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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 13,133 | $ 13,065 | $ 14,115 | $ 12,804 | $ 7,650 | $ 8,171 | $ 9,072 | $ 8,224 | $ 53,117 | $ 33,117 | $ 23,912
Items not requiring (providing) cash |  |  |  |  |  |  |  |  |  |  |
Change in Share based compensation |  |  |  |  |  |  |  |  | 251 | 325 | 324
Other assets |  |  |  |  |  |  |  |  | 2,460 | 6,173 | 489
Other liabilities |  |  |  |  |  |  |  |  | 658 | (5,776) | (8,381)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 72,440 | 49,064 | 25,548
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (303,916) | (278,924) | 222,307
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  | (12,500)
Net change in borrowings |  |  |  |  |  |  |  |  | (13,589) | 259,895 | (255,994)
Dividends paid on preferred shares |  |  |  |  |  |  |  |  |  |  | (42)
Dividends paid on common shares |  |  |  |  |  |  |  |  | (15,418) | (11,720) | (8,382)
Proceeds from issuance of stock |  |  |  |  |  |  |  |  | 622 | 1,604 | 572
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 229,988 | 236,419 | (229,756)
Net Change in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | (1,488) | 6,559 | 18,099
Cash and Cash Equivalents at Beginning of Year |  |  |  | 59,980 |  |  |  | 53,421 | 59,980 | 53,421 | 35,322
Cash and Cash Equivalents at End of Year | 58,492 |  |  |  | 59,980 |  |  |  | 58,492 | 59,980 | 53,421
Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  | 30,437
LaPorte Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  | 116,521
Central National Bank & Trust [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  | 22,549
Lafayette Community Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  | 20,425 |
Wolverine Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  | 12,723 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 53,117 | 33,117 | 23,912
Items not requiring (providing) cash |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  | (9,643) | (8,804) | (5,938)
Change in Share based compensation |  |  |  |  |  |  |  |  | 251 | 325 | 284
Amortization of unearned compensation |  |  |  |  |  |  |  |  | 169 | 135 | 324
Other assets |  |  |  |  |  |  |  |  | 132 | 388 | 888
Other liabilities |  |  |  |  |  |  |  |  | 378 | (1,675) | (244)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 44,404 | 23,486 | 19,226
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (8,942) | (29,145)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  | (12,500)
Net change in borrowings |  |  |  |  |  |  |  |  | (12,316) | (6,803) | 19,500
Dividends paid on preferred shares |  |  |  |  |  |  |  |  |  |  | (42)
Dividends paid on common shares |  |  |  |  |  |  |  |  | (15,418) | (11,720) | (8,382)
Proceeds from issuance of stock |  |  |  |  |  |  |  |  | 622 | 1,604 | 572
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (27,112) | (16,919) | (852)
Net Change in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 17,292 | (2,375) | (10,771)
Cash and Cash Equivalents at Beginning of Year |  |  |  | $ 13,361 |  |  |  | $ 15,736 | 13,361 | 15,736 | 26,507
Cash and Cash Equivalents at End of Year | $ 30,653 |  |  |  | $ 13,361 |  |  |  | $ 30,653 | 13,361 | 15,736
Parent Company [Member] | Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  | (6,741)
Parent Company [Member] | LaPorte Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  | (17,108)
Parent Company [Member] | Central National Bank & Trust [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  |  | $ (5,296)
Parent Company [Member] | Lafayette Community Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  | (1,254) |
Parent Company [Member] | Wolverine Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Transfer of loans to other real estate |  |  |  |  |  |  |  |  |  |  |
Acquisition of businesses |  |  |  |  |  |  |  |  |  | $ (7,688) |

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