Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands	Apr. 01, 2022 USD ($) banking_center $ / shares shares	Apr. 01, 2021 USD ($)	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
Business Acquisition [Line Items]
Liquidation value per share (in dollars per share) | $ / shares			$ 1,000	$ 1,000
Total assets			$ 15,465,258	$ 15,453,149
Total loans			9,160,257	9,046,464
Deposits			12,905,953	$ 12,732,577
Level One Bancorp, Inc.
Business Acquisition [Line Items]
Total assets			2,400,000
Total loans			1,700,000
Deposits			$ 1,900,000
Subsequent event | Level One Bancorp, Inc.
Business Acquisition [Line Items]
Number of banking centers | banking_center	126
Subsequent event | Series B Preferred Stock
Business Acquisition [Line Items]
Exchange ratio	0.01
Subsequent event | 7.5% Non-cumulative Perpetual Preferred Stock | Level One Bancorp, Inc.
Business Acquisition [Line Items]
Entity Listing, Depository Receipt Ratio	0.01
Hoosier
Business Acquisition [Line Items]
Percentage of interest acquired		100.00%
Cash paid in acquisition		$ 3,225
Assets under management		290,000
Customer relationship intangible		2,247
Hoosier | Customer relationship intangible
Business Acquisition [Line Items]
Customer relationship intangible		$ 2,247
Estimated life		10 years
Level One Bancorp, Inc. | Subsequent event
Business Acquisition [Line Items]
Percentage of interest acquired	100.00%
Number of banking centers | banking_center	17
Exchange ratio	0.7167
Cash payment per share (in dollars per share) | $ / shares	$ 10.17
Common stock issued	$ 79,300
Level One Bancorp, Inc. | Subsequent event | Common Stock
Business Acquisition [Line Items]
Issuance of common stock related to acquisitions (in shares) | shares	5,600,000
Level One Bancorp, Inc. | Subsequent event | 7.5% Non-cumulative Perpetual Preferred Stock
Business Acquisition [Line Items]
Issuance of common stock related to acquisitions (in shares) | shares	10,000
Dividend rate, percentage	7.50%
Liquidation value per share (in dollars per share) | $ / shares	$ 2,500