Covered Assets (Aging Analysis of Non-Credit Impaired Loans) (Details) (Acquired Non Impaired Assets [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	$ 211,779	$ 228,843
Loans and Leases Receivable, Covered Loans, Current	199,695	212,210
Loans and Leases Receivable, Covered Loans, 30 Days	841	2,189
Loans and Leases Receivable, Covered Loans, 60 Days	37	4,567
Loans and Leases Receivable, Covered Assets, 90 Days	11,206	9,877
Loans and Leases Receivable, Covered Assets, Past Due	12,084	16,633
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	5.71%	7.27%
Single Family Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	34,645	35,676
Loans and Leases Receivable, Covered Loans, Current	31,887	32,601
Loans and Leases Receivable, Covered Loans, 30 Days	50	2,075
Loans and Leases Receivable, Covered Loans, 60 Days	0	0
Loans and Leases Receivable, Covered Assets, 90 Days	2,708	1,000
Loans and Leases Receivable, Covered Assets, Past Due	2,758	3,075
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	7.96%	8.62%
Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	102	90
Loans and Leases Receivable, Covered Loans, Current	102	90
Loans and Leases Receivable, Covered Loans, 30 Days	0	0
Loans and Leases Receivable, Covered Loans, 60 Days	0	0
Loans and Leases Receivable, Covered Assets, 90 Days	0	0
Loans and Leases Receivable, Covered Assets, Past Due	0	0
Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	0	0
Loans and Leases Receivable, Covered Loans, Current	0	0
Loans and Leases Receivable, Covered Loans, 30 Days	0	0
Loans and Leases Receivable, Covered Loans, 60 Days	0	0
Loans and Leases Receivable, Covered Assets, 90 Days	0	0
Loans and Leases Receivable, Covered Assets, Past Due	0	0
Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	10,868	11,430
Loans and Leases Receivable, Covered Loans, Current	9,495	9,922
Loans and Leases Receivable, Covered Loans, 30 Days	0	0
Loans and Leases Receivable, Covered Loans, 60 Days	36	0
Loans and Leases Receivable, Covered Assets, 90 Days	1,337	1,508
Loans and Leases Receivable, Covered Assets, Past Due	1,373	1,508
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	12.63%	13.19%
Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	443	498
Loans and Leases Receivable, Covered Loans, Current	345	385
Loans and Leases Receivable, Covered Loans, 30 Days	0	0
Loans and Leases Receivable, Covered Loans, 60 Days	0	0
Loans and Leases Receivable, Covered Assets, 90 Days	98	113
Loans and Leases Receivable, Covered Assets, Past Due	98	113
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	22.12%	22.69%
Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	26,642	27,645
Loans and Leases Receivable, Covered Loans, Current	24,934	26,137
Loans and Leases Receivable, Covered Loans, 30 Days	200	0
Loans and Leases Receivable, Covered Loans, 60 Days	0	0
Loans and Leases Receivable, Covered Assets, 90 Days	1,508	1,508
Loans and Leases Receivable, Covered Assets, Past Due	1,708	1,508
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	6.41%	5.45%
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	109,792	121,592
Loans and Leases Receivable, Covered Loans, Current	107,753	115,206
Loans and Leases Receivable, Covered Loans, 30 Days	192	17
Loans and Leases Receivable, Covered Loans, 60 Days	0	4,447
Loans and Leases Receivable, Covered Assets, 90 Days	1,847	1,922
Loans and Leases Receivable, Covered Assets, Past Due	2,039	6,386
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	1.86%	5.25%
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	12,010	13,023
Loans and Leases Receivable, Covered Loans, Current	8,213	9,513
Loans and Leases Receivable, Covered Loans, 30 Days	369	0
Loans and Leases Receivable, Covered Loans, 60 Days	0	69
Loans and Leases Receivable, Covered Assets, 90 Days	3,428	3,441
Loans and Leases Receivable, Covered Assets, Past Due	3,797	3,510
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	31.62%	26.95%
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	16,556	17,971
Loans and Leases Receivable, Covered Loans, Current	16,247	17,440
Loans and Leases Receivable, Covered Loans, 30 Days	29	97
Loans and Leases Receivable, Covered Loans, 60 Days	0	50
Loans and Leases Receivable, Covered Assets, 90 Days	280	384
Loans and Leases Receivable, Covered Assets, Past Due	309	531
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	1.87%	2.95%
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal balance of acquired loans	721	918
Loans and Leases Receivable, Covered Loans, Current	719	916
Loans and Leases Receivable, Covered Loans, 30 Days	1	0
Loans and Leases Receivable, Covered Loans, 60 Days	1	1
Loans and Leases Receivable, Covered Assets, 90 Days	0	1
Loans and Leases Receivable, Covered Assets, Past Due	$ 2	$ 2
Loans and Leases Receivable, Covered Loans, Ratio of Total Past Due Loans to Total Loans Receivable, Net of Charge Offs and Loans in Process	0.28%	2.20%