Allowance for Losses on Loans (Impaired Loans Based on Loan Types) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Sep. 30, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 521,739		$ 565,553
Unpaid Principal Balance	560,879		617,765
Related Allowance	30,724	[1]	41,628	[2]
Average Recorded Investment	522,689		471,396
Amount of related allowance included in specific reserves	11,686				15,983
Amount of related allowance included in general reserves	19,038				25,645
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	397,421		424,856
Unpaid Principal Balance	413,555		442,243
Related Allowance	19,073		25,723
Average Recorded Investment	399,984		354,874
Construction, Speculative [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	24,170		26,562
Unpaid Principal Balance	25,967		29,404
Related Allowance	2,093		2,981
Average Recorded Investment	24,656		26,403
Construction, Custom [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	568		0
Unpaid Principal Balance	568		0
Related Allowance	0		0
Average Recorded Investment	568		0
Land, Acquisition and Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	32,869		38,750
Unpaid Principal Balance	47,007		50,959
Related Allowance	5,959		8,901
Average Recorded Investment	34,438		38,067
Land, Consumer Lot Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	16,879		15,558
Unpaid Principal Balance	17,173		16,066
Related Allowance	746		761
Average Recorded Investment	16,785		13,613
Multi Family Housing [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	23,546		22,945
Unpaid Principal Balance	23,661		23,546
Related Allowance	2,245		2,462
Average Recorded Investment	22,901		21,214
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	21,217		34,912
Unpaid Principal Balance	22,558		46,378
Related Allowance	608		798
Average Recorded Investment	19,483		15,843
Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,164		1,146
Unpaid Principal Balance	8,469		7,365
Related Allowance	0		2
Average Recorded Investment	2,387		603
Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,904		824
Unpaid Principal Balance	1,904		1,800
Related Allowance	0		0
Average Recorded Investment	1,474		779
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1		0
Unpaid Principal Balance	17		4
Related Allowance	0		0
Average Recorded Investment	13		0
Financing Receivable, Impairment, No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	84,491		181,576
Unpaid Principal Balance	111,085		233,384
Related Allowance	0		0
Average Recorded Investment	82,248		100,507
Financing Receivable, Impairment, No Related Allowance [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	42,110		106,955
Unpaid Principal Balance	49,559		124,342
Related Allowance	0		0
Average Recorded Investment	43,478		49,524
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Speculative [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,637		13,726
Unpaid Principal Balance	5,529		16,568
Related Allowance	0		0
Average Recorded Investment	4,681		13,581
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Custom [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	568		0
Unpaid Principal Balance	568		0
Related Allowance	0		0
Average Recorded Investment	568		0
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Acquisition and Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,875		18,000
Unpaid Principal Balance	23,244		30,209
Related Allowance	0		0
Average Recorded Investment	12,020		16,417
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Consumer Lot Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,094		1,677
Unpaid Principal Balance	3,316		2,185
Related Allowance	0		0
Average Recorded Investment	2,982		487
Financing Receivable, Impairment, No Related Allowance [Member] | Multi Family Housing [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,022		8,792
Unpaid Principal Balance	5,022		8,991
Related Allowance	0		0
Average Recorded Investment	4,281		6,935
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	12,857		31,190
Unpaid Principal Balance	14,198		42,656
Related Allowance	0		0
Average Recorded Investment	11,101		12,946
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,164		1,146
Unpaid Principal Balance	8,469		7,363
Related Allowance	0		0
Average Recorded Investment	2,387		581
Financing Receivable, Impairment, No Related Allowance [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,163		90
Unpaid Principal Balance	1,163		1,066
Related Allowance	0		0
Average Recorded Investment	737		36
Financing Receivable, Impairment, No Related Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1		0
Unpaid Principal Balance	17		4
Related Allowance	0		0
Average Recorded Investment	13		0
Financing Receivable, Impairment, Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	437,248		383,977
Unpaid Principal Balance	449,794		384,381
Related Allowance	30,724	[1]	41,628	[2]
Average Recorded Investment	440,441		370,889
Financing Receivable, Impairment, Allowance Recorded [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	355,311		317,901
Unpaid Principal Balance	363,996		317,901
Related Allowance	19,073		25,723
Average Recorded Investment	356,506		305,350
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Speculative [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	19,533		12,836
Unpaid Principal Balance	20,438		12,836
Related Allowance	2,093		2,981
Average Recorded Investment	19,975		12,822
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Custom [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment	0		0
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Acquisition and Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	20,994		20,750
Unpaid Principal Balance	23,763		20,750
Related Allowance	5,959		8,901
Average Recorded Investment	22,418		21,650
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Consumer Lot Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,785		13,881
Unpaid Principal Balance	13,857		13,881
Related Allowance	746		761
Average Recorded Investment	13,803		13,126
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi Family Housing [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	18,524		14,153
Unpaid Principal Balance	18,639		14,555
Related Allowance	2,245		2,462
Average Recorded Investment	18,620		14,279
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	8,360		3,722
Unpaid Principal Balance	8,360		3,722
Related Allowance	608		798
Average Recorded Investment	8,382		2,897
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		2
Related Allowance	0		2
Average Recorded Investment	0		22
Financing Receivable, Impairment, Allowance Recorded [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	741		734
Unpaid Principal Balance	741		734
Related Allowance	0		0
Average Recorded Investment	737		743
Financing Receivable, Impairment, Allowance Recorded [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment	$ 0		$ 0

[1] Includes $11,686,000 of specific reserves and $19,038,000 included in the general reserves.

[2] Includes $15,983,000 of specific reserves and $25,645,000 included in the general reserves.