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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
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Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
LIBOR period | 3 months |
Weighted average fixed rate | 5.81% |
Recorded period of effectiveness of cash flow hedges on net income | 12 months |
Recorded period of effectiveness of fair value hedges on net income | 12 months |
Recorded period of effectiveness of fair value of derivatives on net income | 12 months |
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
LIBOR period | 1 month |
Weighted average fixed rate | 2.81% |
LaPorte Bancorp Inc [Member] |  |
Derivative [Line Items] |  |
LIBOR period | 1 month |
Weighted average fixed rate | 2.31% |
Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | $ 30.5 | $ 30.5
Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | 50.0 |
Cash Flow Hedging [Member] | LaPorte Bancorp Inc [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | 30.0 | 30.0
Derivative in Fair Value Hedging Relationship [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest | $ 205.8 | $ 154.6

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- Definition Fair flow hedge derivatives expected period of insignificant impact on net income. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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