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Allowance for Losses on Loans (Tables) | 3 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Summary of Activity in Allowance for Loan Losses | The following tables summarize the activity in the allowance for loan losses.
Three Months Ended December 31, 2017 | Beginning Allowance |  | Charge-offs |  | Recoveries |  | Provision & Transfers |  | Ending Allowance
| (In thousands)
Single-family residential | $ | 36,892 |  |  | $ | (461 | ) |  | $ | 121 |  |  | $ | (624 | ) |  | $ | 35,928 |
Construction | 24,556 |  |  | — |  |  | — |  |  | 658 |  |  | 25,214 |
Construction - custom | 1,944 |  |  | (50 | ) |  | — |  |  | 158 |  |  | 2,052 |
Land - acquisition & development | 6,829 |  |  | — |  |  | 3,372 |  |  | (2,846 | ) |  | 7,355 |
Land - consumer lot loans | 2,649 |  |  | (47 | ) |  | — |  |  | 304 |  |  | 2,906 |
Multi-family | 7,862 |  |  | — |  |  | — |  |  | 42 |  |  | 7,904 |
Commercial real estate | 11,818 |  |  | — |  |  | — |  |  | (193 | ) |  | 11,625 |
Commercial & industrial | 28,524 |  |  | (116 | ) |  | 55 |  |  | 805 |  |  | 29,268 |
HELOC | 855 |  |  | — |  |  | — |  |  | (47 | ) |  | 808 |
Consumer | 1,144 |  |  | (78 | ) |  | 286 |  |  | 2,743 |  |  | 4,095 |
| $ | 123,073 |  |  | $ | (752 | ) |  | $ | 3,834 |  |  | $ | 1,000 |  |  | $ | 127,155 |
Three Months Ended December 31, 2016 | Beginning Allowance |  | Charge-offs |  | Recoveries |  | Provision & Transfers |  | Ending Allowance
| (In thousands)
Single-family residential | $ | 37,796 |  |  | $ | (115 | ) |  | $ | 151 |  |  | $ | 374 |  |  | $ | 38,206 |
Construction | 19,838 |  |  | — |  |  | — |  |  | 2,096 |  |  | 21,934 |
Construction - custom | 1,080 |  |  | — |  |  | — |  |  | 30 |  |  | 1,110 |
Land - acquisition & development | 6,023 |  |  | (20 | ) |  | 4,018 |  |  | (3,356 | ) |  | 6,665 |
Land - consumer lot loans | 2,535 |  |  | (17 | ) |  | 70 |  |  | (87 | ) |  | 2,501 |
Multi-family | 6,925 |  |  | — |  |  | — |  |  | 704 |  |  | 7,629 |
Commercial real estate | 8,588 |  |  | (11 | ) |  | 356 |  |  | 1,235 |  |  | 10,168 |
Commercial & industrial | 28,008 |  |  | (58 | ) |  | 725 |  |  | (939 | ) |  | 27,736 |
HELOC | 813 |  |  | (37 | ) |  | 1 |  |  | 55 |  |  | 832 |
Consumer | 1,888 |  |  | (146 | ) |  | 379 |  |  | (446 | ) |  | 1,675 |
| $ | 113,494 |  |  | $ | (404 | ) |  | $ | 5,700 |  |  | $ | (334 | ) |  | $ | 118,456 |
Summary of Loans Collectively and Individually Evaluated for Impairment and Related Allocation of Reserves | The following tables show loans collectively and individually evaluated for impairment and the related allocation of general and specific reserves.
December 31, 2017 | Loans Collectively Evaluated for Impairment |  | Loans Individually Evaluated for Impairment
| Allowance Allocation |  | Recorded Investment of Loans |  | Ratio |  | Allowance Allocation |  | Recorded Investment of Loans |  | Ratio
| (In thousands) |  |  |  | (In thousands)
Single-family residential | $ | 35,928 |  |  | $ | 5,676,565 |  |  | 0.6 | % |  | $ | — |  |  | $ | 24,083 |  |  | — | %
Construction | 25,214 |  |  | 851,800 |  |  | 3.0 |  |  | — |  |  | 364 |  |  | — |
Construction - custom | 2,052 |  |  | 292,255 |  |  | 0.7 |  |  | — |  |  | — |  |  | — |
Land - acquisition & development | 7,355 |  |  | 110,884 |  |  | 6.6 |  |  | — |  |  | 1,376 |  |  | — |
Land - consumer lot loans | 2,906 |  |  | 97,291 |  |  | 3.0 |  |  | — |  |  | 416 |  |  | — |
Multi-family | 7,899 |  |  | 1,311,943 |  |  | 0.6 |  |  | 5 |  |  | 730 |  |  | 0.7 |
Commercial real estate | 11,519 |  |  | 1,389,749 |  |  | 0.8 |  |  | 106 |  |  | 27,535 |  |  | 0.4 |
Commercial & industrial | 28,744 |  |  | 1,108,961 |  |  | 2.6 |  |  | 524 |  |  | 11,694 |  |  | 4.5 |
HELOC | 808 |  |  | 134,320 |  |  | 0.6 |  |  | — |  |  | 620 |  |  | — |
Consumer | 4,095 |  |  | 219,784 |  |  | 1.9 |  |  | — |  |  | 70 |  |  | — |
| $ | 126,520 |  |  | $ | 11,193,552 |  |  | 1.1 | % |  | $ | 635 |  |  | $ | 66,888 |  |  | 0.9 | %
September 30, 2017 | Loans Collectively Evaluated for Impairment |  | Loans Individually Evaluated for Impairment
| Allowance Allocation |  | Recorded Investment of Loans |  | Ratio |  | Allowance Allocation |  | Recorded Investment of Loans |  | Ratio
| (In thousands) |  |  |  | (In thousands)
Single-family residential | $ | 36,893 |  |  | $ | 5,713,576 |  |  | 0.7 | % |  | $ | — |  |  | $ | 5,552 |  |  | — | %
Construction | 24,556 |  |  | 793,958 |  |  | 3.1 |  |  | — |  |  | — |  |  | — |
Construction - custom | 1,944 |  |  | 277,495 |  |  | 0.7 |  |  | — |  |  | 105 |  |  | — |
Land - acquisition & development | 6,828 |  |  | 104,767 |  |  | 6.5 |  |  | 1 |  |  | 89 |  |  | 1.0 |
Land - consumer lot loans | 2,649 |  |  | 96,337 |  |  | 2.8 |  |  | — |  |  | 171 |  |  | — |
Multi-family | 7,857 |  |  | 1,302,625 |  |  | 0.6 |  |  | 5 |  |  | 493 |  |  | 1.0 |
Commercial real estate | 11,697 |  |  | 1,391,668 |  |  | 0.8 |  |  | 120 |  |  | 21,765 |  |  | 0.6 |
Commercial & industrial | 28,524 |  |  | 1,093,210 |  |  | 2.6 |  |  | — |  |  | 81 |  |  | — |
HELOC | 855 |  |  | 141,689 |  |  | 0.6 |  |  | — |  |  | 215 |  |  | — |
Consumer | 1,144 |  |  | 84,887 |  |  | 1.4 |  |  | — |  |  | 82 |  |  | — |
| $ | 122,947 |  |  | $ | 11,000,212 |  |  | 1.1 | % |  | $ | 126 |  |  | $ | 28,553 |  |  | 0.4 | %
Summary of Loans Based on Credit Quality Indicators | The following tables provide information on loans based on risk rating categories as defined above.
December 31, 2017 | Internally Assigned Grade |  |
| Pass |  | Special mention |  | Substandard |  | Doubtful |  | Loss |  | Total Gross Loans
| (In thousands)
Loan type |  |  |  |  |  |  |  |  |  |  |
Single-family residential | $ | 5,657,731 |  |  | $ | — |  |  | $ | 35,587 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,693,318 |
Construction | 1,707,044 |  |  | — |  |  | 3,374 |  |  | — |  |  | — |  |  | 1,710,418 |
Construction - custom | 583,580 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 583,580 |
Land - acquisition & development | 134,625 |  |  | — |  |  | 2,313 |  |  | — |  |  | — |  |  | 136,938 |
Land - consumer lot loans | 104,105 |  |  | — |  |  | 981 |  |  | — |  |  | — |  |  | 105,086 |
Multi-family | 1,304,991 |  |  | 3,159 |  |  | 4,545 |  |  | — |  |  | — |  |  | 1,312,695 |
Commercial real estate | 1,401,236 |  |  | 3,764 |  |  | 31,508 |  |  | — |  |  | — |  |  | 1,436,508 |
Commercial & industrial | 1,077,207 |  |  | 10,423 |  |  | 33,077 |  |  | — |  |  | — |  |  | 1,120,707 |
HELOC | 136,287 |  |  | — |  |  | 708 |  |  | — |  |  | — |  |  | 136,995 |
Consumer | 219,899 |  |  | — |  |  | 72 |  |  | — |  |  | — |  |  | 219,971 |
Total gross loans | $ | 12,326,705 |  |  | $ | 17,346 |  |  | $ | 112,165 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,456,216 |
Total grade as a % of total gross loans | 99.0 | % |  | 0.1 | % |  | 0.9 | % |  | — | % |  | — | % |  |
September 30, 2017 | Internally Assigned Grade |  |
| Pass |  | Special mention |  | Substandard |  | Doubtful |  | Loss |  | Total Gross Loans
| (In thousands)
Loan type |  |  |  |  |  |  |  |  |  |  |
Single-family residential | $ | 5,671,229 |  |  | $ | — |  |  | $ | 39,775 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,711,004 |
Construction | 1,594,926 |  |  | — |  |  | 3,070 |  |  | — |  |  | — |  |  | 1,597,996 |
Construction - custom | 602,540 |  |  | — |  |  | 91 |  |  | — |  |  | — |  |  | 602,631 |
Land - acquisition & development | 123,028 |  |  | 207 |  |  | 1,073 |  |  | — |  |  | — |  |  | 124,308 |
Land - consumer lot loans | 103,787 |  |  | — |  |  | 618 |  |  | — |  |  | — |  |  | 104,405 |
Multi-family | 1,295,261 |  |  | 5,795 |  |  | 2,092 |  |  | — |  |  | — |  |  | 1,303,148 |
Commercial real estate | 1,391,996 |  |  | 5,944 |  |  | 36,670 |  |  | — |  |  | — |  |  | 1,434,610 |
Commercial & industrial | 1,054,972 |  |  | 14,814 |  |  | 23,574 |  |  | — |  |  | — |  |  | 1,093,360 |
HELOC | 144,229 |  |  | — |  |  | 621 |  |  | — |  |  | — |  |  | 144,850 |
Consumer | 84,984 |  |  | — |  |  | 91 |  |  | — |  |  | — |  |  | 85,075 |
Total gross loans | $ | 12,066,952 |  |  | $ | 26,760 |  |  | $ | 107,675 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,201,387 |
Total grade as a % of total gross loans | 98.9 | % |  | 0.2 | % |  | 0.9 | % |  | — | % |  | — | % |  |
The following tables provide information on gross loans based on borrower payment activity.
December 31, 2017 | Performing Loans |  | Non-Performing Loans
| Amount |  | % of Total Gross Loans |  | Amount |  | % of Total Gross Loans
| (In thousands)
Single-family residential | $ | 5,667,099 |  |  | 99.5 | % |  | $ | 26,219 |  |  | 0.5 | %
Construction | 1,710,054 |  |  | 100.0 |  |  | 364 |  |  | — |
Construction - custom | 583,580 |  |  | 100.0 |  |  | — |  |  | — |
Land - acquisition & development | 135,612 |  |  | 99.0 |  |  | 1,326 |  |  | 1.0 |
Land - consumer lot loans | 104,110 |  |  | 99.1 |  |  | 976 |  |  | 0.9 |
Multi-family | 1,312,445 |  |  | 100.0 |  |  | 250 |  |  | — |
Commercial real estate | 1,428,267 |  |  | 99.4 |  |  | 8,241 |  |  | 0.6 |
Commercial & industrial | 1,113,111 |  |  | 99.3 |  |  | 7,596 |  |  | 0.7 |
HELOC | 136,519 |  |  | 99.7 |  |  | 476 |  |  | 0.3 |
Consumer | 219,899 |  |  | 100.0 |  |  | 72 |  |  | — |
| $ | 12,410,696 |  |  | 99.6 | % |  | $ | 45,520 |  |  | 0.4 | %
September 30, 2017 | Performing Loans |  | Non-Performing Loans
| Amount |  | % of Total Gross Loans |  | Amount |  | % of Total Gross Loans
| (In thousands)
Single-family residential | $ | 5,683,074 |  |  | 99.5 | % |  | $ | 27,930 |  |  | 0.5 | %
Construction | 1,597,996 |  |  | 100.0 |  |  | — |  |  | — |
Construction - custom | 602,540 |  |  | 99.9 |  |  | 91 |  |  | 0.1 |
Land - acquisition & development | 124,012 |  |  | 99.8 |  |  | 296 |  |  | 0.2 |
Land - consumer lot loans | 103,800 |  |  | 99.4 |  |  | 605 |  |  | 0.6 |
Multi-family | 1,303,009 |  |  | 99.9 |  |  | 139 |  |  | 0.1 |
Commercial real estate | 1,422,795 |  |  | 99.2 |  |  | 11,815 |  |  | 0.8 |
Commercial & industrial | 1,085,278 |  |  | 99.3 |  |  | 8,082 |  |  | 0.7 |
HELOC | 144,319 |  |  | 99.6 |  |  | 531 |  |  | 0.4 |
Consumer | 84,984 |  |  | 99.9 |  |  | 91 |  |  | 0.1 |
| $ | 12,151,807 |  |  | 99.6 | % |  | $ | 49,580 |  |  | 0.4 | %
Summary of Impaired Loans Based on Type | The following tables provide information on impaired loan balances and the related allowances by loan types.
December 31, 2017 | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance |  | Average Recorded Investment
| (In thousands)
Impaired loans with no related allowance recorded: |  |  |  |  |  |  |
Single-family residential | $ | 20,405 |  |  | $ | 21,860 |  |  | $ | — |  |  | $ | 20,864 |
Construction | 969 |  |  | 969 |  |  | — |  |  | 485 |
Construction - custom | — |  |  | — |  |  | — |  |  | 74 |
Land - acquisition & development | 1,376 |  |  | 1,405 |  |  | — |  |  | 853 |
Land - consumer lot loans | 300 |  |  | 375 |  |  | — |  |  | 254 |
Multi-family | 250 |  |  | 254 |  |  | — |  |  | 195 |
Commercial real estate | 16,372 |  |  | 21,720 |  |  | — |  |  | 14,631 |
Commercial & industrial | 4,439 |  |  | 4,506 |  |  | — |  |  | 6,359 |
HELOC | 620 |  |  | 747 |  |  | — |  |  | 555 |
Consumer | 70 |  |  | 134 |  |  | — |  |  | 79 |
| 44,801 |  |  | 51,970 |  |  | — |  |  | 44,349 |
Impaired loans with an allowance recorded: |  |  |  |  |  |  |
Single-family residential | 170,677 |  |  | 174,162 |  |  | 3,412 |  |  | 176,308 |
Land - acquisition & development | — |  |  | — |  |  | — |  |  | 45 |
Land - consumer lot loans | 7,405 |  |  | 7,776 |  |  | — |  |  | 7,677 |
Multi-family | 480 |  |  | 480 |  |  | 5 |  |  | 487 |
Commercial real estate | 11,910 |  |  | 12,755 |  |  | 106 |  |  | 13,495 |
Commercial & industrial | 7,256 |  |  | 7,256 |  |  | 524 |  |  | 3,628 |
HELOC | 1,356 |  |  | 1,435 |  |  | — |  |  | 1,542 |
Consumer | 91 |  |  | 91 |  |  | — |  |  | 94 |
| 199,175 |  |  | 203,955 |  |  | 4,047 |  | (1) | 203,276 |
Total impaired loans: |  |  |  |  |  |  |
Single-family residential | 191,082 |  |  | 196,022 |  |  | 3,412 |  |  | 197,172 |
Construction | 969 |  |  | 969 |  |  | — |  |  | 485 |
Construction - custom | — |  |  | — |  |  | — |  |  | 74 |
Land - acquisition & development | 1,376 |  |  | 1,405 |  |  | — |  |  | 898 |
Land - consumer lot loans | 7,705 |  |  | 8,151 |  |  | — |  |  | 7,931 |
Multi-family | 730 |  |  | 734 |  |  | 5 |  |  | 682 |
Commercial real estate | 28,282 |  |  | 34,475 |  |  | 106 |  |  | 28,126 |
Commercial & industrial | 11,695 |  |  | 11,762 |  |  | 524 |  |  | 9,987 |
HELOC | 1,976 |  |  | 2,182 |  |  | — |  |  | 2,097 |
Consumer | 161 |  |  | 225 |  |  | — |  |  | 173 |
| $ | 243,976 |  |  | $ | 255,925 |  |  | $ | 4,047 |  | (1) | $ | 247,625 |
(1) | Includes $635,000 of specific reserves and $3,412,000 included in the general reserves.
September 30, 2017 | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance |  | Average Recorded Investment
| (In thousands)
Impaired loans with no related allowance recorded: |  |  |  |  |  |  |
Single-family residential | $ | 21,325 |  |  | $ | 23,880 |  |  | $ | — |  |  | $ | 19,371 |
Construction - custom | 148 |  |  | 165 |  |  | — |  |  | 231 |
Land - acquisition & development | 330 |  |  | 8,208 |  |  | — |  |  | 176 |
Land - consumer lot loans | 208 |  |  | 330 |  |  | — |  |  | 431 |
Multi-family | 139 |  |  | 3,231 |  |  | — |  |  | 748 |
Commercial real estate | 12,890 |  |  | 22,487 |  |  | — |  |  | 11,466 |
Commercial & industrial | 8,279 |  |  | 14,321 |  |  | — |  |  | 7,425 |
HELOC | 490 |  |  | 1,212 |  |  | — |  |  | 487 |
Consumer | 88 |  |  | 1,433 |  |  | — |  |  | 57 |
| 43,897 |  |  | 75,267 |  |  | — |  |  | 40,392 |
Impaired loans with an allowance recorded: |  |  |  |  |  |  |
Single-family residential | 181,941 |  |  | 186,167 |  |  | 4,030 |  |  | 204,723 |
Land - acquisition & development | 90 |  |  | 90 |  |  | 1 |  |  | 576 |
Land - consumer lot loans | 7,949 |  |  | 8,526 |  |  | — |  |  | 8,976 |
Multi-family | 493 |  |  | 493 |  |  | 5 |  |  | 1,024 |
Commercial real estate | 15,079 |  |  | 16,707 |  |  | 120 |  |  | 16,991 |
Commercial & industrial | — |  |  | — |  |  | — |  |  | 297 |
HELOC | 1,728 |  |  | 1,806 |  |  | — |  |  | 1,451 |
Consumer | 97 |  |  | 284 |  |  | — |  |  | 100 |
| 207,377 |  |  | 214,073 |  |  | 4,156 |  | (1) | 234,138 |
Total impaired loans: |  |  |  |  |  |  |
Single-family residential | 203,266 |  |  | 210,047 |  |  | 4,030 |  |  | 224,094 |
Construction - custom | 148 |  |  | 165 |  |  | — |  |  | 231 |
Land - acquisition & development | 420 |  |  | 8,298 |  |  | 1 |  |  | 752 |
Land - consumer lot loans | 8,157 |  |  | 8,856 |  |  | — |  |  | 9,407 |
Multi-family | 632 |  |  | 3,724 |  |  | 5 |  |  | 1,772 |
Commercial real estate | 27,969 |  |  | 39,194 |  |  | 120 |  |  | 28,457 |
Commercial & industrial | 8,279 |  |  | 14,321 |  |  | — |  |  | 7,722 |
HELOC | 2,218 |  |  | 3,018 |  |  | — |  |  | 1,938 |
Consumer | 185 |  |  | 1,717 |  |  | — |  |  | 157 |
| $ | 251,274 |  |  | $ | 289,340 |  |  | $ | 4,156 |  | (1) | $ | 274,530 |
(1) | Includes $126,000 of specific reserves and $4,030,000 included in the general reserves

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=82894031&loc=SL6953803-111525 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953659-111524 + Details
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- Definition Tabular disclosure of impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Schedule of Loans Collectively and Individually Evaluated for Impairment [Table Text Block] + References No definition available. + Details
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