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Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Total capital (to risk-weighted assets)    
Actual, Amount $ 1,437,889 $ 1,232,089
Actual, Ratio 14.70% 15.64%
Minimum capital requirement, Amount $ 782,453 $ 630,109
Minimum capital requirement, Ratio 8.00% 8.00%
Tier 1 capital (to risk-weighted assets)    
Actual, Amount $ 1,308,017 $ 1,133,125
Actual, Ratio 13.37% 14.39%
Minimum capital requirement, Amount $ 586,840 $ 472,582
Minimum capital requirement, Ratio 6.00% 6.00%
Common Equity Tier 1 (to risk-weighted assets)    
Actual, Amount $ 1,183,517 $ 1,009,276
Actual, Ratio 12.10% 12.81%
Minimum capital requirement, Amount $ 440,130 $ 354,437
Minimum capital requirement, Ratio 4.50% 4.50%
Tier 1 capital (to average assets)    
Actual, Amount $ 1,308,017 $ 1,133,125
Actual, Ratio 11.35% 11.90%
Minimum capital requirement, Amount $ 461,130 $ 380,770
Minimum capital requirement, Ratio 4.00% 4.00%
Glacier Bank    
Total capital (to risk-weighted assets)    
Actual, Amount $ 1,401,991 $ 1,182,509
Actual, Ratio 14.35% 15.04%
Minimum capital requirement, Amount $ 781,430 $ 628,823
Minimum capital requirement, Ratio 8.00% 8.00%
Well capitalized requirement, Amount $ 976,787 $ 786,029
Well capitalized requirement, Ratio 10.00% 10.00%
Tier 1 capital (to risk-weighted assets)    
Actual, Amount $ 1,279,778 $ 1,083,744
Actual, Ratio 13.10% 13.79%
Minimum capital requirement, Amount $ 586,072 $ 471,617
Minimum capital requirement, Ratio 6.00% 6.00%
Well capitalized requirement, Amount $ 781,430 $ 628,823
Well capitalized requirement, Ratio 8.00% 8.00%
Common Equity Tier 1 (to risk-weighted assets)    
Actual, Amount $ 1,279,778 $ 1,083,744
Actual, Ratio 13.10% 13.79%
Minimum capital requirement, Amount $ 439,554 $ 353,713
Minimum capital requirement, Ratio 4.50% 4.50%
Well capitalized requirement, Amount $ 634,911 $ 510,919
Well capitalized requirement, Ratio 6.50% 6.50%
Tier 1 capital (to average assets)    
Actual, Amount $ 1,279,778 $ 1,083,744
Actual, Ratio 11.08% 11.47%
Minimum capital requirement, Amount $ 462,072 $ 377,809
Minimum capital requirement, Ratio 4.00% 4.00%
Well capitalized requirement, Amount $ 577,590 $ 472,261
Well capitalized requirement, Ratio 5.00% 5.00%