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Investment Securities Investment Securities-Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity $ 11,844 $ 12,075
Held-to-maturity, Gross Unrealized Gains 73 81
Held-to-maturity, Gross Unrealized Losses 314 247
Held-to-maturity, Fair Value 11,603 11,909
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 68,171 63,435
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 2,343 2,726
Available-for-sale, Fair Value 65,828 60,709
Government National Mortgage Association (GNMA)    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 1,359 1,434
Held-to-maturity, Gross Unrealized Gains 52 51
Held-to-maturity, Gross Unrealized Losses 0 0
Held-to-maturity, Fair Value 1,411 1,485
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 2,107 2,163
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 113 97
Available-for-sale, Fair Value 1,994 2,066
Federal Home Loan Mortgage Corporation (FHLMC)    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 6,335 6,633
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 291 283
Available-for-sale, Fair Value 6,044 6,350
Federal National Mortgage Association (FNMA)    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 9,485 9,641
Held-to-maturity, Gross Unrealized Gains 0 0
Held-to-maturity, Gross Unrealized Losses 314 247
Held-to-maturity, Fair Value 9,171 9,394
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 23,921 24,638
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 1,319 1,227
Available-for-sale, Fair Value 22,602 23,411
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 10,844 11,075
Held-to-maturity, Gross Unrealized Gains 52 51
Held-to-maturity, Gross Unrealized Losses 314 247
Held-to-maturity, Fair Value 10,582 10,879
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 32,363 33,434
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 1,723 1,607
Available-for-sale, Fair Value 30,640 31,827
US Government Agency Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 14,418 14,490
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 351 258
Available-for-sale, Fair Value 14,067 14,232
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 16,318  
Available-for-sale, Gross Unrealized Gains 0  
Available-for-sale, Gross Unrealized Losses 46  
Available-for-sale, Fair Value 16,272  
Corporate Bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity 1,000 1,000
Held-to-maturity, Gross Unrealized Gains 21 30
Held-to-maturity, Gross Unrealized Losses 0 0
Held-to-maturity, Fair Value 1,021 1,030
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, Amortized Cost 5,072 5,078
Available-for-sale, Gross Unrealized Gains 0 0
Available-for-sale, Gross Unrealized Losses 223 212
Available-for-sale, Fair Value $ 4,849 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.