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Acquisitions - Narrative (Details) $ in Thousands			12 Months Ended
	Nov. 09, 2020 USD ($)	Sep. 01, 2019 USD ($) instrument shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Issuance of common stock related to acquisitions			$ 0	$ 229,926	$ 0
Common Stock
Business Acquisition [Line Items]
Number of shares of common stock		0.275
Stock issued as a part of acquisition (in shares) | shares				6,383,806
Issuance of common stock related to acquisitions				$ 798
Hoosier Trust Company
Business Acquisition [Line Items]
The consideration to be paid to the shareholders in cash	$ 3,225
MBT
Business Acquisition [Line Items]
Percentage of interest acquired		100.00%
Number of banking centers acquired | instrument		20
Other intangible assets		$ 16,527
Operating revenue				19,700
Non-recurring expenses				$ 19,700
MBT | Core deposit intangible acquired
Business Acquisition [Line Items]
Other intangible assets		$ 16,527
Acquired intangible asset, expected useful life		10 years
MBT | Common Stock
Business Acquisition [Line Items]
Number of shares of common stock		0.275
Stock issued as a part of acquisition (in shares) | shares		6,400,000
Issuance of common stock related to acquisitions		$ 229,900

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