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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)

X
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