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Parent Company Only Condensed Financial Statements - Consolidated Statements of Cash Flow (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income available to common shareholders $ 27,173us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 33,104us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 25,101us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income to net cash provided by operating activities      
Share-based compensation 2,950us-gaap_ShareBasedCompensation 5,048us-gaap_ShareBasedCompensation 2,537us-gaap_ShareBasedCompensation
Excess tax benefit of share-based compensation (205)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (222)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (66)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net cash provided (used) by operating activities 31,494us-gaap_NetCashProvidedByUsedInOperatingActivities 29,308us-gaap_NetCashProvidedByUsedInOperatingActivities 37,373us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Net cash provided (used) by investing activities (212,826)us-gaap_NetCashProvidedByUsedInInvestingActivities 176,084us-gaap_NetCashProvidedByUsedInInvestingActivities (6,282)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Proceeds from notes payable 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 12,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of notes payable (4,800)us-gaap_RepaymentsOfLongTermDebt (1,200)us-gaap_RepaymentsOfLongTermDebt (300)us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs 0us-gaap_PaymentsOfDebtIssuanceCosts 0us-gaap_PaymentsOfDebtIssuanceCosts (45)us-gaap_PaymentsOfDebtIssuanceCosts
Cash dividends paid (4,177)us-gaap_PaymentsOfDividendsCommonStock (3,946)us-gaap_PaymentsOfDividendsCommonStock (3,757)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefit of share-based compensation 205us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 222us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 66us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payments for the repurchase of preferred stock 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock (35,000)us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
Dividends paid on preferred stock 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (1,711)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Issuance of common stock 2us-gaap_ProceedsFromIssuanceOfCommonStock 1us-gaap_ProceedsFromIssuanceOfCommonStock 3us-gaap_ProceedsFromIssuanceOfCommonStock
Common stock repurchased 0us-gaap_PaymentsForRepurchaseOfWarrants (1,006)us-gaap_PaymentsForRepurchaseOfWarrants 0us-gaap_PaymentsForRepurchaseOfWarrants
Proceeds from the issuance of equity instruments, net (681)us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 2,264us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,558us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Net cash provided (used) by financing activities 71,459us-gaap_NetCashProvidedByUsedInFinancingActivities (111,193)us-gaap_NetCashProvidedByUsedInFinancingActivities (102,864)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents (109,873)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 94,199us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (71,773)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 210,569us-gaap_CashAndCashEquivalentsAtCarryingValue 116,370us-gaap_CashAndCashEquivalentsAtCarryingValue 188,143us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 100,696us-gaap_CashAndCashEquivalentsAtCarryingValue 210,569us-gaap_CashAndCashEquivalentsAtCarryingValue 116,370us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent [Member]      
Cash flows from operating activities:      
Net income available to common shareholders 27,173us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
33,104us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
28,296us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities      
Share-based compensation 2,950us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,049us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,537us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income of subsidiaries (30,560)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(37,876)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(33,383)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends from subsidiaries 10,000us-gaap_ProceedsFromDividendsReceived
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,000us-gaap_ProceedsFromDividendsReceived
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,000us-gaap_ProceedsFromDividendsReceived
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefit of share-based compensation (205)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(222)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(66)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other, net 704us-gaap_OtherOperatingActivitiesCashFlowStatement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,004us-gaap_OtherOperatingActivitiesCashFlowStatement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,064us-gaap_OtherOperatingActivitiesCashFlowStatement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided (used) by operating activities 10,062us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,059us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
14,448us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from investing activities:      
Purchases of other investments (2,224)us-gaap_PaymentsToAcquireInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(761)us-gaap_PaymentsToAcquireInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(970)us-gaap_PaymentsToAcquireInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from distributions on other investments 176us-gaap_ProceedsFromInterestAndDividendsReceived
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
243us-gaap_ProceedsFromInterestAndDividendsReceived
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
541us-gaap_ProceedsFromInterestAndDividendsReceived
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided (used) by investing activities (2,048)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(518)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(429)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from financing activities:      
Proceeds from notes payable 0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayments of notes payable (4,800)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,200)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(300)us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Debt issuance costs 0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(45)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash dividends paid (4,177)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,947)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,757)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefit of share-based compensation 205us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
222us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
66us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Payments for the repurchase of preferred stock 0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(35,000)us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends paid on preferred stock 0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,711)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Issuance of common stock 2us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Common stock repurchased 0us-gaap_PaymentsForRepurchaseOfWarrants
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,006)us-gaap_PaymentsForRepurchaseOfWarrants
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsForRepurchaseOfWarrants
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from the issuance of equity instruments, net (681)us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,266us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,558us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided (used) by financing activities (9,451)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,652)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(27,186)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net increase (decrease) in cash and cash equivalents (1,437)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
7,889us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(13,167)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of period 15,969us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,080us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
21,247us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period $ 14,532us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 15,969us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 8,080us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember