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Investment Securities Temporarily Impaired Securities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) $ 214,539 $ 89,296 $ 244,393
Unrealized Losses (Less than 12 months) (14,560) (1,910) (25,629)
Fair Value (Estimated) (12 months or more) 33,293 1,934 12,651
Unrealized Losses (12 months or more) (2,953) (121) (1,681)
Fair Value (Estimated) 247,832 91,230 257,044
Unrealized Losses (17,513) (2,031) (27,310)
US Treasury and Government [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 82,374 35,681 78,724
Unrealized Losses (Less than 12 months) (9,131) (289) (12,757)
Fair Value (Estimated) (12 months or more) 0 0 0
Unrealized Losses (12 months or more) 0 0 0
Fair Value (Estimated) 82,374 35,681 78,724
Unrealized Losses (9,131) (289) (12,757)
Collateralized Mortgage Backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 81,618 23,546 96,263
Unrealized Losses (Less than 12 months) (2,758) (457) (4,977)
Fair Value (Estimated) (12 months or more) 14,324 1,652 5,451
Unrealized Losses (12 months or more) (742) (69) (131)
Fair Value (Estimated) 95,942 25,198 101,714
Unrealized Losses (3,500) (526) (5,108)
US States and Political Subdivisions Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 50,480 30,069 69,406
Unrealized Losses (Less than 12 months) (2,669) (1,164) (7,895)
Fair Value (Estimated) (12 months or more) 18,918 0 7,150
Unrealized Losses (12 months or more) (2,210) 0 (1,548)
Fair Value (Estimated) 69,398 30,069 76,556
Unrealized Losses (4,879) (1,164) (9,443)
Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 67 0 0
Unrealized Losses (Less than 12 months) (2) 0 0
Fair Value (Estimated) (12 months or more) 51 282 50
Unrealized Losses (12 months or more) (1) (52) (2)
Fair Value (Estimated) 118 282 50
Unrealized Losses $ (3) $ (52) $ (2)