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Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Securities available for sale |  |
Amortized Cost | $ 303,845,000 | $ 301,854,000
Unrealized Gains | 859,000 | 1,872,000
Unrealized Losses | (4,532,000) | (3,310,000)
Fair Value (Estimated) | 300,172,000 | 300,416,000
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 256,567,000 | 226,828,000
Unrealized Gains | 4,499,000 | 2,973,000
Unrealized Losses | (1,411,000) | (4,264,000)
Fair Value (Estimated) | 259,655,000 | 225,537,000
Restricted equity securities, cost and FMV [Abstract] |  |
Amortized Cost | 10,358,000 | 11,930,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value Estimated | 10,358,000 | 11,930,000
Federal Home Loan Bank Stock |  |
Restricted equity securities, cost and FMV [Abstract] |  |
Amortized Cost | 9,321,000 | 10,893,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value Estimated | 9,321,000 | 10,893,000
Federal Reserve Bank Stock |  |
Restricted equity securities, cost and FMV [Abstract] |  |
Amortized Cost | 1,037,000 | 1,037,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value Estimated | 1,037,000 | 1,037,000
Mortgage-backed securities |  |
Securities available for sale |  |
Amortized Cost-Debt | 293,689,000 | 282,397,000
Unrealized Gains | 722,000 | 1,334,000
Unrealized Losses | (4,422,000) | (3,127,000)
Fair Value (Estimated) | 289,989,000 | 280,604,000
State and political subdivisions |  |
Securities available for sale |  |
Amortized Cost-Debt | 6,860,000 | 16,183,000
Unrealized Gains | 16,000 | 475,000
Unrealized Losses | (107,000) | (176,000)
Fair Value (Estimated) | 6,769,000 | 16,482,000
Other equity securities |  |
Securities available for sale |  |
Amortized Cost-Debt | 3,296,000 | 3,274,000
Unrealized Gains | 121,000 | 63,000
Unrealized Losses | (3,000) | (7,000)
Fair Value (Estimated) | 3,414,000 | 3,330,000
U.S. Government-sponsored agencies |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 11,155,000 | 11,943,000
Unrealized Gains | 0 | 35,000
Unrealized Losses | (180,000) | (233,000)
Fair Value (Estimated) | 10,975,000 | 11,745,000
Mortgage-backed securities |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 23,284,000 | 31,201,000
Unrealized Gains | 568,000 | 967,000
Unrealized Losses | (128,000) | (147,000)
Fair Value (Estimated) | 23,724,000 | 32,021,000
State and political subdivisions |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 217,828,000 | 179,384,000
Unrealized Gains | 3,931,000 | 1,971,000
Unrealized Losses | (1,103,000) | (3,884,000)
Fair Value (Estimated) | 220,656,000 | 177,471,000
Corporate securities |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 4,300,000 | 4,300,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value (Estimated) | $ 4,300,000 | $ 4,300,000

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