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Investment Securities Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity [1] $ 13,094 $ 13,435
Held-to-maturity, Gross Unrealized Gains [1] 162 122
Held-to-maturity, Gross Unrealized Losses [1] 35 60
Held-to-maturity, Fair Value [1] 13,221 13,497
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 59,671 60,951
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 1,564 1,940
Available-for-sale, Fair Value 58,107 59,011
Government National Mortgage Association (GNMA)    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 2,326 2,576
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 42 89
Available-for-sale, Fair Value 2,284 2,487
Federal Home Loan Mortgage Corporation (FHLMC)    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 7,680 8,053
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 159 195
Available-for-sale, Fair Value 7,521 7,858
Federal National Mortgage Association (FNMA)    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 26,594 27,241
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 727 928
Available-for-sale, Fair Value 25,867 26,313
Mortgage Backed Securities, Other    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 45 45
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 0 0
Available-for-sale, Fair Value 45 45
Mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 36,645 37,915
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 928 1,212
Available-for-sale, Fair Value 35,717 36,703
US Government Agency Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 7,571 7,574
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 87 92
Available-for-sale, Fair Value 7,484 7,482
Corporate Bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 5,097 5,104
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 107 140
Available-for-sale, Fair Value 4,990 4,964
Other investments    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, Amortized Cost 10,358 [2] 10,358 [3]
Available-for-sale, Gross Unrealized Gains 0 [2] 0 [3]
Available-for-sale, Gross Unrealized Losses 442 [2] 496 [3]
Available-for-sale, Fair Value 9,916 [2] 9,862 [3]
Government National Mortgage Association (GNMA)    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity [1] 1,722 1,797
Held-to-maturity, Gross Unrealized Gains [1] 90 86
Held-to-maturity, Gross Unrealized Losses [1] 0 0
Held-to-maturity, Fair Value [1] 1,812 1,883
Federal National Mortgage Association (FNMA)    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity [1] 10,372 10,638
Held-to-maturity, Gross Unrealized Gains [1] 43 12
Held-to-maturity, Gross Unrealized Losses [1] 35 60
Held-to-maturity, Fair Value [1] 10,380 10,590
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity [1] 12,094 12,435
Held-to-maturity, Gross Unrealized Gains [1] 133 98
Held-to-maturity, Gross Unrealized Losses [1] 35 60
Held-to-maturity, Fair Value [1] 12,192 12,473
Corporate Bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity [1] 1,000 1,000
Held-to-maturity, Gross Unrealized Gains [1] 29 24
Held-to-maturity, Gross Unrealized Losses [1] 0 0
Held-to-maturity, Fair Value [1] $ 1,029 $ 1,024
[1] * The carrying amount and amortized cost are the same for all held-to-maturity securities, as no OTTI has been recorded.
[2] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.
[3] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.