Investment Securities (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| Investments, Debt and Equity Securities [Abstract] |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The amortized cost and fair value of securities available for sale as of September 30, 2026, by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity. Expected maturities may differ from contractual maturities for collateralized mortgage obligations and mortgage-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Therefore, collateralized mortgage obligations and mortgage-backed securities are not included in the maturity categories within the following maturity summary. | | | | | | | | | | | | | September 30, 2026 | | Amortized Cost | | Fair Value | | | | | | Due after one year through five years | $ | 5,750 | | | $ | 5,519 | | | Due after five years through ten years | 26,558 | | | 22,170 | | | Due after ten years | 173,763 | | | 131,798 | | | 206,071 | | | 159,487 | | | Collateralized mortgage obligations and mortgage-backed securities | 327,752 | | | 256,161 | | | $ | 533,823 | | | $ | 415,648 | |
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| Schedule of Realized Gain (Loss) [Table Text Block] |
There were no sales of securities available for sale during the three and nine months ended September 30, 2026 and 2025.
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| Unrealized Gain (Loss) on Investments [Table Text Block] |
The following tables show the amortized cost, gross unrealized gains and losses, and fair value of securities available for sale, by security type as of September 30, 2026 and December 31, 2025. | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2026 | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
(Losses) | | Fair
Value | | Securities available for sale: | | | | | | | | | State and political subdivisions | $ | 196,321 | | | $ | 1 | | | $ | (46,159) | | | $ | 150,163 | | Collateralized mortgage obligations (1) | 220,957 | | | — | | | (50,048) | | | 170,909 | | Mortgage-backed securities (1) | 106,795 | | | — | | | (21,543) | | | 85,252 | | | Corporate notes | 9,750 | | | — | | | (426) | | | 9,324 | | | $ | 533,823 | | | $ | 1 | | | $ | (118,176) | | | $ | 415,648 | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
(Losses) | | Fair
Value | | Securities available for sale: | | | | | | | | | State and political subdivisions | $ | 198,083 | | | $ | 1 | | | $ | (34,820) | | | $ | 163,264 | | Collateralized mortgage obligations (1) | 234,217 | | | — | | | (40,534) | | | 193,683 | | Mortgage-backed securities (1) | 113,358 | | | — | | | (17,216) | | | 96,142 | | | Collateralized loan obligations | 2,307 | | | 1 | | | (1) | | | 2,307 | | | Corporate notes | 13,750 | | | — | | | (699) | | | 13,051 | | | $ | 561,715 | | | $ | 2 | | | $ | (93,270) | | | $ | 468,447 | |
(1)Collateralized mortgage obligations and mortgage-backed securities consist of residential and commercial mortgage pass-through securities and collateralized mortgage obligations guaranteed by FNMA, FHLMC, GNMA and SBA.
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| Schedule of Unrealized Loss on Investments Table Text Block |
The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of September 30, 2026 and December 31, 2025.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2026 | | Less than 12 months | | 12 months or longer | | Total | | Fair
Value | | Gross
Unrealized
(Losses) | | No. of Securities | | Fair
Value | | Gross
Unrealized
(Losses) | | No. of Securities | | Fair
Value | | Gross
Unrealized
(Losses) | | Securities available for sale: | | | | | | | | | | | | | | | | | State and political | | | | | | | | | | | | | | | | | subdivisions | $ | — | | | $ | — | | | — | | $ | 150,073 | | | $ | (46,159) | | | 68 | | $ | 150,073 | | | $ | (46,159) | | | Collateralized mortgage | | | | | | | | | | | | | | | | | obligations | 1,919 | | | (32) | | | 1 | | 167,005 | | | (50,016) | | | 53 | | 168,924 | | | (50,048) | | | Mortgage-backed securities | — | | | — | | | — | | 85,252 | | | (21,543) | | | 22 | | 85,252 | | | (21,543) | | | Corporate notes | — | | | — | | | — | | 9,324 | | | (426) | | | 6 | | 9,324 | | | (426) | | | $ | 1,919 | | | $ | (32) | | | 1 | | $ | 411,654 | | | $ | (118,144) | | | 149 | | $ | 413,573 | | | $ | (118,176) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Less than 12 months | | 12 months or longer | | Total | | Fair
Value | | Gross
Unrealized
(Losses) | | No. of Securities | | Fair
Value | | Gross
Unrealized
(Losses) | | No. of Securities | | Fair
Value | | Gross
Unrealized
(Losses) | | Securities available for sale: | | | | | | | | | | | | | | | | | State and political | | | | | | | | | | | | | | | | | subdivisions | $ | — | | | $ | — | | | — | | $ | 163,173 | | | $ | (34,820) | | | 68 | | $ | 163,173 | | | $ | (34,820) | | | Collateralized mortgage | | | | | | | | | | | | | | | | | obligations | — | | | — | | | — | | 193,683 | | | (40,534) | | | 53 | | 193,683 | | | (40,534) | | | Mortgage-backed securities | — | | | — | | | — | | 96,142 | | | (17,216) | | | 22 | | 96,142 | | | (17,216) | | | Collateralized loan obligations | 1,110 | | | (1) | | | 1 | | — | | | — | | | — | | 1,110 | | | (1) | | | Corporate notes | — | | | — | | | — | | 13,052 | | | (699) | | | 8 | | 13,052 | | | (699) | | | $ | 1,110 | | | $ | (1) | | | 1 | | $ | 466,050 | | | $ | (93,269) | | | 151 | | $ | 467,160 | | | $ | (93,270) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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