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Loans, Allowance for Credit Losses, and Asset Quality Information (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
PPP loans approved and funded | $ 66,900 |  | $ 240,500 |  |  |
Unamortized net deferred loan fees | 3,389 | $ 5,439 | 3,698 |  |  |
Unamortized discount on loans acquired | 4,800 |  |  |  |  |
Payments that exceeded carrying amount of PCI loans |  | 446 |  |  |  |
Loan discount accretion income |  | 352 |  |  |  |
Additional loan interest income |  | 80 |  |  |  |
Recovery |  | 14 |  |  |  |
Interest income on restructured loans |  |  | 1,100 |  |  |
Loans, gross | 4,873,230 | 4,819,175 | 4,735,013 |  |  |
Allowance for loan losses | 63,628 | $ 49,226 | 52,388 | $ 65,022 | $ 42,342 | $ 21,398
Special Mention Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans, gross | 40,700 |  | 61,260 |  |  |
Classified |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans, gross | $ 53,300 |  |  |  |  |
Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans | 90.00% |  |  |  |  |
Hotel | Minimum |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans | 10.00% |  |  |  |  |
Hotel | Maximum |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans | 25.00% |  |  |  |  |
Non Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Threshold percentage to write-off nonaccrual loans | 75.00% |  |  |  |  |
Real estate – mortgage – residential (1-4 family) first mortgages |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Presold mortgages in process of settlement | $ 1,900 |  | 1,900 |  |  |
Unfunded Loan Commitment |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Allowance for loan losses | 11,074 |  | 582 |  |  |
PCI Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans, gross |  |  | 8,591 |  |  |
PCI Loans | Purchased Credit Impaired Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Carrying value of PCI loans |  |  | 8,600 |  |  |
PCI Loans | Special Mention Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loans, gross |  |  | 85 |  |  |
SBA PPP loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Unamortized net deferred loan fees | 4,300 |  | 6,000 |  |  |
SBA Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Remaining unaccreted discount | $ 6,600 |  | 7,300 |  |  |
Purchased Non-Impaired Loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Remaining unaccreted discount |  |  | $ 7,900 |  |  |

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