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Regulatory Matters - Regulatory Capital Amounts and Ratios for Company and Bank (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 801,719	$ 776,101
Total Capital (to Risk-Weighted Assets), Actual, Ratio	19.09%	19.49%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	336,008	318,564
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	748,825	725,702
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	17.83%	18.23%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	168,004	159,232
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount
Tier 1 Capital (to Average-Assets), Actual, Amount	748,825	725,702
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.30%	11.50%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	265,035	252,418
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount
Company [Member] | Minimum [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
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio
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
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	794,239	756,954
Total Capital (to Risk-Weighted Assets), Actual, Ratio	18.93%	19.03%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	335,740	318,215
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	419,675	397,769
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	741,386	706,611
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	17.67%	17.77%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	167,870	159,057
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	251,805	238,586
Tier 1 Capital (to Average-Assets), Actual, Amount	741,386	706,611
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.20%	11.21%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	264,893	252,136
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 331,117	$ 315,170
Bank [Member] | Minimum [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	4.00%	4.00%
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Ratio	6.00%	6.00%
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%

X

- Definition

The amount of total capital as defined in the regulations.

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

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Tier 1 Risk Based Capital as defined in the regulations.

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