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Regulatory Capital and Dividends - Narrative (Details) - USD ($) |  | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 03, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Dividends available |  |  | $ 189,371,000 |  |  |
Dividend reinvestment and stock purchase plan, stockholder's maximum amount of cash payments per quarter in purchase of common stock |  |  | 5,000 |  |  |
Issuance of common stock related to acquisitions |  |  | 229,926,000 | $ 0 | $ 321,431,000 |
Repurchases of common stock |  |  | $ 19,041,000 |  |  |
Stock Repurchase Program |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Stock authorized to be repurchased (in shares) |  |  |  |  |  | 3,000,000
Stock authorized to be repurchased |  |  |  |  |  | $ 75,000,000
Percent of outstanding shares |  |  |  |  |  | 5.00%
Repurchases of common stock (in shares) |  | 516,016 |  |  |  |
Repurchases of common stock |  | $ 19,000,000.0 |  |  |  |
Average price (in usd per share) |  | $ 36.90 |  |  |  |
MBT |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Percentage of interest acquired | 100.00% |  |  |  |  |
Common Stock |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of shares of common stock | 0.275 |  |  |  |  |
Stock issued as a part of acquisition (in shares) |  |  | 6,383,806 |  | 8,044,446 |
Issuance of common stock related to acquisitions |  |  | $ 798,000 |  | $ 1,006,000 |
Repurchases of common stock (in shares) |  |  | 516,016 |  |  |
Repurchases of common stock |  |  | $ 65,000 |  |  |
Common Stock | MBT |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of shares of common stock | 0.275 |  |  |  |  |
Stock issued as a part of acquisition (in shares) | 6,400,000 |  |  |  |  |
Issuance of common stock related to acquisitions | $ 229,900,000 |  |  |  |  |

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