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INVESTMENT SECURITIES: Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Available for sale:    
Less than 12 months, Estimated Fair Value $ 162,895 $ 161,967
Less than 12 months, Unrealized Losses (2,215) (2,754)
12 months or longer, Estimated Fair Value 3,361 3,442
12 months or longer, Unrealized Losses (29) (55)
Total, Estimated Fair Value 166,256 165,409
Total, Unrealized Losses (2,244) (2,809)
Municipal securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 5,170 2,819
Less than 12 months, Unrealized Losses (48) (117)
12 months or longer, Estimated Fair Value
12 months or longer, Unrealized Losses
Total, Estimated Fair Value 5,170 2,819
Total, Unrealized Losses (48) (117)
Agency securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 21,216 15,785
Less than 12 months, Unrealized Losses (179) (203)
12 months or longer, Estimated Fair Value
12 months or longer, Unrealized Losses
Total, Estimated Fair Value 21,216 15,785
Total, Unrealized Losses (179) (203)
Real estate mortgage investment conduits    
Available for sale:    
Less than 12 months, Estimated Fair Value [1] 29,606 32,221
Less than 12 months, Unrealized Losses [1] (284) (399)
12 months or longer, Estimated Fair Value [1]
12 months or longer, Unrealized Losses [1]
Total, Estimated Fair Value [1] 29,606 32,221
Total, Unrealized Losses [1] (284) (399)
Residential mortgage-backed securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 72,615 [1] 74,388 [2]
Less than 12 months, Unrealized Losses (988) [1] (1,232) [2]
12 months or longer, Estimated Fair Value 556 [1] 602 [2]
12 months or longer, Unrealized Losses (6) [1] (10) [2]
Total, Estimated Fair Value 73,171 [1] 74,990 [2]
Total, Unrealized Losses (994) [1] (1,242) [2]
Other mortgage-backed securities    
Available for sale:    
Less than 12 months, Estimated Fair Value 34,288 [2] 36,754 [3]
Less than 12 months, Unrealized Losses (716) [2] (803) [3]
12 months or longer, Estimated Fair Value 2,805 [2] 2,840 [3]
12 months or longer, Unrealized Losses (23) [2] (45) [3]
Total, Estimated Fair Value 37,093 [2] 39,594 [3]
Total, Unrealized Losses $ (739) [2] $ (848) [3]
[1] Comprised of FHLMC and FNMA issued securities.
[2] Comprised of FHLMC, FNMA and GNMA issued securities.
[3] Comprised of SBA issued and CRE secured securities issued by FNMA.