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Investment Securities Temporarily Impaired Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) $ 47,558 $ 244,393 $ 215,897
Unrealized Loss (Less than 12 months) (739) (25,629) (15,841)
Fair Value (Estimated) (12 months or more) 163,912 12,651 1,695
Unrealized Loss (12 months or more) (10,237) (1,681) (107)
Fair Value (Estimated) 211,470 257,044 217,592
Unrealized Loss (10,976) (27,310) (15,948)
US Treasury and Government [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 0 78,724 85,453
Unrealized Loss (Less than 12 months) 0 (12,757) (5,944)
Fair Value (Estimated) (12 months or more) 85,167 0 0
Unrealized Loss (12 months or more) (6,343) 0 0
Fair Value (Estimated) 85,167 78,724 85,453
Unrealized Loss (6,343) (12,757) (5,944)
Collateralized Mortgage Backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 39,436 96,263 58,706
Unrealized Loss (Less than 12 months) (668) (4,977) (2,039)
Fair Value (Estimated) (12 months or more) 32,975 5,451 1,585
Unrealized Loss (12 months or more) (1,550) (131) (99)
Fair Value (Estimated) 72,411 101,714 60,291
Unrealized Loss (2,218) (5,108) (2,138)
US States and Political Subdivisions Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 8,122 69,406 71,738
Unrealized Loss (Less than 12 months) (71) (7,895) (7,858)
Fair Value (Estimated) (12 months or more) 45,718 7,150 0
Unrealized Loss (12 months or more) (2,343) (1,548) 0
Fair Value (Estimated) 53,840 76,556 71,738
Unrealized Loss (2,414) (9,443) (7,858)
Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 0 0 0
Unrealized Loss (Less than 12 months) 0 0 0
Fair Value (Estimated) (12 months or more) 52 50 110
Unrealized Loss (12 months or more) (1) (2) (8)
Fair Value (Estimated) 52 50 110
Unrealized Loss $ (1) $ (2) $ (8)