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Provisions and Contingent Provisions (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Balance at beginning $ 305,271 $ 303,798 $ 292,210
Provisions established 298,627 298,599 291,513
Application of provisions (70,540) (77,406) (224,907)
Provisions released (207,693) (210,781) (55,018)
Reclassifications  
Other 465 (8,939)  
Balance at end 326,130 305,271 303,798
Personnel salaries and expenses [Member]      
Statement Line Items [Line Items]      
Balance at beginning 93,379 97,576 72,592
Provisions established 78,316 80,912 106,687
Application of provisions (70,385) (72,975) (81,703)
Provisions released (552) (3,195)
Reclassifications
Other 465 (8,939)
Balance at end 101,223 93,379 97,576
Mandatory Dividend [Member]      
Statement Line Items [Line Items]      
Balance at beginning 178,600 168,840 142,815
Provisions established 185,727 178,600 168,840
Application of provisions (142,815)
Provisions released (178,600) (168,840)
Reclassifications
Other
Balance at end 185,727 178,600 168,840
Contingent loan [Member]      
Statement Line Items [Line Items]      
Balance at beginning 24,329 10,079 11,399
Provisions established 16,277 19,440 7,341
Application of provisions
Provisions released (16,814) (5,190) (8,661)
Reclassifications
Other
Balance at end 23,792 24,329 10,079
Contingencies [Member]      
Statement Line Items [Line Items]      
Balance at beginning 8,963 27,303 65,404
Provisions established 27,975 19,647 8,645
Application of provisions (155) (4,431) (389)
Provisions released (21,395) (33,535) (46,357)
Reclassifications  
Other  
Balance at end $ 15,388 $ 8,963 $ 27,303