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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, 2016 | Sep. 30, 2016
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 283,752 | $ 285,243
Unpaid Principal Balance | 323,299 | 321,743
Related Allowance | 4,754 | 3,915
Average Recorded Investment | 271,198 | 265,771
Amount of related allowance included in specific reserves | 367 | 366
Amount of related allowance included in general reserves | 4,387 | 3,549
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 39,424 | 23,712
Unpaid Principal Balance | 68,029 | 50,196
Related Allowance | 0 | 0
Average Recorded Investment | 29,752 | 15,479
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 244,328 | 261,531
Unpaid Principal Balance | 255,270 | 271,547
Related Allowance | 4,754 | 3,915
Average Recorded Investment | 241,446 | 250,292
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 227,534 | 237,813
Unpaid Principal Balance | 233,727 | 243,961
Related Allowance | 4,502 | 3,809
Average Recorded Investment | 221,547 | 223,143
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 15,488 | 9,627
Unpaid Principal Balance | 17,258 | 11,366
Related Allowance | 0 | 0
Average Recorded Investment | 11,050 | 6,511
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 212,046 | 228,186
Unpaid Principal Balance | 216,469 | 232,595
Related Allowance | 4,502 | 3,809
Average Recorded Investment | 210,497 | 216,632
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,016 | 1,292
Unpaid Principal Balance | 10,187 | 11,095
Related Allowance | 2 | 1
Average Recorded Investment | 1,003 | 2,380
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 165 | 138
Unpaid Principal Balance | 8,396 | 9,001
Related Allowance | 0 | 0
Average Recorded Investment | 152 | 614
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 851 | 1,154
Unpaid Principal Balance | 1,791 | 2,094
Related Allowance | 2 | 1
Average Recorded Investment | 851 | 1,766
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,769 | 10,129
Unpaid Principal Balance | 10,879 | 11,287
Related Allowance | 41 | 1
Average Recorded Investment | 9,527 | 9,865
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 713 | 499
Unpaid Principal Balance | 765 | 609
Related Allowance | 0 | 0
Average Recorded Investment | 525 | 317
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,056 | 9,630
Unpaid Principal Balance | 10,114 | 10,678
Related Allowance | 41 | 1
Average Recorded Investment | 9,002 | 9,548
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,656 | 1,899
Unpaid Principal Balance | 6,592 | 5,477
Related Allowance | 12 | 13
Average Recorded Investment | 2,469 | 2,160
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,160 | 394
Unpaid Principal Balance | 5,096 | 3,972
Related Allowance | 0 | 0
Average Recorded Investment | 968 | 638
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,496 | 1,505
Unpaid Principal Balance | 1,496 | 1,505
Related Allowance | 12 | 13
Average Recorded Investment | 1,501 | 1,522
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 29,653 | 31,175
Unpaid Principal Balance | 41,326 | 44,149
Related Allowance | 197 | 91
Average Recorded Investment | 28,931 | 25,571
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,407 | 11,741
Unpaid Principal Balance | 19,829 | 21,301
Related Allowance | 0 | 0
Average Recorded Investment | 11,180 | 6,260
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 18,246 | 19,434
Unpaid Principal Balance | 21,497 | 22,848
Related Allowance | 197 | 91
Average Recorded Investment | 17,751 | 19,311
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,036 | 1,030
Unpaid Principal Balance | 17,479 | 3,082
Related Allowance | 0 | 0
Average Recorded Investment | 6,033 | 863
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 9,680 | 1,030
Unpaid Principal Balance | 15,065 | 3,082
Related Allowance | 0 | 0
Average Recorded Investment | 5,355 | 863
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,356 |
Unpaid Principal Balance | 2,414 |
Related Allowance | 0 |
Average Recorded Investment | 678 |
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,967 | 1,715
Unpaid Principal Balance | 2,246 | 1,836
Related Allowance | 0 | 0
Average Recorded Investment | 1,559 | 1,578
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 767 | 209
Unpaid Principal Balance | 1,028 | 315
Related Allowance | 0 | 0
Average Recorded Investment | 471 | 165
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,200 | 1,506
Unpaid Principal Balance | 1,218 | 1,521
Related Allowance | 0 | 0
Average Recorded Investment | 1,088 | 1,413
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 121 | 190
Unpaid Principal Balance | 863 | 856
Related Allowance | 0 | 0
Average Recorded Investment | 129 | 211
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 44 | 74
Unpaid Principal Balance | 592 | 550
Related Allowance | 0 | 0
Average Recorded Investment | 51 | 111
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 77 | 116
Unpaid Principal Balance | 271 | 306
Related Allowance | 0 | 0
Average Recorded Investment | $ 78 | $ 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=66008989&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=66008989&loc=SL6953423-111524 + Details
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