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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
Mar. 31, 2014
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP $ 7,916,228 $ 7,714,968
Current 7,791,961 7,563,335
30 Days 33,840 35,179
60 Days 12,925 14,933
90 Days 77,502 101,521
Total 124,267 151,633
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.57% 1.97%
Non-Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 7,612,058 7,365,734
Current 7,494,058 7,224,617
30 Days 32,973 32,437
60 Days 12,445 13,575
90 Days 72,582 95,105
Total 118,000 141,117
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.55% 1.92%
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 5,445,950 5,356,200
Current 5,343,076 5,237,413
30 Days 27,559 26,888
60 Days 11,275 12,373
90 Days 64,040 79,526
Total 102,874 118,787
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.89% 2.22%
Non-Acquired Loans [Member] | Construction - Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 88,954 82,422
Current 88,124 80,047
30 Days 196 0
60 Days 0 0
90 Days 634 2,375
Total 830 2,375
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.93% 2.88%
Non-Acquired Loans [Member] | Construction - Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 178,099 130,095
Current 176,624 129,678
30 Days 1,210 417
60 Days 0 0
90 Days 265 0
Total 1,475 417
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.83% 0.32%
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 67,314 71,567
Current 65,259 70,106
30 Days 0 0
60 Days 0 0
90 Days 2,055 1,461
Total 2,055 1,461
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.05% 2.04%
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 113,567 121,473
Current 110,021 117,076
30 Days 391 806
60 Days 273 355
90 Days 2,882 3,236
Total 3,546 4,397
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.12% 3.62%
Non-Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 848,708 790,564
Current 847,562 785,793
30 Days 20 0
60 Days 0 0
90 Days 1,126 4,771
Total 1,146 4,771
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.14% 0.60%
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 438,382 404,680
Current 435,766 398,114
30 Days 967 2,942
60 Days 387 351
90 Days 1,262 3,273
Total 2,616 6,566
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.60% 1.62%
Non-Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 277,100 249,405
Current 275,817 249,363
30 Days 1,246 42
60 Days 1 0
90 Days 36 0
Total 1,283 42
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.46% 0.02%
Non-Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 112,550 112,186
Current 111,625 111,407
30 Days 603 493
60 Days 284 213
90 Days 38 73
Total 925 779
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.82% 0.69%
Non-Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 41,434 47,142
Current 40,184 45,620
30 Days 781 849
60 Days 225 283
90 Days 244 390
Total 1,250 1,522
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.02% 3.23%
Acquired Non-Impaired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 218,507 250,350
Current 213,397 243,718
30 Days 519 441
60 Days 480 894
90 Days 4,111 5,297
Total 5,110 6,632
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.34% 2.65%
Acquired Non-Impaired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 13,177 14,468
Current 13,104 14,343
30 Days 73 82
60 Days 0 0
90 Days 0 43
Total 73 125
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.55% 0.86%
Acquired Non-Impaired Loans [Member] | Construction - Speculative [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%  
Acquired Non-Impaired 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%  
Acquired Non-Impaired Loans [Member] | Land - Acquisition & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 1,135 1,489
Current 726 1,241
30 Days 0 0
60 Days 409 0
90 Days 0 248
Total 409 248
Ratio of past due loans to total loans, net of charge-offs and LIPs 36.04% 16.66%
Acquired Non-Impaired Loans [Member] | Land - Consumer Lot Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 3,240 3,313
Current 3,115 2,987
30 Days 0 125
60 Days 0 100
90 Days 125 101
Total 125 326
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.86% 9.84%
Acquired Non-Impaired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 3,538 3,914
Current 3,402 3,914
30 Days 0 0
60 Days 0 0
90 Days 136 0
Total 136 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.84% 0.00%
Acquired Non-Impaired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 112,083 133,398
Current 108,651 128,610
30 Days 96 134
60 Days 0 617
90 Days 3,336 4,037
Total 3,432 4,788
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.06% 3.59%
Acquired Non-Impaired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 69,868 75,323
Current 69,542 74,992
30 Days 120 10
60 Days 69 153
90 Days 137 168
Total 326 331
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.47% 0.44%
Acquired Non-Impaired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 8,624 10,179
Current 8,440 10,063
30 Days 184 0
60 Days 0 16
90 Days 0 100
Total 184 116
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.13% 1.14%
Acquired Non-Impaired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 6,842 8,266
Current 6,417 7,568
30 Days 46 90
60 Days 2 8
90 Days 377 600
Total 425 698
Ratio of past due loans to total loans, net of charge-offs and LIPs 6.21% 8.44%
Credit Impaired Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 85,663 98,884
Current 84,506 95,000
30 Days 348 2,301
60 Days 0 464
90 Days 809 1,119
Total 1,157 3,884
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.35% 3.93%
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 329 333
Current 329 333
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 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%  
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 1,758 2,393
Current 1,758 1,929
30 Days 0 0
60 Days 0 464
90 Days 0 0
Total 0 464
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 19.39%
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 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] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 68,115 83,116
Current 67,767 80,095
30 Days 348 2,301
60 Days 0 0
90 Days 0 720
Total 348 3,021
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.51% 3.63%
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 4,724 1,705
Current 4,318 1,396
30 Days 0 0
60 Days 0 0
90 Days 406 309
Total 406 309
Ratio of past due loans to total loans, net of charge-offs and LIPs 8.59% 18.12%
Credit Impaired Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 10,679 11,266
Current 10,276 11,176
30 Days 0 0
60 Days 0 0
90 Days 403 90
Total 403 90
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.77% 0.80%
Credit Impaired Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 58 71
Current 58 71
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%