Foreclosed Real Estate (Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Real Estate Owned Rollforward [Line Items]
Foreclosed real estate beginning balance	$ 47,520	$ 58,176	$ 95,750
Other Real Estate Owned Write Downs	(6,560)	(13,003)	(24,290)
Other Real Estate Owned Additions	23,101	21,633	36,565
Other Real Estate Owned Sales	(19,598)	(19,286)	(46,346)
Other Real Estate Owned Other Adjustments	(289)	0	(3,503)
Foreclosed real estate ending balance	44,174	47,520	58,176
Originated Loans [Member]
Other Real Estate Owned Rollforward [Line Items]
Foreclosed real estate beginning balance	12,390	10,324	12,343
Other Real Estate Owned Write Downs	(1,913)	(1,966)	(2,831)
Other Real Estate Owned Additions	10,565	10,170	9,817
Other Real Estate Owned Sales	(6,615)	(6,138)	(5,933)
Other Real Estate Owned Other Adjustments	(144)	0	(3,072)
Foreclosed real estate ending balance	14,283	12,390	10,324
Acquired BBVAPR loans [Member]
Other Real Estate Owned Rollforward [Line Items]
Foreclosed real estate beginning balance	21,379	26,757	35,804
Other Real Estate Owned Write Downs	(2,850)	(6,124)	(7,668)
Other Real Estate Owned Additions	9,416	7,872	8,213
Other Real Estate Owned Sales	(9,453)	(7,126)	(9,338)
Other Real Estate Owned Other Adjustments	(145)	0	(254)
Foreclosed real estate ending balance	18,347	21,379	26,757
Eurobank [Member]
Other Real Estate Owned Rollforward [Line Items]
Foreclosed real estate beginning balance	13,751	21,095	47,603
Other Real Estate Owned Write Downs	(1,797)	(4,913)	(13,791)
Other Real Estate Owned Additions	3,120	3,591	18,535
Other Real Estate Owned Sales	(3,530)	(6,022)	(31,075)
Other Real Estate Owned Other Adjustments	0	0	(177)
Foreclosed real estate ending balance	$ 11,544	$ 13,751	$ 21,095