CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 205,531	$ 148,600	$ 164,460
Unrealized gains/losses on securities available-for-sale:
Unrealized holding gain (loss) arising during the period	(30,042)	74,067	61,649
Reclassification adjustment for losses (gains) included in net income	(5,674)	(11,895)	(4,415)
Tax effect	7,502	(13,056)	(12,019)
Net of tax	(28,214)	49,116	45,215
Unrealized gain/loss on cash flow hedges:
Unrealized holding gain (loss) arising during the period	138	(1,480)	(1,072)
Reclassification adjustment for losses (gains) included in net income	1,044	906	334
Tax effect	(248)	121	156
Net of tax	934	(453)	(582)
Net gain (loss) arising during the period
Net gain (loss) arising during the period	9,482	(2,237)	5,796
Reclassification adjustment for amortization of prior service cost	84	84	106
Tax effect	(2,009)	452	(1,239)
Net of tax	7,557	(1,701)	4,663
Total other comprehensive income (loss), net of tax	(19,723)	46,962	49,296
Comprehensive income	$ 185,808	$ 195,562	$ 213,756