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Securities Purchased Under Agreements to Resell and Investment (Investment securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 1,437,106 $ 1,575,043
Available-for-sale Securities, Gross Unrealized Gains 32,771 34,096
Available-for-sale Securities, Gross Unrealized Losses 14,192 20,714
Available-for-sale Securities 1,455,685 1,588,425
Available for sale - Weighted Average Yield 2.74% 2.89%
Collateralized Mortgage Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 1,311,171 1,419,117
Available-for-sale Securities, Gross Unrealized Gains 32,546 33,929
Available-for-sale Securities, Gross Unrealized Losses 8,852 13,507
Available-for-sale Securities 1,334,865 1,439,539
Available for sale - Weighted Average Yield 2.84% 2.76%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 1,093,717 1,190,910
Available-for-sale Securities, Gross Unrealized Gains 31,769 33,089
Available-for-sale Securities, Gross Unrealized Losses 4,690 6,669
Available-for-sale Securities 1,120,796 1,217,330
Available for sale - Weighted Average Yield 3.00% 2.93%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 6,146 7,406
Available-for-sale Securities, Gross Unrealized Gains 426 433
Available-for-sale Securities, Gross Unrealized Losses 23 24
Available-for-sale Securities 6,549 7,815
Available for sale - Weighted Average Yield 4.93% 4.92%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 211,308 220,801
Available-for-sale Securities, Gross Unrealized Gains 351 407
Available-for-sale Securities, Gross Unrealized Losses 4,139 6,814
Available-for-sale Securities 207,520 214,394
Available for sale - Weighted Average Yield 1.78% 1.78%
Securities Investment [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 125,935 155,926
Available-for-sale Securities, Gross Unrealized Gains 225 167
Available-for-sale Securities, Gross Unrealized Losses 5,340 7,207
Available-for-sale Securities 120,820 148,886
Available for sale - Weighted Average Yield 1.72% 2.99%
Securities Investment [Member] | US Treasury Securities [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 70,000  
Available-for-sale Securities, Gross Unrealized Gains 0  
Available-for-sale Securities, Gross Unrealized Losses 0  
Available-for-sale Securities 70,000  
Available for sale - Weighted Average Yield 0.03%  
Securities Investment [Member] | Obligation of US Government sponsored agencies [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 9,539 10,691
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 42 42
Available-for-sale Securities 9,497 10,649
Available for sale - Weighted Average Yield 1.23% 1.21%
Securities Investment [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 22,367 121,035
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 5,298 6,845
Available-for-sale Securities 17,069 114,190
Available for sale - Weighted Average Yield 5.32% 4.38%
Securities Investment [Member] | Other Debt Obligations [Member]
   
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 24,029 24,200
Available-for-sale Securities, Gross Unrealized Gains 225 167
Available-for-sale Securities, Gross Unrealized Losses 0 320
Available-for-sale Securities $ 24,254 $ 24,047
Available for sale - Weighted Average Yield 3.46% 3.46%