Investment Securities-Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	$ 10,317
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	10,460
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	32,225
Debt Securities, Available-for-sale, Amortized Cost	53,002
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	9,974
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	9,975
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	30,976
Debt Securities, Available-for-sale	$ 50,925
Debt Securities, Available-for-sale, Maturity, Weighted Average Yield [Abstract]
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Weighted Average Yield	1.68%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield	2.08%
Available-for-sale Securities, Debt Maturities, after Ten Years, Weighted Average Yield	2.35%
Available-for-sale Securities, Debt Maturities, Weighted Average Yield	2.17%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	$ 2,776
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	6,151
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	3,148
Debt Securities, Held-to-maturity	12,075	$ 13,435
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2,719
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	6,077
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	3,113
Debt Securities, Held-to-maturity, Fair Value	$ 11,909	$ 13,497
Debt Securities, Held-to-maturity, Maturity, Weighted Average Yield [Abstract]
Debt Securities, Held-to-maturity, Maturity, after One Through Five Years, Weighted Average Yield	2.41%
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield	3.03%
Held-to-maturity Securities, Debt Maturities, after Ten Years, Weighted Average Yield	2.61%
Held-to-maturity Securities, Debt Maturities, Weighted Average Yield	2.78%

Available-for-sale Securities, Debt Maturities, Weighted Average Rate

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