Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 982,461	$ 914,972
Total Capital (to Risk-Weighted Assets), Actual, Ratio	18.19%	18.23%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 432,081	$ 401,532
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 914,937	$ 852,189
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	16.94%	16.98%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 324,061	$ 301,149
Common equity Tier I capital ratio, Actual, Amount	$ 890,118	$ 827,547
Common equity Tier I capital ratio, Actual, Ratio	16.48%	16.49%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 243,046	$ 225,861
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 914,937	$ 852,189
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.49%	11.22%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 318,552	$ 303,794
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 971,681	$ 905,563
Total Capital (to Risk-Weighted Assets), Actual, Ratio	18.01%	18.06%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 431,576	$ 401,053
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	539,471	501,316
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 904,236	$ 842,854
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	16.76%	16.81%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 323,682	$ 300,790
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	431,576	401,053
Common equity Tier I capital ratio, Actual, Amount	$ 904,236	$ 842,854
Common equity Tier I capital ratio, Actual, Ratio	16.76%	16.81%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 242,762	$ 225,592
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	350,656	325,856
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 904,236	$ 842,854
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.36%	11.11%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 318,305	$ 303,527
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 397,882	$ 379,409
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%	6.00%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Ratio	4.50%	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%	6.00%
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%	4.50%
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Ratio	6.50%	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 to be well capitalized amount.

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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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