Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts Reclassified from AOCI [Abstract]
Securities gains (losses)	$ 1,769	$ 783	$ (85)
Tax expense (benefit)	10,761	7,452	11,314
Net income	59,504	64,540	59,228
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Amounts Reclassified from AOCI [Abstract]
Securities gains (losses)	1,251	3	(821)
Tax expense (benefit)	325	1	(172)
Net income	$ 926	$ 2	$ (649)