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Acquisitions - Schedule of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017	Sep. 01, 2017	Dec. 31, 2016	Jul. 18, 2016	Jun. 01, 2016
Loans
Goodwill		$ 119,880	$ 119,880		$ 76,941
LaPorte Bancorp Inc [Member]
Assets
Cash and due from banks						$ 154,849
Investment securities, available for sale						23,779
Loans
Total loans						312,906
Premises and equipment, net						6,022
FHLB stock						4,029
Goodwill						20,993
Core deposit intangible						2,514
Interest receivable						844
Cash value of life insurance						15,267
Other assets						8,334
Total assets purchased						549,537
Common shares issued						60,306
Cash paid						38,328
Total purchase price						98,634
Deposits
Non-interest bearing						66,733
NOW accounts						99,346
Savings and money market						117,688
Certificates of deposit						87,605
Total deposits						371,372
Borrowings						64,793
Subordinated debt						4,504
Interest payable						178
Other liabilities						10,056
Total liabilities assumed						450,903
LaPorte Bancorp Inc [Member] | Residential Mortgage [Member]
Loans
Total loans						42,603
LaPorte Bancorp Inc [Member] | Mortgage Warehousing [Member]
Loans
Total loans						99,752
LaPorte Bancorp Inc [Member] | Commercial [Member]
Loans
Total loans						153,750
LaPorte Bancorp Inc [Member] | Consumer [Member]
Loans
Total loans						$ 16,801
Kosciusko Financial Inc [Member]
Assets
Cash and due from banks							$ 38,950
Investment securities, available for sale							1,191
Loans
Total loans							102,569
Premises and equipment, net							1,466
FHLB stock							582
Goodwill							6,443
Core deposit intangible							526
Interest receivable							636
Cash value of life insurance							2,745
Other assets							765
Total assets purchased							155,873
Common shares issued							14,470
Cash paid							8,513
Total purchase price							22,983
Deposits
Non-interest bearing							27,871
NOW accounts							35,213
Savings and money market							26,953
Certificates of deposit							32,771
Total deposits							122,808
Borrowings							9,038
Interest payable							55
Other liabilities							989
Total liabilities assumed							132,890
Kosciusko Financial Inc [Member] | Residential Mortgage [Member]
Loans
Total loans							26,244
Kosciusko Financial Inc [Member] | Commercial [Member]
Loans
Total loans							70,006
Kosciusko Financial Inc [Member] | Consumer [Member]
Loans
Total loans							$ 6,319
Lafayette Community Bancorp [Member]
Assets
Cash and due from banks				$ 24,846
Investment securities, available for sale				6
Loans
Total loans				134,299
Premises and equipment, net				7,818
FHLB stock				395
Goodwill				15,408
Core deposit intangible				2,085
Interest receivable				338
Other assets				1,649
Total assets purchased				186,844
Common shares issued	[1]			30,044
Cash paid				4,421
Total purchase price				34,465
Deposits
Non-interest bearing				34,990
NOW accounts				30,174
Savings and money market				53,663
Certificates of deposit				32,520
Total deposits				151,347
Interest payable				42
Other liabilities				990
Total liabilities assumed				152,379
Lafayette Community Bancorp [Member] | Residential Mortgage [Member]
Loans
Total loans				12,761
Lafayette Community Bancorp [Member] | Commercial [Member]
Loans
Total loans				116,258
Lafayette Community Bancorp [Member] | Consumer [Member]
Loans
Total loans				$ 5,280
[1] This includes $955,000 of common shares previously held by Horizon.

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