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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available for sale Amortized Cost $ 648,800,000 $ 749,867,000
Available-for-sale Securities 645,797,000 751,484,000
Held-to-maturity, Amortized cost 506,064,000 599,884,000
Held to maturity Fair Value 497,681,000 592,763,000
Maturities Due From One To Five Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 19,283,000  
Available-for-sale Securities 19,148,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Maturities Due From Five To Ten Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 200,144,000  
Available-for-sale Securities 196,689,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Maturities Due After Ten Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 426,593,000  
Available-for-sale Securities 427,543,000  
Held-to-maturity, Amortized cost 506,064,000  
Held to maturity Fair Value 497,681,000  
Collateralized Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 631,656,000 689,772,000
Available-for-sale Securities 629,124,000 692,552,000
Held-to-maturity, Amortized cost 506,064,000 599,884,000
Held to maturity Fair Value 497,681,000 592,763,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 383,194,000 422,168,000
Available-for-sale Securities 381,715,000 425,486,000
Held-to-maturity, Amortized cost 506,064,000 599,884,000
Held to maturity Fair Value 497,681,000 592,763,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 166,436,000 163,614,000
Available-for-sale Securities 167,338,000 165,235,000
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 82,026,000 103,990,000
Available-for-sale Securities 80,071,000 101,831,000
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 6,405,000  
Available-for-sale Securities 6,430,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due From One To Five Years [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 6,405,000  
Available-for-sale Securities 6,430,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 198,658,000  
Available-for-sale Securities 195,151,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 126,096,000  
Available-for-sale Securities 124,446,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 72,562,000  
Available-for-sale Securities 70,705,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 426,593,000  
Available-for-sale Securities 427,543,000  
Held-to-maturity, Amortized cost 506,064,000  
Held to maturity Fair Value 497,681,000  
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | FNMA and FHLMC [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 250,693,000  
Available-for-sale Securities 250,839,000  
Held-to-maturity, Amortized cost 506,064,000  
Held to maturity Fair Value 497,681,000  
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 166,436,000  
Available-for-sale Securities 167,338,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 9,464,000  
Available-for-sale Securities 9,366,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 17,144,000 60,095,000
Available-for-sale Securities 16,673,000 58,932,000
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 10,276,000 49,672,000
Available-for-sale Securities 10,163,000 49,054,000
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 2,927,000 3,903,000
Available-for-sale Securities 2,879,000 3,884,000
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 2,455,000 4,680,000
Available-for-sale Securities 2,093,000 4,073,000
Investment Securities | Other Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 1,486,000 1,840,000
Available-for-sale Securities 1,538,000 $ 1,921,000
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due In Less Than One Year [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 2,780,000  
Available-for-sale Securities 2,417,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due In Less Than One Year [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 325,000  
Available-for-sale Securities 324,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due In Less Than One Year [Member] | Obligation of Puerto Rico Government and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 2,455,000  
Available-for-sale Securities 2,093,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due From One To Five Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 12,878,000  
Available-for-sale Securities 12,718,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 9,951,000  
Available-for-sale Securities 9,839,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of US Government sponsored agencies at loss [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 2,927,000  
Available-for-sale Securities 2,879,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due From Five To Ten Years [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 1,486,000  
Available-for-sale Securities 1,538,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value 0  
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available for sale Amortized Cost 1,486,000  
Available-for-sale Securities 1,538,000  
Held-to-maturity, Amortized cost 0  
Held to maturity Fair Value $ 0