Loans - Allowance for Loan Losses and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	$ 17,868	$ 16,348
Recorded investment in loans	1,714,361	1,649,754
One- to four-family first mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	2,715	2,136
Recorded investment in loans	430,820	450,363
Home equity loans and lines
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,084	1,079
Recorded investment in loans	79,812	83,976
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	6,541	6,125
Recorded investment in loans	722,807	640,575
Construction and land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	2,670	2,285
Recorded investment in loans	195,748	193,597
Multi-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	572	550
Recorded investment in loans	54,869	54,455
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	3,694	3,228
Recorded investment in loans	184,701	172,934
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	592	945
Recorded investment in loans	45,604	53,854
Originated loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	14,744	13,706
Individually evaluated for impairment, Allowance for loan losses	1,347	1,154
Collectively evaluated for impairment, Recorded investment in loans	1,242,489	1,085,283
Individually evaluated for impairment, Recorded investment in loans	8,712	9,877
Recorded investment in loans	1,251,201	1,095,160
Originated loans \| One- to four-family first mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	2,046	1,937
Individually evaluated for impairment, Allowance for loan losses	0	0
Collectively evaluated for impairment, Recorded investment in loans	251,159	227,602
Individually evaluated for impairment, Recorded investment in loans	187	0
Recorded investment in loans	251,346	227,602
Originated loans \| Home equity loans and lines
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	706	682
Individually evaluated for impairment, Allowance for loan losses	348	349
Collectively evaluated for impairment, Recorded investment in loans	56,180	53,049
Individually evaluated for impairment, Recorded investment in loans	784	866
Recorded investment in loans	56,964	53,915
Originated loans \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	5,883	5,272
Individually evaluated for impairment, Allowance for loan losses	298	484
Collectively evaluated for impairment, Recorded investment in loans	522,621	432,217
Individually evaluated for impairment, Recorded investment in loans	6,518	7,059
Recorded investment in loans	529,139	439,276
Originated loans \| Construction and land
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	2,420	2,280
Individually evaluated for impairment, Allowance for loan losses	0	0
Collectively evaluated for impairment, Recorded investment in loans	173,687	161,232
Individually evaluated for impairment, Recorded investment in loans	0	0
Recorded investment in loans	173,687	161,232
Originated loans \| Multi-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	572	522
Individually evaluated for impairment, Allowance for loan losses	0	0
Collectively evaluated for impairment, Recorded investment in loans	48,661	42,222
Individually evaluated for impairment, Recorded investment in loans	0	0
Recorded investment in loans	48,661	42,222
Originated loans \| Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	2,671	2,541
Individually evaluated for impairment, Allowance for loan losses	701	321
Collectively evaluated for impairment, Recorded investment in loans	154,501	131,250
Individually evaluated for impairment, Recorded investment in loans	1,223	1,952
Recorded investment in loans	155,724	133,202
Originated loans \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Allowance for loan losses	446	472
Individually evaluated for impairment, Allowance for loan losses	0	0
Collectively evaluated for impairment, Recorded investment in loans	35,680	37,711
Individually evaluated for impairment, Recorded investment in loans	0	0
Recorded investment in loans	35,680	37,711
Acquired loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,777	1,488
Recorded investment in loans	463,160	554,594
Acquired loans \| One- to four-family first mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	669	199
Recorded investment in loans	179,474	222,761
Acquired loans \| Home equity loans and lines
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	30	48
Recorded investment in loans	22,848	30,061
Acquired loans \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	360	369
Recorded investment in loans	193,668	201,299
Acquired loans \| Construction and land
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	250	5
Recorded investment in loans	22,061	32,365
Acquired loans \| Multi-family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	0	28
Recorded investment in loans	6,208	12,233
Acquired loans \| Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	322	366
Recorded investment in loans	28,977	39,732
Acquired loans \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	146	473
Recorded investment in loans	$ 9,924	$ 16,143

Loans and leases receivable net of deferred income covered and noncovered.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

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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