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Merger - Business Acquisition Pro Forma Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net interest income after provision for loan losses | $ 10,515 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | $ 9,415 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income | 4,402 us-gaap_NoninterestIncome | 4,624 us-gaap_NoninterestIncome
Net income | 3,171 us-gaap_NetIncomeLoss | 2,712 us-gaap_NetIncomeLoss
Basic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic
Diluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted
Pro Forma [Member] |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net interest income after provision for loan losses | 11,508 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember | 10,462 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember
Noninterest income | 4,834 us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember | 4,713 us-gaap_NoninterestIncome / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember
Net income | $ 2,598 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember | $ 2,910 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember
Basic | $ 0.28 us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember | $ 0.29 us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember
Diluted | $ 0.24 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember | $ 0.24 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ProFormaMember

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.12) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 12 -Article 9 + Details
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