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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 121,922 | $ 118,456 | $ 113,494 | $ 109,919 | $ 107,901 | $ 106,829
Loans receivable, gross | 11,640,489 |  | 10,950,608 |  |  |
Acquired and Covered Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 70,000 |  |  |  |  |
Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 121,822 |  | 113,128 |  |  |
Loans receivable, gross | $ 10,494,900 |  | $ 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 | $ 100 |  | $ 366 |  |  |
Loans receivable, gross | $ 65,658 |  | $ 34,271 |  |  |
Ratio | 0.20% |  | 1.10% |  |  |
Single-family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 37,164 | 38,206 | $ 37,796 | 41,828 | 47,756 | 47,347
Loans receivable, gross | 5,693,072 |  | 5,658,830 |  |  |
Single-family residential | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 37,164 |  | 37,536 |  |  |
Loans receivable, gross | $ 5,661,673 |  | $ 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 | $ 0 |  | $ 260 |  |  |
Loans receivable, gross | $ 25,370 |  | $ 19,629 |  |  |
Ratio | 0.00% |  | 1.30% |  |  |
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 25,061 | 21,934 | $ 19,838 | 15,726 | 7,014 | 6,680
Loans receivable, gross | 1,311,635 |  | 1,110,411 |  |  |
Construction | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 25,061 |  | 19,838 |  |  |
Loans receivable, gross | $ 593,479 |  | $ 498,450 |  |  |
Ratio | 4.20% |  | 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 | $ 1,176 | 1,110 | $ 1,080 | 1,022 | 1,062 | 990
Loans receivable, gross | 527,319 |  | 473,069 |  |  |
Construction - custom | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,176 |  | 1,080 |  |  |
Loans receivable, gross | $ 251,801 |  | $ 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 | $ 105 |  | $ 330 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Land - acquisition & development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 6,669 | 6,665 | $ 6,023 | 7,252 | 6,778 | 5,781
Loans receivable, gross | 118,726 |  | 118,497 |  |  |
Land - acquisition & development | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 6,666 |  | 6,022 |  |  |
Loans receivable, gross | $ 102,281 |  | $ 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 | $ 2 |  | $ 2 |  |  |
Loans receivable, gross | $ 438 |  | $ 850 |  |  |
Ratio | 0.10% |  | 0.20% |  |  |
Land - consumer lot loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 2,513 | 2,501 | $ 2,535 | 2,466 | 3,001 | 2,946
Loans receivable, gross | 101,227 |  | 104,567 |  |  |
Land - consumer lot loans | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 2,513 |  | 2,535 |  |  |
Loans receivable, gross | $ 91,402 |  | $ 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 | $ 794 |  | $ 558 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 7,929 | 7,629 | $ 6,925 | 6,784 | 5,047 | 5,304
Loans receivable, gross | 1,266,911 |  | 1,124,290 |  |  |
Multi-family | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 7,919 |  | 6,911 |  |  |
Loans receivable, gross | $ 1,264,130 |  | $ 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 | $ 10 |  | $ 13 |  |  |
Loans receivable, gross | $ 2,496 |  | $ 1,505 |  |  |
Ratio | 0.30% |  | 0.90% |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 10,772 | 10,168 | $ 8,588 | 7,783 | 10,344 | 8,960
Loans receivable, gross | 1,296,039 |  | 1,093,639 |  |  |
Commercial real estate | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 10,685 |  | 8,497 |  |  |
Loans receivable, gross | $ 1,226,228 |  | $ 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 | $ 88 |  | $ 91 |  |  |
Loans receivable, gross | $ 26,112 |  | $ 11,157 |  |  |
Ratio | 0.30% |  | 0.80% |  |  |
Commercial & industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 28,365 | 27,736 | $ 28,008 | 23,824 | 24,096 | 24,980
Loans receivable, gross | 1,071,629 |  | 978,589 |  |  |
Commercial & industrial | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 28,365 |  | 28,008 |  |  |
Loans receivable, gross | $ 1,059,310 |  | $ 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 | $ 9,606 |  | $ 0 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 826 | 832 | $ 813 | 828 | 820 | 902
Loans receivable, gross | 146,172 |  | 149,716 |  |  |
HELOC | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 826 |  | 813 |  |  |
Loans receivable, gross | $ 137,124 |  | $ 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 | $ 722 |  | $ 239 |  |  |
Ratio | 0.00% |  | 0.00% |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | $ 1,447 | $ 1,675 | $ 1,888 | $ 2,406 | $ 1,983 | $ 2,939
Loans receivable, gross | 107,759 |  | 139,000 |  |  |
Consumer | Loans Collectively Evaluated for Impairment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 1,447 |  | 1,888 |  |  |
Loans receivable, gross | $ 107,472 |  | $ 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 | $ 15 |  | $ 3 |  |  |
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=65884687&loc=d3e4428-111522 + Details
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