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Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | $ 129,257 | $ 123,073
Charge-offs | (11,476) | (5,932)
Recoveries | 15,053 | 16,982
Provision & Transfers | (1,300) | (4,866)
Ending Allowance | 131,534 | 129,257
Single-family residential |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 33,033 | 36,892
Charge-offs | (268) | (1,142)
Recoveries | 1,020 | 757
Provision & Transfers | (2,797) | (3,474)
Ending Allowance | 30,988 | 33,033
Construction |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 31,317 | 24,556
Charge-offs | 0 | 0
Recoveries | 99 | 0
Provision & Transfers | 888 | 6,761
Ending Allowance | 32,304 | 31,317
Construction - custom |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 1,842 | 1,944
Charge-offs | (1,973) | (50)
Recoveries | 0 | 0
Provision & Transfers | 1,500 | (52)
Ending Allowance | 1,369 | 1,842
Land - acquisition & development |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 7,978 | 6,829
Charge-offs | (107) | (13)
Recoveries | 7,457 | 14,223
Provision & Transfers | (6,173) | (13,061)
Ending Allowance | 9,155 | 7,978
Land - consumer lot loans |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 2,164 | 2,649
Charge-offs | (804) | (67)
Recoveries | 719 | 35
Provision & Transfers | 64 | (453)
Ending Allowance | 2,143 | 2,164
Multi-family |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 8,329 | 7,862
Charge-offs | 0 | 0
Recoveries | 0 | 0
Provision & Transfers | (938) | 467
Ending Allowance | 7,391 | 8,329
Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 11,852 | 11,818
Charge-offs | (428) | (36)
Recoveries | 1,102 | 189
Provision & Transfers | 644 | (119)
Ending Allowance | 13,170 | 11,852
Commercial & industrial |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 28,702 | 28,524
Charge-offs | (5,782) | (3,574)
Recoveries | 3,443 | 714
Provision & Transfers | 5,087 | 3,038
Ending Allowance | 31,450 | 28,702
HELOC |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 781 | 855
Charge-offs | (1,086) | (668)
Recoveries | 46 | 71
Provision & Transfers | 1,362 | 523
Ending Allowance | 1,103 | 781
Consumer |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Allowance | 3,259 | 1,144
Charge-offs | (1,028) | (382)
Recoveries | 1,167 | 993
Provision & Transfers | (937) | 1,504
Ending Allowance | $ 2,461 | $ 3,259

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