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Loans and Allowance for Loan Losses - Textual (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | $ 13,000,000,000.00 |  | $ 13,000,000,000.00 |  | $ 11,720,000,000
Recorded investment | 70,007,000 |  | 70,007,000 |  | 39,770,000
Impaired loan, related allowance | 5,279,000 |  | 5,279,000 |  | 684,000
Interest income recognized | 400,000 | $ 400,000 | 1,200,000 | $ 1,100,000 |
Average Investment in Impaired Loans | $ 64,550,000 | $ 44,309,000 | $ 56,612,000 | $ 44,952,000 |
Troubled debt, number of contracts | loan | 1 | 6 | 1 | 8 |
Balance prior to TDR | $ 330,000 | $ 2,854,000 | $ 330,000 | $ 3,006,000 |
Financial impact on date of restructure | 0 | 402,000 | 0 | 402,000 |
Foreclosed assets and other real estate owned | 19,576,000 |  | 19,576,000 |  | 25,565,000
Risk Rate 6 | Financial Asset Acquired with Credit Deterioration |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans acquired | 3,100,000 |  | 3,100,000 |  | 4,100,000
Risk Ratings 6,7, and 8 |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans acquired excluding loans accounted for under ASC Topic 310-30 | 146,200,000 |  | 146,200,000 |  | 119,000,000.0
Risk Ratings 6,7, and 8 | Financial Asset Acquired with Credit Deterioration |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans acquired excluding loans accounted for under ASC Topic 310-30 | 37,400,000 |  | 37,400,000 |  | 50,400,000
Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans in process of foreclosure, amount | 3,925,000 |  | 3,925,000 |  | 3,899,000
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Foreclosed assets and other real estate owned | 4,401,000 |  | 4,401,000 |  | 3,530,000
Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | 6,792,021,000 |  | 6,792,021,000 |  | 5,966,453,000
Recorded investment | 33,203,000 |  | 33,203,000 |  | 24,253,000
Impaired loan, related allowance | 659,000 |  | 659,000 |  | $ 247,000
Interest income recognized | 172,000 | 217,000 | 526,000 | 688,000 |
Average Investment in Impaired Loans | $ 29,631,000 | $ 27,270,000 | $ 27,123,000 | $ 29,581,000 |
Troubled debt, number of contracts | loan | 1 | 3 | 1 | 4 |
Balance prior to TDR | $ 330,000 | $ 491,000 | $ 330,000 | $ 552,000 |
Financial impact on date of restructure | $ 0 | $ 212,000 | 0 | 212,000 |
Real Estate | OREO Received in Full or Partial Satisfaction of Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Balance prior to TDR |  |  | $ 0 | $ 294,300 |
Commercial Real Estate | Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loans with subsequent default | loan |  |  | 4 | 1 |
Write-down of impaired loans |  |  | $ 552,000 | $ 66,300 |
Transfers of loans |  |  |  | $ 294,300 |

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