Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 01, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 901,312	$ 901,166	$ 901,312		$ 898,569		$ 808,322
Purchase accounting adjustments	2,743	0
Net intangible assets	77,363	$ 94,550	77,363	$ 81,364	85,500
Remainder of fiscal year	15,900		15,900
2022	14,000		14,000
2023	12,300		12,300
2024	11,100		11,100
2025	$ 10,000		10,000
Min
Goodwill [Line Items]
Weighted average useful life	6 years
Max
Goodwill [Line Items]
Weighted average useful life	11 years
Core Deposits
Goodwill [Line Items]
Net intangible assets	$ 74,500		74,500		82,500
Customer Relationships
Goodwill [Line Items]
Net intangible assets	2,900		2,900		$ 3,000
Opus Bank
Goodwill [Line Items]
Goodwill						$ 92,990
Purchase accounting adjustments	$ 2,700		$ 146