Condensed Financial Information (Parent Company Only) - Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 18,101us-gaap_NetIncomeLoss	$ 19,876us-gaap_NetIncomeLoss	$ 19,543us-gaap_NetIncomeLoss
Items not requiring (providing) cash
Share based compensation	203us-gaap_ShareBasedCompensation	48us-gaap_ShareBasedCompensation	33us-gaap_ShareBasedCompensation
Other assets	(4,945)	9,905	1,030
Other liabilities	712	498	(3,072)
Net cash provided by operating activities	17,665	46,965	26,346
Investing Activities
Net cash provided by (used in) by investing activities	(149,046)	49,797	(60,383)
Financing Activities
Dividends paid on preferred shares	(133)	(370)	(481)
Dividends paid on common shares	(4,744)us-gaap_PaymentsOfDividendsCommonStock	(3,655)us-gaap_PaymentsOfDividendsCommonStock	(3,047)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities	143,136	(95,776)	44,325
Net Change in Cash and Cash Equivalents	11,755	986	10,288
Cash and Cash Equivalents, Beginning of Period	31,721	30,735	20,447
Cash and Cash Equivalents, End of Period	43,476	31,721	30,735
Summit [Member]
Investing Activities
Acquisition of businesses	7,914
Heartland [Member]
Investing Activities
Acquisition of businesses			26,283
Parent Company [Member]
Operating Activities
Net income	18,101	19,876	19,543
Items not requiring (providing) cash
Equity in undistributed net income of subsidiaries	(6,814)	(13,144)	(4,766)
Income taxes receivable	434	(793)	(137)
Share based compensation	203	48	33
Amortization of unearned compensation	363	288	187
Issuance of restricted shares			115
Other assets	472	626	(176)
Other liabilities	1,377	97	1,128
Net cash provided by operating activities	14,136	6,998	15,927
Investing Activities
Net cash provided by (used in) by investing activities	(7,036)		(7,248)
Financing Activities
Dividends paid on preferred shares	(133)	(370)	(481)
Dividends paid on common shares	(4,744)	(3,655)	(3,047)
Exercise of stock options	165	195	226
Net cash provided by (used in) financing activities	(4,712)	(3,830)	(3,302)
Net Change in Cash and Cash Equivalents	2,388	3,168	5,377
Cash and Cash Equivalents, Beginning of Period	16,807	13,639	8,262
Cash and Cash Equivalents, End of Period	19,195	16,807	13,639
Parent Company [Member] \| Summit [Member]
Investing Activities
Acquisition of businesses	(7,036)
Parent Company [Member] \| Heartland [Member]
Investing Activities
Acquisition of businesses			$ (7,248)

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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