CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 73,395	$ 60,352	$ 43,220
Unrealized gains and losses:
Unrealized holding gains (losses) on available-for-sale securities arising during the period	11,286	(6,444)	(1,350)
Tax effect	(2,923)	1,638	532
Net of tax	8,363	(4,806)	(818)
Reclassification adjustment for realized losses (gains) included in net income	280		(1,596)
Tax effect	(79)		579
Net of tax	201		(1,017)
Unrealized (losses) gains on cash flow hedges	(755)	825	304
Tax effect	213	(228)	(124)
Net of tax	(542)	597	180
Reclassification adjustment for (gains) losses arising during this period	(677)	(464)	406
Tax effect	190	130	(166)
Net of tax	(487)	(334)	240
Unrealized pension plan (losses) gains:
Unrealized pension plan gains (losses) before reclassifications	(209)	236	(2)
Tax effect	59	(67)	1
Net of tax	(150)	169	(1)
Reclassification adjustment for realized losses included in net income	358	359	412
Tax effect	(101)	(101)	(169)
Net of tax	257	258	243
Total other comprehensive income (loss)	7,642	(4,116)	(1,173)
Total comprehensive income	$ 81,037	$ 56,236	$ 42,047