CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Unrealized holding gain (loss) on securities arising during the period, income tax expense (benefit)	$ (16,200)	$ (47,400)	$ 18,200	$ (63,500)	$ (10,900)
Reclassification adjustment for net (gains) losses on sale of securities included in net income, income tax expense (benefit)	(9)	609	1,500	600	2,600
Unrealized loss on securities transferred from available-for-sale to held-to maturity, income tax (benefit)	(12,500)	(6,600)	0	(19,100)	0
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity, income tax expense (benefit)	$ 396	$ 121	$ 0	$ 517	$ 0