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Securities Available-for-Sale (Tables) | 9 Months Ended
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Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract] |
Composition of Securities Available-for-Sale | The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented:
| September 30, 2016 |  | December 31, 2015
(dollars in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
U.S. treasury securities | $ | 14,944 |  | $ | 112 |  | $ | — |  | $ | 15,056 |  |  | $ | 14,914 |  | $ | 27 |  | $ | — |  | $ | 14,941 |
Obligations of U.S. government corporations and agencies | 246,259 |  | 4,665 |  | — |  | 250,924 |  |  | 262,045 |  | 1,825 |  | (567 | ) | 263,303 |
Collateralized mortgage obligations of U.S. government corporations and agencies | 134,675 |  | 2,785 |  | — |  | 137,460 |  |  | 128,458 |  | 693 |  | (316 | ) | 128,835 |
Residential mortgage-backed securities of U.S. government corporations and agencies | 34,685 |  | 1,600 |  | — |  | 36,285 |  |  | 39,185 |  | 1,091 |  | (151 | ) | 40,125 |
Commercial mortgage-backed securities of U.S. government corporations and agencies | 86,827 |  | 1,680 |  | (8 | ) | 88,499 |  |  | 69,697 |  | 183 |  | (676 | ) | 69,204 |
Obligations of states and political subdivisions | 124,229 |  | 8,307 |  | — |  | 132,536 |  |  | 128,904 |  | 5,988 |  | (6 | ) | 134,886 |
Debt Securities | 641,619 |  | 19,149 |  | (8 | ) | 660,760 |  |  | 643,203 |  | 9,807 |  | (1,716 | ) | 651,294 |
Marketable equity securities | 7,579 |  | 2,789 |  | — |  | 10,368 |  |  | 7,579 |  | 2,090 |  | — |  | 9,669 |
Total | $ | 649,198 |  | $ | 21,938 |  | $ | (8 | ) | $ | 671,128 |  |  | $ | 650,782 |  | $ | 11,897 |  | $ | (1,716 | ) | $ | 660,963 |
Fair Value and Age of Gross Unrealized Losses by Investment Category | The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented:
| September 30, 2016
| Less Than 12 Months |  | 12 Months or More |  | Total
(dollars in thousands) | Number of Securities | Fair Value |  | Unrealized Losses |  |  | Number of Securities | Fair Value |  | Unrealized Losses |  |  | Number of Securities | Fair Value |  | Unrealized Losses |
U.S. Treasury securities | — | $ | — |  | $ | — |  |  | — | $ | — |  | $ | — |  |  | — | $ | — |  | $ | — |
Obligations of U.S. government corporations and agencies | — | — |  | — |  |  | — | — |  | — |  |  | — | — |  | — |
Collateralized mortgage obligations of U.S. government corporations and agencies | — | — |  | — |  |  | — | — |  | — |  |  | — | — |  | — |
Residential mortgage-backed securities of U.S. government corporations and agencies | — | — |  | — |  |  | — | — |  | — |  |  | — | — |  | — |
Commercial mortgage-backed securities of U.S. government corporations and agencies | 1 | 7,841 |  | (8 | ) |  | — | — |  | — |  |  | 1 | 7,841 |  | (8 | )
Obligations of states and political subdivisions | — | — |  | — |  |  | — | — |  | — |  |  | — | — |  | — |
Debt Securities | 1 | 7,841 |  | (8 | ) |  | — | — |  | — |  |  | 1 | 7,841 |  | (8 | )
Marketable equity securities | 1 | 71 |  | — |  |  | — | — |  | — |  |  | 1 | 71 |  | — |
Total Temporarily Impaired Securities | 2 | $ | 7,912 |  | $ | (8 | ) |  | — | $ | — |  | $ | — |  |  | 2 | $ | 7,912 |  | $ | (8 | )
| December 31, 2015
| Less Than 12 Months |  | 12 Months or More |  | Total
(dollars in thousands) | Number of Securities | Fair Value |  | Unrealized Losses |  |  | Number of Securities | Fair Value |  | Unrealized Losses |  |  | Number of Securities | Fair Value |  | Unrealized Losses |
U.S. Treasury securities | — | $ | — |  | $ | — |  |  | — | $ | — |  | $ | — |  |  | — | $ | — |  | $ | — |
Obligations of U.S. government corporations and agencies | 10 | 88,584 |  | (379 | ) |  | 2 | 14,542 |  | (188 | ) |  | 12 | 103,126 |  | (567 | )
Collateralized mortgage obligations of U.S. government corporations and agencies | 6 | 61,211 |  | (316 | ) |  | — | — |  | — |  |  | 6 | 61,211 |  | (316 | )
Residential mortgage-backed securities of U.S. government corporations and agencies | 1 | 7,993 |  | (151 | ) |  | — | — |  | — |  |  | 1 | 7,993 |  | (151 | )
Commercial mortgage-backed securities of U.S. government corporations and agencies | 5 | 50,839 |  | (450 | ) |  | 1 | 9,472 |  | (226 | ) |  | 6 | 60,311 |  | (676 | )
Obligations of states and political subdivisions | 1 | 5,370 |  | (6 | ) |  | — | — |  | — |  |  | 1 | 5,370 |  | (6 | )
Debt Securities | 23 | 213,997 |  | (1,302 | ) |  | 3 | 24,014 |  | (414 | ) |  | 26 | 238,011 |  | (1,716 | )
Marketable equity securities | — | — |  | — |  |  | — | — |  | — |  |  | — | — |  | — |
Total Temporarily Impaired Securities | 23 | $ | 213,997 |  | $ | (1,302 | ) |  | 3 | $ | 24,014 |  | $ | (414 | ) |  | 26 | $ | 238,011 |  | $ | (1,716 | )
Unrealized Gains and Losses, Net of Tax on Securities Available for Sale | The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive (loss)/income, for the periods presented:
| September 30, 2016 |  | December 31, 2015
(dollars in thousands) | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Net Unrealized Gains/ (Losses) |  |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Net Unrealized Gains/ (Losses) |
Total unrealized gains/(losses) on securities available-for-sale | $ | 21,938 |  | $ | (8 | ) | $ | 21,930 |  |  | $ | 11,897 |  | $ | (1,716 | ) | $ | 10,181 |
Income tax expense/(benefit) | 7,678 |  | (3 | ) | 7,675 |  |  | 4,164 |  | (601 | ) | 3,563 |
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) | $ | 14,260 |  | $ | (5 | ) | $ | 14,255 |  |  | $ | 7,733 |  | $ | (1,115 | ) | $ | 6,618 |
Amortized Cost and Fair Value of Available-for-Sale Securities | The amortized cost and fair value of securities available-for-sale at September 30, 2016 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
| September 30, 2016
(dollars in thousands) | Amortized Cost |  |  | Fair Value |
Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions |  |  |
Due in one year or less | $ | 52,302 |  |  | $ | 52,439 |
Due after one year through five years | 216,729 |  |  | 222,114 |
Due after five years through ten years | 55,893 |  |  | 58,699 |
Due after ten years | 60,508 |  |  | 65,264 |
| 385,432 |  |  | 398,516 |
Collateralized mortgage obligations of U.S. government corporations and agencies | 134,675 |  |  | 137,460 |
Residential mortgage-backed securities of U.S. government corporations and agencies | 34,685 |  |  | 36,285 |
Commercial mortgage-backed securities of U.S. government corporations and agencies | 86,827 |  |  | 88,499 |
Debt Securities | 641,619 |  |  | 660,760 |
Marketable equity securities | 7,579 |  |  | 10,368 |
Total | $ | 649,198 |  |  | $ | 671,128 |

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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=6957658&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=73527792&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=73527792&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=6957658&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=73527792&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=73527792&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=73527792&loc=d3e27290-111563 + Details
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