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Regulatory Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 24, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Leverage Ratio            
Cash dividends declared per common share (dollars per share)   $ 0.28 $ 0.27 $ 0.56 $ 0.54  
Subsequent Event            
Leverage Ratio            
Cash dividends declared per common share (dollars per share) $ 0.34          
Chemical Bank            
Regulatory Capital            
Risk weighted assets   $ 15,130,000   $ 15,130,000   $ 14,700,000
Total Capital to Risk-Weighted Assets            
Actual Amount   $ 1,725,300   $ 1,725,300   $ 1,613,087
Actual Ratio   11.40%   11.40%   11.00%
For Capital Adequacy Purposes Amount   $ 1,210,346   $ 1,210,346   $ 1,176,361
For Capital Adequacy Purposes Ratio   8.00%   8.00%   8.00%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 1,494,021   $ 1,494,021   $ 1,360,167
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   9.90%   9.90%   9.30%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount   $ 1,512,932   $ 1,512,932   $ 1,470,451
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio   10.00%   10.00%   10.00%
Tier 1 Capital to Risk-Weighted Assets            
Actual Amount   $ 1,617,483   $ 1,617,483   $ 1,513,219
Actual Ratio   10.70%   10.70%   10.30%
For Capital Adequacy Purposes Amount   $ 907,759   $ 907,759   $ 882,271
For Capital Adequacy Purposes Ratio   6.00%   6.00%   6.00%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 1,191,434   $ 1,191,434   $ 1,066,077
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   7.90%   7.90%   7.30%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount   $ 1,210,346   $ 1,210,346   $ 1,176,361
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio   8.00%   8.00%   8.00%
Common Equity Tier 1 Capital to Risk-Weighted Assets            
Actual Amount   $ 1,617,483   $ 1,617,483   $ 1,513,219
Actual Ratio   10.70%   10.70%   10.30%
For Capital Adequacy Purposes Amount   $ 680,819   $ 680,819   $ 661,703
For Capital Adequacy Purposes Ratio   4.50%   4.50%   4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 964,494   $ 964,494   $ 854,509
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   6.40%   6.40%   5.80%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount   $ 983,406   $ 983,406   $ 955,793
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio   6.50%   6.50%   6.50%
Leverage Ratio            
Actual Amount   $ 1,617,483   $ 1,617,483   $ 1,513,219
Actual Ratio   8.70%   8.70%   8.40%
For Capital Adequacy Purposes Amount   $ 747,112   $ 747,112   $ 720,043
For Capital Adequacy Purposes Ratio   4.00%   4.00%   4.00%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 747,112   $ 747,112   $ 720,043
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   4.00%   4.00%   4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount   $ 933,891   $ 933,891   $ 900,053
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio   5.00%   5.00%   5.00%
Corporation            
Regulatory Capital            
Risk weighted assets   $ 15,160,000   $ 15,160,000   $ 14,740,000
Total Capital to Risk-Weighted Assets            
Actual Amount   $ 1,732,830   $ 1,732,830   $ 1,614,046
Actual Ratio   11.40%   11.40%   11.00%
For Capital Adequacy Purposes Amount   $ 1,212,912   $ 1,212,912   $ 1,179,076
For Capital Adequacy Purposes Ratio   8.00%   8.00%   8.00%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 1,497,188   $ 1,497,188   $ 1,363,307
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   9.90%   9.90%   9.30%
Tier 1 Capital to Risk-Weighted Assets            
Actual Amount   $ 1,609,206   $ 1,609,206   $ 1,498,463
Actual Ratio   10.60%   10.60%   10.20%
For Capital Adequacy Purposes Amount   $ 909,684   $ 909,684   $ 884,307
For Capital Adequacy Purposes Ratio   6.00%   6.00%   6.00%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 1,193,960   $ 1,193,960   $ 1,068,538
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   7.90%   7.90%   7.30%
Common Equity Tier 1 Capital to Risk-Weighted Assets            
Actual Amount   $ 1,609,206   $ 1,609,206   $ 1,498,463
Actual Ratio   10.60%   10.60%   10.20%
For Capital Adequacy Purposes Amount   $ 682,263   $ 682,263   $ 663,230
For Capital Adequacy Purposes Ratio   4.50%   4.50%   4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 966,539   $ 966,539   $ 847,461
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   6.40%   6.40%   5.80%
Leverage Ratio            
Actual Amount   $ 1,609,206   $ 1,609,206   $ 1,498,463
Actual Ratio   8.60%   8.60%   8.30%
For Capital Adequacy Purposes Amount   $ 747,999   $ 747,999   $ 720,890
For Capital Adequacy Purposes Ratio   4.00%   4.00%   4.00%
For Capital Adequacy Purposes Plus Capital Conservation Buffer Amount   $ 747,999   $ 747,999   $ 720,890
For Capital Adequacy Purposes Plus Capital Conservation Buffer Ratio   4.00%   4.00%   4.00%