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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31, 2019:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 5,000,000 |  |  | $ | 16,000 |  |  | $ | — |  |  | $ | 5,016,000 |
Mortgage-backed securities | 317,269,000 |  |  | 1,394,000 |  |  | (3,240,000 | ) |  | 315,423,000 |
State and political subdivisions | 4,955,000 |  |  | 4,000 |  |  | (122,000 | ) |  | 4,837,000 |
| $ | 327,224,000 |  |  | $ | 1,414,000 |  |  | $ | (3,362,000 | ) |  | $ | 325,276,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 31,155,000 |  |  | $ | 48,000 |  |  | $ | (280,000 | ) |  | $ | 30,923,000 |
Mortgage-backed securities | 17,560,000 |  |  | 372,000 |  |  | (146,000 | ) |  | 17,786,000 |
State and political subdivisions | 225,204,000 |  |  | 3,162,000 |  |  | (1,801,000 | ) |  | 226,565,000 |
Corporate securities | 7,300,000 |  |  | — |  |  | (6,000 | ) |  | 7,294,000 |
| $ | 281,219,000 |  |  | $ | 3,582,000 |  |  | $ | (2,233,000 | ) |  | $ | 282,568,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 7,945,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,945,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 8,982,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,982,000 |
The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2018:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 5,000,000 |  |  | $ | 7,000 |  |  | $ | — |  |  | $ | 5,007,000 |
Mortgage-backed securities | 313,854,000 |  |  | 571,000 |  |  | (6,732,000 | ) |  | 307,693,000 |
State and political subdivisions | 4,955,000 |  |  | — |  |  | (239,000 | ) |  | 4,716,000 |
| $ | 323,809,000 |  |  | $ | 578,000 |  |  | $ | (6,971,000 | ) |  | $ | 317,416,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,155,000 |  |  | $ | — |  |  | $ | (472,000 | ) |  | $ | 10,683,000 |
Mortgage-backed securities | 18,250,000 |  |  | 336,000 |  |  | (255,000 | ) |  | 18,331,000 |
State and political subdivisions | 221,958,000 |  |  | 1,046,000 |  |  | (5,418,000 | ) |  | 217,586,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 255,663,000 |  |  | $ | 1,382,000 |  |  | $ | (6,145,000 | ) |  | $ | 250,900,000 |
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 March 31, 2018:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 302,935,000 |  |  | $ | 191,000 |  |  | $ | (7,798,000 | ) |  | $ | 295,328,000 |
State and political subdivisions | 5,765,000 |  |  | 3,000 |  |  | (257,000 | ) |  | 5,511,000 |
| $ | 308,700,000 |  |  | $ | 194,000 |  |  | $ | (8,055,000 | ) |  | $ | 300,839,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,155,000 |  |  | $ | — |  |  | $ | (515,000 | ) |  | $ | 10,640,000 |
Mortgage-backed securities | 21,990,000 |  |  | 469,000 |  |  | (289,000 | ) |  | 22,170,000 |
State and political subdivisions | 221,245,000 |  |  | 1,497,000 |  |  | (4,001,000 | ) |  | 218,741,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 258,690,000 |  |  | $ | 1,966,000 |  |  | $ | (4,805,000 | ) |  | $ | 255,851,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 10,910,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,910,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 11,947,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,947,000 |
Contractual Maturities of Investment Securities | The following table summarizes the contractual maturities of investment securities at March 31, 2019:
| 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 | $ | — |  |  | $ | — |  |  | $ | 1,429,000 |  |  | $ | 1,431,000 |
Due in 1 to 5 years | 15,670,000 |  |  | 15,736,000 |  |  | 21,096,000 |  |  | 21,203,000 |
Due in 5 to 10 years | 107,978,000 |  |  | 108,698,000 |  |  | 176,967,000 |  |  | 178,044,000 |
Due after 10 years | 203,576,000 |  |  | 200,842,000 |  |  | 81,727,000 |  |  | 81,890,000 |
| $ | 327,224,000 |  |  | $ | 325,276,000 |  |  | $ | 281,219,000 |  |  | $ | 282,568,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 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 | $ | — |  |  | $ | — |  |  | $ | 1,432,000 |  |  | $ | 1,433,000 |
Due in 1 to 5 years | 13,501,000 |  |  | 13,518,000 |  |  | 20,717,000 |  |  | 20,778,000 |
Due in 5 to 10 years | 83,954,000 |  |  | 83,326,000 |  |  | 157,544,000 |  |  | 155,313,000 |
Due after 10 years | 226,354,000 |  |  | 220,572,000 |  |  | 75,970,000 |  |  | 73,376,000 |
| $ | 323,809,000 |  |  | $ | 317,416,000 |  |  | $ | 255,663,000 |  |  | $ | 250,900,000 |
The following table summarizes the contractual maturities of investment securities at March 31, 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 | $ | 61,000 |  |  | $ | 61,000 |  |  | $ | 634,000 |  |  | $ | 635,000 |
Due in 1 to 5 years | 6,502,000 |  |  | 6,492,000 |  |  | 25,692,000 |  |  | 25,796,000 |
Due in 5 to 10 years | 66,434,000 |  |  | 65,234,000 |  |  | 145,297,000 |  |  | 144,211,000 |
Due after 10 years | 235,703,000 |  |  | 229,052,000 |  |  | 87,067,000 |  |  | 85,209,000 |
| $ | 308,700,000 |  |  | $ | 300,839,000 |  |  | $ | 258,690,000 |  |  | $ | 255,851,000 |
Schedule of Securities Gains and Losses | The following table shows securities gains and losses for the three months ended March 31, 2019 and 2018:
| For the three months ended March 31, |
| 2019 |  | 2018 |
Proceeds from sales of securities | $ | — |  |  | $ | 459,000 |  |
Gross realized gains | — |  |  | 136,000 |  |
Gross realized losses | — |  |  | — |  |
Net gain | $ | — |  |  | $ | 136,000 |  |
Related income taxes | $ | — |  |  | $ | 29,000 |  |
Schedule of Securities Temporarily Impaired | Information regarding securities temporarily impaired as of March 31, 2019 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 | $ | — |  |  | $ | — |  |  | $ | 10,875,000 |  |  | $ | (280,000 | ) |  | $ | 10,875,000 |  |  | $ | (280,000 | )
Mortgage-backed securities | 24,525,000 |  |  | (138,000 | ) |  | 198,272,000 |  |  | (3,248,000 | ) |  | 222,797,000 |  |  | (3,386,000 | )
State and political subdivisions | 1,264,000 |  |  | (3,000 | ) |  | 58,168,000 |  |  | (1,920,000 | ) |  | 59,432,000 |  |  | (1,923,000 | )
Corporate securities | 2,994,000 |  |  | (6,000 | ) |  | — |  |  | — |  |  | 2,994,000 |  |  | (6,000 | )
| $ | 28,783,000 |  |  | $ | (147,000 | ) |  | $ | 267,315,000 |  |  | $ | (5,448,000 | ) |  | $ | 296,098,000 |  |  | $ | (5,595,000 | )
As of December 31, 2018, there were 511 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 232 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 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 | $ | — |  |  | $ | — |  |  | $ | 10,683,000 |  |  | $ | (472,000 | ) |  | $ | 10,683,000 |  |  | $ | (472,000 | )
Mortgage-backed securities | 76,050,000 |  |  | (1,061,000 | ) |  | 185,136,000 |  |  | (5,926,000 | ) |  | 261,186,000 |  |  | (6,987,000 | )
State and political subdivisions | 76,809,000 |  |  | (1,784,000 | ) |  | 45,052,000 |  |  | (3,873,000 | ) |  | 121,861,000 |  |  | (5,657,000 | )
| $ | 152,859,000 |  |  | $ | (2,845,000 | ) |  | $ | 240,871,000 |  |  | $ | (10,271,000 | ) |  | $ | 393,730,000 |  |  | $ | (13,116,000 | )
As of March 31, 2018, there were 457 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 159 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of March 31, 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 | $ | 6,946,000 |  |  | $ | (309,000 | ) |  | $ | 3,694,000 |  |  | $ | (206,000 | ) |  | $ | 10,640,000 |  |  | $ | (515,000 | )
Mortgage-backed securities | 183,335,000 |  |  | (4,332,000 | ) |  | 101,012,000 |  |  | (3,755,000 | ) |  | 284,347,000 |  |  | (8,087,000 | )
State and political subdivisions | 64,594,000 |  |  | (1,533,000 | ) |  | 37,182,000 |  |  | (2,725,000 | ) |  | 101,776,000 |  |  | (4,258,000 | )
| $ | 254,875,000 |  |  | $ | (6,174,000 | ) |  | $ | 141,888,000 |  |  | $ | (6,686,000 | ) |  | $ | 396,763,000 |  |  | $ | (12,860,000 | )

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