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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | 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 | $ 9,791,480 |  | $ 9,346,474
Current | 9,719,843 |  | 9,263,876
Past due | $ 71,637 |  | $ 82,598
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.73% | 0.90% | 0.88%
Ratio of total past due loans to total loans receivable, current | 99.27% |  | 99.12%
Ratio of total past due loans to total loans receivable, past due | 0.73% |  | 0.88%
Financing Receivables, 1 to 29 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | $ 17,653 |  | $ 21,212
Ratio of total past due loans to total loans receivable, past due | 0.18% |  | 0.23%
Financing Receivables, 30 to 59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | $ 9,332 |  | $ 9,198
Ratio of total past due loans to total loans receivable, past due | 0.10% |  | 0.10%
Financing Receivables, 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | $ 44,652 |  | $ 52,188
Ratio of total past due loans to total loans receivable, past due | 0.46% |  | 0.56%
Non-Acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 9,522,429 |  | $ 9,073,176
Current | 9,460,103 |  | 8,997,648
Past due | $ 62,326 |  | $ 75,528
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.65% |  | 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 | $ 5,596,644 |  | $ 5,655,928
Current | 5,542,000 |  | 5,590,673
Past due | $ 54,644 |  | $ 65,255
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.98% |  | 1.15%
Non-Acquired loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 442,810 |  | $ 130,121
Current | 442,810 |  | 130,121
Past due | $ 0 |  | $ 0
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.00% |  | 0.00%
Non-Acquired loans | Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 213,465 |  | $ 205,692
Current | 212,690 |  | 204,168
Past due | $ 775 |  | $ 1,524
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.36% |  | 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 | $ 86,243 |  | $ 75,661
Current | 85,775 |  | 74,737
Past due | $ 468 |  | $ 924
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.54% |  | 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 | $ 102,248 |  | $ 104,494
Current | 100,304 |  | 102,045
Past due | $ 1,944 |  | $ 2,449
Ratio of past due loans to total loans, net of charge-offs and LIPs | 1.90% |  | 2.34%
Non-Acquired loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 1,095,174 |  | $ 1,068,038
Current | 1,094,284 |  | 1,065,667
Past due | $ 956 |  | $ 2,371
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.09% |  | 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 | $ 886,552 |  | $ 893,072
Current | 884,644 |  | 892,180
Past due | $ 1,783 |  | $ 892
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.20% |  | 0.10%
Non-Acquired loans | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 811,502 |  | $ 617,545
Current | 811,486 |  | 616,602
Past due | $ 75 |  | $ 943
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.01% |  | 0.15%
Non-Acquired loans | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 134,151 |  | $ 127,648
Current | 133,236 |  | 127,196
Past due | $ 915 |  | $ 452
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.68% |  | 0.35%
Non-Acquired loans | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | $ 153,640 |  | $ 194,977
Current | 152,874 |  | 194,259
Past due | $ 766 |  | $ 718
Ratio of past due loans to total loans, net of charge-offs and LIPs | 0.50% |  | 0.37%
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | $ 16,971 |  | $ 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 | 14,268 |  | 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 | 110 |  | 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 | 0 |  | 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 | 738 |  | 689
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 956 |  | 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 | 217 |  | 131
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 0 |  | 93
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 297 |  | 174
Non-Acquired loans | Financing Receivables, 1 to 29 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 385 |  | 493
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 8,801 |  | 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 | 6,679 |  | 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 | 159 |  | 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 | 101 |  | 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 | 1,443 |  | 0
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 75 |  | 27
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 70 |  | 27
Non-Acquired loans | Financing Receivables, 30 to 59 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 274 |  | 170
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 36,554 |  | 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 | 33,697 |  | 40,193
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 0 |  | 0
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Construction - custom |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 506 |  | 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 | 468 |  | 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 | 1,105 |  | 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 | 0 |  | 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 | 123 |  | 761
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Commercial & industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 0 |  | 823
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 548 |  | 251
Non-Acquired loans | Financing Receivables, 60 to 89 Days Past Due | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 107 |  | 55
Acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | 140,369 |  | 57,682
Current | 137,107 |  | 56,559
Past due | $ 3,262 |  | $ 1,123
Ratio of past due loans to total loans, net of charge-offs and LIPs | 2.32% |  | 1.95%
Acquired loans | Financing Receivables, 1 to 29 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | $ 265 |  | $ 356
Acquired loans | Financing Receivables, 30 to 59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 529 |  | 0
Acquired loans | Financing Receivables, 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 2,468 |  | 767
Credit impaired acquired loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | 96,491 |  | 139,726
Current | 91,168 |  | 138,940
Past due | $ 5,323 |  | $ 786
Ratio of past due loans to total loans, net of charge-offs and LIPs | 5.52% |  | 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 | 0 |  | 4
Credit impaired acquired loans | Financing Receivables, 60 to 89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | 5,323 |  | 539
Covered loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Amount of loans, net of charge-offs and LIP | 32,191 |  | 75,890
Current | 31,465 |  | 70,729
Past due | $ 726 |  | $ 5,161
Ratio of past due loans to total loans, net of charge-offs and LIPs | 2.26% |  | 6.80%
Covered loans | Financing Receivables, 1 to 29 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past due | $ 417 |  | $ 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 | $ 307 |  | $ 4,799

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