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Securities
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Securities Securities
The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale and held-to-maturity debt securities by type follows as of December 31,:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
 Fair
 Value
2023
Available-for-sale:
U.S. treasury$58,468 $— $(4,234)$54,234 
U.S. agency1,872 — (33)1,839 
Obligations of states and political subdivisions29,979 — (4,009)25,970 
Mortgage backed - residential121,288 119 (14,974)106,433 
Collateralized mortgage obligations203,394 — (21,861)181,533 
Mortgage backed - commercial145,062 497 (14,367)131,192 
Other debt16,792 — (1,236)15,556 
Total available-for-sale$576,855 $616 $(60,714)$516,757 
Held-to-maturity:
Obligations of states and political subdivisions$25,542 $3 $(3,987)$21,558 
Mortgage backed - residential7,548 2 (560)6,990 
Collateralized mortgage obligations3,893 — (260)3,633 
Total held-to-maturity$36,983 $5 $(4,807)$32,181 
2022
Available-for-sale:
U.S. treasury62,010 — (5,361)56,649 
U.S. agency$2,881 $— $(47)$2,834 
Obligations of states and political subdivisions29,897 — (4,998)24,899 
Mortgage backed - residential129,955 6 (13,826)116,135 
Collateralized mortgage obligations225,559 — (21,294)204,265 
Mortgage backed - commercial130,997 — (13,661)117,336 
Other debt16,774 — (1,919)14,855 
Total available-for-sale$598,073 $6 $(61,106)$536,973 
Held-to-maturity:
Obligations of states and political subdivisions25,378 5 (4,891)20,492 
Mortgage backed - residential8,705 4 (511)8,198 
Collateralized mortgage obligations4,818 — (290)4,528 
Total held-to-maturity$38,901 $9 $(5,692)$33,218 
There was no allowance for credit losses related to our investment securities as of December 31, 2023.
As of December 31, 2023 and 2022, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.
Fair value and unrealized losses on debt securities by type and length of time in a continuous unrealized loss position without an allowance for credit losses were as follows as of December 31,:
Less than 12 months12 months or longerTotal
Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Number
of
Securities
2023
Available-for-sale:
U.S. treasury$— $— $54,234 $(4,234)$54,234 $(4,234)9 
U.S. agency— — 1,839 (33)1,839 (33)7 
Obligations of states and political subdivisions— — 25,970 (4,009)25,970 (4,009)19 
Mortgage backed - residential— — 100,571 (14,974)100,571 (14,974)83 
Collateralized mortgage obligations— — 181,533 (21,861)181,533 (21,861)65 
Mortgage backed - commercial4,721 (27)114,625 (14,340)119,346 (14,367)24 
Other debt— — 15,556 (1,236)15,556 (1,236)9 
Total available-for-sale$4,721 $(27)$494,328 $(60,687)$499,049 $(60,714)216 
Held-to-maturity:
Obligations of states and political subdivisions$— $— $21,223 $(3,987)$21,223 $(3,987)8
Mortgage backed - residential— — 6,845 (560)6,845 (560)10
Collateralized mortgage obligations— — 3,633 (260)3,633 (260)5
Total held-to-maturity$— $— $31,701 $(4,807)$31,701 $(4,807)23
Less than 12 months12 months or longerTotal
Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Estimated
Fair
Value		Unrealized
Losses		Number
of
Securities
2022
Available-for-sale:
U.S. treasury$25,702 $(967)$30,947 $(4,394)$56,649 $(5,361)10
U.S. agency— — 2,834 (47)2,834 (47)7 
Obligations of states and political subdivisions21,676 (3,784)2,753 (1,214)24,429 (4,998)18 
Mortgage backed - residential51,921 (2,939)63,691 (10,887)115,612 (13,826)87 
Collateralized mortgage obligations111,360 (4,631)92,905 (16,663)204,265 (21,294)66 
Mortgage backed - commercial70,710 (6,475)46,626 (7,186)117,336 (13,661)22 
Other debt14,855 (1,919)— — 14,855 (1,919)9 
Total available-for-sale$296,224 $(20,715)$239,756 $(40,391)$535,980 $(61,106)219 
Held-to-maturity:
Obligations of states and political subdivisions$20,153 $(4,891)$— $— $20,153 $(4,891)8
Mortgage backed - residential7,993 (511)— — 7,993 (511)10
Collateralized mortgage obligations4,127 (275)401 (15)4,528 (290)5
Total held-to-maturity$32,273 $(5,677)$401 $(15)$32,674 $(5,692)23
We do not consider the unrealized losses to be credit-related, as these unrealized losses primarily relate to changes in interest rates and market spreads subsequent to purchase. We do not have plans to sell any of the available-for-sale debt securities with unrealized losses as of December 31, 2023, and we believe it is more likely than not that we would not be required to sell such available-for-sale debt securities before recovery of their amortized cost.
We continue to monitor unrealized loss positions for potential credit impairments. During the year ended December 31, 2023, there were no credit impairments related to our investment securities.
The amortized cost and fair value of our debt securities by contractual maturity as of December 31, 2023 are summarized in the following table. Maturities are based on the final contractual payment dates and do not reflect the impact of prepayments or earlier redemptions that may occur.
Amortized
Cost		Estimated
Fair
Value
Available-for-sale:
Due within 1 year$23,215 $22,802 
Due after 1 year through 5 years55,359 50,882 
Due after 5 years through 10 years152,454 138,464 
Due after 10 years345,827 304,609 
Total available-for-sale$576,855 $516,757 
Held-to-maturity:
Due after 1 year through 5 years$988 $963 
Due after 5 years through 10 years737 713 
Due after 10 years35,258 30,505 
Total held-to-maturity$36,983 $32,181 
Securities with a carrying value of $468,679 and $428,721 were pledged to secure public deposits, securities sold under agreements to repurchase and borrowed funds at December 31, 2023 and 2022, respectively.
There were no proceeds from sales and calls of securities for the year ended December 31, 2023. There were proceeds from sales and calls of securities of $81,016 for the year ended December 31, 2022. For the years ended December 31, 2023, 2022 and 2021 there were no gross investment gains or losses resulting from the sale of securities.