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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 6,844,788,000 |  | $ 6,844,788,000 |  | $ 7,112,474,000 |  |  |
expense related to other repossessed assets | 0 | $ 207,000,000 | 0 | $ 207,000,000 |  |  |  |
Alternative Investment | 21,260,000 |  | 21,260,000 |  | 21,522,000 |  |  |
Loans Held-for-sale, Fair Value Disclosure | 8,944,000 |  | 8,944,000 |  | 31,666,000 |  |  |
Impaired Financing Receivable, Carrying Value | 75,798,000 |  | $ 75,798,000 |  | 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 |  |  | $ 688,000 |  | 655,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 3,466,000 |  | 3,466,000 |  | 5,434,000 |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  | 5,434,000 |  |  |
Impaired Loan Fair Value | 848,000 |  | 848,000 |  | 6,924,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 240,000 |  | 269,000 |  |  |
Book Value Of Impaired Loans Carried At Fair Value | 1,028,000 |  | 1,028,000 |  | 8,256,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | (83,000) | (3,100,000) | 462,000 | (3,500,000) |  |  |  |
MSR recorded at lower of cost or fair value | 14,556,000 | 11,040,000 | 14,556,000 | 11,040,000 | 12,210,000 | $ 14,316,000 | $ 9,505,000 | $ 10,070,000
Mortgage Servicing Rights Fair Value | 14,300,000 |  | 14,300,000 |  | 12,200,000 |  |  |
Valuation allowance of MSR | 2,151,000 | 2,798,000 | 2,151,000 | 2,798,000 | 3,189,000 | $ 2,112,000 | $ 2,600,000 | $ 825,000
MSRs recorded at cost | 300,000 |  | 300,000 |  | 31,000 |  |  |
Changes due to fair value adjustments | 39,000 | 198,000 | (1,038,000) | 1,973,000 |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 813,000 |  | $ 813,000 |  | $ 1,431,000 |  |  |
Percent of OREO held at fair value | 90.00% |  | 90.00% |  | 51.00% |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | $ 735,000 |  | $ 735,000 |  | $ 735,000 |  |  |
OREO valuation adjustments |  | 115,000 | 0 | 80,000 |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 5,700,000 |  | 5,700,000 |  | 6,200,000 |  |  |
Alternative Investment, income recognized | 513,000 | $ 1,300,000 | 2,400,000 | $ (41,000) |  |  |  |
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 |  | 15,600,000 |  | 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 | 180,000 |  | 180,000 |  | 1,332,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 3,286,000 |  | 3,286,000 |  | 4,102,000 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 848,000 |  | $ 848,000 |  | $ 6,924,000 |  |  |

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