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Investment Securities Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity $ 11,545 $ 12,075
Held-to-maturity, Gross Unrealized Gains 42 81
Held-to-maturity, Gross Unrealized Losses 361 247
Held-to-maturity, Fair Value 11,226 11,909
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 94,886 63,435
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 2,691 2,726
Available-for-sale, Fair Value 92,195 60,709
Government National Mortgage Association (GNMA)    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 1,288 1,434
Held-to-maturity, Gross Unrealized Gains 30 51
Held-to-maturity, Gross Unrealized Losses 0 0
Held-to-maturity, Fair Value 1,318 1,485
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 4,791 2,163
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 190 97
Available-for-sale, Fair Value 4,601 2,066
Federal Home Loan Mortgage Corporation (FHLMC)    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 15,830 6,633
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 397 283
Available-for-sale, Fair Value 15,433 6,350
Federal National Mortgage Association (FNMA)    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 9,257 9,641
Held-to-maturity, Gross Unrealized Gains 0 0
Held-to-maturity, Gross Unrealized Losses 361 247
Held-to-maturity, Fair Value 8,896 9,394
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 28,355 24,638
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 1,408 1,227
Available-for-sale, Fair Value 26,947 23,411
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 10,545 11,075
Held-to-maturity, Gross Unrealized Gains 30 51
Held-to-maturity, Gross Unrealized Losses 361 247
Held-to-maturity, Fair Value 10,214 10,879
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 48,976 33,434
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 1,995 1,607
Available-for-sale, Fair Value 46,981 31,827
US Government Agency Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 24,497 14,490
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 413 258
Available-for-sale, Fair Value 24,084 14,232
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 16,347  
Available-for-sale, Gross Unrealized Gains 0  
Available-for-sale, Gross Unrealized Losses 78  
Available-for-sale, Fair Value 16,269  
Corporate Bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 1,000 1,000
Held-to-maturity, Gross Unrealized Gains 12 30
Held-to-maturity, Gross Unrealized Losses 0 0
Held-to-maturity, Fair Value 1,012 1,030
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 5,066 5,078
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 205 212
Available-for-sale, Fair Value $ 4,861 4,866
Other investments    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost [1]   10,433
Available-for-sale, Gross Unrealized Gains [1]   0
Available-for-sale, Gross Unrealized Losses [1]   649
Available-for-sale, Fair Value [1]   $ 9,784
[1] (1) Primarily comprised of an investment in a CRA fund with 95% of its underlying investments consisting of government and agency-backed securities.