Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,039,060	$ 982,461
Total Capital (to Risk-Weighted Assets), Actual, Ratio	18.01%	18.19%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 461,574	$ 432,081
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 973,169	$ 914,937
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	16.87%	16.94%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 346,180	$ 324,061
Common equity Tier I capital ratio, Actual, Amount	$ 948,210	$ 890,118
Common equity Tier I capital ratio, Actual, Ratio	16.43%	16.48%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 259,635	$ 243,046
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 973,169	$ 914,937
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.88%	11.49%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 327,680	$ 318,552
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,029,126	$ 971,681
Total Capital (to Risk-Weighted Assets), Actual, Ratio	17.86%	18.01%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 461,037	$ 431,576
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	576,296	539,471
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 963,235	$ 904,236
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	16.71%	16.76%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 345,778	$ 323,682
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	461,037	431,576
Common equity Tier I capital ratio, Actual, Amount	$ 963,235	$ 904,236
Common equity Tier I capital ratio, Actual, Ratio	16.71%	16.76%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 259,333	$ 242,762
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	374,592	350,656
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 963,235	$ 904,236
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.77%	11.36%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 327,397	$ 318,305
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 409,246	$ 397,882
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 required for capital adequacy.

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Common equity tier one capital ratio required to be well capitalized.

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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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Amount of Common Equity Tier One Risk-based Capital, as defined by regulatory framework.

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Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized under regulatory framework for prompt corrective action.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as well-capitalized under regulatory framework for prompt corrective action.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
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-Subparagraph (c)(1)
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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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