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Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,117,086	$ 1,052,795
Unrealized gains (losses) arising during period, before tax	12,715	(36,795)
Income tax effect	(3,306)	9,717
Other comprehensive income (loss) before reclassifications	9,409	(27,078)
Reclassification adjustments for (gains) losses included in net income, before tax	2,360	(2,496)
Income tax effect	(614)	649
Amounts reclassified from accumulated other comprehensive income (loss) to net income	1,746	(1,847)
Other comprehensive income (loss), net of income tax effect	11,155	(28,925)
Ending balance	1,188,721	964,636
Unrealized Gains (Losses) on Available for Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	23,312	14,287
Unrealized gains (losses) arising during period, before tax	400	(9,098)
Income tax effect	(104)	2,366
Other comprehensive income (loss) before reclassifications	296	(6,732)
Reclassification adjustments for (gains) losses included in net income, before tax	(23,566)	(3,974)
Income tax effect	6,127	1,033
Amounts reclassified from accumulated other comprehensive income (loss) to net income	(17,439)	(2,941)
Other comprehensive income (loss), net of income tax effect	(17,143)	(9,673)
Ending balance	6,169	4,614
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(29,076)	(15,537)
Unrealized gains (losses) arising during period, before tax	12,315	(27,697)
Income tax effect	(3,202)	7,351
Other comprehensive income (loss) before reclassifications	9,113	(20,346)
Reclassification adjustments for (gains) losses included in net income, before tax	25,926	1,478
Income tax effect	(6,741)	(384)
Amounts reclassified from accumulated other comprehensive income (loss) to net income	19,185	1,094
Other comprehensive income (loss), net of income tax effect	28,298	(19,252)
Ending balance	(778)	(34,789)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(5,764)	(1,250)
Other comprehensive income (loss), net of income tax effect	11,155	(28,925)
Ending balance	$ 5,391	$ (30,175)

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