Allowance for Losses on Loans (Impaired Loans Based on Loan Types) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 462,400	$ 454,557
Unpaid Principal Balance	505,281	510,623
Related Allowance	16,565	18,610
Average Recorded Investment	451,647	425,267
Amount of related allowance included in specific reserves	835	3,473
Amount of related allowance included in general reserves	15,730	15,137
Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	60,630	80,772
Unpaid Principal Balance	95,206	126,674
Related Allowance	0	0
Average Recorded Investment	50,822	43,952
Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	401,770	373,785
Unpaid Principal Balance	410,075	383,949
Related Allowance	16,565	18,610
Average Recorded Investment	400,825	381,315
Single-Family Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	375,113	369,023
Unpaid Principal Balance	384,688	380,838
Related Allowance	15,730	15,137
Average Recorded Investment	371,742	351,865
Single-Family Residential [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,196	33,883
Unpaid Principal Balance	29,644	38,928
Related Allowance	0	0
Average Recorded Investment	23,970	21,458
Single-Family Residential [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	348,917	335,140
Unpaid Principal Balance	355,044	341,910
Related Allowance	15,730	15,137
Average Recorded Investment	347,772	330,407
Construction - Speculative [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,382	12,783
Unpaid Principal Balance	12,435	13,441
Related Allowance	60	1,100
Average Recorded Investment	11,618	15,701
Construction - Speculative [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,769	3,891
Unpaid Principal Balance	2,392	4,099
Related Allowance	0	0
Average Recorded Investment	1,993	3,339
Construction - Speculative [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,613	8,892
Unpaid Principal Balance	10,043	9,342
Related Allowance	60	1,100
Average Recorded Investment	9,625	12,362
Construction - Custom [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,461	0
Unpaid Principal Balance	1,461	0
Related Allowance	0	0
Average Recorded Investment	1,329	0
Construction - Custom [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	265	0
Unpaid Principal Balance	265	0
Related Allowance	0	0
Average Recorded Investment	133	0
Construction - Custom [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,196	0
Unpaid Principal Balance	1,196	0
Related Allowance	0	0
Average Recorded Investment	1,196	0
Land - Acquisition & Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,137	5,618
Unpaid Principal Balance	15,429	14,707
Related Allowance	775	0
Average Recorded Investment	7,387	10,863
Land - Acquisition & Development [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,973	3,020
Unpaid Principal Balance	9,325	10,705
Related Allowance	0	0
Average Recorded Investment	2,085	2,548
Land - Acquisition & Development [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,164	2,598
Unpaid Principal Balance	6,104	4,002
Related Allowance	775	0
Average Recorded Investment	5,302	8,315
Land - Consumer Lot Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	15,509	15,817
Unpaid Principal Balance	15,990	16,390
Related Allowance	0	2,222
Average Recorded Investment	15,566	14,140
Land - Consumer Lot Loans [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,239	3,186
Unpaid Principal Balance	2,337	3,376
Related Allowance	0	0
Average Recorded Investment	2,261	1,839
Land - Consumer Lot Loans [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,270	12,631
Unpaid Principal Balance	13,653	13,014
Related Allowance	0	2,222
Average Recorded Investment	13,305	12,301
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,991	10,887
Unpaid Principal Balance	9,252	11,107
Related Allowance	0	46
Average Recorded Investment	8,560	9,465
Multi-Family [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,264	4,929
Unpaid Principal Balance	1,305	4,929
Related Allowance	0	0
Average Recorded Investment	816	1,734
Multi-Family [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,727	5,958
Unpaid Principal Balance	7,947	6,178
Related Allowance	0	46
Average Recorded Investment	7,744	7,731
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	36,955	31,076
Unpaid Principal Balance	39,891	40,352
Related Allowance	0	105
Average Recorded Investment	29,587	18,972
Commercial Real Estate [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	22,498	23,537
Unpaid Principal Balance	25,229	31,876
Related Allowance	0	0
Average Recorded Investment	15,076	9,651
Commercial Real Estate [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	14,457	7,539
Unpaid Principal Balance	14,662	8,476
Related Allowance	0	105
Average Recorded Investment	14,511	9,321
Commercial & Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,874	7,335
Unpaid Principal Balance	23,768	31,253
Related Allowance	0	0
Average Recorded Investment	3,935	3,134
Commercial & Industrial [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,843	7,279
Unpaid Principal Balance	23,737	31,197
Related Allowance	0	0
Average Recorded Investment	3,897	3,123
Commercial & Industrial [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	31	56
Unpaid Principal Balance	31	56
Related Allowance	0	0
Average Recorded Investment	38	11
HELOC [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,460	1,384
Unpaid Principal Balance	1,794	1,884
Related Allowance	0	0
Average Recorded Investment	1,460	991
HELOC [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	262	446
Unpaid Principal Balance	596	946
Related Allowance	0	0
Average Recorded Investment	262	133
HELOC [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,198	938
Unpaid Principal Balance	1,198	938
Related Allowance	0	0
Average Recorded Investment	1,198	858
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	518	634
Unpaid Principal Balance	573	651
Related Allowance	0	0
Average Recorded Investment	463	136
Consumer [Member] \| Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	321	601
Unpaid Principal Balance	376	618
Related Allowance	0	0
Average Recorded Investment	329	127
Consumer [Member] \| Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	197	33
Unpaid Principal Balance	197	33
Related Allowance	0	0
Average Recorded Investment	$ 134	$ 9