Non-interest Revenue Non-interest Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,327	$ 1,346	$ 3,710	$ 3,694
Noninterest income out of scope of ASU 606
Disaggregation of Revenue [Line Items]
Noninterest income	348	322	890	662
Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Noninterest income	979	1,024	2,820	3,032
Depository fees and charges | Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	862	817	2,549	2,563
Loan fees and service charges | Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	102	171	223	396
Other noninterest income | Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	$ 15	$ 36	$ 48	$ 73