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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Major Categories of Securities Owned (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Issuer
Dec. 31, 2017
USD ($)
Issuer
Security
Dec. 31, 2016
USD ($)
Sep. 01, 2008
USD ($)
Security
Debt securities available-for-sale: [Abstract]        
Amortized Cost $ 505,786      
Gross Unrealized Gains 776      
Gross Unrealized Losses (3,677)      
Fair Value 502,885      
Investment securities available-for-sale [Abstract]        
Amortized Cost   $ 354,968    
Gross Unrealized Gains   996    
Gross Unrealized Losses   (574)    
Fair Value   355,390    
Proceeds [Abstract]        
Marketable equity securities 1,059 0 $ 0  
Investment securities available-for-sale 0 377 0  
Trading securities 0 4,629 3,648  
Investment and Mortgage-Backed Securities [Abstract]        
Securities pledged as collateral for bank's first loss guarantee $ 27,248 $ 28,738    
Number of holdings in investment securities of a single issuer in amount greater than 10% of stockholders equity | Issuer 0 0    
Sale of TRUP CDO Securities [Abstract]        
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity $ 0 $ 50 51  
Net increase decrease in non-credit component of OTTI 0 (20) (34)  
Net (loss) gain on securities [1] 1,068 2,740 123  
Proceeds from sales of mortgage backed securities available-for-sale 158,758 15,000 0  
Gross gain recognized on sale of mortgage backed securities available for sale 1,370 (36) 0  
ASU 2016-01 [Member]        
Unrealized Gains, Net of Taxes [Abstract]        
Reclassification of unrealized gains and losses on marketable equity securities   0    
Retained Earnings [Member] | ASU 2016-01 [Member]        
Unrealized Gains, Net of Taxes [Abstract]        
Reclassification of unrealized gains and losses on marketable equity securities   153    
Accumulated Other Comprehensive Loss [Member] | ASU 2016-01 [Member]        
Unrealized Gains, Net of Taxes [Abstract]        
Reclassification of unrealized gains and losses on marketable equity securities [2]   (153)    
Marketable Equity Securities [Member]        
Sale of TRUP CDO Securities [Abstract]        
Net (loss) gain on securities (302)      
Trading Securities [Member]        
Sale of TRUP CDO Securities [Abstract]        
Net (loss) gain on securities   133 123  
Registered Mutual Funds [Member]        
Investment securities available-for-sale [Abstract]        
Amortized Cost   3,779    
Gross Unrealized Gains   311    
Gross Unrealized Losses   (84)    
Fair Value   $ 4,006    
Agency Notes [Member]        
Debt securities available-for-sale: [Abstract]        
Amortized Cost 25,110      
Gross Unrealized Gains 45      
Gross Unrealized Losses (10)      
Fair Value $ 25,145      
Investment and Mortgage-Backed Securities [Abstract]        
Securities weighted average term to maturity 4 years 1 month 6 days      
Corporate Securities [Member]        
Debt securities available-for-sale: [Abstract]        
Amortized Cost $ 11,167      
Gross Unrealized Gains 0      
Gross Unrealized Losses (32)      
Fair Value $ 11,135      
Investment and Mortgage-Backed Securities [Abstract]        
Securities weighted average term to maturity 4 years 2 months 12 days      
Pooled Bank Trust Preferred Securities ('TRUP CDOs') [Member]        
Sale of TRUP CDO Securities [Abstract]        
Number of TRUP CDO securities | Security   6    
Number of TRUP CDO securities deemed OTTI | Security   5   8
Amortized cost of securities transferred   $ 5,331   $ 19,922
OTTI charges   8,553    
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity   705    
Net increase decrease in non-credit component of OTTI   524    
Proceeds from the sales of investment securities held-to-maturity $ 0 9,167    
Gross gains recognized from sale of securities   3,048    
Gross losses recognized on sale of securities   441    
Pass-through MBS issued by Government-sponsored Enterprises ("GSEs") [Member]        
Debt securities available-for-sale: [Abstract]        
Amortized Cost 356,039      
Gross Unrealized Gains 574      
Gross Unrealized Losses (2,000)      
Fair Value $ 354,613      
Investment securities available-for-sale [Abstract]        
Amortized Cost   72,938    
Gross Unrealized Gains   16    
Gross Unrealized Losses   (325)    
Fair Value   72,629    
Investment and Mortgage-Backed Securities [Abstract]        
Securities weighted average term to maturity 13 years      
Sale of TRUP CDO Securities [Abstract]        
Proceeds from sales of mortgage backed securities available-for-sale $ 274 15,000 0  
Gross gain recognized on sale of mortgage backed securities available for sale 4      
Gross loss recognized on sale of mortgage backed securities available for sale   36    
Income tax benefit related to loss on sales of mortgage backed securities available for sale 1 16    
Agency Collateralized Mortgage Obligation ("CMO") [Member]        
Debt securities available-for-sale: [Abstract]        
Amortized Cost 113,470      
Gross Unrealized Gains 157      
Gross Unrealized Losses (1,635)      
Fair Value $ 111,992      
Investment securities available-for-sale [Abstract]        
Amortized Cost   278,251    
Gross Unrealized Gains   669    
Gross Unrealized Losses   (165)    
Fair Value   278,755    
Investment and Mortgage-Backed Securities [Abstract]        
Securities weighted average term to maturity 13 years      
Sale of TRUP CDO Securities [Abstract]        
Proceeds from sales of mortgage backed securities available-for-sale $ 158,484 $ 0 $ 0  
Gross gain recognized on sale of mortgage backed securities available for sale 1,366      
Income tax benefit related to loss on sales of mortgage backed securities available for sale $ 437      
[1] Amount includes periodic valuation gains or losses on marketable equity and trading securities.
[2] Represents the impact of adopting ASU 2016-01 allowing the reclassification of unrealized gains and losses on available-for-sale equity securities from accumulated other comprehensive income to Retained Earnings.