Regulatory Matters - Schedule of Company's and Bank's Capital Compliance (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1 capital ratio	$ 93,287
Tier 1 leverage ratio	93,287
Tier 1 risk-based capital ratio	93,287
Total risk based capital ratio	$ 99,812
Common equity tier 1 capital ratio	16.10%
Tier 1 leverage ratio	10.85%
Tier 1 risk-based capital ratio	16.10%
Total risk based capital ratio	17.23%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1 capital ratio	$ 91,528
Tier 1 leverage ratio	91,528
Tier 1 risk-based capital ratio	91,528
Total risk based capital ratio	$ 98,052
Common equity tier 1 capital ratio	15.88%
Tier 1 leverage ratio	10.64%
Tier 1 risk-based capital ratio	15.88%
Total risk based capital ratio	17.01%