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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.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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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