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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 7,106,142,000 |  | $ 7,112,474,000 |
expense related to other repossessed assets | 0 |  |  |
Alternative Investment | 21,795,000 |  | 21,522,000 |
Loans Held-for-sale, Fair Value Disclosure | 17,766,000 |  | 31,666,000 |
Impaired Financing Receivable, Carrying Value | $ 95,445,000 |  | 103,021,000 |
Discount percentage applied to real estate appraised values | 15.00% |  |  |
Discount percentage applied to lot development appraised values | 6.00% |  |  |
Partial Charge-Offs On Impaired Loans | $ 589,000 |  | 655,000 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,962,000 |  | 5,434,000 |
Impaired Financing Receivable, Related Allowance |  |  | 5,434,000 |
Impaired Loan Fair Value | 7,484,000 |  | 6,924,000 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 203,000 |  | 269,000 |
Book Value Of Impaired Loans Carried At Fair Value | 7,890,000 |  | 8,256,000 |
Impaired Financing Receivable, carried at fair value, related expense | 900,000 | $ (57,000) |  |
MSR recorded at lower of cost or fair value | 13,635,000 | 8,768,000 | 12,210,000 | $ 10,070,000
Mortgage Servicing Rights Fair Value | 13,300,000 |  | 12,200,000 |
Valuation allowance of MSR | 2,337,000 | 2,351,000 | 3,189,000 | $ 825,000
MSRs recorded at cost | 328,000 |  | 31,000 |
Changes due to fair value adjustments | (852,000) | 1,526,000 |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 844,000 |  | $ 1,431,000 |
Percent of OREO held at fair value | 87.00% |  | 51.00% |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | $ 735,000 |  |  |
OREO valuation adjustments | 0 | 2,000 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 6,200,000 |  |  |
Alternative Investment, income recognized | 1,400,000 | $ (204,000) |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Alternative Investment | 15,600,000 |  | $ 15,400,000 |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 406,000 |  | 1,332,000 |
Financing Receivable, not collateral dependent [Domain] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Impaired Financing Receivable, Related Allowance | 4,556,000 |  | 4,102,000 |
Fair Value, Nonrecurring [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 7,484,000 |  | $ 6,924,000 |

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