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Loans and Allowance - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Receivables [Abstract] |  |  |  |  |  |  |  |
Loans held for sale | $ 3,183 |  | $ 3,183 |  |  | $ 9,037 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Number of funded loans | loan |  |  | 5,200 |  |  |  |  |
Loans | 9,243,833 |  | $ 9,243,833 |  |  | 8,459,310 |  |
Loans - allowance for loan losses | 126,726 | $ 80,571 | 126,726 | $ 80,571 | $ 121,119 | 80,284 | $ 81,274 | $ 80,552
Increase in past due loans |  |  | 14,700 |  |  |  |  |
60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 11,777 |  | 11,777 |  |  | 1,195 |  |
30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 17,527 |  | 17,527 |  |  | 14,683 |  |
PPP, CARES Act |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans net of deferred fees | 901,400 |  | 901,400 |  |  |  |  |
Deferred fees | 21,500 |  | 21,500 |  |  |  |  |
University logo apparel sports |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in non-accrual loans |  |  | 2,800 |  |  |  |  |
Residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 1,673,864 |  | 1,673,864 |  |  | 1,732,201 |  |
Loans - allowance for loan losses | $ 22,047 | $ 14,498 | $ 22,047 | $ 14,498 | $ 21,078 | 14,569 | $ 14,471 | $ 14,322
Percentage of troubled debt restructured loans | 88.00% | 100.00% | 63.00% | 100.00% |  |  |  |
Mortgage loans with formal foreclosure proceedings | $ 5,059 |  | $ 5,059 |  |  | 1,033 |  |
Residential | 60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 1,000 |  | 1,000 |  |  | 367 |  |
Residential | 30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 2,743 |  | 2,743 |  |  | 4,290 |  |
Commercial and farmland | 60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in past due loans |  |  | 9,900 |  |  |  |  |
Past Due | 9,978 |  | 9,978 |  |  | 49 |  |
Commercial and farmland | 30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 964 |  | 964 |  |  | 2,324 |  |
Commercial and industrial loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in non-accrual loans |  |  | 4,700 |  |  |  |  |
Commercial and industrial loans | 60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 0 |  | 0 |  |  | 136 |  |
Commercial and industrial loans | 30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 4,529 |  | 4,529 |  |  | 3,039 |  |
Construction | 60-89 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | 0 |  | 0 |  |  | 0 |  |
Construction | 30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in past due loans |  |  | 5,900 |  |  |  |  |
Past Due | 7,575 |  | 7,575 |  |  | 1,630 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 7,457 |  | 7,457 |  |  | 13,309 |  |
Loans acquired with deteriorated credit quality | Commercial and consumer loan |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 3,738 |  | 3,738 |  |  | 2,819 |  |
Loans - allowance for loan losses | 116 |  | 116 |  |  | 124 |  |
Loans acquired with deteriorated credit quality | Residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 0 |  | 0 |  |  | $ 1,715 |  |
Three relationships |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in non-accrual loans |  |  | 40,800 |  |  |  |  |
Three relationships | Senior living sector |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in non-accrual loans |  |  | 31,200 |  |  |  |  |
Three relationships | Commercial and farmland |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in non-accrual loans |  |  | 36,000 |  |  |  |  |
Three relationships | Self-storage |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in non-accrual loans |  |  | 3,400 |  |  |  |  |
One relationship | Construction | 30-59 Days Past Due |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Past Due | $ 7,500 |  | $ 7,500 |  |  |  |  |

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