Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity securities	$ 25,222us-gaap_HeldToMaturitySecurities	$ 29,905us-gaap_HeldToMaturitySecurities
Loans, net of allowance of loan losses	2,831,253	2,434,998
Time deposits	874,102us-gaap_TimeDeposits	790,762us-gaap_TimeDeposits
Federal Home Loan Bank advances	406,297	288,082
Junior subordinated debentures	22,681	22,681
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity securities	25,222	29,905
Loans, net of allowance of loan losses	2,831,253	2,434,998
Time deposits	874,102	790,762
Federal Home Loan Bank advances	406,297	288,082
Junior subordinated debentures	22,681	22,681
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity securities	26,008	29,865
Loans, net of allowance of loan losses	2,866,907	2,479,527
Time deposits	872,570	797,748
Federal Home Loan Bank advances	418,005	308,317
Junior subordinated debentures	17,201	16,282
Level 1 [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity securities	0	0
Loans, net of allowance of loan losses	0	0
Time deposits	0	0
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	0	0
Level 2 [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity securities	26,008	29,865
Loans, net of allowance of loan losses	0	0
Time deposits	872,570	797,748
Federal Home Loan Bank advances	418,005	308,317
Junior subordinated debentures	17,201	16,282
Level 3 [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity securities	0	0
Loans, net of allowance of loan losses	2,866,907	2,479,527
Time deposits	0	0
Federal Home Loan Bank advances	0	0
Junior subordinated debentures	$ 0	$ 0

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 470

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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