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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 21,984 | $ 168,818 | $ 216,760
Unrealized Loss (Less than 12 months) | (183) | (2,525) | (4,477)
Fair Value (Estimated) (12 months or more) | 2,708 | 21,048 | 20,497
Unrealized Loss (12 months or more) | (110) | (950) | (1,333)
Fair Value (Estimated) | 24,692 | 189,866 | 237,257
Unrealized Losses | (293) | (3,475) | (5,810)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) |  | 45,311 | 55,147
Unrealized Loss (Less than 12 months) |  | (1,469) | (1,988)
Fair Value (Estimated) (12 months or more) |  | 17,185 | 16,953
Unrealized Loss (12 months or more) |  | (815) | (1,047)
Fair Value (Estimated) |  | 62,496 | 72,100
Unrealized Losses |  | (2,284) | (3,035)
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 21,849 | 120,915 | 89,332
Unrealized Loss (Less than 12 months) | (168) | (1,027) | (1,280)
Fair Value (Estimated) (12 months or more) | 2,615 | 910 | 1,194
Unrealized Loss (12 months or more) | (80) | (71) | (80)
Fair Value (Estimated) | 24,464 | 121,825 | 90,526
Unrealized Losses | (248) | (1,098) | (1,360)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) |  | 2,528 | 72,217
Unrealized Loss (Less than 12 months) |  | (24) | (1,202)
Fair Value (Estimated) (12 months or more) |  | 2,901 | 2,299
Unrealized Loss (12 months or more) |  | (63) | (205)
Fair Value (Estimated) |  | 5,429 | 74,516
Unrealized Losses |  | (87) | (1,407)
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 135 | 64 | 64
Unrealized Loss (Less than 12 months) | (15) | (5) | (7)
Fair Value (Estimated) (12 months or more) | 93 | 52 | 51
Unrealized Loss (12 months or more) | (30) | (1) | (1)
Fair Value (Estimated) | 228 | 116 | 115
Unrealized Losses | $ (45) | $ (6) | $ (8)

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