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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 128,666 $ 127,576 $ 123,073 $ 122,229 $ 121,922 $ 113,494
Recorded Investment of Loans 12,737,292   12,201,387      
Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 128,584   122,947      
Recorded Investment of Loans $ 11,377,591   $ 11,000,212      
Ratio 1.10%   1.10%      
Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 82   $ 126      
Recorded Investment of Loans $ 113,557   $ 28,553      
Ratio 0.10%   0.40%      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 34,401 34,144 $ 36,892 38,111 37,164 37,796
Recorded Investment of Loans 5,745,598   5,711,004      
Single-family residential | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 34,401   36,892      
Recorded Investment of Loans $ 5,726,737   $ 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 Allocation $ 0   $ 0      
Recorded Investment of Loans $ 24,139   $ 5,552      
Ratio 0.00%   0.00%      
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 30,133 27,389 $ 24,556 21,866 25,061 19,838
Recorded Investment of Loans 1,885,034   1,597,996      
Construction | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 30,133   24,556      
Recorded Investment of Loans $ 1,007,676   $ 793,958      
Ratio 3.00%   3.10%      
Construction | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 4,563   $ 0      
Ratio 0.00%   0.00%      
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 2,014 2,081 $ 1,944 1,890 1,176 1,080
Recorded Investment of Loans 612,688   602,631      
Construction - custom | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 2,014   1,944      
Recorded Investment of Loans $ 285,858   $ 277,495      
Ratio 0.70%   0.70%      
Construction - custom | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 0   $ 105      
Ratio 0.00%   0.00%      
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 7,700 7,622 $ 6,829 7,217 6,669 6,023
Recorded Investment of Loans 150,936   124,308      
Land - acquisition & development | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 7,700   6,828      
Recorded Investment of Loans $ 118,323   $ 104,767      
Ratio 6.50%   6.50%      
Land - acquisition & development | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 1      
Recorded Investment of Loans $ 3,184   $ 89      
Ratio 0.00%   1.00%      
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 2,907 2,853 $ 2,649 2,548 2,513 2,535
Recorded Investment of Loans 103,118   104,405      
Land - consumer lot loans | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 2,907   2,649      
Recorded Investment of Loans $ 97,310   $ 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 Allocation $ 0   $ 0      
Recorded Investment of Loans $ 833   $ 171      
Ratio 0.00%   0.00%      
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 8,091 7,982 $ 7,862 7,912 7,929 6,925
Recorded Investment of Loans 1,346,534   1,303,148      
Multi-family | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 8,086   7,857      
Recorded Investment of Loans $ 1,343,468   $ 1,302,625      
Ratio 0.60%   0.60%      
Multi-family | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 5   $ 5      
Recorded Investment of Loans $ 3,045   $ 493      
Ratio 0.20%   1.00%      
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 11,579 11,588 $ 11,818 11,347 10,772 8,588
Recorded Investment of Loans 1,435,418   1,434,610      
Commercial real estate | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 11,502   11,698      
Recorded Investment of Loans $ 1,388,029   $ 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 Allocation $ 77   $ 120      
Recorded Investment of Loans $ 31,805   $ 21,765      
Ratio 0.20%   0.60%      
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 27,515 29,330 $ 28,524 29,172 28,365 28,008
Recorded Investment of Loans 1,133,075   1,093,360      
Commercial & industrial | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 27,515   28,524      
Recorded Investment of Loans $ 1,087,664   $ 1,093,210      
Ratio 2.50%   2.60%      
Commercial & industrial | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 45,400   $ 81      
Ratio 0.00%   0.00%      
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 811 802 $ 855 877 826 813
Recorded Investment of Loans 136,766   144,850      
HELOC | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 811   855      
Recorded Investment of Loans $ 134,522   $ 141,689      
Ratio 0.60%   0.60%      
HELOC | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 562   $ 215      
Ratio 0.00%   0.00%      
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 3,515 $ 3,785 $ 1,144 $ 1,289 $ 1,447 $ 1,888
Recorded Investment of Loans 188,125   85,075      
Consumer | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 3,515   1,144      
Recorded Investment of Loans $ 188,004   $ 84,887      
Ratio 1.90%   1.40%      
Consumer | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 26   $ 82      
Ratio 0.00%   0.00%