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Loans and Allowance - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |  |  |  |  |  |
Loans held for sale | $ 5,990,000 |  | $ 5,990,000 |  |  |  | $ 3,966,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 9,041,576,000 |  | 9,041,576,000 |  |  |  | 9,243,174,000
Non-Accrual Loans | 51,502,000 |  | 51,502,000 |  |  |  | 61,471,000
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 |
Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 38,900,000 |  | 38,900,000 |  |  |  | 72,800,000
Increase (decrease) in past due loans |  |  | 33,900,000 |  |  |  |
30-59 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 12,170,000 |  | 12,170,000 |  |  |  | 19,638,000
Increase (decrease) in past due loans |  |  | 7,500,000 |  |  |  |
60-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 3,541,000 |  | 3,541,000 |  |  |  | 11,187,000
Increase (decrease) in past due loans |  |  | 7,600,000 |  |  |  |
90 Days or More Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 23,163,000 |  | 23,163,000 |  |  |  | 41,950,000
Increase (decrease) in past due loans |  |  | 18,800,000 |  |  |  |
PPP loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 198,100,000 |  | 198,100,000 |  |  |  | 667,100,000
Commercial real estate, non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 2,150,387,000 |  | 2,150,387,000 |  |  |  | 2,220,949,000
Non-Accrual Loans | 26,176,000 |  | 26,176,000 |  |  |  | 46,316,000
Commercial real estate, non-owner occupied | 30-59 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 4,698,000 |  | 4,698,000 |  |  |  | 2,525,000
Commercial real estate, non-owner occupied | 60-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 424,000 |  | 424,000 |  |  |  | 2,109,000
Commercial real estate, non-owner occupied | 90 Days or More Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 3,210,000 |  | 3,210,000 |  |  |  | 31,634,000
Payoff |  |  | 23,400,000 |  |  |  |
Commercial and industrial loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 2,573,615,000 |  | 2,573,615,000 |  |  |  | 2,776,699,000
Non-Accrual Loans | 16,817,000 |  | 16,817,000 |  |  |  | 2,329,000
Commercial and industrial loans | 30-59 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 2,667,000 |  | 2,667,000 |  |  |  | 5,866,000
Commercial and industrial loans | 60-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 507,000 |  | 507,000 |  |  |  | 6,571,000
Commercial and industrial loans | 90 Days or More Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 16,330,000 |  | 16,330,000 |  |  |  | 2,789,000
Increase (decrease) in past due loans |  |  | (13,500,000) |  |  |  |
Non-Accrual Loans | $ 11,400,000 |  | $ 11,400,000 |  |  |  |
Commercial Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of troubled debt restructured loans | 9990.00% |  | 9230.00% |  |  |  |
Residential |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 1,154,373,000 |  | $ 1,154,373,000 |  |  |  | 1,234,741,000
Non-Accrual Loans | 5,556,000 |  | 5,556,000 |  |  |  | 6,517,000
Mortgage loans with formal foreclosure proceedings | 3,900,000 | $ 5,100,000 | 3,900,000 | $ 5,100,000 |  |  |
Residential | 30-59 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 2,982,000 |  | 2,982,000 |  |  |  | 3,269,000
Residential | 60-89 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 1,195,000 |  | 1,195,000 |  |  |  | 1,429,000
Residential | 90 Days or More Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 2,231,000 |  | $ 2,231,000 |  |  |  | $ 3,264,000

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