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Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Securities available for sale |  |
Amortized Cost | $ 301,854,000 | $ 221,311,000
Unrealized Gains | 1,872,000 | 2,758,000
Unrealized Losses | (3,310,000) | (1,030,000)
Fair Value (Estimated) | 300,416,000 | 223,039,000
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 226,828,000 | 240,023,000
Unrealized Gains | 2,973,000 | 5,545,000
Unrealized Losses | (4,264,000) | (2,445,000)
Fair Value (Estimated) | 225,537,000 | 243,123,000
Restricted equity securities, cost and FMV [Abstract] |  |
Amortized Cost | 11,930,000 | 14,257,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value Estimated | 11,930,000 | 14,257,000
Federal Home Loan Bank Stock |  |
Restricted equity securities, cost and FMV [Abstract] |  |
Amortized Cost | 10,893,000 | 13,220,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value Estimated | 10,893,000 | 13,220,000
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 | 282,397,000 | 194,563,000
Unrealized Gains | 1,334,000 | 1,509,000
Unrealized Losses | (3,127,000) | (962,000)
Fair Value (Estimated) | 280,604,000 | 195,110,000
State and political subdivisions |  |
Securities available for sale |  |
Amortized Cost-Debt | 16,183,000 | 23,367,000
Unrealized Gains | 475,000 | 1,201,000
Unrealized Losses | (176,000) | (62,000)
Fair Value (Estimated) | 16,482,000 | 24,506,000
Other equity securities |  |
Securities available for sale |  |
Amortized Cost-Debt | 3,274,000 | 3,381,000
Unrealized Gains | 63,000 | 48,000
Unrealized Losses | (7,000) | (6,000)
Fair Value (Estimated) | 3,330,000 | 3,423,000
U.S. Government-sponsored agencies |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 11,943,000 | 71,000,000
Unrealized Gains | 35,000 | 40,000
Unrealized Losses | (233,000) | (2,284,000)
Fair Value (Estimated) | 11,745,000 | 68,756,000
Mortgage-backed securities |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 31,201,000 | 42,193,000
Unrealized Gains | 967,000 | 1,305,000
Unrealized Losses | (147,000) | (136,000)
Fair Value (Estimated) | 32,021,000 | 43,362,000
State and political subdivisions |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |
Amortized Cost | 179,384,000 | 122,530,000
Unrealized Gains | 1,971,000 | 4,200,000
Unrealized Losses | (3,884,000) | (25,000)
Fair Value (Estimated) | 177,471,000 | 126,705,000
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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