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INVESTMENT SECURITIES: Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Available for sale:    
Less than 12 months, Estimated Fair Value $ 107,068 $ 161,967
Less than 12 months, Unrealized Losses (939) (2,754)
12 months or longer, Estimated Fair Value 104,564 3,442
12 months or longer, Unrealized Losses (2,230) (55)
Total, Estimated Fair Value 211,632 165,409
Total, Unrealized Losses (3,169) (2,809)
Municipal securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 5,471 2,819
Less than 12 months, Unrealized Losses (52) (117)
12 months or longer, Estimated Fair Value 2,176 0
12 months or longer, Unrealized Losses (16) 0
Total, Estimated Fair Value 7,647 2,819
Total, Unrealized Losses (68) (117)
Agency securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 5,369 15,785
Less than 12 months, Unrealized Losses (41) (203)
12 months or longer, Estimated Fair Value 15,832 0
12 months or longer, Unrealized Losses (161) 0
Total, Estimated Fair Value 21,201 15,785
Total, Unrealized Losses (202) (203)
Real estate mortgage investment conduits    
Available for sale:    
Less than 12 months, Estimated Fair Value 31,252 [1] 32,221 [2]
Less than 12 months, Unrealized Losses (358) [1] (399) [2]
12 months or longer, Estimated Fair Value 15,643 [1] 0 [2]
12 months or longer, Unrealized Losses (396) [1] 0 [2]
Total, Estimated Fair Value 46,895 [1] 32,221 [2]
Total, Unrealized Losses (754) [1] (399) [2]
Residential mortgage-backed securities    
Available for sale:    
Less than 12 months, Estimated Fair Value [1] 48,645 74,388
Less than 12 months, Unrealized Losses [1] (315) (1,232)
12 months or longer, Estimated Fair Value [1] 40,262 602
12 months or longer, Unrealized Losses [1] (869) (10)
Total, Estimated Fair Value [1] 88,907 74,990
Total, Unrealized Losses [1] (1,184) (1,242)
Other mortgage-backed securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 16,331 [3] 36,754 [4]
Less than 12 months, Unrealized Losses (173) [3] (803) [4]
12 months or longer, Estimated Fair Value 30,651 [3] 2,840 [4]
12 months or longer, Unrealized Losses (788) [3] (45) [4]
Total, Estimated Fair Value 46,982 [3] 39,594 [4]
Total, Unrealized Losses $ (961) [3] $ (848) [4]
[1] Comprised of FHLMC, FNMA and GNMA issued securities.
[2] Comprised of FHLMC and FNMA issued securities.
[3] Comprised of SBA and CRE secured securities issued by FHLMC.
[4] Comprised of SBA issued and CRE secured securities issued by FNMA.