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Loans - Amount of Loans Receivable Held-for-Investment and Related Allowances Per Loan Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Allowance for loan losses:
Beginning Balance	$ 27,497	$ 26,160
Charge-offs	(92)	(64)
Recoveries	22	42
Provisions (credit)	59	34
Ending balance	27,486	26,172
Ending balance: individually evaluated for impairment	120		$ 26
Ending balance: collectively evaluated for impairment	27,366		27,471
Loans, net:
Loans held-for-investment, net	3,255,860		3,245,170
Ending balance: individually evaluated for impairment	21,501		22,329
Ending balance: collectively evaluated for impairment	3,234,359		3,222,841
Originated
Allowance for loan losses:
Beginning Balance	26,487	25,172
Charge-offs	(32)	(63)
Recoveries	13	36
Provisions (credit)	8	73
Ending balance	26,476	25,218
Ending balance: individually evaluated for impairment	120		26
Ending balance: collectively evaluated for impairment	26,356		26,461
Loans, net:
Loans held-for-investment, net	2,727,852		2,678,877
Ending balance: individually evaluated for impairment	17,832		18,547
Ending balance: collectively evaluated for impairment	2,710,020		2,660,330
Purchased Credit-Impaired
Allowance for loan losses:
Beginning Balance	1,010	951
Charge-offs	0	0
Recoveries	0	0
Provisions (credit)	0	0
Ending balance	1,010	951
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	1,010		1,010
Loans, net:
Loans held-for-investment, net	18,892		20,143
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	18,892		20,143
Acquired Loans
Allowance for loan losses:
Beginning Balance	0	37
Charge-offs	(60)	(1)
Recoveries	9	6
Provisions (credit)	51	(39)
Ending balance	0	3
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	0		0
Loans, net:
Loans held-for-investment, net	509,116		546,150
Ending balance: individually evaluated for impairment	3,669		3,782
Ending balance: collectively evaluated for impairment	505,447		542,368
Real Estate | Commercial | Originated
Allowance for loan losses:
Beginning Balance	5,630	5,196
Charge-offs	(6)	(3)
Recoveries	13	16
Provisions (credit)	(255)	4
Ending balance	5,382	5,213
Ending balance: individually evaluated for impairment	100		0
Ending balance: collectively evaluated for impairment	5,282		5,630
Loans, net:
Loans held-for-investment, net	502,849		499,860
Ending balance: individually evaluated for impairment	14,573		15,252
Ending balance: collectively evaluated for impairment	488,276		484,608
Real Estate | One-to-Four Family | Originated
Allowance for loan losses:
Beginning Balance	342	503
Charge-offs	0	0
Recoveries	0	0
Provisions (credit)	28	(48)
Ending balance	370	455
Ending balance: individually evaluated for impairment	10		18
Ending balance: collectively evaluated for impairment	360		324
Loans, net:
Loans held-for-investment, net	91,873		92,433
Ending balance: individually evaluated for impairment	1,873		1,893
Ending balance: collectively evaluated for impairment	90,000		90,540
Real Estate | Construction and Land | Originated
Allowance for loan losses:
Beginning Balance	463	610
Charge-offs	0	0
Recoveries	0	0
Provisions (credit)	111	(147)
Ending balance	574	463
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	574		463
Loans, net:
Loans held-for-investment, net	30,199		26,613
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	30,199		26,613
Real Estate | Multifamily | Originated
Allowance for loan losses:
Beginning Balance	18,084	17,374
Charge-offs	0	0
Recoveries	0	0
Provisions (credit)	262	38
Ending balance	18,346	17,412
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	18,346		18,084
Loans, net:
Loans held-for-investment, net	1,981,444		1,933,946
Ending balance: individually evaluated for impairment	1,261		1,268
Ending balance: collectively evaluated for impairment	1,980,183		1,932,678
Real Estate | Home equity and lines of credit | Originated
Allowance for loan losses:
Beginning Balance	291	122
Charge-offs	0	(60)
Recoveries	0	0
Provisions (credit)	45	163
Ending balance	336	225
Ending balance: individually evaluated for impairment	7		5
Ending balance: collectively evaluated for impairment	329		286
Loans, net:
Loans held-for-investment, net	81,136		80,315
Ending balance: individually evaluated for impairment	59		61
Ending balance: collectively evaluated for impairment	81,077		80,254
Commercial and Industrial | Originated
Allowance for loan losses:
Beginning Balance	1,569	1,273
Charge-offs	(26)	0
Recoveries	0	20
Provisions (credit)	(167)	44
Ending balance	1,376	1,337
Ending balance: individually evaluated for impairment	3		3
Ending balance: collectively evaluated for impairment	1,373		1,566
Loans, net:
Loans held-for-investment, net	39,016		44,190
Ending balance: individually evaluated for impairment	66		73
Ending balance: collectively evaluated for impairment	38,950		44,117
Other | Originated
Allowance for loan losses:
Beginning Balance	108	94
Charge-offs	0	0
Recoveries	0	0
Provisions (credit)	(16)	19
Ending balance	92	$ 113
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	92		108
Loans, net:
Loans held-for-investment, net	1,335		1,520
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	$ 1,335		$ 1,520

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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