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Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation | The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity:
| September 30, 2018
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 99,914 |  |  | $ | — |  |  | $ | (2,233 | ) |  | $ | 97,681 |
Obligations of states and political subdivisions | 30,563 |  |  | 238 |  |  | (268 | ) |  | 30,533 |
Agency mortgage-backed securities | 551,552 |  |  | 180 |  |  | (19,385 | ) |  | 532,347 |
U.S. Treasury bills | 9,960 |  |  | — |  |  | (193 | ) |  | 9,767 |
Total securities available for sale | $ | 691,989 |  |  | $ | 418 |  |  | $ | (22,079 | ) |  | $ | 670,328 |
Held to maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 12,521 |  |  | $ | 6 |  |  | $ | (324 | ) |  | $ | 12,203 |
Agency mortgage-backed securities | 54,610 |  |  | — |  |  | (2,397 | ) |  | 52,213 |
Total securities held to maturity | $ | 67,131 |  |  | $ | 6 |  |  | $ | (2,721 | ) |  | $ | 64,416 |
| December 31, 2017
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 99,878 |  |  | $ | 6 |  |  | $ | (660 | ) |  | $ | 99,224 |
Obligations of states and political subdivisions | 34,181 |  |  | 674 |  |  | (213 | ) |  | 34,642 |
Agency mortgage-backed securities | 513,082 |  |  | 727 |  |  | (6,293 | ) |  | 507,516 |
Total securities available for sale | $ | 647,141 |  |  | $ | 1,407 |  |  | $ | (7,166 | ) |  | $ | 641,382 |
Held to maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 14,031 |  |  | $ | 69 |  |  | $ | (46 | ) |  | $ | 14,054 |
Agency mortgage-backed securities | 59,718 |  |  | 16 |  |  | (330 | ) |  | 59,404 |
Total securities held to maturity | $ | 73,749 |  |  | $ | 85 |  |  | $ | (376 | ) |  | $ | 73,458 |
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation | The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity:
| September 30, 2018
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 99,914 |  |  | $ | — |  |  | $ | (2,233 | ) |  | $ | 97,681 |
Obligations of states and political subdivisions | 30,563 |  |  | 238 |  |  | (268 | ) |  | 30,533 |
Agency mortgage-backed securities | 551,552 |  |  | 180 |  |  | (19,385 | ) |  | 532,347 |
U.S. Treasury bills | 9,960 |  |  | — |  |  | (193 | ) |  | 9,767 |
Total securities available for sale | $ | 691,989 |  |  | $ | 418 |  |  | $ | (22,079 | ) |  | $ | 670,328 |
Held to maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 12,521 |  |  | $ | 6 |  |  | $ | (324 | ) |  | $ | 12,203 |
Agency mortgage-backed securities | 54,610 |  |  | — |  |  | (2,397 | ) |  | 52,213 |
Total securities held to maturity | $ | 67,131 |  |  | $ | 6 |  |  | $ | (2,721 | ) |  | $ | 64,416 |
| December 31, 2017
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 99,878 |  |  | $ | 6 |  |  | $ | (660 | ) |  | $ | 99,224 |
Obligations of states and political subdivisions | 34,181 |  |  | 674 |  |  | (213 | ) |  | 34,642 |
Agency mortgage-backed securities | 513,082 |  |  | 727 |  |  | (6,293 | ) |  | 507,516 |
Total securities available for sale | $ | 647,141 |  |  | $ | 1,407 |  |  | $ | (7,166 | ) |  | $ | 641,382 |
Held to maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 14,031 |  |  | $ | 69 |  |  | $ | (46 | ) |  | $ | 14,054 |
Agency mortgage-backed securities | 59,718 |  |  | 16 |  |  | (330 | ) |  | 59,404 |
Total securities held to maturity | $ | 73,749 |  |  | $ | 85 |  |  | $ | (376 | ) |  | $ | 73,458 |
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of debt securities at September 30, 2018, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 5 years.
| Available for sale |  | Held to maturity
(in thousands) | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 12,193 |  |  | $ | 12,107 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 110,517 |  |  | 108,231 |  |  | 868 |  |  | 856 |
Due after five years through ten years | 12,688 |  |  | 12,678 |  |  | 11,294 |  |  | 10,995 |
Due after ten years | 5,039 |  |  | 4,965 |  |  | 359 |  |  | 352 |
Agency mortgage-backed securities | 551,552 |  |  | 532,347 |  |  | 54,610 |  |  | 52,213 |
| $ | 691,989 |  |  | $ | 670,328 |  |  | $ | 67,131 |  |  | $ | 64,416 |
Schedule of Unrealized Loss on Investments | The following table represents a summary of investment securities that had an unrealized loss:
| September 30, 2018
Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 58,592 |  |  | $ | 1,353 |  |  | $ | 39,089 |  |  | $ | 880 |  |  | $ | 97,681 |  |  | $ | 2,233 |
Obligations of states and political subdivisions | 24,152 |  |  | 468 |  |  | 3,296 |  |  | 124 |  |  | 27,448 |  |  | 592 |
Agency mortgage-backed securities | 297,577 |  |  | 8,216 |  |  | 270,949 |  |  | 13,566 |  |  | 568,526 |  |  | 21,782 |
U.S. Treasury bills | 9,767 |  |  | 193 |  |  | — |  |  | — |  |  | 9,767 |  |  | 193 |
| $ | 390,088 |  |  | $ | 10,230 |  |  | $ | 313,334 |  |  | $ | 14,570 |  |  | $ | 703,422 |  |  | $ | 24,800 |
| December 31, 2017
Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 89,309 |  |  | $ | 660 |  |  | $ | — |  |  | $ | — |  |  | $ | 89,309 |  |  | $ | 660 |
Obligations of states and political subdivisions | 13,951 |  |  | 259 |  |  | — |  |  | — |  |  | 13,951 |  |  | 259 |
Agency mortgage-backed securities | 469,655 |  |  | 6,034 |  |  | 12,229 |  |  | 589 |  |  | 481,884 |  |  | 6,623 |
| $ | 572,915 |  |  | $ | 6,953 |  |  | $ | 12,229 |  |  | $ | 589 |  |  | $ | 585,144 |  |  | $ | 7,542 |

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