Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2025 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Brian Hamilton, Plan 1 [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On September 15, 2025, Brian Hamilton, CCBX President, adopted a Rule 10b5-1 trading arrangement, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c), for the planned sell-to-cover of common stock for tax withholding purposes for any vesting events that occur while this plan is in effect, subject to certain conditions. The arrangement will terminate on the earlier of (a) January 1, 2027, (b) the 2nd business day after Mr. Hamilton, or Broker, notifies the other in writing that it shall terminate, or (c) subject to certain conditions.
Name	Brian Hamilton
Title	CCBX President
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 15, 2025
Expiration Date	January 1, 2027
Arrangement Duration	473 days
Brian Hamilton, Plan 2 [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On September 15, 2025, Brian Hamilton, CCBX President, adopted a Rule 10b5-1 trading arrangement, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c), for the potential sale of up to 10,079 shares of common stock, subject to certain conditions. The arrangement will terminate on the earlier of (a) January 1, 2027, (b) the 2nd business day after Mr. Hamilton, or Broker, notifies the other in writing that it shall terminate, or (c) subject to certain conditions.
Name	Brian Hamilton
Title	CCBX Presiden
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 15, 2025
Expiration Date	January 1, 2027
Arrangement Duration	473 days
Aggregate Available	10,079

COASTAL FINANCIAL CORP 10-Q