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Loans Acquired - Textual (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Apr. 12, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Net loans | $ 12,936,959,000 |  | $ 12,936,959,000 |  |  |  | $ 11,666,572,000 |  |
Loans | 13,000,000,000.00 |  | 13,000,000,000.00 |  |  |  | 11,720,000,000 |  |
Allowance for loan losses | 66,590,000 | $ 56,703,000 | 66,590,000 | $ 56,703,000 | $ 64,179,000 |  | 56,694,000 | $ 53,776,000 | $ 42,086,000
Provision for loan losses | 21,973,000 | 10,345,000 | 38,337,000 | 28,528,000 |  |  |  |  |
Loans acquired, net |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses | 597,000 | 1,345,000 | 597,000 | 1,345,000 | $ 1,112,000 |  | $ 95,000 | $ 2,044,000 | $ 418,000
Provision for loan losses | $ 0 | $ 0 | $ 2,464,000 | $ 1,837,000 |  |  |  |  |
Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Net loans |  |  |  |  |  | $ 1,100,000,000 |  |  |
Accounting Standards Update 2017-08 | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Net loans |  |  |  |  |  | 1,097,000,000.000 |  |  |
Loans |  |  |  |  |  | 1,127,000,000 |  |  |
Allowance for loan losses |  |  |  |  |  | 30,600,000 |  |  |
Accounting Standards Update 2016-13 | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Net loans |  |  |  |  |  | 176,000 |  |  |
Loans |  |  |  |  |  | 385,000 |  |  |
Allowance for loan losses |  |  |  |  |  | $ 209,000 |  |  |

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