Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,263,800	$ 1,039,060
Total Capital (to Risk-Weighted Assets), Actual, Ratio	14.13%	18.01%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 715,283	$ 461,574
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,191,228	$ 973,169
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	13.32%	16.87%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 536,462	$ 346,180
Common equity Tier I capital ratio, Actual, Amount	$ 1,166,228	$ 948,210
Common equity Tier I capital ratio, Actual, Ratio	13.04%	16.43%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 402,347	$ 259,635
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,191,228	$ 973,169
Tier 1 Capital (to Average-Assets), Actual, Ratio	10.98%	11.88%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 433,834	$ 327,680
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,253,219	$ 1,029,126
Total Capital (to Risk-Weighted Assets), Actual, Ratio	14.03%	17.86%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 714,601	$ 461,037
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	893,251	576,296
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	$ 1,180,647	$ 963,235
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	13.22%	16.71%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	$ 535,951	$ 345,778
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	714,601	461,037
Common equity Tier I capital ratio, Actual, Amount	$ 1,180,647	$ 963,235
Common equity Tier I capital ratio, Actual, Ratio	13.22%	16.71%
Common equity Tier I capital ratio, For Capital Adequacy Purposes, Amount	$ 401,963	$ 259,333
Common equity Tier I capital ratio, To Be Well Capitalized under Prompt Corrective Action Provisions, Amount	580,613	374,592
Tier 1 Capital (to Average-Assets), Actual, Amount	$ 1,180,647	$ 963,235
Tier 1 Capital (to Average-Assets), Actual, Ratio	10.90%	11.77%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	$ 433,403	$ 327,397
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 541,754	$ 409,246
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 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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