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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total Capital (to Risk-Weighted Assets):    
Actual Amount $ 764,853 $ 713,498
Actual Ratio (as a percent) 14.70% 15.12%
Minimum Capital Adequacy Amount $ 416,174 $ 377,432
Minimum Capital Adequacy Ratio (as a percent) 8.00% 8.00%
Capital Required For Capital Adequacy With Capital Buffer $ 481,201 $ 406,919
Capital Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets [1] 9.25% 8.625%
Capital Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets Fully Phased In 10.50%  
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 520,218 $ 471,791
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00% 10.00%
Tier I Capital (to Risk-Weighted Assets):    
Actual Amount $ 699,420 $ 651,006
Actual Ratio (as a percent) 13.44% 13.80%
Minimum Capital Adequacy Amount $ 312,131 $ 283,074
Minimum Capital Adequacy Ratio (as a percent) 6.00% 6.00%
Tier One Risk Based Capital Required for Capital Adequacy with Capital Buffer $ 377,158 $ 312,561
Tier One Risk Based Capital Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets [1] 7.25% 6.625%
Tier One Risk Based Capital Required For Capital Adequacy With Capital Buffer To Risk Weighted Assets Fully Phased In 8.50%  
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 416,174 $ 377,432
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets):    
Actual Amount $ 642,420 $ 594,006
Actual Ratio (as a percent) 12.35% 12.59%
Minimum Capital Adequacy Amount $ 234,098 $ 212,306
Minimum Capital Adequacy Ratio (as a percent) 4.50% 4.50%
Common Equity Tier 1 Capita Required Form Minimum Capital Adequacy With Capital Buffer $ 299,125 $ 241,793
Common Equity Tier 1 Capital Required For Capital Adequacy With Capital Buffer to Risk Weighted Assets [1] 5.75% 5.125%
Common Equity Tier 1 Capital Required For Capital Adequacy With Capital Buffer to Risk Weighted Assets Fully Phased In 7.00%  
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 338,142 $ 306,664
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%
Tier I Capital (to Average Assets):    
Actual Amount $ 699,420 $ 651,006
Actual Ratio (as a percent) 12.17% 12.11%
Minimum Capital Adequacy Amount $ 229,890 $ 215,115
Minimum Capital Adequacy Ratio (as a percent) 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 287,362 $ 268,893
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00% 5.00%
1st Source Bank    
Total Capital (to Risk-Weighted Assets):    
Actual Amount $ 696,248 $ 662,531
Actual Ratio (as a percent) 13.36% 14.06%
Minimum Capital Adequacy Amount $ 416,902 $ 377,014
Minimum Capital Adequacy Ratio (as a percent) 8.00% 8.00%
Capital Required For Capital Adequacy With Capital Buffer $ 482,043 $ 406,468
Capital Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets [1] 9.25% 8.625%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 521,127 $ 471,267
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00% 10.00%
Tier I Capital (to Risk-Weighted Assets):    
Actual Amount $ 630,702 $ 603,022
Actual Ratio (as a percent) 12.10% 12.80%
Minimum Capital Adequacy Amount $ 312,676 $ 282,760
Minimum Capital Adequacy Ratio (as a percent) 6.00% 6.00%
Tier One Risk Based Capital Required for Capital Adequacy with Capital Buffer $ 377,817 $ 312,214
Tier One Risk Based Capital Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets [1] 7.25% 6.625%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 416,902 $ 377,014
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets):    
Actual Amount $ 630,702 $ 603,022
Actual Ratio (as a percent) 12.10% 12.80%
Minimum Capital Adequacy Amount $ 234,507 $ 212,070
Minimum Capital Adequacy Ratio (as a percent) 4.50% 4.50%
Common Equity Tier 1 Capita Required Form Minimum Capital Adequacy With Capital Buffer $ 299,648 $ 241,524
Common Equity Tier 1 Capital Required For Capital Adequacy With Capital Buffer to Risk Weighted Assets [1] 5.75% 5.125%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 338,733 $ 306,324
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%
Tier I Capital (to Average Assets):    
Actual Amount $ 630,702 $ 603,022
Actual Ratio (as a percent) 10.98% 11.22%
Minimum Capital Adequacy Amount $ 229,789 $ 214,949
Minimum Capital Adequacy Ratio (as a percent) 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 287,236 $ 268,686
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00% 5.00%
[1] (1) The capital conservation buffer requirement will be phased in over three years beginning in 2016. The capital buffer requirement effectively raises the minimum required common equity Tier 1 capital ratio to 7.0%, the Tier 1 capital ratio to 8.5%, and the total capital ratio to 10.5% on a fully phased-in basis.