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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Sep. 30, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 9,715,006 | $ 9,346,474
Current | 9,627,653 | 9,263,876
Past due | $ 87,353 | $ 82,598
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.90% | 0.88%
Ratio of total past due loans to total loans receivable, current | 99.10% | 99.12%
Ratio of total past due loans to total loans receivable, past due | 0.90% | 0.88%
Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 26,202 | $ 21,212
Ratio of total past due loans to total loans receivable, past due | 0.27% | 0.23%
Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 10,446 | $ 9,198
Ratio of total past due loans to total loans receivable, past due | 0.11% | 0.10%
Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 50,705 | $ 52,188
Ratio of total past due loans to total loans receivable, past due | 0.52% | 0.56%
Non-Acquired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 9,498,792 | $ 9,073,176
Current | 9,413,444 | 8,997,648
Past due | $ 85,348 | $ 75,528
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.90% | 0.83%
Non-Acquired loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 5,624,134 | $ 5,655,928
Current | 5,558,731 | 5,590,673
Past due | $ 65,403 | $ 65,255
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.16% | 1.15%
Non-Acquired loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 396,322 | $ 130,121
Current | 396,181 | 130,121
Past due | $ 141 | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.04% | 0.00%
Non-Acquired loans | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 212,067 | $ 205,692
Current | 209,153 | 204,168
Past due | $ 2,914 | $ 1,524
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.37% | 0.74%
Non-Acquired loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 92,467 | $ 75,661
Current | 90,541 | 74,737
Past due | $ 1,926 | $ 924
Ratio of past due loans to total loans, net of charge-offs and LIPs | 2.08% | 1.22%
Non-Acquired loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 101,372 | $ 104,494
Current | 99,379 | 102,045
Past due | $ 1,993 | $ 2,449
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.97% | 2.34%
Non-Acquired loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 1,077,248 | $ 1,068,038
Current | 1,075,662 | 1,065,667
Past due | $ 1,586 | $ 2,371
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.15% | 0.22%
Non-Acquired loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 889,342 | $ 893,072
Current | 881,896 | 892,180
Past due | $ 7,446 | $ 892
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.84% | 0.10%
Non-Acquired loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 810,452 | $ 617,545
Current | 808,825 | 616,602
Past due | $ 1,627 | $ 943
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.20% | 0.15%
Non-Acquired loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 130,446 | $ 127,648
Current | 129,456 | 127,196
Past due | $ 990 | $ 452
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.76% | 0.35%
Non-Acquired loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | $ 164,942 | $ 194,977
Current | 163,620 | 194,259
Past due | $ 1,322 | $ 718
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.80% | 0.37%
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 25,788 | $ 20,341
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 18,000 | 17,305
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 1,047 | 791
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 1,445 | 406
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 563 | 689
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 970 | 259
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 1,766 | 131
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 862 | 93
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 378 | 174
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 757 | 493
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 10,398 | 9,104
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 7,785 | 7,757
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 1,800 | 270
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 490 | 399
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 454
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 53 | 0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 0 | 27
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 63 | 27
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 207 | 170
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 49,162 | 46,083
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 39,618 | 40,193
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 141 | 0
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 67 | 463
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 481 | 518
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 940 | 1,361
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 616 | 1,658
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 5,627 | 761
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 765 | 823
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 549 | 251
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 358 | 55
Acquired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 131,079 | 57,682
Current | 130,030 | 56,559
Past due | $ 1,049 | $ 1,123
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.80% | 1.95%
Acquired loans | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 376 | $ 356
Acquired loans | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 2 | 0
Acquired loans | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 671 | 767
Credit impaired acquired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 50,924 | 139,726
Current | 50,604 | 138,940
Past due | $ 320 | $ 786
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.63% | 0.56%
Credit impaired acquired loans | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 0 | $ 243
Credit impaired acquired loans | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 44 | 4
Credit impaired acquired loans | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 276 | 539
Covered loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans, net of charge-offs and LIP | 34,211 | 75,890
Current | 33,575 | 70,729
Past due | $ 636 | $ 5,161
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.86% | 6.80%
Covered loans | Financing Receivables, 1 to 29 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 38 | $ 272
Covered loans | Financing Receivables, 30 to 59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | 2 | 90
Covered loans | Financing Receivables, 60 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past due | $ 596 | $ 4,799

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