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INVESTMENT SECURITIES (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 9,480 $ 111,145
Less than 12 months, Unrealized Losses (132) (2,696)
12 months or longer, Estimated Fair Value 168,775 100,060
12 months or longer, Unrealized Losses (5,519) (3,515)
Total, Estimated Fair Value 178,255 211,205
Total, Unrealized Losses (5,651) (6,211)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 1,103 6,626
Less than 12 months, Unrealized Losses (41) (236)
12 months or longer, Estimated Fair Value 6,415 2,106
12 months or longer, Unrealized Losses (206) (73)
Total, Estimated Fair Value 7,518 8,732
Total, Unrealized Losses (247) (309)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 1,001 5,301
Less than 12 months, Unrealized Losses (2) (112)
12 months or longer, Estimated Fair Value 9,164 15,797
12 months or longer, Unrealized Losses (244) (199)
Total, Estimated Fair Value 10,165 21,098
Total, Unrealized Losses (246) (311)
Real estate mortgage investment conduits    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 2,126 [1] 31,922 [2]
Less than 12 months, Unrealized Losses (11) [1] (774) [2]
12 months or longer, Estimated Fair Value 39,284 [1] 14,983 [2]
12 months or longer, Unrealized Losses (1,100) [1] (581) [2]
Total, Estimated Fair Value 41,410 [1] 46,905 [2]
Total, Unrealized Losses (1,111) [1] (1,355) [2]
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 4,273 50,941
Less than 12 months, Unrealized Losses [1] (64) (1,192)
12 months or longer, Estimated Fair Value [1] 73,365 37,823
12 months or longer, Unrealized Losses [1] (2,501) (1,523)
Total, Estimated Fair Value [1] 77,638 88,764
Total, Unrealized Losses [1] (2,565) (2,715)
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [3] 977 16,355
Less than 12 months, Unrealized Losses [3] (14) (382)
12 months or longer, Estimated Fair Value [3] 40,547 29,351
12 months or longer, Unrealized Losses [3] (1,468) (1,139)
Total, Estimated Fair Value [3] 41,524 45,706
Total, Unrealized Losses [3] $ (1,482) $ (1,521)
[1] Comprised of FHLMC, FNMA and GNMA issued securities
[2] Comprised of FHLMC and FNMA issued securities.
[3] Comprised of SBA issued and CRE secured securities issued by FNMA.