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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 7,783,556,000 |  | $ 7,783,556,000 |  | $ 7,594,692,000 |  |  |
Alternative Investment | 52,122,000 |  | 52,122,000 |  | 50,142,000 |  |  |
Loans Held-for-sale, Fair Value Disclosure | 3,451,000 |  | 3,451,000 |  | 5,550,000 |  |  |
Impaired Financing Receivable, Carrying Value | 69,838,000 |  | $ 69,838,000 |  | 51,850,000 |  |  |
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 |  |  | $ 3,127,000 |  | 5,009,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,580,000 |  | 2,580,000 |  | 1,299,000 |  |  |
Impaired Loan Fair Value | 1,072,000 |  | 1,072,000 |  | 2,946,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 165,000 |  | 488,000 |  |  |
Book Value Of Impaired Loans Carried At Fair Value | 1,196,000 |  | 1,196,000 |  | 2,986,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | 124,000 | $ 14,000 | 76,000 | $ 71,000 |  |  |  |
MSR recorded at lower of cost or fair value | 13,667,000 | 14,063,000 | 13,667,000 | 14,063,000 | 13,918,000 | $ 13,729,000 | $ 14,271,000 | $ 14,656,000
Mortgage Servicing Rights Fair Value | 100,000 |  | 100,000 |  | 400,000 |  |  |
Valuation allowance of MSR | 5,000 | 28,000 | 5,000 | 28,000 | 19,000 | $ 23,000 | $ 28,000 | $ 94,000
MSRs recorded at cost | 13,600,000 |  | 13,600,000 |  | 13,500,000 |  |  |
Changes due to fair value adjustments | (18,000) | 0 | (14,000) | (66,000) |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 638,000 |  | 638,000 |  | 938,000 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 13,000,000.0 |  | 13,000,000.0 |  | $ 17,600,000 |  |  |
Alternative Investment, income recognized | 1,100,000 | $ 857,000 | 1,000,000.0 | $ 75,000 |  |  |  |
Other Real Estate, Valuation Adjustments | $ 0 |  | $ 60,000 |  |  |  |  |
Credit Spread Assumption | 3.67% |  | 3.67% |  | 3.67% |  |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Alternative Investment | $ 39,100,000 |  | $ 39,100,000 |  | $ 32,600,000 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 7,779,974,000 |  | 7,779,974,000 |  | 7,589,057,000 |  |  |
Impaired Loan Fair Value | 1,072,000 |  | 1,072,000 |  | 2,946,000 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 1,072,000 |  | 1,072,000 |  | 2,946,000 |  |  |
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 | 1,072,000 |  | 1,072,000 |  | 2,946,000 |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 0 |  | $ 0 |  | $ 938,000 |  |  |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482134/820-10-35-54B Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A + Details
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