LOAN PORTFOLIO - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Feb. 27, 2015	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Interest Income Impaired Loans				$ 7,600,000
Interest Income on Impaired Loans Accrual Basis		8,237,000		5,900,000
Contractually outstanding principal and interest at acquisition		226,700,000			135,500,000
Securitization of mortgage loans into mortgage backed securities		46,900,000
Total gross loans held for investment portfolio		9,485,372,000		9,566,785,000	9,262,436,000
Outstanding of credit facilities granted					308,000,000
Loans to local financial institutions collateralized by real estate mortgages		0			0
Total TDR loans		705,123,000	[1]	622,320,000	694,453,000	[2]
Outstanding unfunded commitments on TDR loans		47,000
Provsion of PCI Loans		0
Loans held for sale		81,723,000			76,956,000
Non Sop Unpaid Principal Balance		227,900,000
Proceeds From Sale Of Loans Held For Investment		2,230,000		16,558,000
Discount On Loans Acquired Percentage	9.00%
Discount On Loans Acquired Amount	29,000,000
Puerto Rico Government and Political Subdivisions [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		201,300,000
Public Corporations [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		95,900,000
Government [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		24,500,000
Puerto Rico Tourism Development Fund [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		132,500,000			133,300,000
Puerto Rico Electric PowerAuthority [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		75,000,000
GNMA
Accounts Notes And Loans Receivable [Line Items]
Loans repurchased		3,000,000
FNMA and FHLMC
Accounts Notes And Loans Receivable [Line Items]
Loans repurchased		200,000
Government Guaranteed Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Significant Sales		38,400,000
Total TDR loans		65,700,000
Loans in trial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		11,500,000
Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		270,924,000	[3],[4]		199,813,000	[5],[6]
Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale					45,700,000
Loans Split [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		42,907,000		78,833,000
Non Fha Va Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Significant Purchases		23,800,000
Total TDR loans		354,094,000			349,775,000
Commercial And Industrial Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		166,736,000			171,926,000
Payments To Acquire Loans Held For Investment		21,100,000
Commercial Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		136,780,000			127,766,000
Commercial Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		0			0
Residential Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		10,060,000			10,037,000
Land Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		2,477,000			2,470,000
Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Total gross loans held for investment portfolio		3,331,620,000		2,548,101,000
Troubled Debt Restructurings [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for sale		45,700,000
Loans Split [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing receivable loans restructured recorded investment accruals		41,200,000
Non Fha Va Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		354,094,000			349,775,000
Non Fha Va Residential Mortgage Loans [Member] | Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		80,204,000	[3],[4]		82,965,000	[5],[6]
Commercial And Industrial Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		1,968,000
Total TDR loans		166,736,000			171,926,000
Classified and non-performing loans sold		3,500,000
Commercial And Industrial Loan [Member] | Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		111,342,000	[3],[4]		40,382,000	[5],[6]
Commercial Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		881,000
Total TDR loans		136,780,000			127,766,000
Commercial Mortgage Loans [Member] | Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		61,239,000	[3],[4]		58,392,000	[5],[6]
Construction Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total gross loans held for investment portfolio		124,440,000		152,579,000
Total TDR loans		12,500,000
Consumer Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Total gross loans held for investment portfolio		1,937,182,000		2,072,252,000
Total TDR loans		35,000,000
Commercial Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		128,000
Total TDR loans		0			0
Commercial Construction [Member] | Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		0	[3],[4]		0	[5],[6]
Residential Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		44,000
Total TDR loans		10,060,000			10,037,000
Residential Construction [Member] | Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		6,588,000	[3],[4]		6,589,000	[5],[6]
Land Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		15,000
Total TDR loans		2,477,000			2,470,000
Land Construction [Member] | Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		1,698,000	[3],[4]		1,636,000	[5],[6]
In Process Of Foreclosure [Member]
Accounts Notes And Loans Receivable [Line Items]
Recorded Investment Amount In Consumer Mortgage Loans Collateralized By Residential Real Estate Property		161,100,000
P R
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		83.00%
Outstanding of credit facilities granted		321,700,000
Line of credit facility provided to fund unfunded commitments		335,700,000
V I
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		6.00%
Outstanding of credit facilities granted		61,000,000			57,700,000
U S
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		11.00%
Credit Impaired Loans [Member] | Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage		32,000,000
Credit Impaired Loans [Member] | Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage					16,600,000
Credit Impaired Loans [Member] | Commercial Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Recorded Investment 30 To 59 Days Past Due Mortgage		$ 300,000			$ 8,800,000

[1] Excludes TDRs held for sale amounting to $45.7 million as of March 31, 2015.

[2] Excludes TDRs held for sale amounting to $45.7 million as of December 31, 2014.

[3] Included in non-accrual loans are $121.9 million in loans that are performing under the terms of a restructuring agreement but are reported in non-accrual status until the restructured loans meet the criteria of sustained payment performance under the revised terms for reinstatement to accrual status and there is no doubt about full collectability.

[4] Excludes non-accrual TDRs held for sale with a carrying value of $45.7 million as of March 31, 2015.

[5] Included in non-accrual loans are $52.8 million in loans that are performing under the terms of a restructuring agreement but are reported in non-accrual status until the restructured loans meet the criteria of sustained payment performance under the revised terms for reinstatement to accrual status and there is no doubt about full collectability.

[6] Excludes non-accrual TDRs held for sale with a carrying value of $45.7 million as of December 31, 2014.