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Loans to Customers, net - Allowance for loan losses (Details) $ in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($) | Dec. 31, 2015 CLP ($)
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | $ (24,843,655) | $ (24,022,983) |
Balance as of end of period | $ (40,550,009) | (24,955,692) | (24,843,655) | $ (24,022,983)
Commercial loans |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | (14,226,761) | (14,101,661) |
Balance as of end of period |  | (13,739,589) | (14,226,761) | (14,101,661)
Residential mortgage loans |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | (6,892,019) | (6,374,981) |
Balance as of end of period |  | (7,445,221) | (6,892,019) | (6,374,981)
Consumer loans |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | (3,724,875) | (3,546,341) |
Balance as of end of period |  | (3,770,882) | (3,724,875) | (3,546,341)
Accumulated Amortization and Impairment |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 554,769 | 550,443 |
Balance as of end of period |  | 495,821 | 554,769 | 550,443
Accumulated Amortization and Impairment | Total provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 554,769 | 550,443 | 490,558
Charge-offs |  | (318,790) | (277,057) | (256,556)
Sales or transfer of credits |  | (11,595) | (24,925) | (2,690)
Loan portfolio acquisition |  |  |  | 12,329
Allowances (released) established, net |  | 271,437 | 306,308 | 306,802
Balance as of end of period |  | 495,821 | 554,769 | 550,443
Accumulated Amortization and Impairment | Individual Provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 164,662 | 212,424 |
Balance as of end of period |  | 110,722 | 164,662 | 212,424
Accumulated Amortization and Impairment | Group Provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 390,107 | 338,019 |
Balance as of end of period |  | 385,099 | 390,107 | 338,019
Accumulated Amortization and Impairment | Commercial loans |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 272,274 | 319,504 |
Balance as of end of period |  | 221,229 | 272,274 | 319,504
Accumulated Amortization and Impairment | Commercial loans | Individual Provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 164,662 | 212,424 | 162,067
Charge-offs |  | (13,774) | (14,913) | (13,228)
Sales or transfer of credits |  | (11,595) | (24,925) | (2,690)
Loan portfolio acquisition |  |  |  | 12,329
Allowances (released) established, net |  | (28,571) | (7,924) | 53,946
Balance as of end of period |  | 110,722 | 164,662 | 212,424
Accumulated Amortization and Impairment | Commercial loans | Group Provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 107,612 | 107,080 | 111,746
Charge-offs |  | (44,942) | (44,930) | (44,760)
Allowances (released) established, net |  | 47,837 | 45,462 | 40,094
Balance as of end of period |  | 110,507 | 107,612 | 107,080
Accumulated Amortization and Impairment | Residential mortgage loans |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 32,747 | 30,005 |
Balance as of end of period |  | 32,015 | 32,747 | 30,005
Accumulated Amortization and Impairment | Residential mortgage loans | Group Provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 32,747 | 30,005 | 24,021
Charge-offs |  | (5,093) | (4,190) | (2,553)
Allowances (released) established, net |  | 4,361 | 6,932 | 8,537
Balance as of end of period |  | 32,015 | 32,747 | 30,005
Accumulated Amortization and Impairment | Consumer loans |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 249,748 | 200,934 |
Balance as of end of period |  | 242,577 | 249,748 | 200,934
Accumulated Amortization and Impairment | Consumer loans | Group Provision |  |  |  |
Allowances for loan losses |  |  |  |
Balance as of beginning of period |  | 249,748 | 200,934 | 192,724
Charge-offs |  | (254,981) | (213,024) | (196,015)
Allowances (released) established, net |  | 247,810 | 261,838 | 204,225
Balance as of end of period |  | $ 242,577 | $ 249,748 | $ 200,934

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