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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 7,406,168,000 |  | $ 7,406,168,000 |  | $ 7,206,670,000 |  |  |
Alternative Investment | 48,161,000 |  | 48,161,000 |  | 45,885,000 |  |  |
Loans Held-for-sale, Fair Value Disclosure | 4,309,000 |  | 4,309,000 |  | 3,235,000 |  |  |
Impaired Financing Receivable, Carrying Value | 49,682,000 |  | $ 49,682,000 |  | 40,232,000 |  |  |
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 |  |  | $ 2,191,000 |  | 2,349,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 5,311,000 |  | 5,311,000 |  | 4,983,000 |  |  |
Impaired Loan Fair Value | 2,269,000 |  | 2,269,000 |  | 2,497,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 1,948,000 |  | 2,048,000 |  |  |
Book Value Of Impaired Loans Carried At Fair Value | 2,327,000 |  | 2,327,000 |  | 2,499,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | 23,000 | $ 551,000 | 58,000 | $ 658,000 |  |  |  |
MSR recorded at lower of cost or fair value | 14,271,000 | 15,237,000 | 14,271,000 | 15,237,000 | 14,656,000 | $ 14,435,000 | $ 15,505,000 | $ 15,792,000
Mortgage Servicing Rights Fair Value | 500,000 |  | 500,000 |  | 900,000 |  |  |
Valuation allowance of MSR | 28,000 | 101,000 | 28,000 | 101,000 | 94,000 | $ 69,000 | $ 168,000 | $ 182,000
MSRs recorded at cost | 13,800,000 |  | 13,800,000 |  | 13,800,000 |  |  |
Changes due to fair value adjustments | (41,000) | (67,000) | (66,000) | (81,000) |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 1,210,000 |  | 1,210,000 |  | 983,000 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 20,100,000 |  | 20,100,000 |  | 18,400,000 |  |  |
Alternative Investment, income recognized | (92,000) | $ 137,000 | (782,000) | (241,000) |  |  |  |
Other Real Estate, Valuation Adjustments |  |  | 0 | $ 77,000 |  |  |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Alternative Investment | 28,000,000.0 |  | 28,000,000.0 |  | 27,500,000 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 7,401,757,000 |  | 7,401,757,000 |  | 7,203,348,000 |  |  |
Impaired Loan Fair Value | 2,269,000 |  | 2,269,000 |  | 2,497,000 |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 58,000 |  | 58,000 |  | 2,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 5,253,000 |  | 5,253,000 |  | 4,981,000 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 2,269,000 |  | 2,269,000 |  | 2,497,000 |  |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 2,269,000 |  | 2,269,000 |  | 2,497,000 |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 938,000 |  | $ 938,000 |  | $ 938,000 |  |  |

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