Condensed Comprehensive Income [Line Items]

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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
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- Definition

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

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- Definition

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

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- References

No definition available.

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- Definition

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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- Definition

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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- Definition

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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Comprehensive Income [Line Items]
Net income	$ 5,603	$ 6,602	$ 6,326	$ 5,381	$ 6,175	$ 4,288	$ 4,728	$ 5,358	$ 23,912	$ 20,549	$ 18,101
Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, net of taxes									6	127	(332)
Other Comprehensive Income (Loss), Net of Tax									(4,921)	(2,244)	3,250
Comprehensive Income									18,991	18,305	21,351
Parent Company [Member]
Condensed Comprehensive Income [Line Items]
Net income									23,912	20,549	18,101
Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, net of taxes									6	127	(332)
Unrealized appreciation for the period on held-to-maturity securities, net of taxes									(424)	(357)	1,078
Unrealized appreciation (depreciation) on available-for-sale securities, net of taxes									(3,310)	(1,891)	3,146
Less: reclassification adjustment for realized gains included in net income, net of taxes									(1,193)	(123)	(642)
Other Comprehensive Income (Loss), Net of Tax									(4,921)	(2,244)	3,250
Comprehensive Income									$ 18,991	$ 18,305	$ 21,351