Loans and Allowance for Loan and Lease Losses - Summary of Loans by Portfolio Type and Internal Credit Quality Ratings (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 884,427	$ 861,718
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	342,579	347,300
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	38,634	28,663
Commercial real estate | Owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	216,845	195,554
Commercial real estate | All other
Financing Receivable, Recorded Investment [Line Items]
Total loans	141,883	146,641
Residential mortgage loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	92,101	81,487
Residential mortgage loans | Single family
Financing Receivable, Recorded Investment [Line Items]
Total loans	39,823	52,072
Land development loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,562	10,001
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans	837,656	816,295
Pass | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	318,015	329,192
Pass | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	38,331	28,663
Pass | Commercial real estate | Owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	210,907	189,944
Pass | Commercial real estate | All other
Financing Receivable, Recorded Investment [Line Items]
Total loans	127,491	127,702
Pass | Residential mortgage loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	91,667	81,040
Pass | Residential mortgage loans | Single family
Financing Receivable, Recorded Investment [Line Items]
Total loans	39,823	51,371
Pass | Land development loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,422	8,383
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,920	15,255
Special Mention | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,656	5,626
Special Mention | Commercial real estate | Owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	649	177
Special Mention | Commercial real estate | All other
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,615	9,452
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans	26,291	30,168
Substandard | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,348	12,482
Substandard | Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	303	0
Substandard | Commercial real estate | Owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,289	5,433
Substandard | Commercial real estate | All other
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,777	9,487
Substandard | Residential mortgage loans | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Total loans	434	447
Substandard | Residential mortgage loans | Single family
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	701
Substandard | Land development loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,140	1,618
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,560	0
Doubtful | Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,560	$ 0