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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, 2015 | Sep. 30, 2015
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 313,924 | $ 341,579
Unpaid Principal Balance | 343,325 | 381,223
Related Allowance | 6,339 | 6,678
Average Recorded Investment | 311,146 | 333,815
Amount of related allowance included in specific reserves | 130 | 275
Amount of related allowance included in general reserves | 6,209 | 6,403
Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 26,811 | 38,866
Unpaid Principal Balance | 47,865 | 70,564
Related Allowance | 0 | 0
Average Recorded Investment | 22,840 | 29,474
Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 287,113 | 302,713
Unpaid Principal Balance | 295,460 | 310,659
Related Allowance | 6,339 | 6,678
Average Recorded Investment | 288,306 | 304,341
Single-family residential |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 261,001 | 276,711
Unpaid Principal Balance | 265,834 | 282,912
Related Allowance | 6,339 | 6,678
Average Recorded Investment | 259,759 | 274,097
Single-family residential | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 14,791 | 17,250
Unpaid Principal Balance | 16,304 | 19,644
Related Allowance | 0 | 0
Average Recorded Investment | 12,837 | 14,069
Single-family residential | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 246,210 | 259,461
Unpaid Principal Balance | 249,530 | 263,268
Related Allowance | 6,339 | 6,678
Average Recorded Investment | 246,922 | 260,028
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 5,441
Unpaid Principal Balance | 0 | 7,929
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 5,903
Construction | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 453
Unpaid Principal Balance | 0 | 2,151
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 471
Construction | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 | 4,988
Unpaid Principal Balance | 0 | 5,778
Related Allowance | 0 | 0
Average Recorded Investment | 0 | 5,432
Construction - custom |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,182 | 554
Unpaid Principal Balance | 1,182 | 554
Related Allowance | 0 | 0
Average Recorded Investment | 868 | 182
Construction - custom | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,182 | 554
Unpaid Principal Balance | 1,182 | 554
Related Allowance | 0 | 0
Average Recorded Investment | 868 | 182
Construction - custom | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 |
Unpaid Principal Balance | 0 |
Related Allowance | 0 |
Average Recorded Investment | 0 |
Land - acquisition & development |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,643 | 5,056
Unpaid Principal Balance | 11,933 | 12,852
Related Allowance | 0 | 0
Average Recorded Investment | 3,621 | 4,404
Land - acquisition & development | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 542 | 2,570
Unpaid Principal Balance | 8,630 | 9,426
Related Allowance | 0 | 0
Average Recorded Investment | 1,327 | 926
Land - acquisition & development | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,101 | 2,486
Unpaid Principal Balance | 3,303 | 3,426
Related Allowance | 0 | 0
Average Recorded Investment | 2,294 | 3,478
Land - consumer lot loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,590 | 12,016
Unpaid Principal Balance | 11,872 | 12,368
Related Allowance | 0 | 0
Average Recorded Investment | 11,547 | 11,868
Land - consumer lot loans | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 510 | 727
Unpaid Principal Balance | 527 | 814
Related Allowance | 0 | 0
Average Recorded Investment | 427 | 544
Land - consumer lot loans | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 11,080 | 11,289
Unpaid Principal Balance | 11,345 | 11,554
Related Allowance | 0 | 0
Average Recorded Investment | 11,120 | 11,324
Multi-family |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 3,191 | 7,593
Unpaid Principal Balance | 7,189 | 10,877
Related Allowance | 0 | 0
Average Recorded Investment | 3,554 | 5,277
Multi-family | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 761 | 3,770
Unpaid Principal Balance | 4,754 | 7,054
Related Allowance | 0 | 0
Average Recorded Investment | 1,117 | 1,545
Multi-family | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 2,430 | 3,823
Unpaid Principal Balance | 2,435 | 3,823
Related Allowance | 0 | 0
Average Recorded Investment | 2,437 | 3,732
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 31,133 | 28,551
Unpaid Principal Balance | 35,839 | 36,698
Related Allowance | 0 | 0
Average Recorded Investment | 28,728 | 27,016
Commercial real estate | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 7,331 | 9,427
Unpaid Principal Balance | 8,671 | 15,620
Related Allowance | 0 | 0
Average Recorded Investment | 4,686 | 8,130
Commercial real estate | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 23,802 | 19,124
Unpaid Principal Balance | 27,168 | 21,078
Related Allowance | 0 | 0
Average Recorded Investment | 24,042 | 18,886
Commercial & industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 953 | 2,955
Unpaid Principal Balance | 6,687 | 13,066
Related Allowance | 0 | 0
Average Recorded Investment | 948 | 2,681
Commercial & industrial | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 953 | 2,955
Unpaid Principal Balance | 6,687 | 13,066
Related Allowance | 0 | 0
Average Recorded Investment | 948 | 2,681
Commercial & industrial | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 0 |
Unpaid Principal Balance | 0 |
Related Allowance | 0 |
Average Recorded Investment | 0 |
HELOC |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,655 | 2,126
Unpaid Principal Balance | 2,024 | 2,975
Related Allowance | 0 | 0
Average Recorded Investment | 1,638 | 1,895
HELOC | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 262 | 683
Unpaid Principal Balance | 631 | 1,532
Related Allowance | 0 | 0
Average Recorded Investment | 245 | 536
HELOC | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 1,393 | 1,443
Unpaid Principal Balance | 1,393 | 1,443
Related Allowance | 0 | 0
Average Recorded Investment | 1,393 | 1,359
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 576 | 576
Unpaid Principal Balance | 765 | 992
Related Allowance | 0 | 0
Average Recorded Investment | 483 | 492
Consumer | Financing Receivable, Impairment, No Related Allowance |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 479 | 477
Unpaid Principal Balance | 479 | 703
Related Allowance | 0 | 0
Average Recorded Investment | 385 | 390
Consumer | Financing Receivable, Impairment, Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | 97 | 99
Unpaid Principal Balance | 286 | 289
Related Allowance | 0 | 0
Average Recorded Investment | $ 98 | $ 102

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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=49124121&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=49124121&loc=SL6953423-111524 + Details
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