 years	2.35%	2.35%
Weighted average yield - After 5 to 10 years	1.92%	1.91%
Weighted average yield - After 10 years	1.72%	1.94%
Weighted Average Yield	1.74%	1.94%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 148	$ 224
Amortized Cost	148	224
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	8	11
Gross unrealized gains	8	11
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	0	0
Gross unrealized losses	0	0
Fair Value
Fair value - After 1 to 5 years	156	235
Debt Securities Available for sale, at fair value	$ 156	$ 235
Weighted average yield
Weighted average yield - After 1 to 5 years	3.62%	3.62%
Weighted Average Yield	3.62%	3.62%

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