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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities | The following table summarizes the amortized cost and estimated fair value of investment securities at September 30, 2018:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
U.S. government-sponsored agencies | $ | 5,000,000 |  |  | $ | — |  |  | $ | (21,000 | ) |  | $ | 4,979,000 |
Mortgage-backed securities | 303,793,000 |  |  | 77,000 |  |  | (11,300,000 | ) |  | 292,570,000 |
State and political subdivisions | 4,955,000 |  |  | — |  |  | (317,000 | ) |  | 4,638,000 |
Other equity securities | 3,257,000 |  |  | — |  |  | — |  |  | 3,257,000 |
| $ | 317,005,000 |  |  | $ | 77,000 |  |  | $ | (11,638,000 | ) |  | $ | 305,444,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,155,000 |  |  | $ | — |  |  | $ | (767,000 | ) |  | $ | 10,388,000 |
Mortgage-backed securities | 19,244,000 |  |  | 326,000 |  |  | (460,000 | ) |  | 19,110,000 |
State and political subdivisions | 222,696,000 |  |  | 639,000 |  |  | (7,243,000 | ) |  | 216,092,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 257,395,000 |  |  | $ | 965,000 |  |  | $ | (8,470,000 | ) |  | $ | 249,890,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 10,549,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,549,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 11,586,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,586,000 |
The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2017:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 293,689,000 |  |  | $ | 722,000 |  |  | $ | (4,422,000 | ) |  | $ | 289,989,000 |
State and political subdivisions | 6,860,000 |  |  | 16,000 |  |  | (107,000 | ) |  | 6,769,000 |
Other equity securities | 3,296,000 |  |  | 121,000 |  |  | (3,000 | ) |  | 3,414,000 |
| $ | 303,845,000 |  |  | $ | 859,000 |  |  | $ | (4,532,000 | ) |  | $ | 300,172,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,155,000 |  |  | $ | — |  |  | $ | (180,000 | ) |  | $ | 10,975,000 |
Mortgage-backed securities | 23,284,000 |  |  | 568,000 |  |  | (128,000 | ) |  | 23,724,000 |
State and political subdivisions | 217,828,000 |  |  | 3,931,000 |  |  | (1,103,000 | ) |  | 220,656,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 256,567,000 |  |  | $ | 4,499,000 |  |  | $ | (1,411,000 | ) |  | $ | 259,655,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 9,321,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,321,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 10,358,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,358,000 |
The following table summarizes the amortized cost and estimated fair value of investment securities at September 30, 2017:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 290,151,000 |  |  | $ | 1,339,000 |  |  | $ | (2,701,000 | ) |  | $ | 288,789,000 |
State and political subdivisions | 6,860,000 |  |  | 28,000 |  |  | (46,000 | ) |  | 6,842,000 |
Other equity securities | 3,257,000 |  |  | 113,000 |  |  | (2,000 | ) |  | 3,368,000 |
| $ | 300,268,000 |  |  | $ | 1,480,000 |  |  | $ | (2,749,000 | ) |  | $ | 298,999,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,154,000 |  |  | $ | — |  |  | $ | (197,000 | ) |  | $ | 10,957,000 |
Mortgage-backed securities | 24,993,000 |  |  | 731,000 |  |  | (40,000 | ) |  | 25,684,000 |
State and political subdivisions | 202,232,000 |  |  | 3,640,000 |  |  | (1,792,000 | ) |  | 204,080,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 242,679,000 |  |  | $ | 4,371,000 |  |  | $ | (2,029,000 | ) |  | $ | 245,021,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 9,761,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,761,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 10,798,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,798,000 |
Contractual Maturities of Investment Securities | The following table summarizes the contractual maturities of investment securities at September 30, 2018:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | — |  |  | $ | — |  |  | $ | 1,796,000 |  |  | $ | 1,800,000 |
Due in 1 to 5 years | 13,961,000 |  |  | 13,886,000 |  |  | 21,463,000 |  |  | 21,468,000 |
Due in 5 to 10 years | 69,317,000 |  |  | 67,434,000 |  |  | 155,997,000 |  |  | 152,154,000 |
Due after 10 years | 230,470,000 |  |  | 220,867,000 |  |  | 78,139,000 |  |  | 74,468,000 |
Equity securities | 3,257,000 |  |  | 3,257,000 |  |  | — |  |  | — |
| $ | 317,005,000 |  |  | $ | 305,444,000 |  |  | $ | 257,395,000 |  |  | $ | 249,890,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 2017:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 111,000 |  |  | $ | 112,000 |  |  | $ | 635,000 |  |  | $ | 637,000 |
Due in 1 to 5 years | 841,000 |  |  | 842,000 |  |  | 18,059,000 |  |  | 18,164,000 |
Due in 5 to 10 years | 29,003,000 |  |  | 29,177,000 |  |  | 37,182,000 |  |  | 37,719,000 |
Due after 10 years | 270,594,000 |  |  | 266,627,000 |  |  | 200,691,000 |  |  | 203,135,000 |
Equity securities | 3,296,000 |  |  | 3,414,000 |  |  | — |  |  | — |
| $ | 303,845,000 |  |  | $ | 300,172,000 |  |  | $ | 256,567,000 |  |  | $ | 259,655,000 |
The following table summarizes the contractual maturities of investment securities at September 30, 2017:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 176,000 |  |  | $ | 179,000 |  |  | $ | 552,000 |  |  | $ | 559,000 |
Due in 1 to 5 years | 856,000 |  |  | 859,000 |  |  | 17,241,000 |  |  | 17,485,000 |
Due in 5 to 10 years | 33,550,000 |  |  | 33,987,000 |  |  | 37,218,000 |  |  | 37,963,000 |
Due after 10 years | 262,429,000 |  |  | 260,606,000 |  |  | 187,668,000 |  |  | 189,014,000 |
Equity securities | 3,257,000 |  |  | 3,368,000 |  |  | — |  |  | — |
| $ | 300,268,000 |  |  | $ | 298,999,000 |  |  | $ | 242,679,000 |  |  | $ | 245,021,000 |
Schedule of Securities Gains and Losses | The following table shows securities gains and losses for the nine months and quarters ended September 30, 2018 and 2017:
| For the nine months ended September 30, |  | For the quarter ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Proceeds from sales of securities | $ | 459,000 |  |  | $ | 15,587,000 |  |  | $ | — |  |  | $ | 15,584,000 |
Gross realized gains | 137,000 |  |  | 471,000 |  |  | 1,000 |  |  | 468,000 |
Gross realized losses | — |  |  | — |  |  | — |  |  | — |
Net gain | $ | 137,000 |  |  | $ | 471,000 |  |  | $ | 1,000 |  |  | $ | 468,000 |
Related income taxes | $ | 29,000 |  |  | $ | 165,000 |  |  | $ | — |  |  | $ | 164,000 |
Schedule of Securities Temporarily Impaired | Information regarding securities temporarily impaired as of September 30, 2018 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses
U.S. Government-sponsored agencies | $ | 7,753,000 |  |  | $ | (247,000 | ) |  | $ | 7,614,000 |  |  | $ | (541,000 | ) |  | $ | 15,367,000 |  |  | $ | (788,000 | )
Mortgage-backed securities | 154,611,000 |  |  | (4,333,000 | ) |  | 143,771,000 |  |  | (7,427,000 | ) |  | 298,382,000 |  |  | (11,760,000 | )
State and political subdivisions | 105,233,000 |  |  | (3,255,000 | ) |  | 38,491,000 |  |  | (4,305,000 | ) |  | 143,724,000 |  |  | (7,560,000 | )
| $ | 267,597,000 |  |  | $ | (7,835,000 | ) |  | $ | 189,876,000 |  |  | $ | (12,273,000 | ) |  | $ | 457,473,000 |  |  | $ | (20,108,000 | )
As of December 31, 2017, there were 241 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 157 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2017 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses
U.S. Government-sponsored agencies | $ | 7,161,000 |  |  | $ | (94,000 | ) |  | $ | 3,814,000 |  |  | $ | (86,000 | ) |  | $ | 10,975,000 |  |  | $ | (180,000 | )
Mortgage-backed securities | 132,025,000 |  |  | (1,857,000 | ) |  | 101,707,000 |  |  | (2,693,000 | ) |  | 233,732,000 |  |  | (4,550,000 | )
State and political subdivisions | 9,425,000 |  |  | (149,000 | ) |  | 38,864,000 |  |  | (1,061,000 | ) |  | 48,289,000 |  |  | (1,210,000 | )
Other equity securities | — |  |  | — |  |  | 9,000 |  |  | (3,000 | ) |  | 9,000 |  |  | (3,000 | )
| $ | 148,611,000 |  |  | $ | (2,100,000 | ) |  | $ | 144,394,000 |  |  | $ | (3,843,000 | ) |  | $ | 293,005,000 |  |  | $ | (5,943,000 | )
As of September 30, 2017, there were 229 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 61 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of September 30, 2017 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses
U.S. Government-sponsored agencies | $ | 7,958,000 |  |  | $ | (197,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 7,958,000 |  |  | $ | (197,000 | )
Mortgage-backed securities | 147,326,000 |  |  | (1,635,000 | ) |  | 48,015,000 |  |  | (1,106,000 | ) |  | 195,341,000 |  |  | (2,741,000 | )
State and political subdivisions | 39,407,000 |  |  | (1,186,000 | ) |  | 12,583,000 |  |  | (652,000 | ) |  | 51,990,000 |  |  | (1,838,000 | )
Other equity securities | — |  |  | — |  |  | 10,000 |  |  | (2,000 | ) |  | 10,000 |  |  | (2,000 | )
| $ | 194,691,000 |  |  | $ | (3,018,000 | ) |  | $ | 60,608,000 |  |  | $ | (1,760,000 | ) |  | $ | 255,299,000 |  |  | $ | (4,778,000 | )

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