Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains (losses), tax (benefit) expense	$ (29,523)	$ 12,585	$ 13,179
Reclassification adjustment for gains, tax expense	80	2,178	80
Amortization of unrealized gain on securities reclassified to held-to-maturity, tax expense	32	60	98
Change in unfunded pension liability related to unrealized (loss) gain, prior service cost and transition obligation, tax (benefit) expense	50	(585)	(1,439)
Pension settlement, tax	0	67	0
Net change in cash flow hedge, tax expense	0	493	593
Amortization of unrealized gain on terminated cash flow hedges, tax benefit	(119)	106	0
Equity method investment tax expense (benefit)	$ 114	$ (3)	$ 0