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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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