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Investment Securities (Investment securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 749,867 $ 955,646
Available-for-sale Securities, Gross Unrealized Gains 8,740 27,312
Available-for-sale Securities, Gross Unrealized Losses 7,123 8,349
Available-for-sale Securities $ 751,484 $ 974,609
Available for sale - Weighted Average Yield 2.53% 2.87%
Held-to-maturity, Amortized cost $ 599,884 $ 620,189
Held to maturity Securities Unrecognized Gains 145 426
Held-to-maturity Securities, Unrecognized Loss 7,266 5,936
Held to maturity Fair Value $ 592,763 $ 614,679
Held to maturity - Weighted Average Yield 2.15% 2.17%
Total Securities - Amortized Cost $ 1,349,751 $ 1,575,835
Total Securities Gross Unrealized Gains 8,885 27,738
Total Securities Gross Unrealized Losses 14,389 14,285
Total Securities Fair Value $ 1,344,247 $ 1,589,288
Marketable Securities Weighted Average Yield 2.36% 2.60%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 689,772 $ 930,279
Available-for-sale Securities, Gross Unrealized Gains 8,659 27,184
Available-for-sale Securities, Gross Unrealized Losses 5,879 4,250
Available-for-sale Securities $ 692,552 $ 953,213
Available for sale - Weighted Average Yield 2.57% 2.82%
Held-to-maturity, Amortized cost $ 599,884 $ 595,157
Held to maturity Securities Unrecognized Gains 145 426
Held-to-maturity Securities, Unrecognized Loss 7,266 5,865
Held to maturity Fair Value $ 592,763 $ 589,718
Held to maturity - Weighted Average Yield 2.15% 2.24%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 422,168 $ 735,363
Available-for-sale Securities, Gross Unrealized Gains 6,354 25,791
Available-for-sale Securities, Gross Unrealized Losses 3,036 1,509
Available-for-sale Securities $ 425,486 $ 759,645
Available for sale - Weighted Average Yield 2.59% 2.97%
Held-to-maturity, Amortized cost $ 599,884 $ 595,157
Held to maturity Securities Unrecognized Gains 145 426
Held-to-maturity Securities, Unrecognized Loss 7,266 5,865
Held to maturity Fair Value $ 592,763 $ 589,718
Held to maturity - Weighted Average Yield 2.15% 2.24%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 163,614 $ 57,129
Available-for-sale Securities, Gross Unrealized Gains 2,241 1,366
Available-for-sale Securities, Gross Unrealized Losses 620 0
Available-for-sale Securities $ 165,235 $ 58,495
Available for sale - Weighted Average Yield 2.95% 3.19%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 103,990 $ 137,787
Available-for-sale Securities, Gross Unrealized Gains 64 27
Available-for-sale Securities, Gross Unrealized Losses 2,223 2,741
Available-for-sale Securities $ 101,831 $ 135,073
Available for sale - Weighted Average Yield 1.88% 1.85%
Securities Investment [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 60,095 $ 25,367
Available-for-sale Securities, Gross Unrealized Gains 81 128
Available-for-sale Securities, Gross Unrealized Losses 1,244 4,099
Available-for-sale Securities $ 58,932 $ 21,396
Available for sale - Weighted Average Yield 2.04% 4.94%
Securities Investment [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 49,672  
Available-for-sale Securities, Gross Unrealized Gains 0  
Available-for-sale Securities, Gross Unrealized Losses 618  
Available-for-sale Securities $ 49,054  
Available for sale - Weighted Average Yield 1.73%  
Held-to-maturity, Amortized cost   $ 25,032
Held to maturity Securities Unrecognized Gains   0
Held-to-maturity Securities, Unrecognized Loss   71
Held to maturity Fair Value   $ 24,961
Held to maturity - Weighted Average Yield   0.49%
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 3,903 $ 5,122
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 19 29
Available-for-sale Securities $ 3,884 $ 5,093
Available for sale - Weighted Average Yield 1.38% 1.36%
Securities Investment [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 4,680 $ 17,801
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 607 4,070
Available-for-sale Securities $ 4,073 $ 13,731
Available for sale - Weighted Average Yield 5.55% 6.24%
Securities Investment [Member] | Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 1,840 $ 2,444
Available-for-sale Securities, Gross Unrealized Gains 81 128
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,921 $ 2,572
Available for sale - Weighted Average Yield 3.00% 2.98%