XML 36 R36.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Loans Receivable, Net (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 Loan | Mar. 31, 2012 Loan
--- | --- | ---
Summary of troubled debt restructurings |  |
Troubled debt restructurings, Number of Loans | 24 | 56
Troubled debt restructurings, Pre-modification recorded balance | $ 6,250 | $ 16,526
Troubled debt restructurings, Post-modification recorded balance | 6,591 | 15,819
Troubled debt restructurings that subsequently defaulted, number of loans | 5 | 15
Troubled debt restructurings that subsequently defaulted, recorded balance | 1,109 | 4,484
Residential Real Estate [Member] |  |
Summary of troubled debt restructurings |  |
Troubled debt restructurings, Number of Loans | 7 | 3
Troubled debt restructurings, Pre-modification recorded balance | 1,358 | 359
Troubled debt restructurings, Post-modification recorded balance | 1,699 | 359
Troubled debt restructurings that subsequently defaulted, number of loans | 0 | 0
Troubled debt restructurings that subsequently defaulted, recorded balance | 0 | 0
Commercial Real Estate [Member] |  |
Summary of troubled debt restructurings |  |
Troubled debt restructurings, Number of Loans | 9 | 25
Troubled debt restructurings, Pre-modification recorded balance | 3,316 | 11,110
Troubled debt restructurings, Post-modification recorded balance | 3,316 | 10,393
Troubled debt restructurings that subsequently defaulted, number of loans | 3 | 7
Troubled debt restructurings that subsequently defaulted, recorded balance | 1,052 | 3,037
Other Commercial [Member] |  |
Summary of troubled debt restructurings |  |
Troubled debt restructurings, Number of Loans | 7 | 19
Troubled debt restructurings, Pre-modification recorded balance | 1,505 | 4,123
Troubled debt restructurings, Post-modification recorded balance | 1,505 | 4,133
Troubled debt restructurings that subsequently defaulted, number of loans | 1 | 4
Troubled debt restructurings that subsequently defaulted, recorded balance | 12 | 790
Home Equity [Member] |  |
Summary of troubled debt restructurings |  |
Troubled debt restructurings, Number of Loans | 0 | 6
Troubled debt restructurings, Pre-modification recorded balance | 0 | 785
Troubled debt restructurings, Post-modification recorded balance | 0 | 785
Troubled debt restructurings that subsequently defaulted, number of loans | 0 | 2
Troubled debt restructurings that subsequently defaulted, recorded balance | 0 | 599
Other Consumer [Member] |  |
Summary of troubled debt restructurings |  |
Troubled debt restructurings, Number of Loans | 1 | 3
Troubled debt restructurings, Pre-modification recorded balance | 71 | 149
Troubled debt restructurings, Post-modification recorded balance | 71 | 149
Troubled debt restructurings that subsequently defaulted, number of loans | 1 | 2
Troubled debt restructurings that subsequently defaulted, recorded balance | $ 45 | $ 58

X
- Details
Name: | gbci_SummaryOfTroubledDebtRestructuringsAbstract
Namespace Prefix: | gbci_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant