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Loans and Allowance - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Jan. 01, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |  |  |
Loans held for sale | $ 4,430,000 |  |  | $ 3,966,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 9,318,228,000 |  |  | 9,243,174,000
Interest income recognized on non-accrual loans | 0 | $ 0 |  |
Allowance for credit losses on unfunded loan commitments | 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
Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 2,178,832,000 |  |  | 2,220,949,000
Commercial and industrial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 2,876,212,000 |  |  | 2,776,699,000
Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 1,239,925,000 |  |  | 1,234,741,000
Percentage of troubled debt restructured loans | 6400.00% |  |  |
Mortgage loans with formal foreclosure proceedings | $ 3,300,000 | $ 507,000 |  |
PPP loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 741,700,000 |  |  | 667,100,000
30-59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 55,622,000 |  |  | 19,638,000
Increase (decrease) in past due loans | (36,000,000.0) |  |  |
30-59 Days Past Due | Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 45,942,000 |  |  | 2,525,000
30-59 Days Past Due | Commercial and industrial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 4,545,000 |  |  | 5,866,000
30-59 Days Past Due | Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 1,582,000 |  |  | 3,269,000
30-59 Days Past Due | Multifamily | Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 24,100,000 |  |  |
30-59 Days Past Due | Hotel | Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 21,000,000.0 |  |  |
60-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 2,978,000 |  |  | 11,187,000
Increase (decrease) in past due loans | 8,200,000 |  |  |
60-89 Days Past Due | Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 434,000 |  |  | 2,109,000
60-89 Days Past Due | Commercial and industrial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 19,000 |  |  | 6,571,000
Increase (decrease) in past due loans | (5,000,000.0) |  |  |
60-89 Days Past Due | Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 377,000 |  |  | 1,429,000
90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 47,390,000 |  |  | 41,950,000
Increase (decrease) in past due loans | (5,400,000) |  |  |
90 Days or More Past Due | Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 38,353,000 |  |  | 31,634,000
Increase (decrease) in past due loans | 3,700,000 |  |  |
90 Days or More Past Due | Commercial and industrial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 1,212,000 |  |  | 2,789,000
90 Days or More Past Due | Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past due | 3,493,000 |  |  | $ 3,264,000
90 Days or More Past Due | Nursing Home | Commercial real estate, non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in past due loans | $ (13,000,000.0) |  |  |

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