Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ (236)		$ (236)			$ (60)
Off-Balance Sheet, Credit Loss, Liability	2,400		2,400		$ 2,200	2,900
Loans and leases, net of deferred fees and costs (b)	4,491,028		4,491,028			$ 3,402,940
Performance-based insurance commissions	$ 60	$ 9	$ 2,044	$ 1,437