Business Combination - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Apr. 01, 2017	Jun. 30, 2017	Dec. 31, 2016	[1]
Identifiable liabilities assumed:
Goodwill resulting from acquisition		$ 8,966	$ 2,808
As Recorded by the Company
Consideration paid:
Bay Banks of Virginia, Inc. common stock	$ 42,247
Identifiable assets acquired:
Cash and due from banks	2,356
Interest-bearing deposits	12,342
Securities available-for-sale	22,088
Restricted securities	1,543
Loans receivable	212,572
Loans held for sale	55,648
Deferred income taxes	825
Premises and equipment	6,036
Accrued interest receivable	1,229
Other real estate owned	3,113
Core deposit intangible	3,670
Bank owned life insurance	8,430
Mortgage servicing rights	324
Other assets	367
Total identified assets acquired	330,543
Identifiable liabilities assumed:
Noninterest-bearing deposits	21,119
Savings and interest-bearing demand deposits	124,640
Time deposits	122,170
Federal Home Loan Bank advances	25,000
Other liabilities	1,525
Total identifiable liabilities assumed	294,454
Total identifiable assets assumed	36,089
Goodwill resulting from acquisition	6,158
Fair Value Adjustment
Identifiable assets acquired:
Loans receivable	(4,259)
Deferred income taxes	(500)
Premises and equipment	2,703
Accrued interest receivable	(24)
Core deposit intangible	3,670
Total identified assets acquired	1,590
Identifiable liabilities assumed:
Time deposits	733
Total identifiable liabilities assumed	733
Total identifiable assets assumed	857
Virginia Commonwealth Bank
Identifiable assets acquired:
Cash and due from banks	2,356
Interest-bearing deposits	12,342
Securities available-for-sale	22,088
Restricted securities	1,543
Loans receivable	216,831
Loans held for sale	55,648
Deferred income taxes	1,325
Premises and equipment	3,333
Accrued interest receivable	1,253
Other real estate owned	3,113
Bank owned life insurance	8,430
Mortgage servicing rights	324
Other assets	367
Total identified assets acquired	328,953
Identifiable liabilities assumed:
Noninterest-bearing deposits	21,119
Savings and interest-bearing demand deposits	124,640
Time deposits	121,437
Federal Home Loan Bank advances	25,000
Other liabilities	1,525
Total identifiable liabilities assumed	293,721
Total identifiable assets assumed	$ 35,232

[1] Derived from the audited December 31, 2016 Consolidated Financial Statements