Debt Securities - Proceeds From Sales and Calls of Debt Securities and Associates Gains or Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Available-for-sale
Proceeds from sales and calls of debt securities	$ 74,328	$ 69,304	$ 151,025	$ 184,088
Gross realized gains	507	102	945	1,206
Gross realized losses	(9)	(78)	(75)	(192)
Held-to-maturity
Proceeds from calls of debt securities	19,120	9,280	25,480	29,530
Gross realized gains	0	0	0	1
Gross realized losses	$ (666)	$ 0	$ (815)	$ 0