Covered Assets - Aging Analysis of Non-Credit Impaired Loans (Details) (Acquired Non Impaired Assets [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	$ 59,853	$ 100,161
Covered loans, current	56,161	98,342
Covered loans, 30 days	189	241
Covered loans, 60 days	2,068	40
Covered assets, 90 days	1,435	1,538
Total	3,692	1,819
% based on $	6.17%	1.82%
Single-Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	20,750	23,067
Covered loans, current	20,068	22,391
Covered loans, 30 days	122	230
Covered loans, 60 days	0	40
Covered assets, 90 days	560	406
Total	682	676
% based on $	3.29%	2.93%
Construction - Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	0	0
Covered loans, current	0	0
Covered loans, 30 days	0	0
Covered loans, 60 days	0	0
Covered assets, 90 days	0	0
Total	0	0
% based on $	0.00%	0.00%
Construction - Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	0	0
Covered loans, current	0	0
Covered loans, 30 days	0	0
Covered loans, 60 days	0	0
Covered assets, 90 days	0	0
Total	0	0
% based on $	0.00%	0.00%
Land - Acquisition & Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	349	1,364
Covered loans, current	349	1,328
Covered loans, 30 days	0	0
Covered loans, 60 days	0	0
Covered assets, 90 days	0	36
Total	0	36
% based on $	0.00%	2.64%
Land - Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	72	73
Covered loans, current	72	73
Covered loans, 30 days	0	0
Covered loans, 60 days	0	0
Covered assets, 90 days	0	0
Total	0	0
% based on $	0.00%	0.00%
Multi-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	903	6,598
Covered loans, current	903	6,598
Covered loans, 30 days	0	0
Covered loans, 60 days	0	0
Covered assets, 90 days	0	0
Total	0	0
% based on $	0.00%	0.00%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	22,967	51,336
Covered loans, current	22,092	50,240
Covered loans, 30 days	0	0
Covered loans, 60 days	0	0
Covered assets, 90 days	875	1,096
Total	875	1,096
% based on $	3.81%	2.13%
Commercial & Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	4,383	5,492
Covered loans, current	2,315	5,492
Covered loans, 30 days	0	0
Covered loans, 60 days	2,068	0
Covered assets, 90 days	0	0
Total	2,068	0
% based on $	47.18%	0.00%
HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	10,093	11,777
Covered loans, current	10,035	11,777
Covered loans, 30 days	58	0
Covered loans, 60 days	0	0
Covered assets, 90 days	0	0
Total	58	0
% based on $	0.57%	0.00%
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans	336	454
Covered loans, current	327	443
Covered loans, 30 days	9	11
Covered loans, 60 days	0	0
Covered assets, 90 days	0	0
Total	$ 9	$ 11
% based on $	2.68%	2.42%

Covered Assets - Aging Analysis of Non-Credit Impaired Loans (Details) (Acquired Non Impaired Assets [Member], USD $)
In Thousands, unless otherwise specified