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v2.4.1.9

Goodwill and other Intangible Assets (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Roll Forward] |  |  |
Beginning Balance | $ 264,997,000 us-gaap_Goodwill | $ 152,373,000 us-gaap_Goodwill |
Goodwill acquired | (1,363,000)us-gaap_GoodwillAcquiredDuringPeriod | 112,624,000 us-gaap_GoodwillAcquiredDuringPeriod |
Ending Balance | 263,634,000 us-gaap_Goodwill | 264,997,000 us-gaap_Goodwill | 152,373,000 us-gaap_Goodwill
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 47,717,000 us-gaap_FiniteLivedIntangibleAssetsGross | 47,910,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Less: accumulated amortization | 27,400,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 22,353,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net carrying amount | 20,317,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 25,557,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Amortization Expense [Abstract] |  |  |
Amortization of intangible assets | 5,047,000 us-gaap_AmortizationOfIntangibleAssets | 4,872,000 us-gaap_AmortizationOfIntangibleAssets | 3,394,000 us-gaap_AmortizationOfIntangibleAssets
Future Amortization Expense [Abstract] |  |  |
2015 | 4,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2016 | 3,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 2,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 2,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 1,700,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Thereafter | 3,700,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |
Indefinite-lived intangible assets (Excluding goodwill) | 1,800,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible asset useful life | 1 year |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible asset useful life | 12 years |  |
Core Deposits Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 19,401,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 19,401,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Less: accumulated amortization | 12,522,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 10,083,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Net carrying amount | 6,879,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 9,318,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Identified Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 28,316,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 28,509,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Less: accumulated amortization | 14,878,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 12,270,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Net carrying amount | $ 13,438,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ 16,239,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |

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