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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Major Categories of Securities Owned (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Security
Dec. 31, 2016
USD ($)
Issuer
Dec. 31, 2015
USD ($)
Sep. 01, 2008
USD ($)
Security
Pooled bank trust preferred securities ("TRUP CDOs") [Abstract]        
Amortized Cost $ 0 $ 5,378    
Fair Value   7,296    
Investment Securities Available-for-Sale [Abstract]        
Amortized Cost 354,968 7,618 [1]    
Gross Unrealized Gains 996 74    
Gross Unrealized Losses (574) (239)    
Fair Value 355,390 7,453    
Total Investment Securities [Abstract]        
Amortized Cost [1]   12,996    
Gross Unrealized Gains   2,295    
Gross Unrealized Losses   (542)    
Fair Value   14,749    
Investment and Mortgage-Backed Securities [Abstract]        
Securities pledged as collateral for bank's first loss guarantee 28,738 $ 0    
Number of holdings in investment securities of a single issuer in amount greater than 10% of stockholders equity | Issuer   0    
Proceeds from the sales of investment securities held-to-maturity 9,167 $ 0 $ 0  
Proceeds [Abstract]        
Proceeds from sales of investment securities available for sale (Registered Mutual Funds) 377 0 2,070  
Trading Securities 4,629 3,648 1,340  
Proceeds from sales of mortgage backed securities available-for-sale 15,000 0 24,307  
Freddie Mac [Member]        
Investment Securities Available-for-Sale [Abstract]        
Fair Value 277,218      
Pooled Bank Trust Preferred Securities ('TRUP CDOs') [Member]        
Pooled bank trust preferred securities ("TRUP CDOs") [Abstract]        
Amortized Cost [1]   5,378    
Gross Unrealized Gains   2,221    
Gross Unrealized Losses   (303)    
Fair Value   7,296    
Investment and Mortgage-Backed Securities [Abstract]        
Unamortized portion of the unrealized loss amount recognized $ 705 755    
Number of TRUP CDO securities | Security 6      
Amortized cost of securities transferred $ 5,331     $ 19,922
OTTI charges 8,553      
Proceeds from the sales of investment securities held-to-maturity 9,167 0    
Gross gains recognized from sale of securities 3,048      
Gross losses recognized on sale of securities $ 441      
Proceeds [Abstract]        
Number of trust preferred securities transferred to available for sale from held to maturity | Security 5     8
Unrealized loss on securities transferred recognized in accumulated other comprehensive income loss net of tax       $ 8,420
Registered Mutual Funds [Member]        
Investment Securities Available-for-Sale [Abstract]        
Amortized Cost $ 3,779 4,011 [1]    
Gross Unrealized Gains 311 62    
Gross Unrealized Losses (84) (178)    
Fair Value 4,006 3,895    
Proceeds [Abstract]        
Proceeds from sales of investment securities available for sale (Registered Mutual Funds) 377 0 2,070  
Pass-through MBS Issued by Government Sponsored Entities ("GSEs") [Member]        
Investment Securities Available-for-Sale [Abstract]        
Amortized Cost 340,574 360 [1]    
Gross Unrealized Gains 681 12    
Gross Unrealized Losses (376) 0    
Fair Value $ 340,879 372    
Investment and Mortgage-Backed Securities [Abstract]        
Weighted average term to maturity at period end 12 years 9 months 18 days      
Weighted average duration at period end 4 years 9 months 18 days      
Proceeds [Abstract]        
Proceeds from sales of mortgage backed securities available-for-sale $ 15,000 0 24,307  
Gross gain recognized on sale of mortgage backed securities available for sale     1,395  
Gross loss recognized on sale of mortgage backed securities available for sale 36   7  
Income tax benefit related to loss on sales of mortgage backed securities available for sale 16   624  
Agency Collateralized Mortgage Obligation ("CMO") [Member]        
Investment Securities Available-for-Sale [Abstract]        
Amortized Cost 10,615 3,247 [1]    
Gross Unrealized Gains 4 0    
Gross Unrealized Losses (114) (61)    
Fair Value $ 10,505 3,186    
Investment and Mortgage-Backed Securities [Abstract]        
Weighted average term to maturity at period end 16 years 3 months 18 days      
Proceeds [Abstract]        
Proceeds from sales of investment securities available for sale (Registered Mutual Funds) $ 0 0 0  
Trading Securities [Member]        
Proceeds [Abstract]        
Trading Securities $ 4,629 $ 3,648 $ 1,340  
[1] Amount represents the purchase amortized / historical cost less any OTTI charges (credit or non-credit related) previously recognized. For the TRUP CDOs, amount is also net of the $755 unamortized portion of the unrealized loss that was recognized in accumulated other comprehensive loss on September 1, 2008 (the day on which these securities were transferred from available-for-sale to held-to-maturity).