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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 48,725 $ 0
Less than 12 months, Unrealized Losses (415) 0
12 months or longer, Estimated Fair Value 39,444 168,238
12 months or longer, Unrealized Losses (446) (3,526)
Total, Estimated Fair Value 88,169 168,238
Total, Unrealized Losses (861) (3,526)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 0 0
Less than 12 months, Unrealized Losses 0 0
12 months or longer, Estimated Fair Value 0 6,554
12 months or longer, Unrealized Losses 0 (34)
Total, Estimated Fair Value 0 6,554
Total, Unrealized Losses 0 (34)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 1,998 0
Less than 12 months, Unrealized Losses (11) 0
12 months or longer, Estimated Fair Value 2,969 6,861
12 months or longer, Unrealized Losses (30) (107)
Total, Estimated Fair Value 4,967 6,861
Total, Unrealized Losses (41) (107)
Real estate mortgage investment conduits    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 22,033 0
Less than 12 months, Unrealized Losses [1] (140) 0
12 months or longer, Estimated Fair Value [1] 2,850 40,126
12 months or longer, Unrealized Losses [1] (18) (673)
Total, Estimated Fair Value [1] 24,883 40,126
Total, Unrealized Losses [1] (158) (673)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 8,707 0
Less than 12 months, Unrealized Losses [1] (18) 0
12 months or longer, Estimated Fair Value [1] 25,116 74,288
12 months or longer, Unrealized Losses [1] (238) (1,588)
Total, Estimated Fair Value [1] 33,823 74,288
Total, Unrealized Losses [1] (256) (1,588)
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [2] 15,987 0
Less than 12 months, Unrealized Losses [2] (246) 0
12 months or longer, Estimated Fair Value [2] 8,509 40,409
12 months or longer, Unrealized Losses [2] (160) (1,124)
Total, Estimated Fair Value [2] 24,496 40,409
Total, Unrealized Losses [2] $ (406) $ (1,124)
[1] Comprised of FHLMC, FNMA and GNMA issued securities.
[2] Comprised of SBA issued securities and CRE secured securities issued by FNMA.