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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) |  |

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