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Fair Value and Gross Unrealized Losses of Investment Securities Held-To-Maturity, Aggregated by Investment Category and Length of Time Individual Securities Have Been in a Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Investments, Unrealized Loss Position [Line Items]   
Less than 12 months Fair Value$ 18,078$ 78,110$ 243
Less than 12 months Gross Unrealized Losses3991,9237
12 months or more Fair Value30,38793931,307
12 months or more Gross Unrealized Losses91512715
Total Fair Value48,46579,04931,550
Total Gross Unrealized Losses1,3141,935722
Obligations of Puerto Rico, States and political subdivisions
   
Investments, Unrealized Loss Position [Line Items]   
Less than 12 months Fair Value18,07851,9950
Less than 12 months Gross Unrealized Losses3991,9150
12 months or more Fair Value30,23477331,126
12 months or more Gross Unrealized Losses9062704
Total Fair Value48,31252,76831,126
Total Gross Unrealized Losses1,3051,917704
Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
   
Investments, Unrealized Loss Position [Line Items]   
Less than 12 months Fair Value000
Less than 12 months Gross Unrealized Losses000
12 months or more Fair Value153166181
12 months or more Gross Unrealized Losses91011
Total Fair Value153166181
Total Gross Unrealized Losses91011
U.S. Treasury securities
   
Investments, Unrealized Loss Position [Line Items]   
Less than 12 months Fair Value025,8720
Less than 12 months Gross Unrealized Losses010
12 months or more Fair Value000
12 months or more Gross Unrealized Losses000
Total Fair Value025,8720
Total Gross Unrealized Losses010
Other
   
Investments, Unrealized Loss Position [Line Items]   
Less than 12 months Fair Value0243243
Less than 12 months Gross Unrealized Losses077
12 months or more Fair Value000
12 months or more Gross Unrealized Losses000
Total Fair Value0243243
Total Gross Unrealized Losses$ 0$ 7$ 7