Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 2,924,516		$ 2,831,995
Allowance for Loan Losses	(17,071)	$ (16,474)	(16,394)	$ (15,027)	$ (15,054)	$ (14,837)
Carrying Amount	2,902,817		2,809,308
Loans Purchased With Evidence of Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	21,106		29,863
Allowance for Loan Losses	0		0
Carrying Amount	21,106		29,863
Loans Purchased With Evidence of Credit Deterioration [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	18,998		27,198
Loans Purchased With Evidence of Credit Deterioration [Member] \| Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,078		2,632
Loans Purchased With Evidence of Credit Deterioration [Member] \| Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	30		33
Loans Purchased With Evidence of Credit Deterioration [Member] \| Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	447		619
Allowance for Loan Losses	0		0
Carrying Amount	447		619
Loans Purchased With Evidence of Credit Deterioration [Member] \| Heartland [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	254		390
Loans Purchased With Evidence of Credit Deterioration [Member] \| Heartland [Member] \| Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	193		229
Loans Purchased With Evidence of Credit Deterioration [Member] \| Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,893		4,523
Allowance for Loan Losses	0		0
Carrying Amount	3,893		4,523
Loans Purchased With Evidence of Credit Deterioration [Member] \| Summit [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,301		3,653
Loans Purchased With Evidence of Credit Deterioration [Member] \| Summit [Member] \| Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	592		870
Loans Purchased With Evidence of Credit Deterioration [Member] \| Peoples Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	408		441
Allowance for Loan Losses	0		0
Carrying Amount	408		441
Loans Purchased With Evidence of Credit Deterioration [Member] \| Peoples Bancorp Inc [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	296		315
Loans Purchased With Evidence of Credit Deterioration [Member] \| Peoples Bancorp Inc [Member] \| Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	112		126
Loans Purchased With Evidence of Credit Deterioration [Member] \| Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	998		1,241
Allowance for Loan Losses	0		0
Carrying Amount	998		1,241
Loans Purchased With Evidence of Credit Deterioration [Member] \| Kosciusko Financial Inc [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	791		838
Loans Purchased With Evidence of Credit Deterioration [Member] \| Kosciusko Financial Inc [Member] \| Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	207		403
Loans Purchased With Evidence of Credit Deterioration [Member] \| LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,859		2,071
Allowance for Loan Losses	0		0
Carrying Amount	1,859		2,071
Loans Purchased With Evidence of Credit Deterioration [Member] \| LaPorte Bancorp Inc [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	855		1,034
Loans Purchased With Evidence of Credit Deterioration [Member] \| LaPorte Bancorp Inc [Member] \| Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	974		1,004
Loans Purchased With Evidence of Credit Deterioration [Member] \| LaPorte Bancorp Inc [Member] \| Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	30		33
Loans Purchased With Evidence of Credit Deterioration [Member] \| Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,481		4,271
Allowance for Loan Losses	0		0
Carrying Amount	3,481		4,271
Loans Purchased With Evidence of Credit Deterioration [Member] \| Lafayette Community Bancorp [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,481		4,271
Loans Purchased With Evidence of Credit Deterioration [Member] \| Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	10,020		16,697
Allowance for Loan Losses	0		0
Carrying Amount	10,020		16,697
Loans Purchased With Evidence of Credit Deterioration [Member] \| Wolverine Bancorp Inc [Member] \| Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 10,020		$ 16,697