Other Intangibles - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 102,396	$ 85,869
Accumulated amortization	(73,421)	(67,434)
Total core deposit and other intangibles	28,975	34,962
Core deposit intangible acquired
Acquired Finite-Lived Intangible Assets [Line Items]
Intangibles acquired	$ 0	$ 16,527