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v2.4.1.9

Calculation for Basic and Diluted Earnings per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Calculation For Basic And Diluted Earnings Per Common Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,715 us-gaap_NetIncomeLoss | $ 7,043 us-gaap_NetIncomeLoss | $ 7,007 us-gaap_NetIncomeLoss | $ 5,725 us-gaap_NetIncomeLoss | $ 5,324 us-gaap_NetIncomeLoss | $ 5,412 us-gaap_NetIncomeLoss | $ 5,435 us-gaap_NetIncomeLoss | $ 7,141 us-gaap_NetIncomeLoss | $ 25,490 us-gaap_NetIncomeLoss | $ 23,312 us-gaap_NetIncomeLoss | $ 28,577 us-gaap_NetIncomeLoss
Dividends on preferred stock | 227 us-gaap_PreferredStockDividendsIncomeStatementImpact | 228 us-gaap_PreferredStockDividendsIncomeStatementImpact | 227 us-gaap_PreferredStockDividendsIncomeStatementImpact | 228 us-gaap_PreferredStockDividendsIncomeStatementImpact | 252 us-gaap_PreferredStockDividendsIncomeStatementImpact | 261 us-gaap_PreferredStockDividendsIncomeStatementImpact | 253 us-gaap_PreferredStockDividendsIncomeStatementImpact | 258 us-gaap_PreferredStockDividendsIncomeStatementImpact | 910 us-gaap_PreferredStockDividendsIncomeStatementImpact | 1,024 us-gaap_PreferredStockDividendsIncomeStatementImpact | 1,058 us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common shareholders | $ 5,488 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,815 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,780 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,497 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,072 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,151 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,182 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,883 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 24,580 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 22,288 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 27,519 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average number of common shares outstanding, basic | 18,403,959 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,402,764 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,395,996 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,423,123 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,136,317 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,008,861 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,997,991 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,032,694 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,406,363 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,792,099 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,127,065 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Convertible preferred stock |  |  |  |  |  |  |  |  | 1,046,175 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 1,132,998 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 1,285,848 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Contingently issuable shares |  |  |  |  |  |  |  |  | 11,448 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 12,352 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares |
Weighted average number of common shares outstanding, diluted | 19,482,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,466,126 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,457,237 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,506,647 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,233,737 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,123,788 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,205,078 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,258,490 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,483,054 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,961,800 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,419,569 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ 1.34 us-gaap_EarningsPerShareBasic | $ 1.13 us-gaap_EarningsPerShareBasic | $ 1.44 us-gaap_EarningsPerShareBasic
Diluted earnings per common share | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 1.31 us-gaap_EarningsPerShareDiluted | $ 1.11 us-gaap_EarningsPerShareDiluted | $ 1.40 us-gaap_EarningsPerShareDiluted
Total potential antidilutive shares |  |  |  |  |  |  |  |  | 222,651 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 317,691 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 420,802 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Stock Option |  |  |  |  |  |  |  |  |  |  |
Calculation For Basic And Diluted Earnings Per Common Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock attributable to share based compensation |  |  |  |  |  |  |  |  | 18,607 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 19,337 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 4,549 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Total potential antidilutive shares |  |  |  |  |  |  |  |  | 222,651 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 317,420 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 420,802 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Calculation For Basic And Diluted Earnings Per Common Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock attributable to share based compensation |  |  |  |  |  |  |  |  | 461 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember | 5,014 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember | 2,107 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember
Total potential antidilutive shares |  |  |  |  |  |  |  |  |  | 271 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockMember |

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