CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 11,635	$ 4,251
Unrealized gains and losses on securities:
Unrealized holding gains (losses) on available-for-sale securities arising during the period	5,558	(5,019)
Tax effect	(1,422)	1,292
Net of tax	4,136	(3,727)
Reclassification adjustment for realized gains included in net income	(8)
Tax effect	2
Net of tax	(6)
Unrealized (losses) gains on cash flow hedge	(391)	916
Tax effect	110	(258)
Net of tax	(281)	658
Unrealized pension plan (losses) gains:
Unrealized pension plan (losses) gains before reclassifications	(562)	236
Tax effect	158	(67)
Net of tax	(404)	169
Reclassification adjustment for realized losses included in net income	89	91
Tax effect	(25)	(25)
Net of tax	64	66
Total other comprehensive income (loss)	3,509	(2,834)
Total comprehensive income	$ 15,144	$ 1,417