Loans Receivable (excluding Covered Loans) (Loans Receivable, Analysis of Age of Loans in Past Due Status) (Details) (USD $)
In Thousands, unless otherwise specified

Loans Receivable (excluding Covered Loans) (Loans Receivable, Analysis of Age of Loans in Past Due Status) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	7,823,968	$ 8,128,845
Current	7,603,445	7,849,623
30 Days	41,843	59,026
60 Days	28,057	25,577
90 Days	150,623	194,619
Total	220,523	279,222
Ratio of past due loans to total loans, net of charge-offs and LIPs	2.82%	3.43%
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		6,217,670
Current		6,015,464
30 Days		54,140
60 Days		21,985
90 Days		126,082
Total		202,207
Ratio of past due loans to total loans, net of charge-offs and LIPs	2.81%	3.25%	3.43%
Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		115,409
Current		106,843
30 Days		330
60 Days		0
90 Days		8,236
Total		8,566
Ratio of past due loans to total loans, net of charge-offs and LIPs		7.42%
Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		147,764
Current		147,129
30 Days		0
60 Days		0
90 Days		635
Total		635
Ratio of past due loans to total loans, net of charge-offs and LIPs		0.43%
Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		193,613
Current		159,357
30 Days		679
60 Days		0
90 Days		33,577
Total		34,256
Ratio of past due loans to total loans, net of charge-offs and LIPs		17.69%
Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		163,146
Current		151,849
30 Days		1,163
60 Days		1,291
90 Days		8,843
Total		11,297
Ratio of past due loans to total loans, net of charge-offs and LIPs		6.92%
Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		699,340
Current		690,765
30 Days		0
60 Days		1,202
90 Days		7,373
Total		8,575
Ratio of past due loans to total loans, net of charge-offs and LIPs		1.23%
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		300,307
Current		292,015
30 Days		1,016
60 Days		0
90 Days		7,276
Total		8,292
Ratio of past due loans to total loans, net of charge-offs and LIPs		2.76%
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		108,995
Current		106,708
30 Days		55
60 Days		553
90 Days		1,679
Total		2,287
Ratio of past due loans to total loans, net of charge-offs and LIPs		2.10%
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		115,092
Current		114,059
30 Days		452
60 Days		100
90 Days		481
Total		1,033
Ratio of past due loans to total loans, net of charge-offs and LIPs		0.90%
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP		67,509
Current		65,434
30 Days		1,191
60 Days		446
90 Days		437
Total		2,074
Ratio of past due loans to total loans, net of charge-offs and LIPs		3.07%
Non-Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	7,705,224
Current	7,497,712
30 Days	38,516
60 Days	25,246
90 Days	143,750
Total	207,512
Ratio of past due loans to total loans, net of charge-offs and LIPs	2.69%
Non-Acquired Loans [Member] \| Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	5,902,633
Current	5,736,969
30 Days	33,571
60 Days	19,127
90 Days	112,966
Total	165,664
Ratio of past due loans to total loans, net of charge-offs and LIPs	2.81%
Non-Acquired Loans [Member] \| Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	94,930
Current	87,134
30 Days	899
60 Days	509
90 Days	6,388
Total	7,796
Ratio of past due loans to total loans, net of charge-offs and LIPs	8.21%
Non-Acquired Loans [Member] \| Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	123,965
Current	123,382
30 Days	1
60 Days	43
90 Days	539
Total	583
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.47%
Non-Acquired Loans [Member] \| Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	127,953
Current	114,563
30 Days	234
60 Days	3,226
90 Days	9,930
Total	13,390
Ratio of past due loans to total loans, net of charge-offs and LIPs	10.46%
Non-Acquired Loans [Member] \| Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	145,037
Current	136,545
30 Days	1,753
60 Days	895
90 Days	5,844
Total	8,492
Ratio of past due loans to total loans, net of charge-offs and LIPs	5.86%
Non-Acquired Loans [Member] \| Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	675,334
Current	670,859
30 Days	569
60 Days	594
90 Days	3,312
Total	4,475
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.66%
Non-Acquired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	305,046
Current	300,668
30 Days	334
60 Days	0
90 Days	4,044
Total	4,378
Ratio of past due loans to total loans, net of charge-offs and LIPs	1.44%
Non-Acquired Loans [Member] \| Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	148,565
Current	148,546
30 Days	9
60 Days	10
90 Days	0
Total	19
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.01%
Non-Acquired Loans [Member] \| Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	113,559
Current	112,824
30 Days	29
60 Days	318
90 Days	388
Total	735
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.65%
Non-Acquired Loans [Member] \| Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	68,202
Current	66,222
30 Days	1,117
60 Days	524
90 Days	339
Total	1,980
Ratio of past due loans to total loans, net of charge-offs and LIPs	2.90%
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	118,744
Current	105,733
30 Days	3,327
60 Days	2,811
90 Days	6,873
Total	13,011
Ratio of past due loans to total loans, net of charge-offs and LIPs	10.96%
Acquired Loans [Member] \| Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	343
Current	0
30 Days	0
60 Days	343
90 Days	0
Total	343
Ratio of past due loans to total loans, net of charge-offs and LIPs	100.00%
Acquired Loans [Member] \| Construction, Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	1,889
Current	1,889
30 Days	0
60 Days	0
90 Days	0
Total	0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.00%
Acquired Loans [Member] \| Construction, Custom [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	0
Current	0
30 Days	0
60 Days	0
90 Days	0
Total	0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.00%
Acquired Loans [Member] \| Land, Acquisition and Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	4,210
Current	3,685
30 Days	0
60 Days	0
90 Days	525
Total	525
Ratio of past due loans to total loans, net of charge-offs and LIPs	12.47%
Acquired Loans [Member] \| Land, Consumer Lot Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	0
Current	0
30 Days	0
60 Days	0
90 Days	0
Total	0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.00%
Acquired Loans [Member] \| Multi Family Housing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	1,074
Current	1,074
30 Days	0
60 Days	0
90 Days	0
Total	0
Ratio of past due loans to total loans, net of charge-offs and LIPs	0.00%
Acquired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	90,977
Current	80,860
30 Days	2,072
60 Days	1,698
90 Days	6,347
Total	10,117
Ratio of past due loans to total loans, net of charge-offs and LIPs	11.12%
Acquired Loans [Member] \| Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	5,099
Current	4,244
30 Days	125
60 Days	730
90 Days	0
Total	855
Ratio of past due loans to total loans, net of charge-offs and LIPs	16.77%
Acquired Loans [Member] \| Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	15,037
Current	13,912
30 Days	1,125
60 Days	0
90 Days	0
Total	1,125
Ratio of past due loans to total loans, net of charge-offs and LIPs	7.48%
Acquired Loans [Member] \| Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of Loan, Net of Charge-Offs and LIP	115
Current	69
30 Days	5
60 Days	40
90 Days	1
Total	46
Ratio of past due loans to total loans, net of charge-offs and LIPs	40.00%