Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized cost
Amortized Cost	$ 22,129,856	$ 21,035,610
Gross unrealized gains
Gross unrealized gains	352,718	527,430
Gross unrealized loss
Gross unrealized losses	147,407	1,888
Fair Value
Debt Securities Available for sale, at fair value	$ 22,335,167	$ 21,561,152
Weighted average yield
Weighted Average Yield	1.62%	1.66%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 1,723,731	$ 4,900,055
Amortized cost - After 1 to 5 years	6,291,688	5,007,223
Amortized cost - After 5 to 10 years	3,758,768	567,367
Amortized Cost	11,774,187	10,474,645
Gross unrealized gains
Gross unrealized gain - Within 1 year	15,416	16,479
Gross unrealized gain - After 1 to 5 years	192,969	259,399
Gross unrealized gain - After 5 to 10 years	12,635	37,517
Gross unrealized gains	221,020	313,395
Gross unrealized loss
Gross unrealized losses - Within 1 year	1	0
Gross unrealized losses - After 1 to 5 years	7,302	0
Gross unrealized losses - After 5 to 10 years	8,590	0
Gross unrealized losses	15,893	0
Fair Value
Fair value - Within 1 year	1,739,146	4,916,534
Fair value - After 1 to 5 years	6,477,355	5,266,622
Fair value - After 5 to 10 years	3,762,813	604,884
Debt Securities Available for sale, at fair value	$ 11,979,314	$ 10,788,040
Weighted average yield
Weighted average yield - Within 1 year	1.78%	0.69%
Weighted average yield - After 1 to 5 years	1.64%	2.05%
Weighted average yield - After 5 to 10 years	1.09%	1.68%
Weighted Average Yield	1.49%	1.40%
Obligations of U.S. Government sponsored entities
Amortized cost
Amortized cost - Within 1 year		$ 59,993
Amortized cost - After 1 to 5 years	$ 90	90
Amortized Cost	90	60,083
Gross unrealized gains
Gross unrealized gain - Within 1 year		101
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gains	0	101
Gross unrealized loss
Gross unrealized losses - Within 1 year		0
Gross unrealized losses - After 1 to 5 years	0	0
Gross unrealized losses	0	0
Fair Value
Fair value - Within 1 year		60,094
Fair value - After 1 to 5 years	90	90
Debt Securities Available for sale, at fair value	$ 90	$ 60,184
Weighted average yield
Weighted average yield - Within 1 year		1.46%
Weighted average yield - After 1 to 5 years	5.63%	5.64%
Weighted Average Yield	5.63%	1.47%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 858	$ 1,388
Amortized cost - After 5 to 10 years	50,612	61,229
Amortized cost - After 10 years	223,593	318,292
Amortized Cost	275,063	380,909
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	7	14
Gross unrealized gain - After 5 to 10 years	947	1,050
Gross unrealized gain - After 10 years	6,926	10,202
Gross unrealized gains	7,880	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	21	43
Gross unrealized losses	21	43
Fair Value
Fair value - After 1 to 5 years	865	1,402
Fair value - After 5 to 10 years	51,559	62,279
Fair value - After 10 years	230,498	328,451
Debt Securities Available for sale, at fair value	$ 282,922	$ 392,132
Weighted average yield
Weighted average yield - After 1 to 5 years	2.78%	2.97%
Weighted average yield - After 5 to 10 years	1.57%	1.56%
Weighted average yield - After 10 years	2.08%	2.04%
Weighted Average Yield	1.99%	1.97%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 5,543	$ 5,616
Amortized cost - After 1 to 5 years	58,649	50,393
Amortized cost - After 5 to 10 years	625,776	454,880
Amortized cost - After 10 years	9,390,381	9,608,860
Amortized Cost	10,080,349	10,119,749
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	56
Gross unrealized gain - After 1 to 5 years	2,799	1,735
Gross unrealized gain - After 5 to 10 years	21,805	20,022
Gross unrealized gain - After 10 years	99,205	180,844
Gross unrealized gains	123,809	202,657
Gross unrealized loss
Gross unrealized losses - Within 1 year	1	0
Gross unrealized losses - After 1 to 5 years	11	0
Gross unrealized losses - After 5 to 10 years	4	6
Gross unrealized losses - After 10 years	131,477	1,839
Gross unrealized losses	131,493	1,845
Fair Value
Fair value - Within 1 year	5,542	5,672
Fair value - After 1 to 5 years	61,437	52,128
Fair value - After 5 to 10 years	647,577	474,896
Fair value - After 10 years	9,358,109	9,787,865
Debt Securities Available for sale, at fair value	$ 10,072,665	$ 10,320,561
Weighted average yield
Weighted average yield - Within 1 year	2.71%	2.83%
Weighted average yield - After 1 to 5 years	2.38%	2.35%
Weighted average yield - After 5 to 10 years	1.90%	1.91%
Weighted average yield - After 10 years	1.78%	1.94%
Weighted Average Yield	1.78%	1.94%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 167	$ 224
Amortized Cost	167	224
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	9	11
Gross unrealized gains	9	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	176	235
Debt Securities Available for sale, at fair value	$ 176	$ 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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