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Loans - Nonaccrual loans (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Loans |  |  |  |
Total loans on nonaccrual status |  | $ 95,188,000 | $ 33,141,000 |
Greater than 90 Days Accruing |  | 11,651,000 |  |
Non-accrual with no allowance |  | 11,253,000 |  |
Addition of loans formerly accounted for as credit impaired loans |  | 21,000,000.0 |  |
Loans |  | $ 24,206,825,000 | 11,313,113,000 |
Number of months generally required to return to accruing status |  | 6 months |  |
Decrease in overall collateral dependent loans |  |  | (14,900,000) |
Loans individually evaluated for impairment | $ 1,000,000.0 |  |  | $ 500,000
CSFL |  |  |  |
Loans |  |  |  |
Increase in overall collateral dependent loans | $ 17,600,000 |  |  |
Acquired credit impaired loans | CSFL |  |  |  |
Loans |  |  |  |
Loans |  | $ 69,300,000 |  |
Commercial loans | Construction and land development |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 2,421,000 | 1,193,000 |
Non-accrual with no allowance |  | 533,000 |  |
Commercial loans | Commercial non-owner occupied |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 4,596,000 | 1,154,000 |
Greater than 90 Days Accruing |  | 471,000 |  |
Commercial loans | Commercial non-owner occupied real estate |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 26,059,000 | 4,385,000 |
Non-accrual with no allowance |  | 9,351,000 |  |
Commercial loans | Commercial and industrial |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 9,218,000 | 6,913,000 |
Greater than 90 Days Accruing |  | 10,864,000 |  |
Non-accrual with no allowance |  | 585,000 |  |
Commercial loans | Other income producing property |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 6,130,000 | 1,947,000 |
Greater than 90 Days Accruing |  | 278,000 |  |
Non-accrual with no allowance |  | 349,000 |  |
Consumer | Consumer Owner Occupied Loans |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 30,746,000 | 9,718,000 |
Greater than 90 Days Accruing |  | 34,000 |  |
Non-accrual with no allowance |  | 383,000 |  |
Consumer | Home equity loans |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 9,944,000 | 4,640,000 |
Non-accrual with no allowance |  | 52,000 |  |
Consumer | Consumer |  |  |  |
Loans |  |  |  |
Total loans on nonaccrual status |  | 6,074,000 | $ 3,191,000 |
Greater than 90 Days Accruing |  | $ 4,000 |  |

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