INVESTMENT SECURITIES: Temporarily Impaired Securities, Fair Value and Unrealized losses (Details 2) - USD ($) $ in Thousands		Mar. 31, 2018	Mar. 31, 2017
Available for sale:
Less than 12 months, Estimated Fair Value		$ 111,145	$ 161,967
Less than 12 months, Unrealized Losses		(2,696)	(2,754)
12 months or longer, Estimated Fair Value		100,060	3,442
12 months or longer, Unrealized Losses		(3,515)	(55)
Total, Estimated Fair Value		211,205	165,409
Total, Unrealized Losses		(6,211)	(2,809)
Municipal securities
Available for sale:
Less than 12 months, Estimated Fair Value		6,626	2,819
Less than 12 months, Unrealized Losses		(236)	(117)
12 months or longer, Estimated Fair Value		2,106	0
12 months or longer, Unrealized Losses		(73)	0
Total, Estimated Fair Value		8,732	2,819
Total, Unrealized Losses		(309)	(117)
Agency securities
Available for sale:
Less than 12 months, Estimated Fair Value		5,301	15,785
Less than 12 months, Unrealized Losses		(112)	(203)
12 months or longer, Estimated Fair Value		15,797	0
12 months or longer, Unrealized Losses		(199)	0
Total, Estimated Fair Value		21,098	15,785
Total, Unrealized Losses		(311)	(203)
Real estate mortgage investment conduits
Available for sale:
Less than 12 months, Estimated Fair Value	[1]	31,922	32,221
Less than 12 months, Unrealized Losses	[1]	(774)	(399)
12 months or longer, Estimated Fair Value	[1]	14,983	0
12 months or longer, Unrealized Losses	[1]	(581)	0
Total, Estimated Fair Value	[1]	46,905	32,221
Total, Unrealized Losses	[1]	(1,355)	(399)
Residential mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value	[2]	50,941	74,388
Less than 12 months, Unrealized Losses	[2]	(1,192)	(1,232)
12 months or longer, Estimated Fair Value	[2]	37,823	602
12 months or longer, Unrealized Losses	[2]	(1,523)	(10)
Total, Estimated Fair Value	[2]	88,764	74,990
Total, Unrealized Losses	[2]	(2,715)	(1,242)
Other mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value	[3]	16,355	36,754
Less than 12 months, Unrealized Losses	[3]	(382)	(803)
12 months or longer, Estimated Fair Value	[3]	29,351	2,840
12 months or longer, Unrealized Losses	[3]	(1,139)	(45)
Total, Estimated Fair Value	[3]	45,706	39,594
Total, Unrealized Losses	[3]	$ (1,521)	$ (848)

[1] Comprised of FHLMC and FNMA issued securities.

[2] Comprised of FHLMC, FNMA and GNMA issued securities.

[3] Comprised of SBA and CRE secured securities issued by FNMA.