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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Major Categories of Securities Owned (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Securities, available-for-sale [Abstract]          
Amortized Cost $ 470,467   $ 470,467   $ 505,786
Gross Unrealized Gains 6,430   6,430   776
Gross Unrealized Losses (383)   (383)   (3,677)
Fair Value 476,514   476,514   502,885
Securities pledged as collateral 27,634   27,634   27,248
Available-for-sale Agency Securities [Abstract]          
Proceeds     104,131 $ 158,484  
Gross gains     (133) 1,370  
Net gains on securities [1] 91 $ 19 283 1,385  
Proceeds [Abstract]          
Marketable equity securities     273 529  
Marketable Equity Securities [Member]          
Available-for-sale Agency Securities [Abstract]          
Net gains on securities 148 19 416 15  
Proceeds [Abstract]          
Marketable equity securities 136 136 273 529  
Agency Notes [Member]          
Securities, available-for-sale [Abstract]          
Amortized Cost 40,488   40,488   25,110
Gross Unrealized Gains 64   64   45
Gross Unrealized Losses 0   0   (10)
Fair Value 40,552   $ 40,552   25,145
Investment and Mortgage-Backed Securities [Abstract]          
Securities weighted average term to maturity     6 years    
Available-for-sale Agency Securities [Abstract]          
Proceeds 3,038 0 $ 3,038 0  
Gross gains 39 0 39 0  
Tax expense on gain 12 0 12 0  
Gross losses 0 0 0 0  
Tax benefit on loss 0 0 0 0  
Corporate Securities [Member]          
Securities, available-for-sale [Abstract]          
Amortized Cost 26,118   26,118   11,167
Gross Unrealized Gains 345   345   0
Gross Unrealized Losses (10)   (10)   (32)
Fair Value 26,453   $ 26,453   11,135
Investment and Mortgage-Backed Securities [Abstract]          
Securities weighted average term to maturity     6 years    
Pass-through MBS Issued by GSEs [Member]          
Securities, available-for-sale [Abstract]          
Amortized Cost 261,836   $ 261,836   356,039
Gross Unrealized Gains 5,431   5,431   574
Gross Unrealized Losses 0   0   (2,000)
Fair Value 267,267   $ 267,267   354,613
Investment and Mortgage-Backed Securities [Abstract]          
Securities weighted average term to maturity     15 years 4 months 24 days    
Available-for-sale Agency Securities [Abstract]          
Proceeds 85,594 0 $ 91,711 0  
Gross gains 248 0 248 0  
Tax expense on gain 79 0 79 0  
Gross losses 344 0 518 0  
Tax benefit on loss (110) 0 (166) 0  
Agency CMOs [Member]          
Securities, available-for-sale [Abstract]          
Amortized Cost 142,025   142,025   113,470
Gross Unrealized Gains 590   590   157
Gross Unrealized Losses (373)   (373)   (1,635)
Fair Value 142,242   $ 142,242   $ 111,992
Investment and Mortgage-Backed Securities [Abstract]          
Securities weighted average term to maturity     15 years 4 months 24 days    
Available-for-sale Agency Securities [Abstract]          
Proceeds 0 0 $ 9,382 158,484  
Gross gains 0 0 98 1,370  
Tax expense on gain 0 0 31 440  
Gross losses 0 0 0 0  
Tax benefit on loss $ 0 $ 0 $ 0 $ 0  
[1] Amount includes periodic valuation gains or losses on marketable equity securities.