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Acquisition - Summary (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 06, 2019 | Apr. 03, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value of Liabilities Assumed |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 0 | $ (332,468) | $ (705)
Santander Bank, N.A. [Member] |  |  |  |  |
Fair Value of Assets Acquired |  |  |  |  |
Cash and cash equivalents | $ 2,935 |  |  |  |
Loans | 99,956 |  |  |  |
Premises and other equipment | 3,637 |  |  |  |
Core deposit intangible | 5,615 |  |  |  |
Other assets | 770 |  |  |  |
Total assets acquired | 112,913 |  |  |  |
Fair Value of Liabilities Assumed |  |  |  |  |
Deposits | 471,386 |  |  |  |
Other Liabilities | 186 |  |  |  |
Total liabilities assumed | 471,572 |  |  |  |
Total Fair Value of Identifiable Net Assets | (358,659) |  |  |  |
Goodwill, Acquired During Period | $ 29,126 |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 329,533 |  |  |

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