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Regulatory Matters (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Total Capital (to Risk-Weighted Assets):    
Actual Amount $ 1,034,605 $ 966,092
Actual Ratio (as a percent) 0.1676 0.1599
Minimum Capital Adequacy Amount $ 493,751 $ 483,350
Minimum Capital Adequacy Ratio (as a percent) 0.0800 0.0800
Minimum Capital Adequacy with Capital Buffer Amount $ 648,048 $ 634,397
Minimum Capital Adequacy with Capital Buffer Ratio (as a percent) 0.1050 0.1050
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 617,189 $ 604,188
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier I Capital (to Risk-Weighted Assets):    
Actual Amount $ 956,783 $ 889,709
Actual Ratio (as a percent) 0.1550 0.1473
Minimum Capital Adequacy Amount $ 370,313 $ 362,513
Minimum Capital Adequacy Ratio (as a percent) 0.0600 0.0600
Minimum Capital Adequacy with Capital Buffer Amount $ 524,611 $ 513,560
Minimum Capital Adequacy with Capital Buffer Ratio (as a percent) 0.0850 0.0850
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 493,751 $ 483,350
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Common Equity Tier 1 Capital (to Risk-Weighted Assets):    
Actual Amount $ 846,573 $ 788,884
Actual Ratio (as a percent) 0.1372 0.1306
Minimum Capital Adequacy Amount $ 277,735 $ 271,884
Minimum Capital Adequacy Ratio (as a percent) 0.0450 0.0450
Minimum Capital Adequacy with Capital Buffer Amount $ 432,032 $ 422,931
Minimum Capital Adequacy with Capital Buffer Ratio (as a percent) 0.0700 0.0700
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 401,173 $ 392,722
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0650 0.0650
Tier I Capital (to Average Assets):    
Actual Amount $ 956,783 $ 889,709
Actual Ratio (as a percent) 0.1189 0.1215
Minimum Capital Adequacy Amount $ 321,925 $ 292,977
Minimum Capital Adequacy Ratio (as a percent) 0.0400 0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 402,407 $ 366,221
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500
1st Source Bank    
Total Capital (to Risk-Weighted Assets):    
Actual Amount $ 969,228 $ 881,983
Actual Ratio (as a percent) 0.1571 0.1459
Minimum Capital Adequacy Amount $ 493,412 $ 483,637
Minimum Capital Adequacy Ratio (as a percent) 0.0800 0.0800
Minimum Capital Adequacy with Capital Buffer Amount $ 647,603 $ 634,774
Minimum Capital Adequacy with Capital Buffer Ratio (as a percent) 0.1050 0.1050
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 616,765 $ 604,546
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier I Capital (to Risk-Weighted Assets):    
Actual Amount $ 891,458 $ 805,556
Actual Ratio (as a percent) 0.1445 0.1332
Minimum Capital Adequacy Amount $ 370,059 $ 362,728
Minimum Capital Adequacy Ratio (as a percent) 0.0600 0.0600
Minimum Capital Adequacy with Capital Buffer Amount $ 524,250 $ 513,864
Minimum Capital Adequacy with Capital Buffer Ratio (as a percent) 0.0850 0.0850
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 493,412 $ 483,637
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Common Equity Tier 1 Capital (to Risk-Weighted Assets):    
Actual Amount $ 838,248 $ 761,731
Actual Ratio (as a percent) 0.1359 0.1260
Minimum Capital Adequacy Amount $ 277,544 $ 272,046
Minimum Capital Adequacy Ratio (as a percent) 0.0450 0.0450
Minimum Capital Adequacy with Capital Buffer Amount $ 431,735 $ 423,182
Minimum Capital Adequacy with Capital Buffer Ratio (as a percent) 0.0700 0.0700
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 400,897 $ 392,955
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0650 0.0650
Tier I Capital (to Average Assets):    
Actual Amount $ 891,458 $ 805,556
Actual Ratio (as a percent) 0.1108 0.1100
Minimum Capital Adequacy Amount $ 321,821 $ 292,959
Minimum Capital Adequacy Ratio (as a percent) 0.0400 0.0400
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 402,277 $ 366,199
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500