XML 52 R36.htm IDEA: XBRL DOCUMENT
v3.25.4

INVESTMENT SECURITIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity | The amortized cost and estimated fair value of securities available-for-sale and held-to-maturity, along with gross unrealized gains and losses are summarized as follows:
(dollars in thousands) |  |  |  |  |  |  |
December 31, 2025 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Available-for-Sale: |  |  |  |  |  |  |
U.S. treasury securities | $ | 5,570 |  |  | $ | 12 |  |  | $ | — |  |  | $ | 5,582 |
U.S. agency securities | 3,304 |  |  | — |  |  | (108) |  |  | 3,196 |
Asset backed securities | 14,622 |  |  | 6 |  |  | (145) |  |  | 14,483 |
State, county & municipal securities | 118,204 |  |  | 58 |  |  | (11,032) |  |  | 107,230 |
Corporate debt securities | 52,660 |  |  | 336 |  |  | (4,189) |  |  | 48,807 |
Mortgage-backed securities | 218,035 |  |  | 525 |  |  | (14,041) |  |  | 204,519 |
Total | $ | 412,395 |  |  | $ | 937 |  |  | $ | (29,515) |  |  | $ | 383,817 |
December 31, 2025 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Held-to-Maturity: |  |  |  |  |  |  |
U.S. treasury securities | $ | 65,408 |  |  | $ | — |  |  | $ | (958) |  |  | $ | 64,450 |
U.S. agency securities | 8,991 |  |  | — |  |  | (682) |  |  | 8,309 |
State, county & municipal securities | 137,591 |  |  | 76 |  |  | (11,675) |  |  | 125,992 |
Mortgage-backed securities | 174,628 |  |  | — |  |  | (19,089) |  |  | 155,539 |
Total | $ | 386,618 |  |  | $ | 76 |  |  | $ | (32,404) |  |  | $ | 354,290 |
December 31, 2024 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Available-for-Sale: |  |  |  |  |  |  |
U.S. treasury securities | $ | 3,173 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,173 |
U.S. agency securities | 3,001 |  |  | — |  |  | (246) |  |  | 2,755 |
Asset backed securities | 17,925 |  |  | 17 |  |  | (118) |  |  | 17,824 |
State, county & municipal securities | 110,952 |  |  | — |  |  | (15,315) |  |  | 95,637 |
Corporate debt securities | 53,324 |  |  | 1 |  |  | (5,543) |  |  | 47,782 |
Mortgage-backed securities | 221,005 |  |  | 207 |  |  | (22,334) |  |  | 198,878 |
Total | $ | 409,380 |  |  | $ | 225 |  |  | $ | (43,556) |  |  | $ | 366,049 |
December 31, 2024 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Held-to-Maturity: |  |  |  |  |  |  |
U.S. treasury securities | $ | 91,004 |  |  | $ | — |  |  | $ | (2,828) |  |  | $ | 88,176 |
U.S. agency securities | 16,151 |  |  | — |  |  | (1,263) |  |  | 14,888 |
State, county & municipal securities | 137,190 |  |  | — |  |  | (15,915) |  |  | 121,275 |
Mortgage-backed securities | 185,732 |  |  | — |  |  | (27,051) |  |  | 158,681 |
Total | $ | 430,077 |  |  | $ | — |  |  | $ | (47,057) |  |  | $ | 383,020 |
Schedule Of Securities in a Continuous Loss Position | Information pertaining to available-for-sale securities with gross unrealized losses at December 31, 2025 and December 31, 2024 aggregated by investment category and length of time that securities have been in a continuous unrealized loss position are summarized as follows:
| Less Than 12 Months |  | 12 Months or More |  | Total
(dollars in thousands) | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. agency securities | 1,182 |  |  | (2) |  |  | 2,014 |  |  | (106) |  |  | 3,196 |  |  | (108) |
Asset backed securities | 5,001 |  |  | (8) |  |  | 8,265 |  |  | (137) |  |  | 13,266 |  |  | (145) |
State, county & municipal securities | 5,219 |  |  | (545) |  |  | 94,080 |  |  | (10,487) |  |  | 99,299 |  |  | (11,032) |
Corporate debt securities | 3,955 |  |  | (45) |  |  | 34,550 |  |  | (4,144) |  |  | 38,505 |  |  | (4,189) |
Mortgage-backed securities | 27,089 |  |  | (134) |  |  | 125,920 |  |  | (13,907) |  |  | 153,009 |  |  | (14,041) |
Total debt securities | $ | 42,446 |  |  | $ | (734) |  |  | $ | 264,829 |  |  | $ | (28,781) |  |  | $ | 307,275 |  |  | $ | (29,515) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities | — |  |  | — |  |  | 2,755 |  |  | (246) |  |  | 2,755 |  |  | (246) |
Asset backed securities | 3,715 |  |  | (8) |  |  | 8,269 |  |  | (110) |  |  | 11,984 |  |  | $ | (118) |
State, county & municipal securities | 2,829 |  |  | (294) |  |  | 92,808 |  |  | (15,021) |  |  | 95,637 |  |  | $ | (15,315) |
Corporate debt securities | 4,434 |  |  | (720) |  |  | 42,847 |  |  | (4,823) |  |  | 47,281 |  |  | (5,543) |
Mortgage-backed securities | 21,278 |  |  | (430) |  |  | 160,343 |  |  | (21,904) |  |  | 181,621 |  |  | (22,334) |
Total debt securities | $ | 32,256 |  |  | $ | (1,452) |  |  | $ | 307,022 |  |  | $ | (42,104) |  |  | $ | 339,278 |  |  | $ | (43,556) |
Information pertaining to held-to-maturity securities with gross unrealized losses at December 31, 2025 and December 31, 2024 aggregated by investment category and length of time that individual securities have been in a continuous loss position is summarized as follows:
| Less Than 12 Months |  | 12 Months or Greater |  | Total
(dollars in thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
December 31, 2025 |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | — |  |  | $ | — |  |  | $ | 64,450 |  |  | $ | (958) |  |  | $ | 64,450 |  |  | $ | (958) |
U.S. agency securities | — |  |  | — |  |  | 8,309 |  |  | (682) |  |  | 8,309 |  |  | (682) |
State, county & municipal securities | 441 |  |  | (3) |  |  | 116,706 |  |  | (11,672) |  |  | 117,147 |  |  | (11,675) |
Mortgage-backed securities | — |  |  | — |  |  | 155,539 |  |  | (19,089) |  |  | 155,539 |  |  | (19,089) |
| $ | 441 |  |  | $ | (3) |  |  | $ | 345,004 |  |  | $ | (32,401) |  |  | $ | 345,445 |  |  | $ | (32,404) |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities | $ | — |  |  | $ | — |  |  | $ | 88,176 |  |  | $ | (2,828) |  |  | $ | 88,176 |  |  | $ | (2,828) |
U.S. agency securities | — |  |  | — |  |  | 14,888 |  |  | (1,263) |  |  | 14,888 |  |  | (1,263) |
State, county & municipal securities | 18,751 |  |  | (374) |  |  | 102,524 |  |  | (15,541) |  |  | 121,275 |  |  | (15,915) |
Mortgage-backed securities | — |  |  | — |  |  | 158,681 |  |  | (27,051) |  |  | 158,681 |  |  | (27,051) |
| $ | 18,751 |  |  | $ | (374) |  |  | $ | 364,269 |  |  | $ | (46,683) |  |  | $ | 383,020 |  |  | $ | (47,057) |
Schedule of Mortgage-Backed Securities | This is often the case with mortgage-backed securities, which are disclosed separately in the table below.
| Available-for-Sale |  | Held-to-Maturity
(dollars in thousands) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in one year or less | $ | 8,923 |  |  | $ | 8,742 |  |  | $ | 11,927 |  |  | $ | 11,918 |
Due after one year through five years | 36,863 |  |  | 35,478 |  |  | 64,760 |  |  | 63,478 |
Due after five years through ten years | 93,910 |  |  | 84,793 |  |  | 73,744 |  |  | 68,405 |
Due after ten years | 54,664 |  |  | 50,285 |  |  | 61,559 |  |  | 54,950 |
| $ | 194,360 |  |  | $ | 179,298 |  |  | $ | 211,990 |  |  | $ | 198,751 |
Mortgage-backed securities | 218,035 |  |  | 204,519 |  |  | 174,628 |  |  | 155,539 |
| $ | 412,395 |  |  | $ | 383,817 |  |  | $ | 386,618 |  |  | $ | 354,290 |

X
- Definition Schedule Of Securities In A Continuous Loss Position + References No definition available. + Details
Name: | cban_ScheduleOfSecuritiesInAContinuousLossPositionTableTextBlock
Namespace Prefix: | cban_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration