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Condensed Financial Information (Parent Company Only) - Condensed Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 7,650 | $ 8,171 | $ 9,072 | $ 8,224 | $ 5,603 | $ 6,602 | $ 6,326 | $ 5,381 | $ 33,117 | $ 23,912 | $ 20,549
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivative instruments, net of taxes |  |  |  |  |  |  |  |  | 913 | 6 | 127
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | 2,093 | (4,921) | (2,244)
Comprehensive Income |  |  |  |  |  |  |  |  | 35,210 | 18,991 | 18,305
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 33,117 | 23,912 | 20,549
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivative instruments, net of taxes |  |  |  |  |  |  |  |  | 913 | 6 | 127
Unrealized appreciation for the period on held-to-maturity securities, net of taxes |  |  |  |  |  |  |  |  | (166) | (424) | (357)
Unrealized appreciation (depreciation) on available-for-sale securities, net of taxes |  |  |  |  |  |  |  |  | 1,371 | (3,310) | (1,891)
Less: reclassification adjustment for realized gains included in net income, net of taxes |  |  |  |  |  |  |  |  | (25) | (1,193) | (123)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | 2,093 | (4,921) | (2,244)
Comprehensive Income |  |  |  |  |  |  |  |  | $ 35,210 | $ 18,991 | $ 18,305

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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