Credit quality indicators of non-covered loans held-in-portfolio based obligor risk ratings (Detail) (USD $)	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	$ 19,082,387,000		$ 24,951,299,000		$ 25,406,339,000
Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	12,299,943,000		12,486,069,000		13,110,415,000
Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			786,765,000		911,070,000
Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			6,691,414,000		6,143,158,000
Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			648,409,000		898,772,000
Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			548,706,000		565,881,000
Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,741,578,000		3,789,936,000		3,777,043,000
Non Covered Loans [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,634,920,000		3,673,755,000
Non Covered Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,009,556,000		981,730,000
Non Covered Loans [Member] | Watch [Member] | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	71,868,000		71,755,000
Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	329,126,000		369,603,000
Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	212,569,000		222,484,000
Non Covered Loans [Member] | Watch [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	354,783,000		278,208,000
Non Covered Loans [Member] | Watch [Member] | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	968,346,000		942,050,000
Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	4,072,000		5,447,000
Non Covered Loans [Member] | Watch [Member] | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Watch [Member] | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	37,138,000		34,233,000
Non Covered Loans [Member] | Watch [Member] | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Watch [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Special Mention Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	763,021,000		790,948,000
Non Covered Loans [Member] | Special Mention Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	11,236,000		8,928,000
Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	178,471,000		182,351,000
Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	202,245,000		213,450,000
Non Covered Loans [Member] | Special Mention Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	301,285,000		309,066,000
Non Covered Loans [Member] | Special Mention Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	693,237,000		713,795,000
Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	31,886,000		38,429,000
Non Covered Loans [Member] | Special Mention Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Special Mention Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	37,898,000		38,724,000
Non Covered Loans [Member] | Special Mention Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Special Mention Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Substandard Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,875,750,000		2,889,823,000
Non Covered Loans [Member] | Substandard Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	91,467,000		81,248,000
Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	453,514,000		441,862,000
Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	820,207,000		827,279,000
Non Covered Loans [Member] | Substandard Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	567,120,000		542,460,000
Non Covered Loans [Member] | Substandard Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,932,308,000		1,892,849,000
Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	100,725,000		123,658,000
Non Covered Loans [Member] | Substandard Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	644,445,000		664,007,000
Non Covered Loans [Member] | Substandard Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	141,124,000		148,629,000
Non Covered Loans [Member] | Substandard Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,385,000		1,365,000
Non Covered Loans [Member] | Substandard Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	53,763,000		59,315,000
Non Covered Loans [Member] | Doubtful Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	10,897,000		12,429,000
Non Covered Loans [Member] | Doubtful Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,802,000		2,886,000
Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,560,000		4,631,000
Non Covered Loans [Member] | Doubtful Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,223,000		3,326,000
Non Covered Loans [Member] | Doubtful Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	9,585,000		10,843,000
Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,312,000		1,586,000
Non Covered Loans [Member] | Doubtful Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Doubtful Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Doubtful Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Doubtful Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	15,211,000		16,461,000
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,084,000		1,458,000
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,084,000		1,458,000
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,289,000		4,277,000
Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	11,838,000		10,726,000
Non Covered Loans [Member] | Pass Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	15,804,239,000		15,911,205,000
Non Covered Loans [Member] | Pass Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	627,715,000		647,002,000
Non Covered Loans [Member] | Pass Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,677,448,000		1,668,797,000
Non Covered Loans [Member] | Pass Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,426,970,000		1,549,422,000
Non Covered Loans [Member] | Pass Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,531,549,000		2,547,111,000
Non Covered Loans [Member] | Pass Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	6,263,682,000		6,412,332,000
Non Covered Loans [Member] | Pass Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	98,584,000		70,819,000
Non Covered Loans [Member] | Pass Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	4,947,300,000		4,854,453,000
Non Covered Loans [Member] | Pass Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	387,714,000		426,823,000
Non Covered Loans [Member] | Pass Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	537,640,000		543,064,000
Non Covered Loans [Member] | Pass Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,569,319,000		3,603,714,000
Non Covered Loans [Member] | Classified Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	4,674,435,000		4,691,391,000
Non Covered Loans [Member] | Classified Loans [Member] | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	174,571,000		161,931,000
Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	963,913,000		996,702,000
Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,238,581,000		1,267,844,000
Non Covered Loans [Member] | Classified Loans [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,227,495,000		1,134,518,000
Non Covered Loans [Member] | Classified Loans [Member] | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,604,560,000		3,560,995,000
Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	137,995,000		169,120,000
Non Covered Loans [Member] | Classified Loans [Member] | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	644,445,000		664,007,000
Non Covered Loans [Member] | Classified Loans [Member] | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	216,160,000		221,586,000
Non Covered Loans [Member] | Classified Loans [Member] | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	5,674,000		5,642,000
Non Covered Loans [Member] | Classified Loans [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	65,601,000		70,041,000
PUERTO RICO
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			19,188,842,000		18,991,341,000
PUERTO RICO | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	8,861,370,000		8,983,324,000		9,371,716,000
PUERTO RICO | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	708,201,000		707,767,000		770,476,000
PUERTO RICO | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	5,911,341,000		5,862,437,000		5,278,656,000
PUERTO RICO | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	543,314,000		548,706,000		565,881,000
PUERTO RICO | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,058,161,000		3,086,608,000		3,004,612,000
PUERTO RICO | Classified Loans [Member] | Special Mention Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,951,503,000	[1]	2,970,427,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	680,666,000	[1]	629,751,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	411,000	[1]	420,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	161,701,000	[1]	177,523,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	185,413,000	[1]	201,375,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	330,584,000	[1]	248,188,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	678,109,000	[1]	627,506,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,557,000	[1]	2,245,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Watch [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	618,586,000	[1]	638,310,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	690,000	[1]	698,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	128,583,000	[1]	134,266,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	188,528,000	[1]	192,591,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	268,899,000	[1]	282,935,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	586,700,000	[1]	610,490,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	31,886,000	[1]	27,820,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			0	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Special Mention Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,107,060,000	[1]	2,094,555,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	15,748,000	[1]	11,848,000	[1]
Weighted average obligor risk rating	11.93	[1]	11.91	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	211,376,000	[1]	210,596,000	[1]
Weighted average obligor risk rating	11.28	[1]	11.23	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	677,087,000	[1]	680,912,000	[1]
Weighted average obligor risk rating	11.56	[1]	11.56	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	476,301,000	[1]	439,853,000	[1]
Weighted average obligor risk rating	11.38	[1]	11.40	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,380,512,000	[1]	1,343,209,000	[1]
Weighted average obligor risk rating	11.46	[1]	11.46	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	65,463,000	[1]	69,562,000	[1]
Weighted average obligor risk rating	11.77	[1]	11.76	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	610,678,000	[1]	626,771,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,385,000	[1]	1,365,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Substandard Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	47,022,000	[1]	53,648,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	10,897,000	[1]	12,429,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,802,000	[1]	2,886,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,560,000	[1]	4,631,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,223,000	[1]	3,326,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	9,585,000	[1]	10,843,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,312,000	[1]	1,586,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Doubtful Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	7,393,000	[1]	9,750,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,084,000	[1]	1,458,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,084,000	[1]	1,458,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0	[1]	0	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,289,000	[1]	4,277,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	4,020,000	[1]	4,015,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	11,435,997,000	[1]	11,455,344,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	92,729,000	[1]	110,150,000	[1]
Weighted average obligor risk rating	5.99	[1]	5.92	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	774,203,000	[1]	736,235,000	[1]
Weighted average obligor risk rating	7.08	[1]	7.16	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,033,377,000	[1]	1,151,917,000	[1]
Weighted average obligor risk rating	6.83	[1]	6.85	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,873,370,000	[1]	1,878,774,000	[1]
Weighted average obligor risk rating	6.81	[1]	6.62	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,773,679,000	[1]	3,877,076,000	[1]
Weighted average obligor risk rating	6.87	[1]	6.79	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	74,550,000	[1]	59,728,000	[1]
Weighted average obligor risk rating	7.93	[1]	7.84	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	4,149,667,000	[1]	4,062,712,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	537,640,000	[1]	543,064,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Pass Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,900,461,000	[1]	2,912,764,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	3,424,602,000	[1]	3,384,795,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	16,849,000	[1]	12,966,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	504,462,000	[1]	525,271,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,054,588,000	[1]	1,079,509,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,080,091,000	[1]	975,760,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,655,990,000	[1]	2,593,506,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	101,218,000	[1]	101,213,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	610,678,000	[1]	626,771,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Finance Leases Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	5,674,000	[1]	5,642,000	[1]
PUERTO RICO | Non Covered Loans [Member] | Classified Loans [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	51,042,000	[1]	57,663,000	[1]
UNITED STATES | Classified Loans [Member] | Doubtful Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0
UNITED STATES | Non Covered Loans [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	683,417,000		703,328,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	328,890,000		351,979,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	71,457,000		71,335,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	167,425,000		192,080,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	27,156,000		21,109,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	24,199,000		30,020,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	290,237,000		314,544,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,515,000		3,202,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	37,138,000		34,233,000
UNITED STATES | Non Covered Loans [Member] | Watch [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Special Mention Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	144,435,000		152,638,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	10,546,000		8,230,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	49,888,000		48,085,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	13,717,000		20,859,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	32,386,000		26,131,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	106,537,000		103,305,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		10,609,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	37,898,000		38,724,000
UNITED STATES | Non Covered Loans [Member] | Special Mention Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Substandard Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	768,690,000		795,268,000
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	75,719,000		69,400,000
Weighted average obligor risk rating	11.22		11.20
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	242,138,000		231,266,000
Weighted average obligor risk rating	11.36		11.35
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	143,120,000		146,367,000
Weighted average obligor risk rating	11.37		11.41
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	90,819,000		102,607,000
Weighted average obligor risk rating	11.44		11.39
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	551,796,000		549,640,000
Weighted average obligor risk rating	11.36		11.35
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	35,262,000		54,096,000
Weighted average obligor risk rating	11.37		11.78
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	33,767,000		37,236,000
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	141,124,000		148,629,000
Weighted average obligor risk rating	11.50		11.45
UNITED STATES | Non Covered Loans [Member] | Substandard Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	6,741,000		5,667,000
UNITED STATES | Non Covered Loans [Member] | Doubtful Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income			0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Doubtful Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	7,818,000		6,711,000
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	0		0
UNITED STATES | Non Covered Loans [Member] | Unlikely To Be Collected Financing Receivable Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	7,818,000		6,711,000
UNITED STATES | Non Covered Loans [Member] | Pass Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	4,368,242,000		4,455,861,000
UNITED STATES | Non Covered Loans [Member] | Pass Member | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	534,986,000		536,852,000
Weighted average obligor risk rating	7.11		7.09
UNITED STATES | Non Covered Loans [Member] | Pass Member | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	903,245,000		932,562,000
Weighted average obligor risk rating	6.98		7.00
UNITED STATES | Non Covered Loans [Member] | Pass Member | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	393,593,000		397,505,000
Weighted average obligor risk rating	7.00		7.04
UNITED STATES | Non Covered Loans [Member] | Pass Member | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	658,179,000		668,337,000
Weighted average obligor risk rating	6.88		6.85
UNITED STATES | Non Covered Loans [Member] | Pass Member | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	2,490,003,000		2,535,256,000
Weighted average obligor risk rating	6.87		6.99
UNITED STATES | Non Covered Loans [Member] | Pass Member | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	24,034,000		11,091,000
Weighted average obligor risk rating	7.68		7.52
UNITED STATES | Non Covered Loans [Member] | Pass Member | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	797,633,000		791,741,000
UNITED STATES | Non Covered Loans [Member] | Pass Member | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	387,714,000		426,823,000
Weighted average obligor risk rating	7.46		7.47
UNITED STATES | Non Covered Loans [Member] | Pass Member | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	668,858,000		690,950,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	1,249,833,000		1,306,596,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Multi Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	157,722,000		148,965,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	459,451,000		471,431,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	183,993,000		188,335,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	147,404,000		158,758,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	948,570,000		967,489,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Commercial Real Estate Construction Financing Receivable Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	36,777,000		67,907,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Mortgages
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	33,767,000		37,236,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Legacy [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	216,160,000		221,586,000
UNITED STATES | Non Covered Loans [Member] | Classified Loans [Member] | Consumer Portfolio Segment Member
Financing Receivable, Recorded Investment [Line Items]
Loans held-in-portfolio, net of unearned income	$ 14,559,000		$ 12,378,000

[1] Excludes covered loans acquired in the Westernbank FDIC-assisted transaction.