Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 914,972	$ 853,147
Total Capital (to Risk-Weighted Assets), Actual, Ratio	18.23%	18.24%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 401,532	$ 374,144
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 852,189	$ 794,576
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	16.98%	16.99%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 301,149	$ 187,072
Common equity Tier I capital ratio, Actual, Amount	$ 827,547
Common equity Tier I capital ratio, Actual, Ratio	16.49%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 225,861
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 852,189	$ 794,576
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.22%	10.86%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 303,794	$ 292,615
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 905,563	$ 845,951
Total Capital (to Risk-Weighted Assets), Actual, Ratio	18.06%	18.11%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 401,053	$ 373,758
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	501,316	467,197
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 842,854	$ 787,439
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	16.81%	16.85%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 300,790	$ 186,879
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	401,053	280,318
Common equity Tier I capital ratio, Actual, Amount	$ 842,854
Common equity Tier I capital ratio, Actual, Ratio	16.81%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 225,592
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	325,856
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 842,854	$ 787,439
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.11%	10.77%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 303,527	$ 292,392
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 379,409	$ 365,490
Minimum [Member] \| Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	6.00%	4.00%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio	4.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Minimum [Member] \| Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	10.00%	10.00%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	6.00%	4.00%
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	8.00%	8.00%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio	4.50%
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Ratio	6.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Ratio	5.00%	5.00%

Common equity tier one capital ratio.

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Common equity tier one capital ratio required for capital adequacy.

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Common equity tier one capital ratio required for capital adequacy amount.

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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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