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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 7,235,549,000 |  | $ 7,235,549,000 |  | $ 6,441,458,000 |  |  |
expense related to other repossessed assets |  |  | 207,000 | $ 0 |  |  |  |
Alternative Investment | 20,979,000 |  | 20,979,000 |  | 20,411,000 |  |  |
Loans Held-for-sale, Fair Value Disclosure | 48,265,000 |  | 48,265,000 |  | 12,278,000 |  |  |
Impaired Financing Receivable, Carrying Value | 107,514,000 |  | $ 107,514,000 |  | 72,261,000 |  |  |
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 |  |  | $ 563,000 |  | 719,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 8,666,000 |  | 8,666,000 |  | 5,230,000 |  |  |
Impaired Financing Receivable, Related Allowance | 8,666,000 |  | 8,666,000 |  | 5,230,000 |  |  |
Impaired Loan Fair Value | 16,226,000 |  | 16,226,000 |  | 2,090,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 247,000 |  | 313,000 |  |  |
Book Value Of Impaired Loans Carried At Fair Value | 19,395,000 |  | 19,395,000 |  | 2,167,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | 3,100,000 | $ 135,000 | 3,500,000 | 174,000 |  |  |  |
MSR recorded at lower of cost or fair value | 11,040,000 | 9,960,000 | 11,040,000 | 9,960,000 | 10,070,000 | $ 9,505,000 | $ 10,104,000 | $ 10,178,000
Mortgage Servicing Rights Fair Value | 11,000,000.0 |  | 11,000,000.0 |  | 5,800,000 |  |  |
Valuation allowance of MSR | 2,798,000 | 653,000 | 2,798,000 | 653,000 | 825,000 | $ 2,600,000 | $ 321,000 | $ 232,000
MSRs recorded at cost | 11,000 |  | 11,000 |  | 4,300,000 |  |  |
Changes due to fair value adjustments | (198,000) | (332,000) | (1,973,000) | (421,000) |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 836,000 |  | $ 836,000 |  | $ 4,029,000 |  |  |
Percent of OREO held at fair value | 92.00% |  | 92.00% |  | 75.00% |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value | $ 767,000 |  | $ 767,000 |  | $ 3,000,000.0 |  |  |
OREO valuation adjustments | 115,000 | (41,000) | 80,000 | (123,000) |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 7,000,000.0 |  | 7,000,000.0 |  | 8,500,000 |  |  |
Alternative Investment, income recognized | 1,300,000 | $ 3,300,000 | (41,000) | $ 5,100,000 |  |  |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Alternative Investment | 14,000,000.0 |  | 14,000,000.0 |  | 11,900,000 |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 3,169,000 |  | 3,169,000 |  | 77,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 5,497,000 |  | 5,497,000 |  | 5,153,000 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 16,226,000 |  | $ 16,226,000 |  | $ 2,090,000 |  |  |

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