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Loans and Allowance - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |  |  |  |  |  |
Loans held for sale | $ 18,582,000 |  | $ 18,582,000 |  |  |  | $ 3,966,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 9,121,250,000 |  | 9,121,250,000 |  |  |  | 9,243,174,000
Interest income recognized on non-accrual loans | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Standby letters of credit usual term | 2 years |  | 2 years |  |  |  |
Allowance for credit losses on unfunded loan commitments | $ 20,500,000 |  | $ 20,500,000 |  | $ 20,500,000 |  | 0
Cumulative effect of ASC 326 adoption |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans |  |  |  |  |  | $ 4,776,000 |
Allowance for credit losses on unfunded loan commitments | 20,500,000 |  | 20,500,000 |  |  | $ 20,500,000 |
30-59 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 13,007,000 |  | 13,007,000 |  |  |  | 19,638,000
Increase (decrease) in past due loans |  |  | 6,600,000 |  |  |  |
Financial Asset, Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 68,400,000 |  | 68,400,000 |  |  |  | 72,800,000
Increase (decrease) in past due loans |  |  | 4,400,000 |  |  |  |
PPP loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 415,800,000 |  | 415,800,000 |  |  |  | 667,100,000
Residential |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 1,127,442,000 |  | $ 1,127,442,000 |  |  |  | 1,234,741,000
Percentage of troubled debt restructured loans | 7600.00% |  | 6500.00% |  |  |  |
Mortgage loans with formal foreclosure proceedings | $ 3,200,000 | $ 492,000 | $ 3,200,000 | $ 492,000 |  |  |
Residential | 30-59 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 2,276,000 |  | $ 2,276,000 |  |  |  | $ 3,269,000

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