Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.20.2
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2020
Nov. 06, 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 Q3  
Document Fiscal Year Focus 2020  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 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, City or Town Munster  
Entity Address, State or Province IN  
Entity Address, Postal Zip Code 46321  
City Area Code 219  
Local Phone Number 836-4400  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   3,463,136