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Loans Receivable and Allowance for Loan Losses - Schedule of Loan Purchases and Sales (Details) - USD ($)	12 Months Ended
	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

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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)
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-Topic 944
-SubTopic 220
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-Subparagraph (SX 210.7-04.3(a))
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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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-Publisher FASB
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