Covered Assets and Indemnification Asset (Details 4) (Covered, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2014 item
Covered Loans
Total Modifications	$ 853
Recorded Investment in loans
Number of loans	1	0
Recorded Investment	280
Payment Term Extension
Covered Loans
Total Modifications	853
Secured by commercial properties
Covered Loans
Total Modifications	573
Recorded Investment in loans
Number of loans	1
Recorded Investment	280
Secured by commercial properties | Payment Term Extension
Covered Loans
Total Modifications	573
Secured by residential properties
Covered Loans
Total Modifications	280
Secured by residential properties | Payment Term Extension
Covered Loans
Total Modifications	$ 280