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Regulatory Matters - Schedule of Actual Capital Amounts and Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Parent [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 492,668us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentMember		 $ 433,538us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Tier1 Capital (to Risk-Weighted Assets), Actual Amount 454,698us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentMember		 398,538us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Tier1 Capital (to Average Assets), Actual Amount 454,698us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentMember		 398,538us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Total Capital (to Risk-Weighted Assets), Actual Ratio 14.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember		 14.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Tier1 Capital (to Risk-Weighted Assets), Actual Ratio 13.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember		 13.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Tier1 Capital (to Average Assets), Actual Ratio 8.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember		 8.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
Parent [Member] | Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount 272,318us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 246,788us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount 136,159us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 123,394us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Average Assets), For Capital Adequacy Purposes, Amount 165,598us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 148,690us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital (to Risk-Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 340,397us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 308,484us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Risk-Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 204,238us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 185,091us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 275,996us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 247,816us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Average Assets), For Capital Adequacy Purposes, Ratio 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital (to Risk-Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Risk-Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ParentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Consolidated [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), Actual Amount 587,094us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember		 525,460us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier1 Capital (to Risk-Weighted Assets), Actual Amount 549,124us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember		 490,460us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier1 Capital (to Average Assets), Actual Amount 549,124us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember		 490,460us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Total Capital (to Risk-Weighted Assets), Actual Ratio 17.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember		 17.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier1 Capital (to Risk-Weighted Assets), Actual Ratio 16.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember		 16.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Tier1 Capital (to Average Assets), Actual Ratio 10.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember		 10.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
Consolidated [Member] | Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount 273,764us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 247,985us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Amount 136,882us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 123,993us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Average Assets), For Capital Adequacy Purposes, Amount $ 166,489us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 149,488us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier1 Capital (to Average Assets), For Capital Adequacy Purposes, Ratio 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember