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Condensed Financial Statements of Parent Company (Statements of Income) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 74,916 | $ 72,035 | $ 69,379 | $ 66,743 | $ 66,932 | $ 65,455 | $ 66,943 | $ 68,555 | $ 283,073 | $ 267,885 | $ 161,895
Interest expense | 8,040 | 7,675 | 7,276 | 7,027 | 7,286 | 7,224 | 7,441 | 7,696 | 30,018 | 29,647 | 32,077
Income tax provision | (11,047) | (15,117) | (14,821) | (11,414) | (14,947) | (11,827) | (12,101) | (15,535) | (52,399) | (54,410) | (15,660)
NET INCOME | 18,071 | 23,552 | 22,671 | 17,461 | 21,527 | 18,398 | 19,364 | 23,934 | 81,755 | 83,223 | 27,115
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 1,798 | 2,064 | 1,906
Dividends from bank subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operating expense |  |  |  |  |  |  |  |  | 4,499 | 7,147 | 5,024
Equity in earnings of bank subsidiary |  |  |  |  |  |  |  |  | 85,854 | 88,793 | 31,508
Income before income tax benefit |  |  |  |  |  |  |  |  | 79,557 | 79,582 | 24,578
Income tax provision |  |  |  |  |  |  |  |  | 2,198 | 3,641 | 2,537
NET INCOME |  |  |  |  |  |  |  |  | $ 81,755 | $ 83,223 | $ 27,115

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -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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