XML 59 R83.htm IDEA: XBRL DOCUMENT v2.4.1.9
Regulatory Capital (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Total capital (to risk-weighted assets)    
Actual, Amount $ 1,065,282us-gaap_Capital $ 1,005,980us-gaap_Capital
Actual, Ratio 18.93%us-gaap_CapitalToRiskWeightedAssets 18.97%us-gaap_CapitalToRiskWeightedAssets
Minimum capital requirement, Amount 450,240us-gaap_CapitalRequiredForCapitalAdequacy 424,322us-gaap_CapitalRequiredForCapitalAdequacy
Minimum capital requirement, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Well capitalized requirement, Amount 562,800us-gaap_CapitalRequiredToBeWellCapitalized 530,402us-gaap_CapitalRequiredToBeWellCapitalized
Well capitalized requirement, Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 capital (to risk-weighted assets)    
Actual, Amount 994,197us-gaap_TierOneRiskBasedCapital 938,887us-gaap_TierOneRiskBasedCapital
Actual, Ratio 17.67%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 17.70%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Minimum capital requirement, Amount 225,120us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 212,161us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Minimum capital requirement, Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Well capitalized requirement, Amount 337,680us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized 318,241us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Well capitalized requirement, Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier 1 capital (to average assets)    
Actual, Amount 994,197us-gaap_TierOneLeverageCapital 938,887us-gaap_TierOneLeverageCapital
Actual, Ratio 12.45%us-gaap_TierOneLeverageCapitalToAverageAssets 12.11%us-gaap_TierOneLeverageCapitalToAverageAssets
Minimum capital requirement, Amount 319,505us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 310,082us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Minimum capital requirement, Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Glacier Bank    
Total capital (to risk-weighted assets)    
Actual, Amount 1,023,669us-gaap_Capital
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 948,618us-gaap_Capital
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Actual, Ratio 18.25%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 17.93%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Minimum capital requirement, Amount 448,739us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 423,235us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Minimum capital requirement, Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Well capitalized requirement, Amount 560,924us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 529,044us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Well capitalized requirement, Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Tier 1 capital (to risk-weighted assets)    
Actual, Amount 952,815us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 881,692us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Actual, Ratio 16.99%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 16.67%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Minimum capital requirement, Amount 224,370us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 211,618us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Minimum capital requirement, Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Well capitalized requirement, Amount 336,554us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 317,426us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Well capitalized requirement, Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Tier 1 capital (to average assets)    
Actual, Amount 952,815us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 881,692us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Actual, Ratio 12.03%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 11.44%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Minimum capital requirement, Amount 316,938us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 308,281us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Minimum capital requirement, Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Well capitalized requirement, Amount $ 396,173us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 $ 385,351us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= gbci_GlacierBankMember
Well capitalized requirement, Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= gbci_GlacierBankMember