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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 118,456 | $ 113,494 | $ 107,901 | $ 106,829
Loans receivable, gross | 11,328,633 | 10,950,608 |  |
Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 118,089 | 113,128 |  |
Loans receivable, gross | $ 10,171,700 | $ 9,784,140 |  |
Ratio | 1.20% | 1.20% |  |
Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 367 | $ 366 |  |
Loans receivable, gross | $ 51,726 | $ 34,271 |  |
Ratio | 0.70% | 1.10% |  |
Single-family residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 38,206 | $ 37,796 | 47,756 | 47,347
Loans receivable, gross | 5,624,263 | 5,658,830 |  |
Single-family residential | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 38,092 | 37,536 |  |
Loans receivable, gross | $ 5,585,461 | $ 5,585,912 |  |
Ratio | 0.70% | 0.70% |  |
Single-family residential | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 114 | $ 260 |  |
Loans receivable, gross | $ 30,165 | $ 19,629 |  |
Ratio | 0.40% | 1.30% |  |
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 21,934 | $ 19,838 | 7,014 | 6,680
Loans receivable, gross | 1,265,747 | 1,110,411 |  |
Construction | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 21,934 | 19,838 |  |
Loans receivable, gross | $ 513,046 | $ 498,450 |  |
Ratio | 4.30% | 4.00% |  |
Construction | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loans receivable, gross | $ 0 | $ 0 |  |
Ratio | 0.00% | 0.00% |  |
Construction - custom |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 1,110 | $ 1,080 | 1,062 | 990
Loans receivable, gross | 494,447 | 473,069 |  |
Construction - custom | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,110 | 1,080 |  |
Loans receivable, gross | $ 236,668 | $ 229,298 |  |
Ratio | 0.50% | 0.50% |  |
Construction - custom | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loans receivable, gross | $ 0 | $ 330 |  |
Ratio | 0.00% | 0.00% |  |
Land - acquisition & development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 6,665 | $ 6,023 | 6,778 | 5,781
Loans receivable, gross | 119,085 | 118,497 |  |
Land - acquisition & development | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 6,621 | 6,022 |  |
Loans receivable, gross | $ 101,598 | $ 90,850 |  |
Ratio | 6.50% | 6.60% |  |
Land - acquisition & development | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 44 | $ 2 |  |
Loans receivable, gross | $ 886 | $ 850 |  |
Ratio | 5.00% | 0.20% |  |
Land - consumer lot loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 2,501 | $ 2,535 | 3,001 | 2,946
Loans receivable, gross | 101,104 | 104,567 |  |
Land - consumer lot loans | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 2,501 | 2,535 |  |
Loans receivable, gross | $ 90,947 | $ 92,828 |  |
Ratio | 2.70% | 2.70% |  |
Land - consumer lot loans | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loans receivable, gross | $ 1,384 | $ 558 |  |
Ratio | 0.00% | 0.00% |  |
Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 7,629 | $ 6,925 | 5,047 | 5,304
Loans receivable, gross | 1,217,594 | 1,124,290 |  |
Multi-family | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 7,617 | 6,911 |  |
Loans receivable, gross | $ 1,215,870 | $ 1,091,974 |  |
Ratio | 0.60% | 0.60% |  |
Multi-family | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 12 | $ 13 |  |
Loans receivable, gross | $ 1,496 | $ 1,505 |  |
Ratio | 0.80% | 0.90% |  |
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 10,168 | $ 8,588 | 10,344 | 8,960
Loans receivable, gross | 1,207,573 | 1,093,639 |  |
Commercial real estate | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 9,971 | 8,497 |  |
Loans receivable, gross | $ 1,144,389 | $ 957,380 |  |
Ratio | 0.90% | 0.90% |  |
Commercial real estate | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 197 | $ 91 |  |
Loans receivable, gross | $ 15,473 | $ 11,157 |  |
Ratio | 1.30% | 0.80% |  |
Commercial & industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 27,736 | $ 28,008 | 24,096 | 24,980
Loans receivable, gross | 1,025,821 | 978,589 |  |
Commercial & industrial | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 27,736 | 28,008 |  |
Loans receivable, gross | $ 1,021,372 | $ 966,930 |  |
Ratio | 2.70% | 2.90% |  |
Commercial & industrial | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loans receivable, gross | $ 1,517 | $ 0 |  |
Ratio | 0.00% | 0.00% |  |
HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 832 | $ 813 | 820 | 902
Loans receivable, gross | 148,452 | 149,716 |  |
HELOC | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 832 | 813 |  |
Loans receivable, gross | $ 138,094 | $ 133,203 |  |
Ratio | 0.60% | 0.60% |  |
HELOC | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loans receivable, gross | $ 805 | $ 239 |  |
Ratio | 0.00% | 0.00% |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 1,675 | $ 1,888 | $ 1,983 | $ 2,939
Loans receivable, gross | 124,547 | 139,000 |  |
Consumer | Loans Collectively Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | 1,675 | 1,888 |  |
Loans receivable, gross | $ 124,255 | $ 137,315 |  |
Ratio | 1.30% | 1.40% |  |
Consumer | Loans Individually Evaluated for Impairment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ 0 | $ 0 |  |
Loans receivable, gross | $ 0 | $ 3 |  |
Ratio | 0.00% | 0.00% |  |

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