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Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Securities [Abstract] |
Amortized Cost and Fair Value of Securities | The amortized cost and fair value of securities at September 30, 2016 are summarized as follows: Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 243,980 |  |  | $ | 1,311 |  |  | $ | (180 | ) |  | $ | 245,111 |
State and political subdivisions |  |  | 128,644 |  |  |  | 4,646 |  |  |  | (115 | ) |  |  | 133,175 |
U.S. government sponsored agency mortgage-backed securities |  |  | 226,794 |  |  |  | 1,820 |  |  |  | (843 | ) |  |  | 227,771 |
Total debt securities |  |  | 599,418 |  |  |  | 7,777 |  |  |  | (1,138 | ) |  |  | 606,057 |
CRA investment funds |  |  | 25,000 |  |  |  | 293 |  |  |  | (149 | ) |  |  | 25,144 |
Total available-for-sale securities |  | $ | 624,418 |  |  | $ | 8,070 |  |  | $ | (1,287 | ) |  | $ | 631,201 |
Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
State and political subdivisions |  | $ | 1,181 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 1,182 |
Total held-to-maturity securities |  | $ | 1,181 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 1,182 |
The amortized cost and fair value of securities at December 31, 2015 are summarized as follows: Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 240,434 |  |  | $ | 311 |  |  | $ | (1,351 | ) |  | $ | 239,394 |
State and political subdivisions |  |  | 125,665 |  |  |  | 3,707 |  |  |  | (157 | ) |  |  | 129,215 |
U.S. government sponsored agency mortgage-backed securities |  |  | 202,282 |  |  |  | 1,564 |  |  |  | (2,270 | ) |  |  | 201,576 |
Total debt securities |  |  | 568,381 |  |  |  | 5,582 |  |  |  | (3,778 | ) |  |  | 570,185 |
CRA investment funds |  |  | 25,000 |  |  |  | 132 |  |  |  | (381 | ) |  |  | 24,751 |
Total available-for-sale securities |  | $ | 593,381 |  |  | $ | 5,714 |  |  | $ | (4,159 | ) |  | $ | 594,936 |
Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 480 |  |  | $ | 0 |  |  | $ | (12 | ) |  | $ | 468 |
State and political subdivisions |  |  | 1,181 |  |  |  | 2 |  |  |  | 0 |  |  |  | 1,183 |
Total held-to-maturity securities |  | $ | 1,661 |  |  | $ | 2 |  |  | $ | (12 | ) |  | $ | 1,651 |
Amortized Cost and Fair Value of Securities by Contractual Maturity | The amortized cost and fair value of securities at September 30, 2016 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Available-for-Sale |  |  | Held-to-Maturity |
(in thousands) |  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 68,479 |  |  | $ | 68,576 |  |  | $ | 0 |  |  | $ | 0 |
Due after one through five years |  |  | 154,511 |  |  |  | 156,366 |  |  |  | 1,181 |  |  |  | 1,182 |
Due after five through ten years |  |  | 63,044 |  |  |  | 65,336 |  |  |  | 0 |  |  |  | 0 |
Due after ten years |  |  | 86,590 |  |  |  | 88,008 |  |  |  | 0 |  |  |  | 0 |
U.S. government sponsored agency mortgage-backed securities |  |  | 226,794 |  |  |  | 227,771 |  |  |  | 0 |  |  |  | 0 |
Total debt securities |  |  | 599,418 |  |  |  | 606,057 |  |  |  | 1,181 |  |  |  | 1,182 |
CRA investment funds |  |  | 25,000 |  |  |  | 25,144 |  |  |  | 0 |  |  |  | 0 |
Total securities |  | $ | 624,418 |  |  | $ | 631,201 |  |  | $ | 1,181 |  |  | $ | 1,182 |
Available for Sale Securities and Held-to-Maturity Securities, Continuous Unrealized Loss Position | The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of September 30, 2016 that are not deemed to be other-than-temporarily impaired. Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 58,160 |  |  | $ | (155 | ) |  | $ | 58,005 |
State and political subdivisions |  |  | 10,697 |  |  |  | (105 | ) |  |  | 10,592 |
U.S. government sponsored agency mortgage-backed securities |  |  | 109,623 |  |  |  | (308 | ) |  |  | 109,315 |
Total debt securities |  |  | 178,480 |  |  |  | (568 | ) |  |  | 177,912 |
CRA investment funds |  |  | 10,000 |  |  |  | (27 | ) |  |  | 9,973 |
Total <12 months temporarily impaired AFS securities |  |  | 188,480 |  |  |  | (595 | ) |  |  | 187,885 |
12 Months or More |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 1,927 |  |  |  | (25 | ) |  |  | 1,902 |
State and political subdivisions |  |  | 753 |  |  |  | (10 | ) |  |  | 743 |
U.S. government sponsored agency mortgage-backed securities |  |  | 32,712 |  |  |  | (535 | ) |  |  | 32,177 |
Total debt securities |  |  | 35,392 |  |  |  | (570 | ) |  |  | 34,822 |
CRA investment funds |  |  | 5,000 |  |  |  | (122 | ) |  |  | 4,878 |
Total ≥12 months temporarily impaired AFS securities |  |  | 40,392 |  |  |  | (692 | ) |  |  | 39,700 |
Total |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 60,087 |  |  |  | (180 | ) |  |  | 59,907 |
State and political subdivisions |  |  | 11,450 |  |  |  | (115 | ) |  |  | 11,335 |
U.S. government sponsored agency mortgage-backed securities |  |  | 142,335 |  |  |  | (843 | ) |  |  | 141,492 |
Total debt securities |  |  | 213,872 |  |  |  | (1,138 | ) |  |  | 212,734 |
CRA investment funds |  |  | 15,000 |  |  |  | (149 | ) |  |  | 14,851 |
Total temporarily impaired AFS securities |  | $ | 228,872 |  |  | $ | (1,287 | ) |  | $ | 227,585 |
The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2015 that are not deemed to be other-than-temporarily impaired. The analysis performed as of December 31, 2015 indicated that all impairment was considered temporary, market and interest rate driven, and not credit-related. Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 142,147 |  |  | $ | (487 | ) |  | $ | 141,660 |
State and political subdivisions |  |  | 11,190 |  |  |  | (106 | ) |  |  | 11,084 |
U.S. government sponsored agency mortgage-backed securities |  |  | 92,009 |  |  |  | (899 | ) |  |  | 91,110 |
Total debt securities |  |  | 245,346 |  |  |  | (1,492 | ) |  |  | 243,854 |
CRA investment funds |  |  | 10,000 |  |  |  | (183 | ) |  |  | 9,817 |
Total <12 months temporarily impaired AFS securities |  |  | 255,346 |  |  |  | (1,675 | ) |  |  | 253,671 |
12 Months or More |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 54,773 |  |  |  | (864 | ) |  |  | 53,909 |
State and political subdivisions |  |  | 3,187 |  |  |  | (51 | ) |  |  | 3,136 |
U.S. government sponsored agency mortgage-backed securities |  |  | 49,908 |  |  |  | (1,371 | ) |  |  | 48,537 |
Total debt securities |  |  | 107,868 |  |  |  | (2,286 | ) |  |  | 105,582 |
CRA investment funds |  |  | 5,000 |  |  |  | (198 | ) |  |  | 4,802 |
Total ≥12 months temporarily impaired AFS securities |  |  | 112,868 |  |  |  | (2,484 | ) |  |  | 110,384 |
Total |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 196,920 |  |  |  | (1,351 | ) |  |  | 195,569 |
State and political subdivisions |  |  | 14,377 |  |  |  | (157 | ) |  |  | 14,220 |
U.S. government sponsored agency mortgage-backed securities |  |  | 141,917 |  |  |  | (2,270 | ) |  |  | 139,647 |
Total debt securities |  |  | 353,214 |  |  |  | (3,778 | ) |  |  | 349,436 |
CRA investment funds |  |  | 15,000 |  |  |  | (381 | ) |  |  | 14,619 |
Total temporarily impaired AFS securities |  | $ | 368,214 |  |  | $ | (4,159 | ) |  | $ | 364,055 |
Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
12 Months or More |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 480 |  |  | $ | (12 | ) |  | $ | 468 |
Total temporarily impaired HTM securities |  | $ | 480 |  |  | $ | (12 | ) |  | $ | 468 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: 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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