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Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,007,847	$ 991,405	$ 1,052,795	$ 956,816
Unrealized gains (losses) arising during period, before tax	(510)	2,695	(8,359)	20,226
Income tax effect	132	(701)	2,351	(5,259)
Other comprehensive income (loss) before reclassifications	(378)	1,994	(6,008)	14,967
Reclassification adjustments for (gains) losses included in net income, before tax	(7,307)	(237)	(11,439)	(646)
Income tax effect	1,899	62	2,946	168
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(5,408)	(175)	(8,493)	(478)
Other comprehensive income (loss), net of income tax effect	(5,786)	1,819	(14,501)	14,489
Ending balance	1,051,491	1,019,150	1,051,491	1,019,150
Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	27,525	6,802	14,287	(21,741)
Unrealized gains (losses) arising during period, before tax	(1,090)	7,858	25,127	46,430
Income tax effect	283	(2,043)	(6,533)	(12,072)
Other comprehensive income (loss) before reclassifications	(807)	5,815	18,594	34,358
Reclassification adjustments for (gains) losses included in net income, before tax	(11,707)	(1,001)	(20,035)	(1,001)
Income tax effect	3,044	260	5,209	260
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(8,663)	(741)	(14,826)	(741)
Other comprehensive income (loss), net of income tax effect	(9,470)	5,074	3,768	33,617
Ending balance	18,055	11,876	18,055	11,876
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(37,490)	(16,795)	(15,537)	(922)
Unrealized gains (losses) arising during period, before tax	580	(5,163)	(33,486)	(26,204)
Income tax effect	(151)	1,342	8,884	6,813
Other comprehensive income (loss) before reclassifications	429	(3,821)	(24,602)	(19,391)
Reclassification adjustments for (gains) losses included in net income, before tax	4,400	764	8,596	355
Income tax effect	(1,145)	(198)	(2,263)	(92)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	3,255	566	6,333	263
Other comprehensive income (loss), net of income tax effect	3,684	(3,255)	(18,269)	(19,128)
Ending balance	(33,806)	(20,050)	(33,806)	(20,050)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(9,965)	(9,993)	(1,250)	(22,663)
Other comprehensive income (loss), net of income tax effect	(5,786)	1,819	(14,501)	14,489
Ending balance	$ (15,751)	$ (8,174)	$ (15,751)	$ (8,174)

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