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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 216,760 | $ 17,298 | $ 47,558
Unrealized Loss (Less than 12 months) | (4,477) | (74) | (739)
Fair Value (Estimated) (12 months or more) | 20,497 | 111,694 | 163,912
Unrealized Loss (12 months or more) | (1,333) | (2,825) | (10,237)
Fair Value (Estimated) | 237,257 | 128,992 | 211,470
Unrealized Losses | (5,810) | (2,899) | (10,976)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 55,147 | 0 | 0
Unrealized Loss (Less than 12 months) | (1,988) | 0 | 0
Fair Value (Estimated) (12 months or more) | 16,953 | 79,444 | 85,167
Unrealized Loss (12 months or more) | (1,047) | (2,066) | (6,343)
Fair Value (Estimated) | 72,100 | 79,444 | 85,167
Unrealized Losses | (3,035) | (2,066) | (6,343)
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 89,332 | 13,878 | 39,436
Unrealized Loss (Less than 12 months) | (1,280) | (40) | (668)
Fair Value (Estimated) (12 months or more) | 1,194 | 29,182 | 32,975
Unrealized Loss (12 months or more) | (80) | (654) | (1,550)
Fair Value (Estimated) | 90,526 | 43,060 | 72,411
Unrealized Losses | (1,360) | (694) | (2,218)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 72,217 | 3,352 | 8,122
Unrealized Loss (Less than 12 months) | (1,202) | (31) | (71)
Fair Value (Estimated) (12 months or more) | 2,299 | 3,017 | 45,718
Unrealized Loss (12 months or more) | (205) | (104) | (2,343)
Fair Value (Estimated) | 74,516 | 6,369 | 53,840
Unrealized Losses | (1,407) | (135) | (2,414)
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 64 | 68 | 0
Unrealized Loss (Less than 12 months) | (7) | (3) | 0
Fair Value (Estimated) (12 months or more) | 51 | 51 | 52
Unrealized Loss (12 months or more) | (1) | (1) | (1)
Fair Value (Estimated) | 115 | 119 | 52
Unrealized Losses | $ (8) | $ (4) | $ (1)

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