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Other Comprehensive Income (Loss) - Schedule of Components of OCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrealized losses on available for sale debt securities:
Net gains (losses) arising during the period	$ 20,134	$ 24,987	$ (8,425)
Reclassification adjustment for gains included in net income	0	0	0
Total	20,134	24,987	(8,425)
Unrealized (losses) gains on derivatives (cash flow hedges)	(7,099)	(780)
Unrealized (losses) gains on derivatives (cash flow hedges)			304
Amortization related to post-retirement obligations	5,604	(2,176)	1,678
Total other comprehensive income (loss)	18,639	22,031	(6,443)
Unrealized losses on available for sale debt securities:
Net gains (losses) arising during the period	(5,190)	(6,636)	2,296
Reclassification adjustment for gains included in net income	0	0	0
Total	(5,190)	(6,636)	2,296
Unrealized (losses) gains on derivatives (cash flow hedges)	1,830	201
Unrealized (losses) gains on derivatives (cash flow hedges)			(83)
Amortization related to post-retirement obligations	(1,445)	561	(457)
Total other comprehensive income (loss)	(4,805)	(5,874)	1,756
Unrealized losses on available for sale debt securities:
Net gains (losses) arising during the period	14,944	18,351	(6,129)
Reclassification adjustment for gains included in net income	0	0	0
Total	14,944	18,351	(6,129)
Unrealized (losses) gains on derivatives (cash flow hedges)	(5,269)	(579)
Unrealized (losses) gains on derivatives (cash flow hedges)			221
Amortization related to post-retirement obligations	4,159	(1,615)	1,221
Total other comprehensive income (loss)	$ 13,834	$ 16,157	$ (4,687)

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