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Investment Securities Temporarily Impaired Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) $ 61,651 $ 244,393 $ 240,605
Unrealized Loss (Less than 12 months) (793) (25,629) (19,958)
Fair Value (Estimated) (12 months or more) 119,192 12,651 3,470
Unrealized Loss (12 months or more) (7,163) (1,681) (166)
Fair Value (Estimated) 180,843 257,044 244,075
Unrealized Losses (7,956) (27,310) (20,124)
US Treasury and Government [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 4,985 78,724 82,752
Unrealized Loss (Less than 12 months) (15) (12,757) (8,684)
Fair Value (Estimated) (12 months or more) 81,253 0 0
Unrealized Loss (12 months or more) (5,256) 0 0
Fair Value (Estimated) 86,238 78,724 82,752
Unrealized Losses (5,271) (12,757) (8,684)
Collateralized Mortgage Backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 52,644 96,263 84,609
Unrealized Loss (Less than 12 months) (736) (4,977) (2,514)
Fair Value (Estimated) (12 months or more) 32,009 5,451 3,086
Unrealized Loss (12 months or more) (1,630) (131) (133)
Fair Value (Estimated) 84,653 101,714 87,695
Unrealized Losses (2,366) (5,108) (2,647)
US States and Political Subdivisions Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 3,880 69,406 73,244
Unrealized Loss (Less than 12 months) (27) (7,895) (8,760)
Fair Value (Estimated) (12 months or more) 5,878 7,150 334
Unrealized Loss (12 months or more) (276) (1,548) (30)
Fair Value (Estimated) 9,758 76,556 73,578
Unrealized Losses (303) (9,443) (8,790)
Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 142 0 0
Unrealized Loss (Less than 12 months) (15) 0 0
Fair Value (Estimated) (12 months or more) 52 50 50
Unrealized Loss (12 months or more) (1) (2) (3)
Fair Value (Estimated) 194 50 50
Unrealized Losses $ (16) $ (2) $ (3)