Debt Securities - Proceeds From Sales and Calls of Debt Securities and Associates Gains or Losses (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Available-for-sale
Proceeds from sales and calls of debt securities		$ 54,336	$ 77,073
Gross realized gains	[1]	369	962
Gross realized losses	[1]	(43)	(100)
Held-to-maturity
Proceeds from calls of debt securities		4,130	20,250
Gross realized gains	[1]	0	1
Gross realized losses	[1]	$ (42)	$ 0

[1] The gain or loss on the sale or call of each debt security is determined by the specific identification method.