Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized cost
Amortized Cost	$ 20,621,806	$ 17,542,125
Gross unrealized gains
Gross unrealized gains	561,389	146,165
Gross unrealized loss
Gross unrealized losses	5,356	39,817
Fair Value
Debt Securities Available for Sale, at Fair Value	$ 21,177,839	$ 17,648,473
Weighted average yield
Weighted Average Yield	1.66%	2.05%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 5,379,791	$ 5,071,201
Amortized cost - After 1 to 5 years	5,029,655	5,137,804
Amortized cost - After 5 to 10 years	886,769	1,778,568
Amortized Cost	11,296,215	11,987,573
Gross unrealized gains
Gross unrealized gain - Within 1 year	16,184	3,262
Gross unrealized gain - After 1 to 5 years	270,498	75,597
Gross unrealized gain - After 5 to 10 years	64,694	429
Gross unrealized gains	351,376	79,288
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	567
Gross unrealized losses - After 1 to 5 years	0	3,435
Gross unrealized losses - After 5 to 10 years	0	6,604
Gross unrealized losses	0	10,606
Fair Value
Fair value - Within 1 year	5,395,975	5,073,896
Fair value - After 1 to 5 years	5,300,153	5,209,966
Fair value - After 5 to 10 years	951,463	1,772,393
Debt Securities Available for Sale, at Fair Value	$ 11,647,591	$ 12,056,255
Weighted average yield
Weighted average yield - Within 1 year	0.65%	1.58%
Weighted average yield - After 1 to 5 years	2.09%	2.19%
Weighted average yield - After 5 to 10 years	1.72%	1.70%
Weighted Average Yield	1.37%	1.86%
Obligations of U.S. Government sponsored entities
Amortized cost
Amortized cost - Within 1 year	$ 59,977	$ 62,492
Amortized cost - After 1 to 5 years	90	60,021
Amortized Cost	60,067	122,513
Gross unrealized gains
Gross unrealized gain - Within 1 year	302	2
Gross unrealized gain - After 1 to 5 years	2	0
Gross unrealized gains	304	2
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	21
Gross unrealized losses - After 1 to 5 years	0	90
Gross unrealized losses	0	111
Fair Value
Fair value - Within 1 year	60,279	62,473
Fair value - After 1 to 5 years	92	59,931
Debt Securities Available for Sale, at Fair Value	$ 60,371	$ 122,404
Weighted average yield
Weighted average yield - Within 1 year	1.47%	1.45%
Weighted average yield - After 1 to 5 years	5.63%	1.48%
Weighted Average Yield	1.48%	1.47%
Obligations of Puerto Rico, States and political subdivisions
Amortized cost
Amortized cost - Within 1 year		$ 6,975
Amortized Cost		6,975
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		6,975
Debt Securities Available for Sale, at Fair Value		$ 6,975
Weighted average yield
Weighted average yield - Within 1 year		0.00%
Weighted Average Yield		0.00%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - Within 1 year	$ 20	$ 236
Amortized cost - After 1 to 5 years	239	350
Amortized cost - After 5 to 10 years	69,780	85,079
Amortized cost - After 10 years	367,974	504,391
Amortized Cost	438,013	590,056
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	0
Gross unrealized gain - After 1 to 5 years	3	1
Gross unrealized gain - After 5 to 10 years	1,184	31
Gross unrealized gain - After 10 years	11,167	3,640
Gross unrealized gains	12,354	3,672
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	0
Gross unrealized losses - After 1 to 5 years	0	0
Gross unrealized losses - After 5 to 10 years	0	1,180
Gross unrealized losses - After 10 years	61	6,373
Gross unrealized losses	61	7,553
Fair Value
Fair value - Within 1 year	20	236
Fair value - After 1 to 5 years	242	351
Fair value - After 5 to 10 years	70,964	83,930
Fair value - After 10 years	379,080	501,658
Debt Securities Available for Sale, at Fair Value	$ 450,306	$ 586,175
Weighted average yield
Weighted average yield - Within 1 year	1.37%	1.83%
Weighted average yield - After 1 to 5 years	2.16%	2.16%
Weighted average yield - After 5 to 10 years	1.62%	1.63%
Weighted average yield - After 10 years	2.03%	2.08%
Weighted Average Yield	1.98%	2.02%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year		$ 16
Amortized cost - After 1 to 5 years	$ 63,157	36,717
Amortized cost - After 5 to 10 years	389,976	350,373
Amortized cost - After 10 years	8,374,132	4,447,561
Amortized Cost	8,827,265	4,834,667
Gross unrealized gains
Gross unrealized gain - Within 1 year		0
Gross unrealized gain - After 1 to 5 years	2,071	852
Gross unrealized gain - After 5 to 10 years	16,636	1,958
Gross unrealized gain - After 10 years	178,637	60,384
Gross unrealized gains	197,344	63,194
Gross unrealized loss
Gross unrealized losses - Within 1 year		0
Gross unrealized losses - After 1 to 5 years	8	1
Gross unrealized losses - After 5 to 10 years	15	1,303
Gross unrealized losses - After 10 years	5,272	20,243
Gross unrealized losses	5,295	21,547
Fair Value
Fair value - Within 1 year		16
Fair value - After 1 to 5 years	65,220	37,568
Fair value - After 5 to 10 years	406,597	351,028
Fair value - After 10 years	8,547,497	4,487,702
Debt Securities Available for Sale, at Fair Value	$ 9,019,314	$ 4,876,314
Weighted average yield
Weighted average yield - Within 1 year		2.13%
Weighted average yield - After 1 to 5 years	2.39%	3.38%
Weighted average yield - After 5 to 10 years	1.86%	2.02%
Weighted average yield - After 10 years	2.05%	2.60%
Weighted Average Yield	2.05%	2.57%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 246	$ 341
Amortized Cost	246	341
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	11	9
Gross unrealized gains	11	9
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	257	350
Debt Securities Available for Sale, at Fair Value	$ 257	$ 350
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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