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Regulatory Matters - Actual Amount and Capital Ratios of Company and Bank (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 776,101	$ 774,809
Total Capital (to Risk-Weighted Assets), Actual, Ratio	19.49%	19.05%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	318,564	325,379
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	725,702	723,329
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	18.23%	17.79%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	159,232	162,637
Tier 1 Capital (to Average-Assets), Actual, Amount	725,702	723,329
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.50%	11.19%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	252,418	258,563
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual, Amount	756,954	756,702
Total Capital (to Risk-Weighted Assets), Actual, Ratio	19.03%	18.63%
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	318,215	324,939
Total Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	397,769	406,174
Tier 1 Capital (to Risk-Weighted Assets), Actual, Amount	706,611	705,273
Tier 1 Capital (to Risk-Weighted Assets), Actual, Ratio	17.77%	17.36%
Tier 1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount	159,057	162,505
Tier 1 Capital (to Risk-Weighted Assets), Required To Be Well Capitalized, Amount	238,586	243,758
Tier 1 Capital (to Average-Assets), Actual, Amount	706,611	705,273
Tier 1 Capital (to Average-Assets), Actual, Ratio	11.21%	10.92%
Tier 1 Capital (to Average-Assets), For Capital Adequacy Purposes, Amount	252,136	258,342
Tier 1 Capital (to Average-Assets), Required To Be Well Capitalized, Amount	$ 315,170	$ 322,927
Minimum [Member] | 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	4.00%	4.00%
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	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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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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

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-Name Audit and Accounting Guide (AAG)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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