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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, 2017 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 243,976 | $ 251,274
Unpaid Principal Balance | 255,925 | 289,340
Related Allowance | 4,047 | 4,156
Average Recorded Investment | 247,625 | 274,530
Amount of related allowance included in specific reserves | 635 | 126
Amount of related allowance included in general reserves | 3,412 | 4,030
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 44,801 | 43,897
Unpaid Principal Balance | 51,970 | 75,267
Related Allowance | 0 | 0
Average Recorded Investment | 44,349 | 40,392
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 199,175 | 207,377
Unpaid Principal Balance | 203,955 | 214,073
Related Allowance | 4,047 | 4,156
Average Recorded Investment | 203,276 | 234,138
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 191,082 | 203,266
Unpaid Principal Balance | 196,022 | 210,047
Related Allowance | 3,412 | 4,030
Average Recorded Investment | 197,172 | 224,094
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 20,405 | 21,325
Unpaid Principal Balance | 21,860 | 23,880
Related Allowance | 0 | 0
Average Recorded Investment | 20,864 | 19,371
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 170,677 | 181,941
Unpaid Principal Balance | 174,162 | 186,167
Related Allowance | 3,412 | 4,030
Average Recorded Investment | 176,308 | 204,723
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 969 |
Unpaid Principal Balance | 969 |
Related Allowance | 0 |
Average Recorded Investment | 485 |
Construction | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 969 |
Unpaid Principal Balance | 969 |
Related Allowance | 0 |
Average Recorded Investment | 485 |
Construction, custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment | 74 | 231
Construction, custom | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 148
Unpaid Principal Balance | 0 | 165
Related Allowance | 0 | 0
Average Recorded Investment | 74 | 231
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,376 | 420
Unpaid Principal Balance | 1,405 | 8,298
Related Allowance | 0 | 1
Average Recorded Investment | 898 | 752
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,376 | 330
Unpaid Principal Balance | 1,405 | 8,208
Related Allowance | 0 | 0
Average Recorded Investment | 853 | 176
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 90
Unpaid Principal Balance | 0 | 90
Related Allowance | 0 | 1
Average Recorded Investment | 45 | 576
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,705 | 8,157
Unpaid Principal Balance | 8,151 | 8,856
Related Allowance | 0 | 0
Average Recorded Investment | 7,931 | 9,407
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 300 | 208
Unpaid Principal Balance | 375 | 330
Related Allowance | 0 | 0
Average Recorded Investment | 254 | 431
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,405 | 7,949
Unpaid Principal Balance | 7,776 | 8,526
Related Allowance | 0 | 0
Average Recorded Investment | 7,677 | 8,976
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 730 | 632
Unpaid Principal Balance | 734 | 3,724
Related Allowance | 5 | 5
Average Recorded Investment | 682 | 1,772
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 250 | 139
Unpaid Principal Balance | 254 | 3,231
Related Allowance | 0 | 0
Average Recorded Investment | 195 | 748
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 480 | 493
Unpaid Principal Balance | 480 | 493
Related Allowance | 5 | 5
Average Recorded Investment | 487 | 1,024
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 28,282 | 27,969
Unpaid Principal Balance | 34,475 | 39,194
Related Allowance | 106 | 120
Average Recorded Investment | 28,126 | 28,457
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 16,372 | 12,890
Unpaid Principal Balance | 21,720 | 22,487
Related Allowance | 0 | 0
Average Recorded Investment | 14,631 | 11,466
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,910 | 15,079
Unpaid Principal Balance | 12,755 | 16,707
Related Allowance | 106 | 120
Average Recorded Investment | 13,495 | 16,991
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,695 | 8,279
Unpaid Principal Balance | 11,762 | 14,321
Related Allowance | 524 | 0
Average Recorded Investment | 9,987 | 7,722
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 4,439 | 8,279
Unpaid Principal Balance | 4,506 | 14,321
Related Allowance | 0 | 0
Average Recorded Investment | 6,359 | 7,425
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,256 | 0
Unpaid Principal Balance | 7,256 | 0
Related Allowance | 524 | 0
Average Recorded Investment | 3,628 | 297
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,976 | 2,218
Unpaid Principal Balance | 2,182 | 3,018
Related Allowance | 0 | 0
Average Recorded Investment | 2,097 | 1,938
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 620 | 490
Unpaid Principal Balance | 747 | 1,212
Related Allowance | 0 | 0
Average Recorded Investment | 555 | 487
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,356 | 1,728
Unpaid Principal Balance | 1,435 | 1,806
Related Allowance | 0 | 0
Average Recorded Investment | 1,542 | 1,451
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 161 | 185
Unpaid Principal Balance | 225 | 1,717
Related Allowance | 0 | 0
Average Recorded Investment | 173 | 157
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 70 | 88
Unpaid Principal Balance | 134 | 1,433
Related Allowance | 0 | 0
Average Recorded Investment | 79 | 57
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 91 | 97
Unpaid Principal Balance | 91 | 284
Related Allowance | 0 | 0
Average Recorded Investment | $ 94 | $ 100

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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