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Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, mortgage warehouse, at fair value				$ 2,245,758
Loans receivable, PPP	$ 4,760,427			0
Loans and leases receivable	7,272,447			7,318,988
Allowance for credit losses on loans and leases	(159,905)	$ (149,283)	$ (136,200)	(56,379)	$ (48,388)	$ (43,679)	$ (39,972)
Total loans and leases receivable, net of allowance for credit losses	14,666,133			9,508,367
Deferred (fees) costs and unamortized (discounts) premiums, net	(83,100)			2,100
Loans and leases receivable, mortgage warehouse, at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, mortgage warehouse, at fair value	2,793,164			2,245,758
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,581,839			1,909,274
Allowance for credit losses on loans and leases	(14,697)	(8,750)		(6,157)	(9,926)	(10,630)	(11,462)
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	128,834			118,418
Allowance for credit losses on loans and leases	(5,297)	(1,934)		(1,262)	(649)	(584)	(624)
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	348,109			375,014
Allowance for credit losses on loans and leases	(4,550)	(4,180)		(3,218)	(4,168)	(6,572)	(3,654)
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	66,865			70,398
Allowance for credit losses on loans and leases	(6,014)	(4,987)		(1,060)	(123)	(117)	(145)
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,257,813			1,178,283
Allowance for credit losses on loans and leases	(79,147)	$ (83,569)		(20,648)	$ (10,267)	$ (3,689)	$ (2,529)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,599,660			5,690,820
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,581,839			1,907,331
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,099,442			1,891,152
Commercial | Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	544,772			551,948
Commercial | Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,244,773			1,222,772
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	128,834			117,617
Commercial | Direct Finance Equipment Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	96,400			89,200
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,672,787			1,628,168
Consumer | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	348,109			382,634
Consumer | Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	66,865			71,359
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 1,257,813			$ 1,174,175

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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