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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 |  |  |

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