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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, 2013
Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP $ 7,578,740 $ 7,653,050
Current 7,406,745 7,447,005
30 Days 35,858 41,202
60 Days 19,369 24,199
90 Days 116,768 140,644
Total 171,995 206,045
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.27% 2.69%
Non-Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 7,174,707 7,541,953
Current 7,025,240 7,345,497
30 Days 32,017 39,584
60 Days 16,186 21,560
90 Days 101,264 135,312
Total 149,467 196,456
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.08% 2.60%
Non-Acquired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 5,250,621 5,776,002
Current 5,127,074 5,618,261
30 Days 26,315 34,035
60 Days 14,354 16,276
90 Days 82,878 107,430
Total 123,547 157,741
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.35% 2.73%
Non-Acquired Loans [Member] | Construction - Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 78,505 88,849
Current 75,506 85,785
30 Days 1,042 142
60 Days 0 190
90 Days 1,957 2,732
Total 2,999 3,064
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.82% 3.45%
Non-Acquired Loans [Member] | Construction - Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 127,978 107,882
Current 127,738 107,215
30 Days 240 128
60 Days 0 0
90 Days 0 539
Total 240 667
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.19% 0.62%
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 80,994 119,192
Current 73,252 106,321
30 Days 797 853
60 Days 0 1,004
90 Days 6,945 11,014
Total 7,742 12,871
Ratio of past due loans to total loans, net of charge-offs and LIPs 9.56% 10.80%
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 128,571 141,772
Current 124,284 134,560
30 Days 588 1,688
60 Days 195 375
90 Days 3,504 5,149
Total 4,287 7,212
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.33% 5.09%
Non-Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 716,299 676,917
Current 714,161 672,263
30 Days 0 718
60 Days 539 67
90 Days 1,599 3,869
Total 2,138 4,654
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.30% 0.69%
Non-Acquired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 389,348 292,261
Current 384,193 284,427
30 Days 1,277 699
60 Days 70 3,153
90 Days 3,808 3,982
Total 5,155 7,834
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.32% 2.68%
Non-Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 239,456 162,802
Current 239,440 162,778
30 Days 0 8
60 Days 0 0
90 Days 16 16
Total 16 24
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.01% 0.01%
Non-Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 111,419 112,902
Current 110,324 112,482
30 Days 820 158
60 Days 69 64
90 Days 206 198
Total 1,095 420
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.98% 0.37%
Non-Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 51,516 63,374
Current 49,268 61,405
30 Days 938 1,155
60 Days 959 431
90 Days 351 383
Total 2,248 1,969
Ratio of past due loans to total loans, net of charge-offs and LIPs 4.36% 3.11%
Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 302,006  
Current 287,462  
30 Days 2,972  
60 Days 2,991  
90 Days 8,581  
Total 14,544  
Ratio of past due loans to total loans, net of charge-offs and LIPs 4.82%  
Acquired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 15,354  
Current 15,291  
30 Days 5  
60 Days 15  
90 Days 43  
Total 63  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.41%  
Acquired Loans [Member] | Construction - Speculative [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] | 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 & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 3,720  
Current 2,783  
30 Days 412  
60 Days 1  
90 Days 524  
Total 937  
Ratio of past due loans to total loans, net of charge-offs and LIPs 25.19%  
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 3,614  
Current 3,095  
30 Days 311  
60 Days 0  
90 Days 208  
Total 519  
Ratio of past due loans to total loans, net of charge-offs and LIPs 14.36%  
Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 7,383  
Current 3,569  
30 Days 509  
60 Days 0  
90 Days 3,305  
Total 3,814  
Ratio of past due loans to total loans, net of charge-offs and LIPs 51.66%  
Acquired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 162,689  
Current 155,178  
30 Days 1,059  
60 Days 2,560  
90 Days 3,892  
Total 7,511  
Ratio of past due loans to total loans, net of charge-offs and LIPs 4.62%  
Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 88,746  
Current 88,028  
30 Days 453  
60 Days 265  
90 Days 0  
Total 718  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.81%  
Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 11,465  
Current 10,619  
30 Days 140  
60 Days 131  
90 Days 575  
Total 846  
Ratio of past due loans to total loans, net of charge-offs and LIPs 7.38%  
Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 9,035  
Current 8,899  
30 Days 83  
60 Days 19  
90 Days 34  
Total 136  
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.51%  
Credit Impaired Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 102,027 111,097
Current 94,043 101,508
30 Days 869 1,618
60 Days 192 2,639
90 Days 6,923 5,332
Total 7,984 9,589
Ratio of past due loans to total loans, net of charge-offs and LIPs 7.83% 8.63%
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 335 342
Current 335 342
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Construction - Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 0 1,889
Current 0 1,889
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Construction - Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 0 0
Current 0 0
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 2,483 3,702
Current 2,483 3,219
30 Days 0 365
60 Days 0 0
90 Days 0 118
Total 0 483
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 13.05%
Credit Impaired 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 0
Current 0 0
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 0 601
Current 0 0
30 Days 0 601
60 Days 0 0
90 Days 0 0
Total 0 601
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 78,509 87,134
Current 75,920 78,959
30 Days 639 412
60 Days 173 2,549
90 Days 1,777 5,214
Total 2,589 8,175
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.30% 9.38%
Credit Impaired Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 8,606 3,292
Current 3,320 3,054
30 Days 230 238
60 Days 0 0
90 Days 5,056 0
Total 5,286 238
Ratio of past due loans to total loans, net of charge-offs and LIPs 61.42% 7.23%
Credit Impaired Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 12,015 14,040
Current 11,906 13,950
30 Days 0 0
60 Days 19 90
90 Days 90 0
Total 109 90
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.91% 0.64%
Credit Impaired Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 79 97
Current 79 95
30 Days 0 2
60 Days 0 0
90 Days 0 0
Total $ 0 $ 2
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 2.06%