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Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities                      
Net income $ 7,650 $ 8,171 $ 9,072 $ 8,224 $ 5,603 $ 6,602 $ 6,326 $ 5,381 $ 33,117 $ 23,912 $ 20,549
Items not requiring (providing) cash                      
Change in Share based compensation                 325 324 288
Other assets                 6,173 489 8,569
Other liabilities                 (5,776) (8,381) (472)
Net cash provided by operating activities                 49,064 25,548 35,230
Investing Activities                      
Net cash used in investing activities                 (279,874) 226,390 (124,188)
Financing Activities                      
Redemption of preferred stock                   (12,500)  
Net change in borrowings                 259,895 (255,994) 49,421
Dividends paid on preferred shares                   (42) (125)
Dividends paid on common shares                 (11,720) (8,382) (6,216)
Exercise of stock options                 1,600 214 403
Net cash provided by (used in) financing activities                 236,419 (229,756) 94,132
Net Change in Cash and Cash Equivalents                 5,609 22,182 5,174
Cash and Cash Equivalents, Beginning of Period       70,832       48,650 70,832 48,650 43,476
Cash and Cash Equivalents, End of Period 76,441       70,832       76,441 70,832 48,650
Peoples Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                     182,413
Kosciusko Financial Inc [Member]                      
Investing Activities                      
Acquisition of businesses                   30,437  
LaPorte Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                   116,521  
Central National Bank & Trust [Member]                      
Investing Activities                      
Acquisition of businesses                   22,549  
Lafayette Community Bancorp [Member]                      
Investing Activities                      
Acquisition of businesses                 20,425    
Wolverine Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                 12,788    
Parent Company [Member]                      
Operating Activities                      
Net income                 33,117 23,912 20,549
Items not requiring (providing) cash                      
Equity in undistributed net income of subsidiaries                 (8,804) (5,938) 8,168
Change in Share based compensation                 325 284 288
Amortization of unearned compensation                 135 324 355
Other assets                 388 888 (634)
Other liabilities                 (1,675) (244) (13)
Net cash provided by operating activities                 23,486 19,226 28,713
Investing Activities                      
Net cash used in investing activities                 (8,942) (29,145) (19,365)
Financing Activities                      
Redemption of preferred stock                   (12,500)  
Net change in borrowings                 (6,803) 19,500  
Dividends paid on preferred shares                   (42) (125)
Dividends paid on common shares                 (11,720) (8,382) (6,216)
Exercise of stock options                 1,604 572 4,305
Net cash provided by (used in) financing activities                 (16,919) (852) (2,036)
Net Change in Cash and Cash Equivalents                 (2,375) (10,771) 7,312
Cash and Cash Equivalents, Beginning of Period       $ 15,736       $ 26,507 15,736 26,507 19,195
Cash and Cash Equivalents, End of Period $ 13,361       $ 15,736       13,361 15,736 26,507
Parent Company [Member] | Peoples Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                     $ (19,365)
Parent Company [Member] | Kosciusko Financial Inc [Member]                      
Investing Activities                      
Acquisition of businesses                   (6,741)  
Parent Company [Member] | LaPorte Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                   (17,108)  
Parent Company [Member] | Central National Bank & Trust [Member]                      
Investing Activities                      
Acquisition of businesses                   $ (5,296)  
Parent Company [Member] | Lafayette Community Bancorp [Member]                      
Investing Activities                      
Acquisition of businesses                 (1,254)    
Parent Company [Member] | Wolverine Bancorp Inc [Member]                      
Investing Activities                      
Acquisition of businesses                 $ (7,688)