CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 10,567	$ 12,930
Less: Net loss attributable to noncontrolling interest	(360)	(93)
Net Income (Loss) Attributable to Parent, Total	10,927	13,023
Net change in unrealized gains on investment securities available-for-sale
Net unrealized gains arising during the period, net of tax expense of $14,538 and $5,452, respectively	46,036	17,265
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $166 and $4, respectively	(527)	(11)
Net change in unrealized gains (losses) on investment securities available-for-sale	45,509	17,254
Net change in securities held-to-maturity
Amortization of unrealized gain on securities reclassified to held-to-maturity, net of tax expense of $21 and $29, respectively	(65)	(93)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized gain (loss), prior service cost and transition obligation, net of tax (benefit) expense of $1 and $(8), respectively	4	(141)
Net change in cash flow hedge
Net unrealized gain arising during the period, net of tax expense of $501 and $199, respectively	1,585	630
Total other comprehensive income	47,033	17,650
Total comprehensive income	$ 57,960	$ 30,673