Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2023

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Schedule of actual and required capital amounts and ratios

The following table shows the actual and required capital amounts and ratios for 1st Source Corporation and 1st Source Bank as of December 31, 2023 and 2022.

	Actual				Minimum Capital Adequacy				Minimum Capital Adequacy with Capital Buffer				To Be Well Capitalized Under Prompt Corrective Action Provisions
(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
2023
Total Capital (to Risk-Weighted Assets):
1st Source Corporation	$	1,248,905	16.25	%	$	614,880	8.00	%	$	807,031	10.50	%	$	768,601	10.00	%
1st Source Bank	1,168,672		15.21		614,547		8.00		806,593		10.50		768,184		10.00
Tier 1 Capital (to Risk-Weighted Assets):
1st Source Corporation	1,152,093		14.99		461,160		6.00		653,311		8.50		614,880		8.00
1st Source Bank	1,071,912		13.95		460,910		6.00		652,956		8.50		614,547		8.00
Common Equity Tier 1 Capital (to Risk-Weighted Assets):
1st Source Corporation	1,016,398		13.22		345,870		4.50		538,020		7.00		499,590		6.50
1st Source Bank	993,217		12.93		345,683		4.50		537,729		7.00		499,319		6.50
Tier 1 Capital (to Average Assets):
1st Source Corporation	1,152,093		13.26		347,512		4.00		N/A		N/A		434,390		5.00
1st Source Bank	1,071,912		12.34		347,397		4.00		N/A		N/A		434,246		5.00
2022
Total Capital (to Risk-Weighted Assets):
1st Source Corporation	$	1,137,984	16.10	%	$	565,314	8.00	%	$	741,975	10.50	%	$	706,643	10.00	%
1st Source Bank	1,060,292		15.01		565,119		8.00		741,718		10.50		706,398		10.00
Tier 1 Capital (to Risk-Weighted Assets):
1st Source Corporation	1,048,955		14.84		423,986		6.00		600,647		8.50		565,314		8.00
1st Source Bank	971,294		13.75		423,839		6.00		600,439		8.50		565,119		8.00
Common Equity Tier 1 Capital (to Risk-Weighted Assets):
1st Source Corporation	932,257		13.19		317,989		4.50		494,650		7.00		459,318		6.50
1st Source Bank	911,596		12.90		317,879		4.50		494,479		7.00		459,159		6.50
Tier 1 Capital (to Average Assets):
1st Source Corporation	1,048,955		12.63		332,287		4.00		N/A		N/A		415,359		5.00
1st Source Bank	971,294		11.70		332,125		4.00		N/A		N/A		415,156		5.00