Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2020
Mar. 12, 2021
Jun. 30, 2020
Document Information [Line Items]      
Entity Central Index Key 0000919864    
Entity Registrant Name NORTHWEST INDIANA BANCORP    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 0-26128    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-1927981    
Entity Address, Address Line One 9204 Columbia Avenue    
Entity Address, Postal Zip Code 46321    
Entity Address, City or Town Munster    
Entity Address, State or Province IN    
City Area Code 219    
Local Phone Number 836-4400    
Title of 12(g) Security Common Stock, without par value    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 91,966,808
Entity Common Stock, Shares Outstanding   3,478,921