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Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 10,368	$ 29,127
Securities available for sale:
Unrealized net holding gains arising during the period, gross	21,339	11,036
Tax effect	(5,335)	(2,759)
Unrealized net holding gains arising during the period, net	16,004	8,277
Reclassification adjustment for net (gains) losses in net income, gross	(3)	99
Tax effect	1	(25)
Reclassification adjustment for net (gains) losses in net income, net	(2)	74
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross	173	167
Tax effect	(43)	(42)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net	130	125
Total securities available for sale, net	16,132	8,476
Cash flow hedges:
Unrealized (losses) on derivatives (cash flow hedges), gross	(255)	(170)
Tax effect	64	43
Unrealized (losses) on derivatives (cash flow hedges), net	(191)	(127)
Reclassification of net unrealized losses (gains) on cash flow hedges to interest (income), gross	10	(799)
Tax effect	(3)	200
Reclassification of net unrealized losses (gains) on cash flow hedges to interest (income), net	7	(599)
Total cash flow hedges, net	(184)	(726)
Pension and other benefits:
Amortization of prior service cost and actuarial losses, gross	381	656
Tax effect	(95)	(164)
Amortization of prior service cost and actuarial losses, net	286	492
Total pension and other benefits, net	286	492
Total other comprehensive income	16,234	8,242
Comprehensive income	$ 26,602	$ 37,369

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