CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 6,030	$ 11,635
Unrealized gains and losses:
Unrealized holding gains on available-for-sale securities arising during the period	6,252	5,558
Tax effect	(1,691)	(1,422)
Net of tax	4,561	4,136
Reclassification adjustment for realized gains included in net income	(29)	(8)
Tax effect	6	2
Net of tax	(23)	(6)
Unrealized losses on cash flow hedge	(2,749)	(166)
Tax effect	773	27
Net of tax	(1,976)	(139)
Reclassification adjustment for realized gains included in net income	(7)	(182)
Tax effect	2	40
Net of tax	(5)	(142)
Unrealized pension plan gains and losses:
Unrealized pension plan (losses) before reclassifications		(562)
Tax effect		158
Net of tax		(404)
Reclassification adjustment for realized losses included in net income	75	89
Tax effect	(21)	(25)
Net of tax	54	64
Total other comprehensive income	2,611	3,509
Total comprehensive income	$ 8,641	$ 15,144