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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Agency Notes [Member]    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months $ 5,121 $ 5,100
12 Consecutive Months or Longer 0 0
Total 5,121 5,100
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 3 10
12 Consecutive Months or Longer 0 0
Total 3 10
Corporate Securities [Member]    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 10,104 11,135
12 Consecutive Months or Longer 0 0
Total 10,104 11,135
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 64 32
12 Consecutive Months or Longer 0 0
Total 64 32
Pass-through MBS Issued by GSEs [Member]    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 0 216,451
12 Consecutive Months or Longer 81,834 45,489
Total 81,834 261,940
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 0 1,049
12 Consecutive Months or Longer 560 951
Total 560 2,000
Agency CMOs [Member]    
Securities available-for-sale, Fair Value [Abstract]    
Less than 12 Consecutive Months 86,626 52,605
12 Consecutive Months or Longer 4,583 39,833
Total 91,209 92,438
Securities available-for-sale, Unrealized Losses [Abstract]    
Less than 12 Consecutive Months 716 439
12 Consecutive Months or Longer 60 1,196
Total $ 776 $ 1,635