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Amortized cost, gross unrealized gains and losses, approximate fair value, weighted average yield and contractual maturities of investment securities held-to-maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 139,019 $ 140,496
Gross Unrealized Gains 888 264
Gross Unrealized Losses 12,108 20,072
Fair Value 127,799 120,688
Weighted Average Yield 3.38% 3.40%
US Treasury Securities [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [Member] | Within One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Treasury Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | Within One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Collateralized Mortgage Obligations Issued By Private Enterprise [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 114 115
Gross Unrealized Gains 0 7
Gross Unrealized Losses 9 0
Fair Value 105 122
Weighted Average Yield 5.45% 5.45%
Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises And U S Government [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 114 115
Gross Unrealized Gains 0 7
Gross Unrealized Losses 9 0
Fair Value 105 122
Weighted Average Yield 5.45% 5.45%
Other Securities [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 26,500 26,500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1 646
Fair Value 26,499 25,854
Weighted Average Yield 3.37% 3.37%
Other Securities [Member] | Within One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 26,250 26,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 645
Fair Value 26,250 25,355
Weighted Average Yield 3.39% 3.41%
Other Securities [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 250 500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1 1
Fair Value 249 499
Weighted Average Yield 1.37% 1.33%
Other Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
Other Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 0 0
Weighted Average Yield 0.00% 0.00%
US Government Sponsored Enterprises Debt Securities Member
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 0  
Weighted Average Yield 0.00%  
US Government Sponsored Enterprises Debt Securities Member | Within One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 0  
Weighted Average Yield 0.00%  
US Government Sponsored Enterprises Debt Securities Member | More Than One And Within Five Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 0  
Weighted Average Yield 0.00%  
US Government Sponsored Enterprises Debt Securities Member | More Than Five And Within Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 0  
Weighted Average Yield 0.00%  
US Government Sponsored Enterprises Debt Securities Member | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 0  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 0  
Weighted Average Yield 0.00%  
Puerto Rico States And Political Subdivisions Debt Securities [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 112,405 113,881
Gross Unrealized Gains 888 257
Gross Unrealized Losses 12,098 19,426
Fair Value 101,195 94,712
Weighted Average Yield 3.38% 3.40%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | Within One Year From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 12,685 12,570
Gross Unrealized Gains 0 0
Gross Unrealized Losses 23 12
Fair Value 12,662 12,558
Weighted Average Yield 2.10% 2.06%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | More Than One And Within Five Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 12,595 12,060
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,034 984
Fair Value 11,561 11,076
Weighted Average Yield 5.93% 5.91%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | More Than Five And Within Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 20,925 20,015
Gross Unrealized Gains 0 0
Gross Unrealized Losses 5,610 5,251
Fair Value 15,315 14,764
Weighted Average Yield 6.08% 6.06%
Puerto Rico States And Political Subdivisions Debt Securities [Member] | More Than Ten Years From Balance Sheet Date [Member]
   
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 66,200 69,236
Gross Unrealized Gains 888 257
Gross Unrealized Losses 5,431 13,179
Fair Value $ 61,657 $ 56,314
Weighted Average Yield 2.29% 2.43%