Allowance for Loan Losses Schedule of Defaulted Troubled Debt Restructuring (Details) $ in Thousands	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	7	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,822	$ 603
Credit Card Receivable
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 23	$ 0
Credit Card Receivable | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 23	$ 0
Commercial and Industrial
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,691	$ 115
Commercial and Industrial | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,691	$ 115
Commercial and Industrial | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial and Industrial | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial Real Estate
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 328
Commercial Real Estate | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 328
Commercial Real Estate | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial Real Estate | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Construction Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Construction Loans | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Construction Loans | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Construction Loans | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial Loan
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,691	$ 443
Commercial Loan | Originated Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1,691	$ 443
Commercial Loan | Covered Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Commercial Loan | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Consumer Installment
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 26	$ 99
Consumer Installment | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 26	$ 22
Consumer Installment | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 77
Home Equity Line of Credit
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 61
Home Equity Line of Credit | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Home Equity Line of Credit | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 61
Residential Mortgages
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 82	$ 0
Residential Mortgages | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 82	$ 0
Residential Mortgages | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0
Total consumer
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	6	6
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 131	$ 160
Total consumer | Originated Consumer Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	6	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 131	$ 22
Total consumer | Acquired Loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Financing receivable, modifications, subsequent default, number of contracts at period end	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 138