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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 139,501 $ 132,513 $ 131,534 $ 133,086 $ 131,165 $ 129,257
Recorded Investment of Loans 13,434,649   13,312,388      
Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 139,492   131,095      
Recorded Investment of Loans $ 12,110,082   $ 12,076,622      
Ratio 1.20%   1.10%      
Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 9   $ 439      
Recorded Investment of Loans $ 34,755   $ 34,425      
Ratio 0.00%   1.30%      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 29,280 30,700 $ 30,988 31,476 31,484 33,033
Recorded Investment of Loans 5,582,244   5,835,194      
Single-family residential | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 29,280   30,988      
Recorded Investment of Loans $ 5,566,786   $ 5,822,200      
Ratio 0.50%   0.50%      
Single-family residential | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 19,606   $ 17,978      
Ratio 0.00%   0.00%      
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 34,283 32,292 $ 32,304 33,396 31,463 31,317
Recorded Investment of Loans 2,204,283   2,038,052      
Construction | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 34,283   32,304      
Recorded Investment of Loans $ 1,232,378   $ 1,164,889      
Ratio 2.80%   2.80%      
Construction | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 3,353   $ 0      
Ratio 0.00%   0.00%      
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 1,580 1,399 $ 1,369 1,976 1,926 1,842
Recorded Investment of Loans 547,731   540,741      
Construction - custom | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 1,580   1,369      
Recorded Investment of Loans $ 270,880   $ 255,505      
Ratio 0.60%   0.50%      
Construction - custom | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 0   $ 0      
Ratio 0.00%   0.00%      
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 8,733 8,746 $ 9,155 9,734 9,156 7,978
Recorded Investment of Loans 197,010   204,107      
Land - acquisition & development | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 8,732   9,135      
Recorded Investment of Loans $ 152,541   $ 160,964      
Ratio 5.70%   5.70%      
Land - acquisition & development | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 1   $ 20      
Recorded Investment of Loans $ 82   $ 230      
Ratio 1.20%   8.70%      
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 2,106 2,090 $ 2,143 2,076 2,144 2,164
Recorded Investment of Loans 96,579   99,694      
Land - consumer lot loans | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 2,106   2,143      
Recorded Investment of Loans $ 92,881   $ 95,574      
Ratio 2.30%   2.20%      
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 $ 372   $ 375      
Ratio 0.00%   0.00%      
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 8,567 7,404 $ 7,391 7,394 7,884 8,329
Recorded Investment of Loans 1,467,231   1,422,674      
Multi-family | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 8,566   7,387      
Recorded Investment of Loans $ 1,466,892   $ 1,422,266      
Ratio 0.60%   0.50%      
Multi-family | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 1   $ 4      
Recorded Investment of Loans $ 316   $ 385      
Ratio 0.30%   1.00%      
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 15,020 13,035 $ 13,170 12,448 12,711 11,852
Recorded Investment of Loans 1,717,535   1,631,170      
Commercial real estate | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 15,016   12,847      
Recorded Investment of Loans $ 1,708,240   $ 1,618,406      
Ratio 0.90%   0.80%      
Commercial real estate | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 4   $ 323      
Recorded Investment of Loans $ 9,295   $ 12,765      
Ratio 0.00%   2.50%      
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 36,435 33,540 $ 31,450 30,574 30,279 28,702
Recorded Investment of Loans 1,371,128   1,268,695      
Commercial & industrial | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 36,432   31,358      
Recorded Investment of Loans $ 1,370,838   $ 1,266,913      
Ratio 2.70%   2.50%      
Commercial & industrial | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 3   $ 92      
Recorded Investment of Loans $ 855   $ 1,805      
Ratio 0.40%   5.10%      
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 1,282 1,104 $ 1,103 1,082 1,064 781
Recorded Investment of Loans 145,761   142,178      
HELOC | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 1,282   1,103      
Recorded Investment of Loans $ 144,119   $ 140,378      
Ratio 0.90%   0.80%      
HELOC | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 876   $ 837      
Ratio 0.00%   0.00%      
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 2,215 $ 2,203 $ 2,461 $ 2,930 $ 3,054 $ 3,259
Recorded Investment of Loans 105,147   129,883      
Consumer | Loans Collectively Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation 2,215   2,461      
Recorded Investment of Loans $ 104,527   $ 129,527      
Ratio 2.10%   1.90%      
Consumer | Loans Individually Evaluated for Impairment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance Allocation $ 0   $ 0      
Recorded Investment of Loans $ 0   $ 50      
Ratio 0.00%   0.00%