CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 60,351	$ 159,718	$ 123,340
Other comprehensive income, net of tax:
Unrealized holding gains/(losses) on securities arising during the period, net of income tax expense (benefits)	[1]	48,674	33,226	(5,019)
Reclassification adjustment for net gain on sale of securities included in net income, net of income taxes	[2]	(9,905)	(6,102)	(1,079)
Other comprehensive income (loss), net of tax		38,769	27,124	(6,098)
Comprehensive income, net of tax		$ 99,120	$ 186,842	$ 117,242

[1] (1) Income tax expense (benefit) on unrealized holding gains (losses) on securities was $19.5 million for 2020, $13.4 million for 2019, and $(2.2) million for 2018.

[2] (2) Income tax expense on reclassification adjustment for net gain on sale of securities included in net income was $4.0 million for 2020, $2.5 million for 2019, and $320,000 for 2018.