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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 287,408 | $ 276,518 | $ 17,882
Unrealized Loss (Less than 12 months) | (7,644) | (7,383) | (176)
Fair Value (Estimated) (12 months or more) | 2,494 | 3,033 | 8,282
Unrealized Loss (12 months or more) | (150) | (191) | (213)
Fair Value (Estimated) | 289,902 | 279,551 | 26,164
Unrealized Losses | (7,794) | (7,574) | (389)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 10,824 | 6,642 | 0
Unrealized Loss (Less than 12 months) | (317) | (233) | 0
Fair Value (Estimated) (12 months or more) | 0 | 0 | 4,893
Unrealized Loss (12 months or more) | 0 | 0 | (107)
Fair Value (Estimated) | 10,824 | 6,642 | 4,893
Unrealized Losses | (317) | (233) | (107)
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 198,068 | 197,528 | 17,125
Unrealized Loss (Less than 12 months) | (3,193) | (3,090) | (170)
Fair Value (Estimated) (12 months or more) | 2,432 | 2,905 | 1,866
Unrealized Loss (12 months or more) | (146) | (184) | (70)
Fair Value (Estimated) | 200,500 | 200,433 | 18,991
Unrealized Losses | (3,339) | (3,274) | (240)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 78,516 | 72,348 | 522
Unrealized Loss (Less than 12 months) | (4,134) | (4,060) | 0
Fair Value (Estimated) (12 months or more) | 0 | 0 | 1,417
Unrealized Loss (12 months or more) | 0 | 0 | (19)
Fair Value (Estimated) | 78,516 | 72,348 | 1,939
Unrealized Losses | (4,134) | (4,060) | (19)
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 0 | 235
Unrealized Loss (Less than 12 months) | 0 | 0 | (6)
Fair Value (Estimated) (12 months or more) | 62 | 128 | 106
Unrealized Loss (12 months or more) | (4) | (7) | (17)
Fair Value (Estimated) | 62 | 128 | 341
Unrealized Losses | $ (4) | $ (7) | $ (23)

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