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Allowance for Losses on Loans - Impaired Loans Based on Loan Types (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 187,634 | $ 199,545
Unpaid Principal Balance | 202,500 | 214,712
Related Allowance | 2,998 | 3,388
Average Recorded Investment (Year-To-Date) | 193,593 | 228,398
Amount of related allowance included in specific reserves | 500 | 517
Amount of related allowance included in general reserves | 2,498 | 2,871
Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 37,941 | 42,687
Unpaid Principal Balance | 44,931 | 49,425
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 40,316 | 43,292
Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 149,693 | 156,858
Unpaid Principal Balance | 157,569 | 165,287
Related Allowance | 2,998 | 3,388
Average Recorded Investment (Year-To-Date) | 153,277 | 185,106
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 149,246 | 158,668
Unpaid Principal Balance | 153,509 | 163,149
Related Allowance | 2,498 | 2,871
Average Recorded Investment (Year-To-Date) | 153,957 | 181,826
Single-family residential | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 15,438 | 18,872
Unpaid Principal Balance | 16,633 | 20,050
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 17,155 | 20,097
Single-family residential | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 133,808 | 139,796
Unpaid Principal Balance | 136,876 | 143,099
Related Allowance | 2,498 | 2,871
Average Recorded Investment (Year-To-Date) | 136,802 | 161,729
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,630 | 2,698
Unpaid Principal Balance | 1,750 | 2,818
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 2,164 | 1,349
Construction | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,630 | 2,698
Unpaid Principal Balance | 1,750 | 2,818
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 2,164 | 1,349
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 74
Construction - custom | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 74
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 438 | 921
Unpaid Principal Balance | 491 | 971
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 680 | 611
Land - acquisition & development | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 335 | 814
Unpaid Principal Balance | 335 | 814
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 575 | 572
Land - acquisition & development | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 103 | 107
Unpaid Principal Balance | 156 | 157
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 105 | 39
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,782 | 5,227
Unpaid Principal Balance | 5,211 | 5,626
Related Allowance | 9 | 9
Average Recorded Investment (Year-To-Date) | 5,005 | 6,709
Land - consumer lot loans | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 181 | 311
Unpaid Principal Balance | 281 | 336
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 246 | 260
Land - consumer lot loans | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,601 | 4,916
Unpaid Principal Balance | 4,930 | 5,290
Related Allowance | 9 | 9
Average Recorded Investment (Year-To-Date) | 4,759 | 6,449
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 435 | 448
Unpaid Principal Balance | 435 | 448
Related Allowance | 4 | 4
Average Recorded Investment (Year-To-Date) | 442 | 541
Multi-family | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment |  | 0
Unpaid Principal Balance |  | 0
Related Allowance |  | 0
Average Recorded Investment (Year-To-Date) |  | 70
Multi-family | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 435 | 448
Unpaid Principal Balance | 435 | 448
Related Allowance | 4 | 4
Average Recorded Investment (Year-To-Date) | 442 | 471
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 15,497 | 15,679
Unpaid Principal Balance | 21,660 | 21,768
Related Allowance | 142 | 150
Average Recorded Investment (Year-To-Date) | 15,588 | 21,603
Commercial real estate | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,945 | 9,425
Unpaid Principal Balance | 15,035 | 14,035
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 9,685 | 11,158
Commercial real estate | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 5,552 | 6,254
Unpaid Principal Balance | 6,625 | 7,733
Related Allowance | 142 | 150
Average Recorded Investment (Year-To-Date) | 5,903 | 10,445
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 14,027 | 14,428
Unpaid Principal Balance | 17,557 | 17,652
Related Allowance | 345 | 354
Average Recorded Investment (Year-To-Date) | 14,228 | 13,703
Commercial & industrial | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,868 | 10,137
Unpaid Principal Balance | 10,055 | 10,146
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 10,003 | 9,208
Commercial & industrial | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,159 | 4,291
Unpaid Principal Balance | 7,502 | 7,506
Related Allowance | 345 | 354
Average Recorded Investment (Year-To-Date) | 4,225 | 4,495
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,487 | 1,386
Unpaid Principal Balance | 1,590 | 2,154
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 1,437 | 1,845
HELOC | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 519 | 410
Unpaid Principal Balance | 612 | 1,170
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 465 | 450
HELOC | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 968 | 976
Unpaid Principal Balance | 978 | 984
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 972 | 1,395
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 92 | 90
Unpaid Principal Balance | 297 | 126
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 92 | 137
Consumer | Impaired loans with no related allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 25 | 20
Unpaid Principal Balance | 230 | 56
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | 23 | 54
Consumer | Impaired loans with an allowance recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 67 | 70
Unpaid Principal Balance | 67 | 70
Related Allowance | 0 | 0
Average Recorded Investment (Year-To-Date) | $ 69 | $ 83

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