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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 194,691 | $ 276,518 | $ 92,794
Unrealized Losses (Less than 12 months) | (3,018) | (7,383) | (640)
Fair Value (Estimated) (12 months or more) | 60,608 | 3,033 | 2,514
Unrealized Losses (12 months or more) | (1,760) | (191) | (95)
Fair Value (Estimated) | 255,299 | 279,551 | 95,308
Unrealized Losses | (4,778) | (7,574) | (735)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 7,958 | 6,642 |
Unrealized Losses (Less than 12 months) | (197) | (233) |
Fair Value (Estimated) (12 months or more) | 0 | 0 |
Unrealized Losses (12 months or more) | 0 | 0 |
Fair Value (Estimated) | 7,958 | 6,642 |
Unrealized Losses | (197) | (233) |
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 147,326 | 197,528 | 79,118
Unrealized Losses (Less than 12 months) | (1,635) | (3,090) | (468)
Fair Value (Estimated) (12 months or more) | 48,015 | 2,905 | 2,407
Unrealized Losses (12 months or more) | (1,106) | (184) | (79)
Fair Value (Estimated) | 195,341 | 200,433 | 81,525
Unrealized Losses | (2,741) | (3,274) | (547)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 39,407 | 72,348 | 13,666
Unrealized Losses (Less than 12 months) | (1,186) | (4,060) | (170)
Fair Value (Estimated) (12 months or more) | 12,583 | 0 | 0
Unrealized Losses (12 months or more) | (652) | 0 | 0
Fair Value (Estimated) | 51,990 | 72,348 | 13,666
Unrealized Losses | (1,838) | (4,060) | (170)
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 0 | 10
Unrealized Losses (Less than 12 months) | 0 | 0 | (2)
Fair Value (Estimated) (12 months or more) | 10 | 128 | 107
Unrealized Losses (12 months or more) | (2) | (7) | (16)
Fair Value (Estimated) | 10 | 128 | 117
Unrealized Losses | $ (2) | $ (7) | $ (18)

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