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Loans Receivable and Allowance for Loan Losses - Schedule of Loan Purchases and Sales (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Payments to acquire loans receivable | $ 398,468,000 | $ 264,090,000 | $ 0
Proceeds from sale of loans receivable | $ (107,119,000) | $ (458,192,000) | (39,073,000)
Loans held-for-investment, purchase price as a percentage of loans outstanding | 99.90% | 99.40% |
Gain (loss) on sales of loans | $ 3,294,000 | $ 4,223,000 | 3,685,000
Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of loans receivable | (54,638,000) | (226,831,000) | 0
Commercial and industrial (including owner occupied commercial real estate) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of loans receivable | (32,263,000) | (19,974,000) | (23,731,000)
Commercial real estate owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of loans receivable | (20,218,000) | (19,813,000) | (15,342,000)
Residential real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Payments to acquire loans receivable | 368,402,000 | 264,090,000 | 0
Proceeds from sale of loans receivable | 0 | (191,574,000) | 0
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Payments to acquire loans receivable | 30,066,000 | 0 | 0
Proceeds from sale of loans receivable | $ 0 | $ 0 | $ 0

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- Definition Loans Held-for-investment, Purchase Price as a Percentage of Loans Outstanding + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition The cash outflow for the purchase of loan receivable arising from the financing of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the sale of loans receivables arising from the financing of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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