Accumulated Other Comprehensive Income - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 5,283	$ 48	$ 2
Affected Line Item in the Statements of Income Member | Net realized gains on available-for-sale securities (total reclassified amount before tax)
Unrealized gains on available-for-sale securities reclassified out of AOCI	78	(62)	2
Affected Line Item in the Statements of Income Member | Amortization of realized gain on termination of cash flow hedge
Change in fair value of cash flow hedge available-for-sale securities reclassified out of AOCI	6,764	0	0
Affected Line Item in the Statements of Income Member | Tax Expense (Benefit)
Income taxes on unrealized gains on available-for-sale securities reclassified out of AOCI	$ (1,559)	$ 14	$ 0