Debt Securities Available for Sale - Weighted average yield and contractual maturities of debt securities AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Debt securities available-for-sale, at fair value	$ 16,479,110	$ 13,300,184
Gross Unrealized Gains	163,664	30,929
Gross Unrealized Losses	36,297	209,307
Amortized Cost	16,351,743	13,478,562
Amortized cost
Amortized Cost	16,351,743	13,478,562
Gross unrealized gains
Gross unrealized gains	163,664	30,929
Gross unrealized loss
Gross unrealized losses	$ 36,297	$ 209,307
Weighted average yield
Weighted Average Yield	2.20%	2.25%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 5,593,503	$ 3,565,571
Amortized cost - After 1 to 5 years	4,200,129	4,483,741
Amortized cost - After 5 to 10 years	624,188	245,891
Amortized Cost	10,417,820	8,295,203
Gross unrealized gains
Gross unrealized gain - Within 1 year	2,924	108
Gross unrealized gain - After 1 to 5 years	86,143	13,647
Gross unrealized gain - After 5 to 10 years	1,912	3,770
Gross unrealized gains	90,979	17,525
Gross unrealized loss
Gross unrealized losses - Within 1 year	1,789	5,319
Gross unrealized losses - After 1 to 5 years	862	35,213
Gross unrealized losses - After 5 to 10 years	1,860	0
Gross unrealized losses	4,511	40,532
Fair Value
Fair value - Within 1 year	5,594,638	3,560,360
Fair value - After 1 to 5 years	4,285,410	4,462,175
Fair value - After 5 to 10 years	624,240	249,661
Fair Value	$ 10,504,288	$ 8,272,196
Weighted average yield
Weighted average yield - Within 1 year	1.88%	2.10%
Weighted average yield - After 1 to 5 years	2.34%	2.25%
Weighted average yield - After 5 to 10 years	1.60%	2.84%
Weighted Average Yield	2.05%	2.21%
Obligations of U.S. Government sponsored entities
Amortized cost
Amortized cost - Within 1 year	$ 127,485	$ 212,951
Amortized cost - After 1 to 5 years	60,005	123,857
Amortized Cost	187,490	336,808
Gross unrealized gains
Gross unrealized gain - Within 1 year	6	0
Gross unrealized gain - After 1 to 5 years	1	1
Gross unrealized gains	7	1
Gross unrealized loss
Gross unrealized losses - Within 1 year	174	1,406
Gross unrealized losses - After 1 to 5 years	231	2,094
Gross unrealized losses	405	3,500
Fair Value
Fair value - Within 1 year	127,317	211,545
Fair value - After 1 to 5 years	59,775	121,764
Fair Value	$ 187,092	$ 333,309
Weighted average yield
Weighted average yield - Within 1 year	1.40%	1.44%
Weighted average yield - After 1 to 5 years	1.48%	1.51%
Weighted Average Yield	1.43%	1.47%
Obligations of Puerto Rico, States and political subdivisions
Amortized cost
Amortized cost - Within 1 year	$ 6,975
Amortized cost - After 1 to 5 years		$ 6,926
Amortized Cost	6,975	6,926
Gross unrealized gains
Gross unrealized gain - Within 1 year	0
Gross unrealized gain - After 1 to 5 years		0
Gross unrealized gains	0	0
Gross unrealized loss
Gross unrealized losses - Within 1 year	44
Gross unrealized losses - After 1 to 5 years		184
Gross unrealized losses	44	184
Fair Value
Fair value - Within 1 year	6,931
Fair value - After 1 to 5 years		6,742
Fair Value	$ 6,931	$ 6,742
Weighted average yield
Weighted average yield - Within 1 year	0.00%
Weighted average yield - After 1 to 5 years		0.70%
Weighted Average Yield	0.00%	0.70%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 1 to 5 years	$ 725	$ 749
Amortized cost - After 5 to 10 years	91,024	115,744
Amortized cost - After 10 years	541,407	638,995
Amortized Cost	633,156	755,488
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	0	0
Gross unrealized gain - After 5 to 10 years	32	1
Gross unrealized gain - After 10 years	4,410	1,584
Gross unrealized gains	4,442	1,585
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	1	7
Gross unrealized losses - After 5 to 10 years	1,210	4,715
Gross unrealized losses - After 10 years	5,751	23,680
Gross unrealized losses	6,962	28,402
Fair Value
Fair value - After 1 to 5 years	724	742
Fair value - After 5 to 10 years	89,846	111,030
Fair value - After 10 years	540,066	616,899
Fair Value	$ 630,636	$ 728,671
Weighted average yield
Weighted average yield - After 1 to 5 years	2.02%	1.92%
Weighted average yield - After 5 to 10 years	1.64%	1.71%
Weighted average yield - After 10 years	2.09%	2.10%
Weighted Average Yield	2.02%	2.04%
Mortgage Backed Securities
Amortized cost
Amortized cost - Within 1 year	$ 37	$ 431
Amortized cost - After 1 to 5 years	39,627	6,762
Amortized cost - After 5 to 10 years	315,038	365,727
Amortized cost - After 10 years	4,751,236	3,710,731
Amortized Cost	5,105,938	4,083,651
Gross unrealized gains
Gross unrealized gain - Within 1 year	0	4
Gross unrealized gain - After 1 to 5 years	861	43
Gross unrealized gain - After 5 to 10 years	2,623	1,090
Gross unrealized gain - After 10 years	64,743	10,679
Gross unrealized gains	68,227	11,816
Gross unrealized loss
Gross unrealized losses - Within 1 year	0	0
Gross unrealized losses - After 1 to 5 years	2	1
Gross unrealized losses - After 5 to 10 years	1,391	8,499
Gross unrealized losses - After 10 years	22,982	128,189
Gross unrealized losses	24,375	136,689
Fair Value
Fair value - Within 1 year	37	435
Fair value - After 1 to 5 years	40,486	6,804
Fair value - After 5 to 10 years	316,270	358,318
Fair value - After 10 years	4,792,997	3,593,221
Fair Value	$ 5,149,790	$ 3,958,778
Weighted average yield
Weighted average yield - Within 1 year	2.05%	4.30%
Weighted average yield - After 1 to 5 years	3.35%	2.74%
Weighted average yield - After 5 to 10 years	2.04%	2.19%
Weighted average yield - After 10 years	2.61%	2.45%
Weighted Average Yield	2.58%	2.43%
Other
Amortized cost
Amortized cost - After 1 to 5 years	$ 364
Amortized cost - After 5 to 10 years		$ 486
Amortized Cost	364	486
Gross unrealized gains
Gross unrealized gain - After 1 to 5 years	9
Gross unrealized gain - After 5 to 10 years		2
Gross unrealized gains	9	2
Gross unrealized loss
Gross unrealized losses - After 1 to 5 years	0
Gross unrealized losses - After 5 to 10 years		0
Gross unrealized losses	0	0
Fair Value
Fair value - After 1 to 5 years	373
Fair value - After 5 to 10 years		488
Fair Value	$ 373	$ 488
Weighted average yield
Weighted average yield - After 1 to 5 years	3.62%
Weighted average yield - After 5 to 10 years		3.62%
Weighted Average Yield	3.62%	3.62%

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Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section II
-Paragraph B

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- References

No definition available.

+ Details

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- Definition

Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section II
-Paragraph B

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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