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Business Combinations - Additional Information (Details) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Jan. 31, 2019 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Merger related expenses |  |  |  | $ 1,194 | $ 3,156 | $ 3,070 | $ 8,527 | $ 15,947 | $ 10,503 | $ 26,911
Two River Bancorp Acquisition |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, assets | $ 1,111,621 |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, loans | 940,072 |  |  |  |  |  |  |  |  |
Deposits | 941,750 |  |  |  |  |  |  |  |  |
Consideration paid | 197,050 |  |  |  |  |  |  |  |  |
Cash consideration paid for outstanding warrants and fractional shares | 48,400 |  |  |  |  |  |  |  |  |
Number of properties in lease agreements | property |  |  |  |  |  |  |  | 14 |  |
Core deposit intangible | 12,130 |  |  |  |  |  |  |  |  |
Country Bank Holding Company, Inc. Acquisition |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, assets | 793,680 |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, loans | 618,408 |  |  |  |  |  |  |  |  |
Deposits | 652,653 |  |  |  |  |  |  |  |  |
Consideration paid | 112,836 |  |  |  |  |  |  |  |  |
Number of properties in lease agreements | property |  |  |  |  |  |  |  | 5 |  |
Core deposit intangible | $ 2,117 |  |  |  |  |  |  |  |  |
Sun Bancorp, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, assets |  |  | $ 2,044,054 |  |  |  |  |  |  |
Purchase accounting adjustments, loans |  |  | 1,517,345 |  |  |  |  |  |  |
Deposits |  |  | 1,616,073 |  |  |  |  |  |  |
Consideration paid |  |  | 474,930 |  |  |  |  |  |  |
Cash consideration paid for outstanding warrants and fractional shares |  |  | 72,400 |  |  |  |  |  |  |
Number of properties in lease agreements | property |  |  |  |  |  |  |  | 21 |  |
Core deposit intangible |  | $ 2,662 |  |  |  |  |  |  |  |
Weighted average useful life (years) |  |  |  |  |  |  |  | 10 years |  |
Capital Bank |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, assets |  | 494,416 |  |  |  |  |  |  |  |
Purchase accounting adjustments, loans |  | 307,300 |  |  |  |  |  |  |  |
Deposits |  | 449,018 |  |  |  |  |  |  |  |
Consideration paid |  | 76,834 |  |  |  |  |  |  |  |
Cash consideration paid for outstanding warrants and fractional shares |  | $ 353 |  |  |  |  |  |  |  |
Number of properties in lease agreements | property |  |  |  |  |  |  |  | 1 |  |
Core deposit intangible |  |  | $ 11,897 |  |  |  |  |  |  |

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