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Investment Securities (Investment securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 796,558 $ 749,867
Available-for-sale Securities, Gross Unrealized Gains 8,964 8,740
Available-for-sale Securities, Gross Unrealized Losses 5,480 7,123
Available-for-sale Securities $ 800,042 $ 751,484
Available for sale - Weighted Average Yield 2.57% 2.53%
Held-to-maturity, Amortized cost $ 577,997 $ 599,884
Held to maturity Securities Unrecognized Gains 118 145
Held-to-maturity Securities, Unrecognized Loss 7,152 7,266
Held to maturity Fair Value $ 570,963 $ 592,763
Held to maturity - Weighted Average Yield 2.13% 2.15%
Total Securities - Amortized Cost $ 1,374,555 $ 1,349,751
Total Securities Gross Unrealized Gains 9,082 8,885
Total Securities Gross Unrealized Losses 12,632 14,389
Total Securities Fair Value $ 1,371,005 $ 1,344,247
Marketable Securities Weighted Average Yield 2.38% 2.36%
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 737,021 $ 689,772
Available-for-sale Securities, Gross Unrealized Gains 8,886 8,659
Available-for-sale Securities, Gross Unrealized Losses 4,502 5,879
Available-for-sale Securities $ 741,405 $ 692,552
Available for sale - Weighted Average Yield 2.61% 2.57%
Held-to-maturity, Amortized cost $ 577,997 $ 599,884
Held to maturity Securities Unrecognized Gains 118 145
Held-to-maturity Securities, Unrecognized Loss 7,152 7,266
Held to maturity Fair Value $ 570,963 $ 592,763
Held to maturity - Weighted Average Yield 2.13% 2.15%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 452,484 $ 422,168
Available-for-sale Securities, Gross Unrealized Gains 6,703 6,354
Available-for-sale Securities, Gross Unrealized Losses 2,165 3,036
Available-for-sale Securities $ 457,022 $ 425,486
Available for sale - Weighted Average Yield 2.62% 2.59%
Held-to-maturity, Amortized cost $ 577,997 $ 599,884
Held to maturity Securities Unrecognized Gains 118 145
Held-to-maturity Securities, Unrecognized Loss 7,152 7,266
Held to maturity Fair Value $ 570,963 $ 592,763
Held to maturity - Weighted Average Yield 2.13% 2.15%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 186,514 $ 163,614
Available-for-sale Securities, Gross Unrealized Gains 2,110 2,241
Available-for-sale Securities, Gross Unrealized Losses 727 620
Available-for-sale Securities $ 187,897 $ 165,235
Available for sale - Weighted Average Yield 2.96% 2.95%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 98,023 $ 103,990
Available-for-sale Securities, Gross Unrealized Gains 73 64
Available-for-sale Securities, Gross Unrealized Losses 1,610 2,223
Available-for-sale Securities $ 96,486 $ 101,831
Available for sale - Weighted Average Yield 1.89% 1.88%
Securities Investment [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 59,537 $ 60,095
Available-for-sale Securities, Gross Unrealized Gains 78 81
Available-for-sale Securities, Gross Unrealized Losses 978 1,244
Available-for-sale Securities $ 58,637 $ 58,932
Available for sale - Weighted Average Yield 2.05% 2.04%
Securities Investment [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 49,530 $ 49,672
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 526 618
Available-for-sale Securities $ 49,004 $ 49,054
Available for sale - Weighted Average Yield 1.73% 1.73%
Securities Investment [Member] | Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 3,604 $ 3,903
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 19 19
Available-for-sale Securities $ 3,585 $ 3,884
Available for sale - Weighted Average Yield 1.38% 1.38%
Securities Investment [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 4,680 $ 4,680
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses 433 607
Available-for-sale Securities $ 4,247 $ 4,073
Available for sale - Weighted Average Yield 5.55% 5.55%
Securities Investment [Member] | Other Debt Obligations [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 1,723 $ 1,840
Available-for-sale Securities, Gross Unrealized Gains 78 81
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities $ 1,801 $ 1,921
Available for sale - Weighted Average Yield 2.97% 3.00%