Note Business Combination (Fair values of major classes of identifiable assets acquired and liabilities assumed - Recasted) (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Feb. 27, 2015	Dec. 31, 2014
Business Acquisition
Goodwill		$ 631,095	$ 626,388	$ 508,310		$ 465,676
FDIC Assisted Partial Acquisition Of Doral Bank | As recasted
Business Acquisition
Goodwill	[1]				$ 167,804
FDIC Assisted Partial Acquisition Of Doral Bank | As previously reported
Business Acquisition
Goodwill	[2]				41,633
Core deposits intangibles	[2]				23,572
Other assets	[2]				626,177
Total assets	[2]				2,798,859
Total liabilities	[2]				2,798,859
FDIC Assisted Partial Acquisition Of Doral Bank | Loans
Business Acquisition
Change					(151,889)
FDIC Assisted Partial Acquisition Of Doral Bank | Loans | As recasted
Business Acquisition
Receivables	[1]				1,513,867
FDIC Assisted Partial Acquisition Of Doral Bank | Loans | As previously reported
Business Acquisition
Receivables	[2]				1,665,756
FDIC Assisted Partial Acquisition Of Doral Bank | Goodwill
Business Acquisition
Change					126,171
FDIC Assisted Partial Acquisition Of Doral Bank | Receivable from the FDIC
Business Acquisition
Change					38,416
FDIC Assisted Partial Acquisition Of Doral Bank | Receivable from the FDIC | As recasted
Business Acquisition
Receivables	[1]				480,137
FDIC Assisted Partial Acquisition Of Doral Bank | Receivable from the FDIC | As previously reported
Business Acquisition
Receivables	[2]				441,721
FDIC Assisted Partial Acquisition Of Doral Bank | Core deposits
Business Acquisition
Change					(10,762)
FDIC Assisted Partial Acquisition Of Doral Bank | Core deposits | As recasted
Business Acquisition
Core deposits intangibles	[1]				12,810
FDIC Assisted Partial Acquisition Of Doral Bank | Other assets
Business Acquisition
Change					0
FDIC Assisted Partial Acquisition Of Doral Bank | Other assets | As recasted
Business Acquisition
Other assets	[1]				626,177
FDIC Assisted Partial Acquisition Of Doral Bank | Total assets
Business Acquisition
Change					1,936
FDIC Assisted Partial Acquisition Of Doral Bank | Total assets | As recasted
Business Acquisition
Total assets	[1]				2,800,795
FDIC Assisted Partial Acquisition Of Doral Bank | Deposits
Business Acquisition
Change					1,936
FDIC Assisted Partial Acquisition Of Doral Bank | Deposits | As recasted
Business Acquisition
Liabilities	[1]				2,203,391
FDIC Assisted Partial Acquisition Of Doral Bank | Deposits | As previously reported
Business Acquisition
Liabilities	[2]				2,201,455
FDIC Assisted Partial Acquisition Of Doral Bank | Advances from the Federal Home Loan Bank
Business Acquisition
Change					0
FDIC Assisted Partial Acquisition Of Doral Bank | Advances from the Federal Home Loan Bank | As recasted
Business Acquisition
Liabilities	[1]				547,187
FDIC Assisted Partial Acquisition Of Doral Bank | Advances from the Federal Home Loan Bank | As previously reported
Business Acquisition
Liabilities	[2]				547,187
FDIC Assisted Partial Acquisition Of Doral Bank | Other liabilities
Business Acquisition
Change					0
FDIC Assisted Partial Acquisition Of Doral Bank | Other liabilities | As recasted
Business Acquisition
Liabilities	[1]				50,217
FDIC Assisted Partial Acquisition Of Doral Bank | Other liabilities | As previously reported
Business Acquisition
Liabilities	[2]				50,217
FDIC Assisted Partial Acquisition Of Doral Bank | Total liabilities
Business Acquisition
Change					1,936
FDIC Assisted Partial Acquisition Of Doral Bank | Total liabilities | As recasted
Business Acquisition
Total liabilities	[1]				$ 2,800,795

[1] Amounts reported include retrospective adjustments during the measurement period, in accordance with U.S. GAAP, related to the Doral Bank Transaction.

[2] Amounts are presented as previously reported in the Form 10-Q as of September 30, 2015.