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INVESTMENT SECURITIES (Details 4) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 0 $ 111,145
Less than 12 months, Unrealized Losses 0 (2,696)
12 months or longer, Estimated Fair Value 168,238 100,060
12 months or longer, Unrealized Losses (3,526) (3,515)
Total, Estimated Fair Value 168,238 211,205
Total, Unrealized Losses (3,526) (6,211)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 0 6,626
Less than 12 months, Unrealized Losses 0 (236)
12 months or longer, Estimated Fair Value 6,554 2,106
12 months or longer, Unrealized Losses (34) (73)
Total, Estimated Fair Value 6,554 8,732
Total, Unrealized Losses (34) (309)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 0 5,301
Less than 12 months, Unrealized Losses 0 (112)
12 months or longer, Estimated Fair Value 6,861 15,797
12 months or longer, Unrealized Losses (107) (199)
Total, Estimated Fair Value 6,861 21,098
Total, Unrealized Losses (107) (311)
Real estate mortgage investment conduits    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 0 31,922
Less than 12 months, Unrealized Losses 0 (774)
12 months or longer, Estimated Fair Value 40,126 14,983
12 months or longer, Unrealized Losses (673) (581)
Total, Estimated Fair Value 40,126 46,905
Total, Unrealized Losses (673) (1,355)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 0 50,941
Less than 12 months, Unrealized Losses [1] 0 (1,192)
12 months or longer, Estimated Fair Value [1] 74,288 37,823
12 months or longer, Unrealized Losses [1] (1,588) (1,523)
Total, Estimated Fair Value [1] 74,288 88,764
Total, Unrealized Losses [1] (1,588) (2,715)
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [2] 0 16,355
Less than 12 months, Unrealized Losses [2] 0 (382)
12 months or longer, Estimated Fair Value [2] 40,409 29,351
12 months or longer, Unrealized Losses [2] (1,124) (1,139)
Total, Estimated Fair Value [2] 40,409 45,706
Total, Unrealized Losses [2] $ (1,124) $ (1,521)
[1] Comprised of FHLMC, FNMA and GNMA issued securities.
[2] Comprised of SBA and CRE secured securities issued by FNMA.