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Non Purchased Loans - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Restructured loans discontinued past due period | 90 days |  |
Allowance for loan losses attributable to restructured loans | $ 52,162,000 | $ 49,026,000 |
Non-Purchased |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Nonperforming loans charged off past due period | 90 days |  |
Number of restructured loans | loan | 2 | 1 |
Restructured loans discontinued past due period | 90 days | 90 days |
Average recorded investment in impaired loans | $ 38,188,000 | $ 27,080,000 | $ 21,998,000
Interest income recognized on impaired loans |  |  | 573,000
Modifications, recorded investment | 4,679,000 | 5,325,000 | 5,588,000
Modifications, subsequent default, recorded investment |  | 139,000 | $ 184,000
Remaining availability under commitments to lend additional funds on restructured loans | 0 | 42,000 |
Unfunded commitment | 7,266,000 | 6,982,000 |
Non-Purchased | Nonaccruing Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Outstanding balance of restructured loans | 164,000 | 41,000 |
Non-Purchased | Restructured Loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Outstanding balance of restructured loans | 3,058,000 | 3,128,000 |
Allowance for loan losses attributable to restructured loans | $ 125,000 | $ 34,000 |

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