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Derivatives and Hedging Activities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Derivative [Line Items]
Asset derivatives, fair value	$ 20,895	$ 11,879
Liability derivatives, fair value	55,554	27,400
Interest rate swap agreements
Derivative [Line Items]
Customer derivatives program	840,935	439,416
Notional amount	700,000	400,000
Interest rate contract | Other assets
Derivative [Line Items]
Asset derivatives, fair value	20,895	11,879
Interest rate contract | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	20,895	11,879
Commercial loan hedge
Derivative [Line Items]
Notional amount	54,155	54,815
Commercial loan hedge | Other assets
Derivative [Line Items]
Asset derivatives, fair value	0	0
Commercial loan hedge | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	3,312	966
Long term borrowing hedge | Other assets
Derivative [Line Items]
Asset derivatives, fair value	0	0
Long term borrowing hedge | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value	31,347	$ 14,555
Related Party Loan | Interest rate swap agreements
Derivative [Line Items]
Customer derivatives program	$ 34,432

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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