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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 13,133 | $ 13,065 | $ 14,115 | $ 12,804 | $ 7,650 | $ 8,171 | $ 9,072 | $ 8,224 | $ 53,117 | $ 33,117 | $ 23,912
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivative instruments, net of taxes |  |  |  |  |  |  |  |  | (25) | 913 | 6
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (3,827) | 2,093 | (4,921)
Comprehensive Income |  |  |  |  |  |  |  |  | 49,290 | 35,210 | 18,991
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 53,117 | 33,117 | 23,912
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivative instruments, net of taxes |  |  |  |  |  |  |  |  | (25) | 913 | 6
Unrealized appreciation for the period on held to maturity securities, net of taxes |  |  |  |  |  |  |  |  | (150) | (166) | (424)
Unrealized appreciation (depreciation) on available for sale securities, net of taxes |  |  |  |  |  |  |  |  | (4,003) | 1,371 | (3,310)
Less: reclassification adjustment for realized (gains) losses included in net income, net of taxes |  |  |  |  |  |  |  |  | 351 | (25) | (1,193)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  | (3,827) | 2,093 | (4,921)
Comprehensive Income |  |  |  |  |  |  |  |  | $ 49,290 | $ 35,210 | $ 18,991

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e557-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 + Details
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