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	$ 77,764	$ 98,739	$ 67,275
Available-for-sale securities:
Unrealized gains (losses) on available-for-sale securities, net of tax expense of $5.0 million in 2020, tax expense of $5.9 million in 2019 and tax benefit of $3.5 million in 2018	16,628	19,016	(9,815)
Reclassification of unrealized losses on securities transferred to available-for-sale upon adoption of new accounting pronouncement, net of tax benefit of $154 thousand in 2019	0	(730)	0
Amortization of unrealized losses on securities transferred to held-to-maturity, net of tax expense of $40 thousand, $87 thousand, and $142 thousand, respectively	184	175	408
Reclassification adjustment for (gains) losses included in net income, net of tax expense of $314 thousand in 2020, tax expense of $95 thousand in 2019 and tax benefit of $37 thousand in 2018	(782)	(936)	448
Available-for-sale securities, net of tax	16,030	17,525	(8,959)
Unrealized losses on derivatives designated as cash flow hedges, net of reclassifications to income, net of tax expense of $42 thousand	(125)	0	0
Total other comprehensive income (loss)	15,905	17,525	(8,959)
Comprehensive Income	$ 93,669	$ 116,264	$ 58,316