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Investment Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position	$ 849,800
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position	$ 4,700
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position	99.50%
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position	0.50%
Maximum GovernmentBond Probability Of Default	6.40%
Money market investments	$ 6,685		$ 5,606
Securitized GNMA pools, amortized cost	$ 25,000	$ 23,000
Securitized GNMA pool, yield	3.14%	3.06%
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Book Value		$ 283,176
Gain (Loss) on Sale of Securities, Net	$ 0	11,996
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held	0	0	$ 0		$ 1,490
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value	4,200
Government Investment with Default Probability Payment Received	$ 2,200			$ 2,000
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Book Value		283,176
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Book Value		272,081
Collateralized Mortgage Backed Securities [Member] | Obligations of Puerto Rico Government and Public Instrumentalities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Book Value		$ 11,095

X

- Definition

This item represents the book value at the sale of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Payment Received from government agencie bond with default probability

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Investments Guaranteed By Puerto Rico Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value

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Investments in Unrealized Loss on Positions Guaranteed by Puerto Rico Government and its political subdivisions subject to credit risk and decline on market value due to puerto Rico Government market conditions.

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Investments guaranteed by Puerto Rico Government and its political subdivisions in unrealized loss position percentage to total investment in unrealized loss position

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Investments in unrealized loss on positions guaranteed by US Treasury and sponsored agencies which are not subject to credit risk due to market conditions.

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Investments guaranteed by US Treasury and sponsored agencies in unrealized loss position percentage to total investment in unrealized loss position

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Maximum percentage amount of likelihood a government bond will not be repaid and instead default.

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Yield or cost of retained securitzed GNMA pools from its own origination.

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Loan pools securitized by GNMA at amortized cost.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563

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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.

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