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Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total capital (to risk-weighted assets)    
Actual, Amount $ 1,661,249 $ 1,437,889
Actual, Ratio 14.95% 14.70%
Minimum capital requirement, Amount $ 888,986 $ 782,453
Minimum capital requirement, Ratio 8.00% 8.00%
Tier 1 capital (to risk-weighted assets)    
Actual, Amount $ 1,528,683 $ 1,308,017
Actual, Ratio 13.76% 13.37%
Minimum capital requirement, Amount $ 666,740 $ 586,840
Minimum capital requirement, Ratio 6.00% 6.00%
Common Equity Tier 1 (to risk-weighted assets)    
Actual, Amount $ 1,398,183 $ 1,183,517
Actual, Ratio 12.58% 12.10%
Minimum capital requirement, Amount $ 500,055 $ 440,130
Minimum capital requirement, Ratio 4.50% 4.50%
Tier 1 capital (to average assets)    
Actual, Amount $ 1,528,683 $ 1,308,017
Actual, Ratio 11.65% 11.35%
Minimum capital requirement, Amount $ 524,987 $ 461,130
Minimum capital requirement, Ratio 4.00% 4.00%
Glacier Bank    
Total capital (to risk-weighted assets)    
Actual, Amount $ 1,625,527 $ 1,401,991
Actual, Ratio 14.64% 14.35%
Minimum capital requirement, Amount $ 888,110 $ 781,430
Minimum capital requirement, Ratio 8.00% 8.00%
Well capitalized requirement, Amount $ 1,110,137 $ 976,787
Well capitalized requirement, Ratio 10.00% 10.00%
Tier 1 capital (to risk-weighted assets)    
Actual, Amount $ 1,500,461 $ 1,279,778
Actual, Ratio 13.52% 13.10%
Minimum capital requirement, Amount $ 666,082 $ 586,072
Minimum capital requirement, Ratio 6.00% 6.00%
Well capitalized requirement, Amount $ 888,110 $ 781,430
Well capitalized requirement, Ratio 8.00% 8.00%
Common Equity Tier 1 (to risk-weighted assets)    
Actual, Amount $ 1,500,461 $ 1,279,778
Actual, Ratio 13.52% 13.10%
Minimum capital requirement, Amount $ 499,562 $ 439,554
Minimum capital requirement, Ratio 4.50% 4.50%
Well capitalized requirement, Amount $ 721,589 $ 634,911
Well capitalized requirement, Ratio 6.50% 6.50%
Tier 1 capital (to average assets)    
Actual, Amount $ 1,500,461 $ 1,279,778
Actual, Ratio 11.50% 11.08%
Minimum capital requirement, Amount $ 522,040 $ 462,072
Minimum capital requirement, Ratio 4.00% 4.00%
Well capitalized requirement, Amount $ 652,550 $ 577,590
Well capitalized requirement, Ratio 5.00% 5.00%