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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 92,015 | $ 17,298 | $ 61,651
Unrealized Loss (Less than 12 months) | (1,522) | (74) | (793)
Fair Value (Estimated) (12 months or more) | 20,858 | 111,694 | 119,192
Unrealized Loss (12 months or more) | (751) | (2,825) | (7,163)
Fair Value (Estimated) | 112,873 | 128,992 | 180,843
Unrealized Losses | (2,273) | (2,899) | (7,956)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 46,621 | 0 | 4,985
Unrealized Loss (Less than 12 months) | (1,015) | 0 | (15)
Fair Value (Estimated) (12 months or more) | 17,444 | 79,444 | 81,253
Unrealized Loss (12 months or more) | (556) | (2,066) | (5,256)
Fair Value (Estimated) | 64,065 | 79,444 | 86,238
Unrealized Losses | (1,571) | (2,066) | (5,271)
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 30,713 | 13,878 | 52,644
Unrealized Loss (Less than 12 months) | (266) | (40) | (736)
Fair Value (Estimated) (12 months or more) | 989 | 29,182 | 32,009
Unrealized Loss (12 months or more) | (63) | (654) | (1,630)
Fair Value (Estimated) | 31,702 | 43,060 | 84,653
Unrealized Losses | (329) | (694) | (2,366)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 14,417 | 3,352 | 3,880
Unrealized Loss (Less than 12 months) | (207) | (31) | (27)
Fair Value (Estimated) (12 months or more) | 2,374 | 3,017 | 5,878
Unrealized Loss (12 months or more) | (130) | (104) | (276)
Fair Value (Estimated) | 16,791 | 6,369 | 9,758
Unrealized Losses | (337) | (135) | (303)
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 264 | 68 | 142
Unrealized Loss (Less than 12 months) | (34) | (3) | (15)
Fair Value (Estimated) (12 months or more) | 51 | 51 | 52
Unrealized Loss (12 months or more) | (2) | (1) | (1)
Fair Value (Estimated) | 315 | 119 | 194
Unrealized Losses | $ (36) | $ (4) | $ (16)

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