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Investment securities (Notes)
 12 Months Ended
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Investments in Debt and Marketable Equity Securities Disclosure [Text Block] Securities Available for Sale
 
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 December 31, 2025 and 2024. 
 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 obligations2,307 1 (1)2,307 
Corporate notes13,750 — (699)13,051 
 $561,715 $2 $(93,270)$468,447 
 2024
 Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Securities available for sale:
State and political subdivisions$215,942 $— $(41,797)$174,145 
Collateralized mortgage obligations (1)
278,754 — (59,490)219,264 
Mortgage-backed securities (1)
145,992 — (26,173)119,819 
Collateralized loan obligations18,932 33 — 18,965 
Corporate notes13,750 — (1,378)12,372 
 $673,370 $33 $(128,838)$544,565 

(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.

Securities with a fair value of approximately $418,670 and $455,825 as of December 31, 2025 and 2024, respectively, were pledged as collateral for borrowings and public fund deposits, and for other purposes as required or permitted by law or regulation.

The amortized cost and fair value of securities available for sale as of December 31, 2025, 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.
 2025
 Amortized CostFair Value
Due after five years through ten years$30,902 $28,227 
Due after ten years183,238 150,395 
 214,140 178,622 
Collateralized mortgage obligations and mortgage-backed securities347,575 289,825 
 $561,715 $468,447 
The details of the sales of securities available for sale for the years ended December 31, 2025, 2024 and 2023 are summarized in the following table.
 202520242023
Proceeds from sales$63,690 $11,841 $11,285 
Gross gains on sales3 — — 
Gross losses on sales3,962 1,172 431 
The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of December 31, 2025 and 2024.  
 2025
 Less than 12 months12 months or longerTotal
 Fair
Value		Gross Unrealized
Losses		No. of SecuritiesFair
Value		Gross Unrealized
Losses		No. of SecuritiesFair
Value		Gross Unrealized
Losses
Securities available for sale:
State and political subdivisions$— $— — $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 obligations1,110 (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)
 2024
 Less than 12 months12 months or longerTotal
 Fair
Value		Gross Unrealized
Losses		No. of SecuritiesFair
Value		Gross Unrealized
Losses		No. of SecuritiesFair
Value		Gross Unrealized
Losses
Securities available for sale:
State and political subdivisions$4,485 $(271)7$169,650 $(41,526)90$174,135 $(41,797)
Collateralized mortgage obligations— — — 219,264 (59,490)69219,264 (59,490)
Mortgage-backed securities610 (3)1119,209 (26,170)25119,819 (26,173)
   Corporate notes— — — 12,372 (1,378)812,372 (1,378)
 $5,095 $(274)8$520,495 $(128,564)192$525,590 $(128,838)
If the Company intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis, then the security is written down to fair value through income. As of December 31, 2025 and December 31, 2024, the Company did not have the intent to sell, nor was it more likely than not that we would be required to sell any of the securities in an unrealized loss position prior to recovery. As of December 31, 2025 and December 31, 2024, the Company also determined that no individual securities in an unrealized loss position represented credit losses that would require an allowance for credit losses. The Company concluded that the unrealized losses were primarily attributable to increases in market interest rates since these securities were purchased and other market conditions. Accrued interest receivable is not included in available-for-sale security balances and is presented in the “Accrued interest receivable” line of the Consolidated Balance Sheets. Interest receivable on securities was $2,354 and $2,842 as of December 31, 2025 and December 31, 2024, respectively, and was excluded from the estimate of credit losses.