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INVESTMENT SECURITIES (Details 4) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 65,960 $ 111,145
Less than 12 months, Unrealized Losses (2,334) (2,696)
12 months or longer, Estimated Fair Value 122,537 100,060
12 months or longer, Unrealized Losses (6,173) (3,515)
Total, Estimated Fair Value 188,497 211,205
Total, Unrealized Losses (8,507) (6,211)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 5,293 6,626
Less than 12 months, Unrealized Losses (289) (236)
12 months or longer, Estimated Fair Value 3,281 2,106
12 months or longer, Unrealized Losses (101) (73)
Total, Estimated Fair Value 8,574 8,732
Total, Unrealized Losses (390) (309)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 995 5,301
Less than 12 months, Unrealized Losses (9) (112)
12 months or longer, Estimated Fair Value 13,999 15,797
12 months or longer, Unrealized Losses (403) (199)
Total, Estimated Fair Value 14,994 21,098
Total, Unrealized Losses (412) (311)
Real estate mortgage investment conduits    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 20,660 31,922
Less than 12 months, Unrealized Losses [1] (759) (774)
12 months or longer, Estimated Fair Value [1] 21,546 14,983
12 months or longer, Unrealized Losses [1] (1,101) (581)
Total, Estimated Fair Value [1] 42,206 46,905
Total, Unrealized Losses [1] (1,860) (1,355)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [2] 28,498 50,941
Less than 12 months, Unrealized Losses [2] (1,018) (1,192)
12 months or longer, Estimated Fair Value [2] 51,415 37,823
12 months or longer, Unrealized Losses [2] (2,703) (1,523)
Total, Estimated Fair Value [2] 79,913 88,764
Total, Unrealized Losses [2] (3,721) (2,715)
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [3] 10,514 16,355
Less than 12 months, Unrealized Losses [3] (259) (382)
12 months or longer, Estimated Fair Value [3] 32,296 29,351
12 months or longer, Unrealized Losses [3] (1,865) (1,139)
Total, Estimated Fair Value [3] 42,810 45,706
Total, Unrealized Losses [3] $ (2,124) $ (1,521)
[1] Comprised of FHLMC and FNMA issued securities.
[2] Comprised of FHLMC, FNMA and GNMA issued securities.
[3] Comprised of SBA issued and CRE secured securities issued by FNMA.