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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 234,959 | $ 276,518 | $ 21,984
Unrealized Losses (Less than 12 months) | (4,910) | (7,383) | (183)
Fair Value (Estimated) (12 months or more) | 7,652 | 3,033 | 2,708
Unrealized Losses (12 months or more) | (200) | (191) | (110)
Fair Value (Estimated) | 242,611 | 279,551 | 24,692
Unrealized Losses | (5,110) | (7,574) | (293)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 7,972 | 6,642 |
Unrealized Losses (Less than 12 months) | (181) | (233) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 7,972 | 6,642 |
Unrealized Losses | (181) | (233) |
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 170,966 | 197,528 | 21,849
Unrealized Losses (Less than 12 months) | (2,613) | (3,090) | (168)
Fair Value (Estimated) (12 months or more) | 7,643 | 2,905 | 2,615
Unrealized Losses (12 months or more) | (197) | (184) | (80)
Fair Value (Estimated) | 178,609 | 200,433 | 24,464
Unrealized Losses | (2,810) | (3,274) | (248)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 55,952 | 72,348 |
Unrealized Losses (Less than 12 months) | (2,115) | (4,060) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 55,952 | 72,348 |
Unrealized Losses | (2,115) | (4,060) |
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 69 | 0 | 135
Unrealized Losses (Less than 12 months) | (1) | 0 | (15)
Fair Value (Estimated) (12 months or more) | 9 | 128 | 93
Unrealized Losses (12 months or more) | (3) | (7) | (30)
Fair Value (Estimated) | 78 | 128 | 228
Unrealized Losses | $ (4) | $ (7) | $ (45)

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