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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