Loans - Summarizes Changes in Total Contractually Required Principal and Interest Cash Payments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$ 333,816
Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	8,717
Deletions	(999)
Accretion	96
Reclassifications from nonaccretable difference	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	7,750
Contractually required principal and interest [Member] \| Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	17,169
Deletions	(2,338)
Accretion	0
Reclassifications from nonaccretable difference	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	14,831
Non-accretable difference [Member] \| Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	(7,196)
Deletions	1,289
Accretion	0
Reclassifications from nonaccretable difference	82
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	(5,825)
Cash flows expected to be collected [Member] \| Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	9,973
Deletions	(1,049)
Accretion	0
Reclassifications from nonaccretable difference	82
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	9,006
Accretable yield [Member] \| Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	(1,256)
Deletions	50
Accretion	96
Reclassifications from nonaccretable difference	(82)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	(1,192)
Carrying value of acquired loans [Member] \| Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	8,717
Deletions	(999)
Accretion	96
Reclassifications from nonaccretable difference	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	7,814
Allowance for loan losses [Member] \| Purchased Credit Impaired Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	0
Additions	0
Deletions	0
Accretion	0
Reclassifications from nonaccretable difference	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	$ (64)

Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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- Definition

Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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- Definition

Amount of reduction, resulting from a sale or transfer of a loan, in the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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- Definition

Amount of reclassification (to) from nonaccretable difference (from) to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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