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Investment Securities - Summary of Held-to-maturity Securities by Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Schedule of Held-to-maturity Securities [Line Items] |  |
Debt securities, maturing within 1 year, amortized cost | $ 7,763 |
Debt securities, maturing 1 to 5 years, amortized cost | 21,110 |
Debt securities, maturing 5 to 10 years, amortized cost | 190,352 |
Debt securities, maturing over 10 years, amortized cost | 712,836 |
Amortized Cost | 932,061 | $ 775,037
Debt securities, maturing within 1 year, fair value | 7,728 |
Debt securities, maturing 1 to 5 years, fair value | 20,044 |
Debt securities, maturing 5 to 10 years, fair value | 180,012 |
Debt securities, maturing over 10 years, fair value | 664,941 |
Debt securities, held-to-maturity, fair value | $ 872,725 | 692,499
Held-to-maturity securities, maturing within 1 year, weighted average yield | 1.90% |
Held-to-maturity securities, maturing 1 to 5 years, weighted average yield | 1.93% |
Held-to-maturity securities, maturing 6 to 10 years, weighted average yield | 3.93% |
Held-to-maturity securities, maturing over 10 years, weighted average yield | 4.21% |
Held-to-maturity securities, total weighted average yield | 4.08% |
U.S. government sponsored agencies |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt securities, maturing within 1 year, amortized cost | $ 2,916 |
Debt securities, maturing 1 to 5 years, amortized cost | 5,693 |
Debt securities, maturing 5 to 10 years, amortized cost | 119,659 |
Debt securities, maturing over 10 years, amortized cost | 127,620 |
Amortized Cost | 255,888 | 233,302
Debt securities, maturing within 1 year, fair value | 2,881 |
Debt securities, maturing 1 to 5 years, fair value | 5,412 |
Debt securities, maturing 5 to 10 years, fair value | 118,768 |
Debt securities, maturing over 10 years, fair value | 121,415 |
Debt securities, held-to-maturity, fair value | 248,476 | 223,294
States and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt securities, maturing within 1 year, amortized cost | 2,799 |
Debt securities, maturing 1 to 5 years, amortized cost | 6,581 |
Debt securities, maturing 5 to 10 years, amortized cost | 27,522 |
Debt securities, maturing over 10 years, amortized cost | 105,204 |
Amortized Cost | 142,106 | 142,691
Debt securities, maturing within 1 year, fair value | 2,799 |
Debt securities, maturing 1 to 5 years, fair value | 6,375 |
Debt securities, maturing 5 to 10 years, fair value | 23,182 |
Debt securities, maturing over 10 years, fair value | 83,092 |
Debt securities, held-to-maturity, fair value | 115,448 | 110,848
Residential mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt securities, maturing within 1 year, amortized cost | 48 |
Debt securities, maturing 1 to 5 years, amortized cost | 0 |
Debt securities, maturing 5 to 10 years, amortized cost | 3,594 |
Debt securities, maturing over 10 years, amortized cost | 434,459 |
Amortized Cost | 438,101 | 300,290
Debt securities, maturing within 1 year, fair value | 48 |
Debt securities, maturing 1 to 5 years, fair value | 0 |
Debt securities, maturing 5 to 10 years, fair value | 3,247 |
Debt securities, maturing over 10 years, fair value | 422,613 |
Debt securities, held-to-maturity, fair value | 425,908 | 276,278
Commercial mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt securities, maturing within 1 year, amortized cost | 2,000 |
Debt securities, maturing 1 to 5 years, amortized cost | 8,836 |
Debt securities, maturing 5 to 10 years, amortized cost | 39,577 |
Debt securities, maturing over 10 years, amortized cost | 45,553 |
Amortized Cost | 95,966 | 98,754
Debt securities, maturing within 1 year, fair value | 2,000 |
Debt securities, maturing 1 to 5 years, fair value | 8,257 |
Debt securities, maturing 5 to 10 years, fair value | 34,815 |
Debt securities, maturing over 10 years, fair value | 37,821 |
Debt securities, held-to-maturity, fair value | $ 82,893 | $ 82,079

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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3 + Details
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- Definition Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3 + Details
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