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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 127,576 | $ 127,155 | $ 123,073 | $ 121,922 | $ 118,456 | $ 113,494
Loans receivable, gross | 12,540,254 |  | 12,201,387 |  |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 126,922 |  | 122,947 |  |  |
Loans receivable, gross | $ 11,265,547 |  | $ 11,000,212 |  |  |
Ratio | 1.10% |  | 1.10% |  |  |
Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 654 |  | $ 126 |  |  |
Loans receivable, gross | $ 115,429 |  | $ 28,553 |  |  |
Ratio | 0.60% |  | 0.40% |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 34,144 | 35,928 | $ 36,892 | 37,164 | 38,206 | 37,796
Loans receivable, gross | 5,705,350 |  | 5,711,004 |  |  |
Single-family residential | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 34,144 |  | 36,892 |  |  |
Loans receivable, gross | $ 5,684,940 |  | $ 5,713,576 |  |  |
Ratio | 0.60% |  | 0.70% |  |  |
Single-family residential | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 27,608 |  | $ 5,552 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 27,389 | 25,214 | $ 24,556 | 25,061 | 21,934 | 19,838
Loans receivable, gross | 1,732,202 |  | 1,597,996 |  |  |
Construction | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 27,389 |  | 24,556 |  |  |
Loans receivable, gross | $ 911,650 |  | $ 793,958 |  |  |
Ratio | 3.00% |  | 3.10% |  |  |
Construction | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 0 |  |  |
Loans receivable, gross | $ 5,012 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Construction - custom |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 2,081 | 2,052 | $ 1,944 | 1,176 | 1,110 | 1,080
Loans receivable, gross | 597,671 |  | 602,631 |  |  |
Construction - custom | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,081 |  | 1,944 |  |  |
Loans receivable, gross | $ 295,699 |  | $ 277,495 |  |  |
Ratio | 0.70% |  | 0.70% |  |  |
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 |  | $ 105 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 7,622 | 7,355 | $ 6,829 | 6,669 | 6,665 | 6,023
Loans receivable, gross | 141,628 |  | 124,308 |  |  |
Land - acquisition & development | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 7,622 |  | 6,828 |  |  |
Loans receivable, gross | $ 116,877 |  | $ 104,767 |  |  |
Ratio | 6.50% |  | 6.50% |  |  |
Land - acquisition & development | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 0 |  | $ 1 |  |  |
Loans receivable, gross | $ 2,186 |  | $ 89 |  |  |
Ratio | 0.00% |  | 1.00% |  |  |
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 2,853 | 2,906 | $ 2,649 | 2,513 | 2,501 | 2,535
Loans receivable, gross | 102,779 |  | 104,405 |  |  |
Land - consumer lot loans | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,853 |  | 2,649 |  |  |
Loans receivable, gross | $ 95,482 |  | $ 96,337 |  |  |
Ratio | 3.00% |  | 2.80% |  |  |
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 | $ 495 |  | $ 171 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 7,982 | 7,904 | $ 7,862 | 7,929 | 7,629 | 6,925
Loans receivable, gross | 1,328,049 |  | 1,303,148 |  |  |
Multi-family | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 7,978 |  | 7,857 |  |  |
Loans receivable, gross | $ 1,324,959 |  | $ 1,302,625 |  |  |
Ratio | 0.60% |  | 0.60% |  |  |
Multi-family | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 4 |  | $ 5 |  |  |
Loans receivable, gross | $ 3,068 |  | $ 493 |  |  |
Ratio | 0.10% |  | 1.00% |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 11,588 | 11,625 | $ 11,818 | 10,772 | 10,168 | 8,588
Loans receivable, gross | 1,443,437 |  | 1,434,610 |  |  |
Commercial real estate | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 11,484 |  | 11,698 |  |  |
Loans receivable, gross | $ 1,385,851 |  | $ 1,391,668 |  |  |
Ratio | 0.80% |  | 0.80% |  |  |
Commercial real estate | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 104 |  | $ 120 |  |  |
Loans receivable, gross | $ 39,861 |  | $ 21,765 |  |  |
Ratio | 0.30% |  | 0.60% |  |  |
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 29,330 | 29,268 | $ 28,524 | 28,365 | 27,736 | 28,008
Loans receivable, gross | 1,151,108 |  | 1,093,360 |  |  |
Commercial & industrial | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 28,784 |  | 28,524 |  |  |
Loans receivable, gross | $ 1,114,171 |  | $ 1,093,210 |  |  |
Ratio | 2.60% |  | 2.60% |  |  |
Commercial & industrial | Loans Individually Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 546 |  | $ 0 |  |  |
Loans receivable, gross | $ 36,888 |  | $ 81 |  |  |
Ratio | 1.50% |  | 0.00% |  |  |
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 802 | 808 | $ 855 | 826 | 832 | 813
Loans receivable, gross | 135,119 |  | 144,850 |  |  |
HELOC | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 802 |  | 855 |  |  |
Loans receivable, gross | $ 133,152 |  | $ 141,689 |  |  |
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 | $ 273 |  | $ 215 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 3,785 | $ 4,095 | $ 1,144 | $ 1,447 | $ 1,675 | $ 1,888
Loans receivable, gross | 202,911 |  | 85,075 |  |  |
Consumer | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 3,785 |  | 1,144 |  |  |
Loans receivable, gross | $ 202,766 |  | $ 84,887 |  |  |
Ratio | 1.90% |  | 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 | $ 38 |  | $ 82 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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