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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) (USD $) In Thousands, except Per 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
UNAUDITED QUARTERLY FINANCIAL INFORMATION |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 37,741 us-gaap_InterestAndDividendIncomeOperating | $ 37,139 us-gaap_InterestAndDividendIncomeOperating | $ 37,536 us-gaap_InterestAndDividendIncomeOperating | $ 37,393 us-gaap_InterestAndDividendIncomeOperating | $ 37,133 us-gaap_InterestAndDividendIncomeOperating | $ 35,558 us-gaap_InterestAndDividendIncomeOperating | $ 34,992 us-gaap_InterestAndDividendIncomeOperating | $ 32,595 us-gaap_InterestAndDividendIncomeOperating | $ 149,809 us-gaap_InterestAndDividendIncomeOperating | $ 140,278 us-gaap_InterestAndDividendIncomeOperating | $ 128,445 us-gaap_InterestAndDividendIncomeOperating
Total interest expense | 1,557 us-gaap_InterestExpense | 1,607 us-gaap_InterestExpense | 1,630 us-gaap_InterestExpense | 1,597 us-gaap_InterestExpense | 1,637 us-gaap_InterestExpense | 1,787 us-gaap_InterestExpense | 1,819 us-gaap_InterestExpense | 1,926 us-gaap_InterestExpense | 6,391 us-gaap_InterestExpense | 7,169 us-gaap_InterestExpense | 8,734 us-gaap_InterestExpense
Net interest income | 36,184 us-gaap_InterestIncomeExpenseNet | 35,532 us-gaap_InterestIncomeExpenseNet | 35,906 us-gaap_InterestIncomeExpenseNet | 35,796 us-gaap_InterestIncomeExpenseNet | 35,496 us-gaap_InterestIncomeExpenseNet | 33,771 us-gaap_InterestIncomeExpenseNet | 33,173 us-gaap_InterestIncomeExpenseNet | 30,669 us-gaap_InterestIncomeExpenseNet | 143,418 us-gaap_InterestIncomeExpenseNet | 133,109 us-gaap_InterestIncomeExpenseNet | 119,711 us-gaap_InterestIncomeExpenseNet
Provision (credit) for loan and lease losses | (5,371)us-gaap_ProvisionForLoanAndLeaseLosses | (1,722)us-gaap_ProvisionForLoanAndLeaseLosses | 1,995 us-gaap_ProvisionForLoanAndLeaseLosses | (1,316)us-gaap_ProvisionForLoanAndLeaseLosses | (1,333)us-gaap_ProvisionForLoanAndLeaseLosses | (3,189)us-gaap_ProvisionForLoanAndLeaseLosses | (227)us-gaap_ProvisionForLoanAndLeaseLosses | (6,561)us-gaap_ProvisionForLoanAndLeaseLosses | (6,414)us-gaap_ProvisionForLoanAndLeaseLosses | (11,310)us-gaap_ProvisionForLoanAndLeaseLosses | (18,885)us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan and lease losses | 41,555 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 37,254 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 33,911 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 37,112 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 36,829 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 36,960 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 33,400 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 37,230 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 149,832 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 144,419 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 138,596 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Investment securities gains |  |  | 240 us-gaap_GainLossOnSaleOfSecuritiesNet |  | 482 us-gaap_GainLossOnSaleOfSecuritiesNet |  |  |  | 240 us-gaap_GainLossOnSaleOfSecuritiesNet | 482 us-gaap_GainLossOnSaleOfSecuritiesNet | 789 us-gaap_GainLossOnSaleOfSecuritiesNet
Income before income taxes | 19,018 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 13,471 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 13,027 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 15,326 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 13,731 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 12,378 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 16,212 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 17,507 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 60,842 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 59,828 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 47,421 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Net income | $ 13,265 us-gaap_NetIncomeLoss | $ 8,230 us-gaap_NetIncomeLoss | $ 9,150 us-gaap_NetIncomeLoss | $ 9,808 us-gaap_NetIncomeLoss | $ 10,295 us-gaap_NetIncomeLoss | $ 10,204 us-gaap_NetIncomeLoss | $ 14,267 us-gaap_NetIncomeLoss | $ 137,309 us-gaap_NetIncomeLoss | $ 40,453 us-gaap_NetIncomeLoss | $ 172,075 us-gaap_NetIncomeLoss | $ 47,421 us-gaap_NetIncomeLoss
Basic earnings per share (in dollars per share) | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ 3.28 us-gaap_EarningsPerShareBasic | $ 1.08 us-gaap_EarningsPerShareBasic | $ 4.10 us-gaap_EarningsPerShareBasic | $ 1.14 us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.24 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 3.25 us-gaap_EarningsPerShareDiluted | $ 1.07 us-gaap_EarningsPerShareDiluted | $ 4.07 us-gaap_EarningsPerShareDiluted | $ 1.13 us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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