LOAN PORTFOLIO - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			12 Months Ended
	May. 31, 2016	Mar. 31, 2016		Mar. 31, 2015	Dec. 31, 2015		Jun. 30, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Interest Income Impaired Loans				$ 9,700
Interest Income on Impaired Loans Accrual Basis		$ 6,607		8,200
Contractually outstanding principal and interest at acquisition		216,100			$ 218,100
Financing Receivable Significant Purchases		19,100
Securitization of mortgage loans into mortgage backed securities		67,700
Total gross loans held for investment portfolio		9,131,342		9,485,372	9,273,865
Outstanding of credit facilities granted					314,600
Loans to local financial institutions collateralized by real estate mortgages		0			0
Total TDR loans		659,104		705,123	661,591			$ 694,453
Outstanding unfunded commitments on TDR loans		300
Provsion of PCI Loans		606		0
Loans held for sale		37,868			35,869
Proceeds From Sale Of Loans Held For Investment		0		2,230
Government Guaranteed Residential Mortgage Loans Indirect Exposure		124,300
Puerto Rico Housing Finance Authority Restricted Net Position							$ 77,400
Threshold Mortgage Loans Principal Amount Puerto Rico Housing Financing Authority		$ 75,000					$ 552,000
Principal Payment Defaulted Government	$ 367,000
Notes Exchanged Local Credit Unions	$ 33,000
Reserve Coverage Ratio		20.00%
Puerto Rico Government and Political Subdivisions [Member]
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		88.00%
Outstanding of credit facilities granted		$ 199,300
Public Corporations [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		96,000
Financing Receivable Commercial Governments Book Value		91,000
Government [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		6,900
Puerto Rico Tourism Development Fund [Member]
Accounts Notes And Loans Receivable [Line Items]
Outstanding of credit facilities granted		128,600			129,400
Financing Receivable Commercial Governments Collections		600			5,300
Puerto Rico Electric PowerAuthority [Member]
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Commercial Governments Book Value		69,700
GNMA
Accounts Notes And Loans Receivable [Line Items]
Loans repurchased		8,400		3,000
FNMA and FHLMC
Accounts Notes And Loans Receivable [Line Items]
Financing Receivable Significant Sales		38,300
Loans repurchased		500		200
Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Total gross loans held for investment portfolio		3,330,945		3,331,620
Government Guaranteed Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		74,200			77,600
Loans in trial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		7,200
Non Accrual [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		245,671	[1]		246,683	[2]
Loans Split [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		38,628			42,907
Financing receivable loans restructured recorded investment accruals		38,500
Non Fha Va Residential Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total TDR loans		384,335			382,672
Commercial And Industrial Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		535
Total TDR loans		144,828			150,254
Commercial Mortgage Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		340
Total TDR loans		43,469			44,498
Construction Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Total gross loans held for investment portfolio		146,129		124,440
Total TDR loans		45,200
Consumer Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Total gross loans held for investment portfolio		1,786,361		$ 1,937,182
Total TDR loans		41,300
Commercial Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		0
Total TDR loans		39,037			39,466
Residential Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		42
Total TDR loans		3,388			3,482
Land Construction [Member]
Accounts Notes And Loans Receivable [Line Items]
Interest Income on Impaired Loans Accrual Basis		9
Total TDR loans		2,755			2,766
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		$ 153,500
P R
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		80.00%
Outstanding of credit facilities granted		$ 302,200
Line of credit facility provided to fund unfunded commitments		315,600
Financing Receivable Commercial Governments Book Value		$ 297,200
V I
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		7.00%
Outstanding of credit facilities granted		$ 67,400			126,200
U S
Accounts Notes And Loans Receivable [Line Items]
Credit risk concentration		13.00%
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		$ 23,500			$ 23,600

[1] Included in non-accrual loans are $119.2 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.

[2] Included in non-accrual loans are $118.2 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.