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Investment Securities Investment Securities-Schedule of Unealized Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 123 $ 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 14,084 20,851
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 374 1,141
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 34,344 43,766
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 497 1,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 48,428 64,617
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 6 87
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,216 8,752
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 6 87
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,216 8,752
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 29 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 3,424 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 241 851
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 14,598 26,787
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 270 851
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 18,022 26,787
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 6 87
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,216 8,752
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 6 87
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,216 8,752
US Government Agency Securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 94 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 10,660 20,851
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 131 213
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 17,736 12,002
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 225 236
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 28,396 32,853
Corporate Bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 77
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,010 4,977
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 2 77
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 2,010 $ 4,977