Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Amortized cost
Amortized Cost	$ 15,259,832	$ 17,542,125
Gross unrealized gains
Gross unrealized gains	555,852	146,165
Gross unrealized loss
Gross unrealized losses	2,383	39,817
Fair Value
Debt Securities Available for Sale, at Fair Value	$ 15,813,301	$ 17,648,473
Weighted average yield
Weighted Average Yield	2.04%	2.05%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 3,401,265	$ 5,071,201
Amortized cost - After 1 to 5 years	5,109,362	5,137,804
Amortized cost - After 5 to 10 years	1,516,770	1,778,568
Amortized Cost	10,027,397	11,987,573
Gross unrealized gains
Gross unrealized gain - Within 1 year	16,188	3,262
Gross unrealized gain - After 1 to 5 years	271,488	75,597
Gross unrealized gain - After 5 to 10 years	102,440	429
Gross unrealized gains	390,116	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	3,417,453	5,073,896
Fair value - After 1 to 5 years	5,380,850	5,209,966
Fair value - After 5 to 10 years	1,619,210	1,772,393
Debt Securities Available for Sale, at Fair Value	$ 10,417,513	$ 12,056,255
Weighted average yield
Weighted average yield - Within 1 year	1.50%	1.58%
Weighted average yield - After 1 to 5 years	2.16%	2.19%
Weighted average yield - After 5 to 10 years	1.70%	1.70%
Weighted Average Yield	1.87%	1.86%
Obligations of U.S. Government sponsored entities
Amortized cost
Amortized cost - Within 1 year	$ 85,638	$ 62,492
Amortized cost - After 1 to 5 years	90	60,021
Amortized Cost	85,728	122,513
Gross unrealized gains
Gross unrealized gain - Within 1 year	606	2
Gross unrealized gain - After 1 to 5 years	2	0
Gross unrealized gains	608	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	86,244	62,473
Fair value - After 1 to 5 years	92	59,931
Debt Securities Available for Sale, at Fair Value	$ 86,336	$ 122,404
Weighted average yield
Weighted average yield - Within 1 year	1.48%	1.45%
Weighted average yield - After 1 to 5 years	5.64%	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	$ 156	$ 236
Amortized cost - After 1 to 5 years	1,009	350
Amortized cost - After 5 to 10 years	79,853	85,079
Amortized cost - After 10 years	469,095	504,391
Amortized Cost	550,113	590,056
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	0
Gross unrealized gain - After 1 to 5 years	8	1
Gross unrealized gain - After 5 to 10 years	1,066	31
Gross unrealized gain - After 10 years	11,263	3,640
Gross unrealized gains	12,337	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	1,614	6,373
Gross unrealized losses	1,614	7,553
Fair Value
Fair value - Within 1 year	156	236
Fair value - After 1 to 5 years	1,017	351
Fair value - After 5 to 10 years	80,919	83,930
Fair value - After 10 years	478,744	501,658
Debt Securities Available for Sale, at Fair Value	$ 560,836	$ 586,175
Weighted average yield
Weighted average yield - Within 1 year	1.77%	1.83%
Weighted average yield - After 1 to 5 years	2.55%	2.16%
Weighted average yield - After 5 to 10 years	1.61%	1.63%
Weighted average yield - After 10 years	2.06%	2.08%
Weighted Average Yield	1.99%	2.02%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 17	$ 16
Amortized cost - After 1 to 5 years	39,494	36,717
Amortized cost - After 5 to 10 years	349,654	350,373
Amortized cost - After 10 years	4,207,124	4,447,561
Amortized Cost	4,596,289	4,834,667
Gross unrealized gains
Gross unrealized gain - Within 1 year	1	0
Gross unrealized gain - After 1 to 5 years	1,299	852
Gross unrealized gain - After 5 to 10 years	9,573	1,958
Gross unrealized gain - After 10 years	141,907	60,384
Gross unrealized gains	152,780	63,194
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	0
Gross unrealized losses - After 1 to 5 years	15	1
Gross unrealized losses - After 5 to 10 years	21	1,303
Gross unrealized losses - After 10 years	733	20,243
Gross unrealized losses	769	21,547
Fair Value
Fair value - Within 1 year	18	16
Fair value - After 1 to 5 years	40,778	37,568
Fair value - After 5 to 10 years	359,206	351,028
Fair value - After 10 years	4,348,298	4,487,702
Debt Securities Available for Sale, at Fair Value	$ 4,748,300	$ 4,876,314
Weighted average yield
Weighted average yield - Within 1 year	2.18%	2.13%
Weighted average yield - After 1 to 5 years	3.12%	3.38%
Weighted average yield - After 5 to 10 years	1.47%	2.02%
Weighted average yield - After 10 years	2.52%	2.60%
Weighted Average Yield	2.45%	2.57%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 305	$ 341
Amortized Cost	305	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	316	350
Debt Securities Available for Sale, at Fair Value	$ 316	$ 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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