Non-interest Revenue Non-interest Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,304	$ 1,209
Noninterest income out of scope of ASU 606
Disaggregation of Revenue [Line Items]
Noninterest income	399	206
Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Noninterest income	905	1,003
Depository fees and charges \| Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	833	895
Loan fees and service charges \| Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	55	98
Other noninterest income \| Noninterest income in scope of ASU 606
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer	$ 17	$ 10

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration