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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
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:
| 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 |
| December 31, 2016
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 107,312 |  |  | $ | 348 |  |  | $ | — |  |  | $ | 107,660 |
Obligations of states and political subdivisions | 36,486 |  |  | 630 |  |  | (485 | ) |  | 36,631 |
Agency mortgage-backed securities | 319,345 |  |  | 1,101 |  |  | (3,940 | ) |  | 316,506 |
Total securities available for sale | $ | 463,143 |  |  | $ | 2,079 |  |  | $ | (4,425 | ) |  | $ | 460,797 |
Held to maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 14,759 |  |  | $ | 11 |  |  | $ | (242 | ) |  | $ | 14,528 |
Agency mortgage-backed securities | 65,704 |  |  | 45 |  |  | (638 | ) |  | 65,111 |
Total securities held to maturity | $ | 80,463 |  |  | $ | 56 |  |  | $ | (880 | ) |  | $ | 79,639 |
At December 31, 2017, and 2016, there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than the U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government-sponsored enterprises. Securities having a fair value of $500.0 million and $407.3 million at December 31, 2017, and December 31, 2016, respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions.
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:
| 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 |
| December 31, 2016
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available for sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 107,312 |  |  | $ | 348 |  |  | $ | — |  |  | $ | 107,660 |
Obligations of states and political subdivisions | 36,486 |  |  | 630 |  |  | (485 | ) |  | 36,631 |
Agency mortgage-backed securities | 319,345 |  |  | 1,101 |  |  | (3,940 | ) |  | 316,506 |
Total securities available for sale | $ | 463,143 |  |  | $ | 2,079 |  |  | $ | (4,425 | ) |  | $ | 460,797 |
Held to maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 14,759 |  |  | $ | 11 |  |  | $ | (242 | ) |  | $ | 14,528 |
Agency mortgage-backed securities | 65,704 |  |  | 45 |  |  | (638 | ) |  | 65,111 |
Total securities held to maturity | $ | 80,463 |  |  | $ | 56 |  |  | $ | (880 | ) |  | $ | 79,639 |
At December 31, 2017, and 2016, there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than the U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government-sponsored enterprises. Securities having a fair value of $500.0 million and $407.3 million at December 31, 2017, and December 31, 2016, respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions.
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of debt securities at December 31, 2017, 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 agency mortgage-backed securities is approximately 4 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 | $ | 3,060 |  |  | $ | 3,076 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 110,910 |  |  | 110,480 |  |  | 186 |  |  | 195 |
Due after five years through ten years | 14,573 |  |  | 14,980 |  |  | 12,977 |  |  | 12,981 |
Due after ten years | 5,516 |  |  | 5,330 |  |  | 868 |  |  | 878 |
Agency mortgage-backed securities | 513,082 |  |  | 507,516 |  |  | 59,718 |  |  | 59,404 |
| $ | 647,141 |  |  | $ | 641,382 |  |  | $ | 73,749 |  |  | $ | 73,458 |
Schedule of Unrealized Loss on Investments | The following table represents a summary of investment securities that had an unrealized loss:
| 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 |
| December 31, 2016
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 states and political subdivisions | $ | 21,361 |  |  | $ | 408 |  |  | $ | 3,553 |  |  | $ | 320 |  |  | $ | 24,914 |  |  | $ | 728 |
Agency mortgage-backed securities | 267,734 |  |  | 4,084 |  |  | 12,883 |  |  | 493 |  |  | 280,617 |  |  | 4,577 |
| $ | 289,095 |  |  | $ | 4,492 |  |  | $ | 16,436 |  |  | $ | 813 |  |  | $ | 305,531 |  |  | $ | 5,305 |
Schedule of Realized Gain (Loss) | The gross gains and losses realized from sales of available for sale investment securities were as follows:
| December 31,
(in thousands) | 2017 |  | 2016 |  | 2015
Gross gains realized | $ | 22 |  |  | $ | 86 |  |  | $ | 63 |
Gross losses realized | — |  |  | — |  |  | (40 | )
Proceeds from sales | 144,076 |  |  | 2,493 |  |  | 41,069 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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