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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Comprehensive Income [Line Items]
Net Income	$ 18,543	$ 20,537	$ 16,642	$ 10,816	$ 13,133	$ 13,065	$ 14,115	$ 12,804	$ 66,538	$ 53,117	$ 33,117
Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, net of taxes									(2,117)	(25)	913
Other Comprehensive Income (Loss), Net of Tax									14,576	(3,827)	2,093
Comprehensive Income									81,114	49,290	35,210
Parent Company [Member]
Condensed Comprehensive Income [Line Items]
Net Income									66,538	53,117	33,117
Other Comprehensive Income (Loss)
Change in fair value of derivative instruments, net of taxes									(2,117)	(25)	913
Unrealized appreciation for the period on held to maturity securities, net of taxes									(92)	(150)	(166)
Unrealized appreciation (depreciation) on available for sale securities, net of taxes									16,727	(4,003)	1,371
Less: reclassification adjustment for realized (gains) losses included in net income, net of taxes									59	351	(25)
Other Comprehensive Income (Loss), Net of Tax									14,576	(3,827)	2,093
Comprehensive Income									$ 81,114	$ 49,290	$ 35,210

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