STOCKHOLDERS' EQUITY - Additional Information (Detail) - USD ($)						12 Months Ended
	Dec. 14, 2018	Nov. 14, 2018	May 17, 2018	Aug. 03, 2017	Feb. 07, 2017	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Common stock, shares authorized						2,000,000,000	2,000,000,000
Common stock, par value						$ 0.1	$ 0.1
Common stock, shares issued						221,789,509	220,382,343
Common stock, shares outstanding						217,235,140	216,278,040
Common Stock Dividends Per Share Declared		$ 0.03
Common Stock, Dividends, Per Share, Cash Paid	$ 0.03
Preferred Stock Shares Authorized						50,000,000	50,000,000
Preferred stock, par value						$ 1	$ 1
Liquidation value per share, Preferred stock						$ 25
Treasury Stock Shares Acquired						434,066	438,891
Treasury Stock Shares						4,554,369	4,104,303
Legal Surplus Amount						$ 80,191,000	$ 59,693,000
7.125% Noncumulative Perpetual Monthly Income Preferred Stock, Series A [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage						7.125%
8.35% Noncumulative Perpetual Monthly Income Preferred Stock, Series B [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage						8.35%
7.40% Noncumulative Perpetual Monthly Income Preferred Stock, Series C [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage						7.40%
7.25% Noncumulative Perpetual Monthly Income Preferred Stock, Series D [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage						7.25%
7.00% Noncumulative Perpetual Monthly Income Preferred Stock, Series E [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage						7.00%
FirstBank [Member]
Class Of Stock [Line Items]
Legal Surplus Amount Additions						$ 20,500,000	7,300,000
Legal surplus reserve rate						10.00%
Legal Surplus Amount						$ 80,200,000	$ 59,700,000
Original amount contributed in percentage						20.00%
Common Stock [Member]
Class Of Stock [Line Items]
Dividends, Cash						$ 6,500,000
Common Stock [Member] | Department Of Treasury [Member]
Class Of Stock [Line Items]
Common stock purchased through a warrants excercise			1,285,899
Common stock shares issued as result of warrants excercise			730,571
Shares Used To Cover Strike Price			555,328
Cash Paid In Lieu Of Fractional Shares			$ 6.58
Common Stock [Member] | THL and Oaktree [Member]
Class Of Stock [Line Items]
Stock Issued During Period Shares New Issues				20,000,000	20,000,000
Purchase Of Common Stock Secondary Offering							3,000,000
Percentage Of Stock Ownership						5.00%
Common Stock [Member] | Oaktree Capital Management [Member]
Class Of Stock [Line Items]
Stock Issued During Period Shares New Issues				10,000,000	10,000,000
Common Stock [Member] | Thomas H Lee Partners [Member]
Class Of Stock [Line Items]
Stock Issued During Period Shares New Issues				10,000,000	10,000,000