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Acquisitions - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 17, 2021 USD ($) county branch | Mar. 26, 2019 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of goodwill |  |  | $ 154,572 | $ 151,238 | $ 151,238
Common stock, shares outstanding | shares |  |  | 43,547,942 | 43,880,562 |
TCF National Bank |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch | 14 |  |  |  |
Number of counties branches acquired | county | 11 |  |  |  |
Net cash received | $ (618,200) |  |  |  |
Total loans | 212,000 |  |  |  |
Premises and equipment, net | 6,901 |  |  |  |
Cash and due from banks | $ 4,012 |  |  |  |
Percentage of premium on deposits | 1.75% |  |  |  |
Customer deposits | $ 846,400 |  |  |  |
Net intangible assets acquired | 1,630 |  |  |  |
Acquisition of goodwill | $ 3,334 |  |  |  |
TCF National Bank | Customer-Related Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Useful life | 10 years |  |  |  |
Salin |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total loans |  | $ 568,918 |  |  |
Premises and equipment, net |  | 20,425 |  |  |
Cash and due from banks |  | 152,745 |  |  |
Net intangible assets acquired |  | 19,818 |  |  |
Acquisition of goodwill |  | $ 31,358 |  |  |
Exchange ratio per share |  | 23907.50% |  |  |
Cash paid for each share (in USD per share) | $ / shares |  | $ 87,417.17 |  |  |
Common stock, shares outstanding | shares |  | 275 |  |  |
Common stock issued (in shares) | shares |  | 6,563,697 |  |  |
Market closing price per share | $ / shares |  | $ 15.65 |  |  |
Estimated transaction value |  | $ 126,700 |  |  |
Costs related to the acquisition |  | 5,600 |  |  |
Total purchase price |  | $ 126,722 |  |  |
Core deposit intangible amortization period |  |  | 10 years |  |

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