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Deposits and Related Interest (Narratives) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Weighted Average Rate Domestic Deposit	0.62%	0.65%
Time Deposits, $250,000 or More	$ 352.5	$ 359.6
Public Fund Time Deposits, $250,000 or more	$ 2.3	$ 3.5
Public Fund Time Deposits Weighted Average Rate, $250,000 or more	0.30%	0.28%
Public funds deposit	$ 127.3	$ 153.1
Public Fund Collateral Investments	172.0	173.0
Accrued Interest, Time Deposits	1.7
Bank Overdrafts	1.1	2.2
Brokered Certificates of Deposits	428.8	471.6
Brokered Money Market Deposit	$ 45.8	$ 46.9

X

- Definition

Brokered certificates of deposits included in non-core deposits.

+ References

No definition available.

+ Details

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X

- Definition

Investments pledged as collateral to secure PR public fund deposits.

+ References

No definition available.

+ Details

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X

- Definition

Balance of Puerto Rico public fund deposits of $250,000 or more in the deposits portfolio.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average interest rate of PR public fund deposits of $250,000 or more.

+ References

No definition available.

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X

- Definition

Public funds deposits are derived from a variety of political subdivisions such as municipalities

+ References

No definition available.

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X

- Definition

Carrying value as of the balance sheet date of payments made in excess of existing cash balances, which will be honored by the bank but reflected as a loan to the entity. Overdrafts generally have a very short time frame for correction or repayment and are therefore more similar to short-term bank financing than trade financing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Liabilities
-URI http://asc.fasb.org/extlink&oid=6509677

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1243-112600

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X

- Definition

Amount of accrued but unpaid interest on deposit liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- References

No definition available.

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- Definition

Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

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- Definition

The weighted average interest rate for all domestic deposit liabilities.

+ References

No definition available.

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