Shareholders' Equity (Details Textual) - Common Stock - Public Offering - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
Jun. 30, 2018	Sep. 30, 2017
Shareholders Equity [Line Items]
Number of shares issued	1,730,750	1,895,750
Proceeds from issuance	$ 54.3	$ 51.6
Price per share (in dollars per share)	$ 33.25	$ 29.00

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration