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INVESTMENT SECURITIES (Details 4) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 100,882 $ 111,145
Less than 12 months, Unrealized Losses (3,021) (2,696)
12 months or longer, Estimated Fair Value 96,860 100,060
12 months or longer, Unrealized Losses (4,156) (3,515)
Total, Estimated Fair Value 197,742 211,205
Total, Unrealized Losses (7,177) (6,211)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 6,595 6,626
Less than 12 months, Unrealized Losses (243) (236)
12 months or longer, Estimated Fair Value 2,100 2,106
12 months or longer, Unrealized Losses (65) (73)
Total, Estimated Fair Value 8,695 8,732
Total, Unrealized Losses (308) (309)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 4,282 5,301
Less than 12 months, Unrealized Losses (123) (112)
12 months or longer, Estimated Fair Value 10,808 15,797
12 months or longer, Unrealized Losses (189) (199)
Total, Estimated Fair Value 15,090 21,098
Total, Unrealized Losses (312) (311)
Real estate mortgage investment conduits    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 28,220 [1] 31,922 [2]
Less than 12 months, Unrealized Losses (876) [1] (774) [2]
12 months or longer, Estimated Fair Value 16,407 [1] 14,983 [2]
12 months or longer, Unrealized Losses (718) [1] (581) [2]
Total, Estimated Fair Value 44,627 [1] 46,905 [2]
Total, Unrealized Losses (1,594) [1] (1,355) [2]
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1] 48,120 50,941
Less than 12 months, Unrealized Losses [1] (1,415) (1,192)
12 months or longer, Estimated Fair Value [1] 36,251 37,823
12 months or longer, Unrealized Losses [1] (1,705) (1,523)
Total, Estimated Fair Value [1] 84,371 88,764
Total, Unrealized Losses [1] (3,120) (2,715)
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [3] 13,665 16,355
Less than 12 months, Unrealized Losses [3] (364) (382)
12 months or longer, Estimated Fair Value [3] 31,294 29,351
12 months or longer, Unrealized Losses [3] (1,479) (1,139)
Total, Estimated Fair Value [3] 44,959 45,706
Total, Unrealized Losses [3] $ (1,843) $ (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.