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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance	$ 274,769	$ 274,769
Goodwill acquired	5,772	0
Ending balance	280,541	274,769	$ 274,769
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	36,008	43,574
Less: accumulated amortization	24,273	31,554
Net carrying amount	11,735	12,020
Impairment of goodwill	0	0
Amortization Expense [Abstract]
Amortization of intangible assets	3,395	3,579	$ 4,042
Future Amortization Expense [Abstract]
2021	2,800
2022	2,200
2023	1,800
2024	1,500
2025	1,200
Thereafter	2,300
Impairment of intangible assets	$ 0	0
Minimum [Member]
Finite-Lived Intangible Assets [Abstract]
Intangible asset useful life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Abstract]
Intangible asset useful life	20 years
Core Deposits Intangibles [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	$ 8,951	8,951
Less: accumulated amortization	8,463	7,988
Net carrying amount	488	963
Identified Intangible Assets [Member]
Finite-Lived Intangible Assets [Abstract]
Gross carrying amount	27,057	34,623
Less: accumulated amortization	15,810	23,566
Net carrying amount	$ 11,247	$ 11,057

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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