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Allowance for Losses on Loans - Allowance for Losses on Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | $ 106,829 |  |  |  | $ 114,591 | $ 106,829 | $ 114,591 |
Charge-offs |  |  |  |  |  |  |  |  | (6,000) | (14,600) |
Recoveries |  |  |  |  |  |  |  |  | 19,065 | 19,970 |
Provision & Transfers |  |  |  |  |  |  |  |  | (6,400) | (13,132) |
Ending Allowance | $ 113,494 |  |  |  | $ 106,829 |  |  |  | 113,494 | 106,829 | $ 114,591
Provision (release) for loan losses | (3,100) | $ (1,650) | $ (1,500) | 0 | 219 | $ (1,932) | $ (3,949) | (5,500) | (6,250) | (11,162) | (15,401)
Single-family residential |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 47,347 |  |  |  | 62,763 | 47,347 | 62,763 |
Charge-offs |  |  |  |  |  |  |  |  | (3,106) | (5,524) |
Recoveries |  |  |  |  |  |  |  |  | 3,251 | 13,403 |
Provision & Transfers |  |  |  |  |  |  |  |  | (9,696) | (23,295) |
Ending Allowance | 37,796 |  |  |  | 47,347 |  |  |  | 37,796 | 47,347 | 62,763
Construction |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 6,680 |  |  |  | 6,742 | 6,680 | 6,742 |
Charge-offs |  |  |  |  |  |  |  |  | 0 | (388) |
Recoveries |  |  |  |  |  |  |  |  | 745 | 120 |
Provision & Transfers |  |  |  |  |  |  |  |  | 12,413 | 206 |
Ending Allowance | 19,838 |  |  |  | 6,680 |  |  |  | 19,838 | 6,680 | 6,742
Construction - custom |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 990 |  |  |  | 1,695 | 990 | 1,695 |
Charge-offs |  |  |  |  |  |  |  |  | (60) | 0 |
Recoveries |  |  |  |  |  |  |  |  | 60 | 0 |
Provision & Transfers |  |  |  |  |  |  |  |  | 90 | (705) |
Ending Allowance | 1,080 |  |  |  | 990 |  |  |  | 1,080 | 990 | 1,695
Land - acquisition & development |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 5,781 |  |  |  | 5,592 | 5,781 | 5,592 |
Charge-offs |  |  |  |  |  |  |  |  | (42) | (38) |
Recoveries |  |  |  |  |  |  |  |  | 8,220 | 207 |
Provision & Transfers |  |  |  |  |  |  |  |  | (7,936) | 20 |
Ending Allowance | 6,023 |  |  |  | 5,781 |  |  |  | 6,023 | 5,781 | 5,592
Land - consumer lot loans |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 2,946 |  |  |  | 3,077 | 2,946 | 3,077 |
Charge-offs |  |  |  |  |  |  |  |  | (732) | (459) |
Recoveries |  |  |  |  |  |  |  |  | 5 | 221 |
Provision & Transfers |  |  |  |  |  |  |  |  | 316 | 107 |
Ending Allowance | 2,535 |  |  |  | 2,946 |  |  |  | 2,535 | 2,946 | 3,077
Multi-family |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 5,304 |  |  |  | 4,248 | 5,304 | 4,248 |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 |
Recoveries |  |  |  |  |  |  |  |  | 0 | 220 |
Provision & Transfers |  |  |  |  |  |  |  |  | 1,621 | 836 |
Ending Allowance | 6,925 |  |  |  | 5,304 |  |  |  | 6,925 | 5,304 | 4,248
Commercial real estate |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 8,960 |  |  |  | 7,548 | 8,960 | 7,548 |
Charge-offs |  |  |  |  |  |  |  |  | (103) | (1,711) |
Recoveries |  |  |  |  |  |  |  |  | 1,812 | 735 |
Provision & Transfers |  |  |  |  |  |  |  |  | (2,081) | 2,388 |
Ending Allowance | 8,588 |  |  |  | 8,960 |  |  |  | 8,588 | 8,960 | 7,548
Commercial & industrial |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 24,980 |  |  |  | 16,527 | 24,980 | 16,527 |
Charge-offs |  |  |  |  |  |  |  |  | (941) | (3,354) |
Recoveries |  |  |  |  |  |  |  |  | 2,933 | 1,374 |
Provision & Transfers |  |  |  |  |  |  |  |  | 1,036 | 10,433 |
Ending Allowance | 28,008 |  |  |  | 24,980 |  |  |  | 28,008 | 24,980 | 16,527
HELOC |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 902 |  |  |  | 928 | 902 | 928 |
Charge-offs |  |  |  |  |  |  |  |  | (54) | (66) |
Recoveries |  |  |  |  |  |  |  |  | 21 | 2 |
Provision & Transfers |  |  |  |  |  |  |  |  | (56) | 38 |
Ending Allowance | 813 |  |  |  | 902 |  |  |  | 813 | 902 | 928
Consumer |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | 2,939 |  |  |  | 3,227 | 2,939 | 3,227 |
Charge-offs |  |  |  |  |  |  |  |  | (962) | (3,060) |
Recoveries |  |  |  |  |  |  |  |  | 2,018 | 3,688 |
Provision & Transfers |  |  |  |  |  |  |  |  | (2,107) | (916) |
Ending Allowance | $ 1,888 |  |  |  | 2,939 |  |  |  | 1,888 | 2,939 | 3,227
Covered Loans |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning Allowance |  |  |  | $ 0 |  |  |  | $ 2,244 | $ 0 | 2,244 |
Charge-offs |  |  |  |  |  |  |  |  |  | 0 |
Recoveries |  |  |  |  |  |  |  |  |  | 0 |
Provision & Transfers |  |  |  |  |  |  |  |  |  | (2,244) |
Ending Allowance |  |  |  |  | $ 0 |  |  |  |  | $ 0 | $ 2,244

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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