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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 10,572,201 |  | $ 9,823,270 |  |  |
Ratio of type of loan to total loans receivable | 100.00% |  | 100.00% |  |  |
Allowance for loan losses | $ 111,016 | $ 109,919 | $ 106,829 | $ 105,611 | $ 108,323 | $ 114,591
Loans in process | 780,721 |  | 476,796 |  |  |
Discount on acquired loans | 14,775 |  | 30,095 |  |  |
Deferred net origination fees | 37,113 |  | 38,916 |  |  |
Total loan contra accounts | 943,625 |  | 652,636 |  |  |
Net Loans | 9,628,576 |  | 9,170,634 |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 40,681 | 41,828 | 47,347 | 52,004 | 54,762 | 62,763
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 17,662 | 15,726 | 6,680 | 5,933 | 5,445 | 6,742
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,028 | 1,022 | 990 | 985 | 968 | 1,695
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 6,722 | 7,252 | 5,781 | 5,772 | 7,405 | 5,592
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,504 | 2,466 | 2,946 | 2,999 | 3,035 | 3,077
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 6,921 | 6,784 | 5,304 | 5,035 | 4,673 | 4,248
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 8,143 | 7,783 | 8,960 | 7,268 | 6,734 | 7,548
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 24,396 | 23,824 | 24,980 | 21,662 | 21,146 | 16,527
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 856 | 828 | 902 | 864 | 850 | 928
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,103 | $ 2,406 | 2,939 | $ 3,089 | $ 3,305 | $ 3,227
Non-Acquired loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 10,303,150 |  | $ 9,493,987 |  |  |
Ratio of type of loan to total loans receivable | 97.50% |  | 96.80% |  |  |
Non-Acquired loans | Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 5,593,018 |  | $ 5,651,845 |  |  |
Ratio of type of loan to total loans receivable | 52.90% |  | 57.60% |  |  |
Non-Acquired loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,016,305 |  | $ 200,509 |  |  |
Ratio of type of loan to total loans receivable | 9.60% |  | 2.00% |  |  |
Non-Acquired loans | Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 409,116 |  | $ 396,307 |  |  |
Ratio of type of loan to total loans receivable | 3.90% |  | 4.00% |  |  |
Non-Acquired loans | Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 101,849 |  | $ 94,208 |  |  |
Ratio of type of loan to total loans receivable | 1.00% |  | 1.00% |  |  |
Non-Acquired loans | Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 101,731 |  | $ 103,989 |  |  |
Ratio of type of loan to total loans receivable | 1.00% |  | 1.10% |  |  |
Non-Acquired loans | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 1,094,736 |  | $ 1,125,722 |  |  |
Ratio of type of loan to total loans receivable | 10.30% |  | 11.60% |  |  |
Non-Acquired loans | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 886,957 |  | $ 986,270 |  |  |
Ratio of type of loan to total loans receivable | 8.40% |  | 10.00% |  |  |
Non-Acquired loans | Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 810,442 |  | $ 612,836 |  |  |
Ratio of type of loan to total loans receivable | 7.70% |  | 6.20% |  |  |
Non-Acquired loans | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 134,735 |  | $ 127,646 |  |  |
Ratio of type of loan to total loans receivable | 1.30% |  | 1.30% |  |  |
Non-Acquired loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 154,261 |  | $ 194,655 |  |  |
Ratio of type of loan to total loans receivable | 1.40% |  | 2.00% |  |  |
Acquired loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 140,369 |  | $ 166,293 |  |  |
Ratio of type of loan to total loans receivable | 1.30% |  | 1.60% |  |  |
Credit impaired acquired loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 96,491 |  | $ 87,081 |  |  |
Ratio of type of loan to total loans receivable | 0.90% |  | 0.90% |  |  |
Covered loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 32,191 |  | $ 75,909 |  |  |
Ratio of type of loan to total loans receivable | 0.30% |  | 0.70% |  |  |

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