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Nature of Operations and Summary of Significant Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic earnings per share
Net income	$ 4,948us-gaap_NetIncomeLoss	$ 4,958us-gaap_NetIncomeLoss	$ 4,778us-gaap_NetIncomeLoss	$ 3,417us-gaap_NetIncomeLoss	$ 4,115us-gaap_NetIncomeLoss	$ 4,785us-gaap_NetIncomeLoss	$ 5,665us-gaap_NetIncomeLoss	$ 5,311us-gaap_NetIncomeLoss	$ 18,101us-gaap_NetIncomeLoss	$ 19,876us-gaap_NetIncomeLoss	$ 19,543us-gaap_NetIncomeLoss
Less: Preferred stock dividends									133us-gaap_PreferredStockDividendsAndOtherAdjustments	370us-gaap_PreferredStockDividendsAndOtherAdjustments	481us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income available to common shareholders	4,917us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,918us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,747us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	3,386us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,052us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	4,719us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,569us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	5,165us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	17,968us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	19,506us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	19,062us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding	9,212,156us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,208,707us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,182,986us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,630,966us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,623,360us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,618,969us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,617,466us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,617,466us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,060,702us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,619,330us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	7,974,241us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic Earnings Per Share	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic	$ 1.98us-gaap_EarningsPerShareBasic	$ 2.26us-gaap_EarningsPerShareBasic	$ 2.39us-gaap_EarningsPerShareBasic
Diluted earnings per share
Net income available to common shareholders									$ 17,968us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 19,506us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 19,062us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average common shares outstanding	9,212,156us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,208,707us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,182,986us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,630,966us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,623,360us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,618,969us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,617,466us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,617,466us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,060,702us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,619,330us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	7,974,241us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Warrants									315,679us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	303,970us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	245,514us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Weighted average shares outstanding	9,628,240us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,588,332us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,560,939us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,021,786us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,020,289us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,019,211us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,974,103us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,980,655us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,454,125us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,000,963us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,271,177us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted Earnings Per Share	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.52us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 1.90us-gaap_EarningsPerShareDiluted	$ 2.17us-gaap_EarningsPerShareDiluted	$ 2.30us-gaap_EarningsPerShareDiluted
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities									39,476us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	40,160us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	23,181us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities									38,268us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	37,503us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	28,241us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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