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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities and Held-to-maturity Securities Reconciliation | Our investment securities portfolio consists of obligations of state and political subdivisions, corporate bonds, U.S. government agency securities, including mortgage-backed securities (“MBS”) and collateralized mortgage obligations (“CMOs”) issued or guaranteed by Federal National Mortgage Association ("FNMA"), Federal Home Loan Mortgage Corporation ("FHLMC"), or Government National Mortgage Association ("GNMA"), debentures issued by government-sponsored agencies such as FNMA, Federal Farm Credit Bureau, FHLB and FHLMC, as well as privately issued CMOs, as reflected in the table below:
| December 31, 2016 | December 31, 2015
| Amortized |  | Fair |  | Gross Unrealized | Amortized |  | Fair |  | Gross Unrealized
(in thousands) | Cost |  | Value |  | Gains |  | (Losses) |  | Cost |  | Value |  | Gains |  | (Losses) |
Held-to-maturity: |  |  |  |  |  |  |  |
Obligations of state and political subdivisions | $ | 30,856 |  | $ | 31,544 |  | $ | 694 |  | $ | (6 | ) | $ | 42,919 |  | $ | 44,146 |  | $ | 1,246 |  | $ | (19 | )
Corporate bonds | 3,519 |  | 3,518 |  | — |  | (1 | ) | 15,072 |  | 15,098 |  | 42 |  | (16 | )
MBS pass-through securities issued by FHLMC and FNMA | 10,063 |  | 10,035 |  | 126 |  | (154 | ) | 11,646 |  | 11,810 |  | 171 |  | (7 | )
Total held-to-maturity | 44,438 |  | 45,097 |  | 820 |  | (161 | ) | 69,637 |  | 71,054 |  | 1,459 |  | (42 | )
Available-for-sale: |  |  |  |  |  |  |  |
Securities of U.S. government agencies: |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 193,998 |  | 190,566 |  | 145 |  | (3,577 | ) | 138,222 |  | 138,462 |  | 694 |  | (454 | )
CMOs issued by FNMA | 13,790 |  | 13,772 |  | 91 |  | (109 | ) | 18,266 |  | 18,219 |  | 97 |  | (144 | )
CMOs issued by FHLMC | 43,452 |  | 42,758 |  | 37 |  | (731 | ) | 22,889 |  | 22,932 |  | 82 |  | (39 | )
CMOs issued by GNMA | 6,844 |  | 6,945 |  | 102 |  | (1 | ) | 10,326 |  | 10,480 |  | 169 |  | (15 | )
Debentures of government- sponsored agencies | 35,486 |  | 35,403 |  | 7 |  | (90 | ) | 161,690 |  | 160,892 |  | 28 |  | (826 | )
Privately issued CMOs | 419 |  | 419 |  | 1 |  | (1 | ) | 3,960 |  | 4,150 |  | 190 |  | — |
Obligations of state and political subdivisions | 79,306 |  | 77,701 |  | 135 |  | (1,740 | ) | 57,110 |  | 57,673 |  | 580 |  | (17 | )
Corporate bonds | 4,959 |  | 5,016 |  | 57 |  | — |  | 4,947 |  | 4,979 |  | 43 |  | (11 | )
Total available-for-sale | 378,254 |  | 372,580 |  | 575 |  | (6,249 | ) | 417,410 |  | 417,787 |  | 1,883 |  | (1,506 | )
Total investment securities | $ | 422,692 |  | $ | 417,677 |  | $ | 1,395 |  | $ | (6,410 | ) | $ | 487,047 |  | $ | 488,841 |  | $ | 3,342 |  | $ | (1,548 | )
Investments Classified by Contractual Maturity Date | The amortized cost and fair value of investment debt securities by contractual maturity at December 31, 2016 are shown below. Expected maturities may differ from contractual maturities if the issuers of the securities have the right to call or prepay obligations with or without call or prepayment penalties.
| December 31, 2016 | December 31, 2015
| Held-to-Maturity | Available-for-Sale | Held-to-Maturity | Available-for-Sale
(in thousands) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
Within one year | $ | 13,473 |  | $ | 13,506 |  | $ | 20,136 |  | $ | 20,109 |  | $ | 18,853 |  | $ | 18,920 |  | $ | 12,135 |  | $ | 12,176 |
After one but within five years | 16,706 |  | 17,150 |  | 58,334 |  | 58,267 |  | 31,677 |  | 32,360 |  | 188,007 |  | 187,326 |
After five years through ten years | 3,000 |  | 3,125 |  | 113,576 |  | 110,842 |  | 8,580 |  | 8,969 |  | 64,899 |  | 64,999 |
After ten years | 11,259 |  | 11,316 |  | 186,208 |  | 183,362 |  | 10,527 |  | 10,805 |  | 152,369 |  | 153,286 |
Total | $ | 44,438 |  | $ | 45,097 |  | $ | 378,254 |  | $ | 372,580 |  | $ | 69,637 |  | $ | 71,054 |  | $ | 417,410 |  | $ | 417,787 |
Schedule of Unrealized Loss on Investments | Those securities are summarized and classified according to the duration of the loss period in the tables below:
December 31, 2016 | < 12 continuous months |  |  | ≥ 12 continuous months |  |  | Total securities in a loss position |
(in thousands) | Fair value |  | Unrealized loss |  |  | Fair value |  | Unrealized loss |  |  | Fair value |  | Unrealized loss |
Held-to-maturity: |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | $ | 2,250 |  | $ | (154 | ) |  |  |  |  |  |  | $ | 2,250 |  | $ | (154 | )
Obligations of state and political subdivisions | 3,362 |  | (6 | ) |  |  |  |  |  |  | 3,362 |  | (6 | )
Corporate bonds | 3,518 |  | (1 | ) |  |  |  |  |  |  | 3,518 |  | (1 | )
Total held-to-maturity | 9,130 |  | (161 | ) |  | — |  | — |  |  | 9,130 |  | (161 | )
Available-for-sale: |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 162,016 |  | (3,577 | ) |  |  |  |  |  |  | 162,016 |  | (3,577 | )
CMOs issued by FNMA | 9,498 |  | (109 | ) |  |  |  |  |  |  | 9,498 |  | (109 | )
CMOs issued by FHLMC | 31,545 |  | (731 | ) |  |  |  |  |  |  | 31,545 |  | (731 | )
CMOs issued by GNMA | 1,583 |  | (1 | ) |  |  |  |  |  |  | 1,583 |  | (1 | )
Debentures of government- sponsored agencies | 19,951 |  | (38 | ) |  | 9,946 |  | (52 | ) |  | 29,897 |  | (90 | )
Obligations of state and political subdivisions | 59,567 |  | (1,740 | ) |  |  |  |  |  |  | 59,567 |  | (1,740 | )
Privately issued CMO's | 154 |  | (1 | ) |  |  |  |  |  |  | 154 |  | (1 | )
Total available-for-sale | 284,314 |  | (6,197 | ) |  | 9,946 |  | (52 | ) |  | 294,260 |  | (6,249 | )
Total temporarily impaired securities | $ | 293,444 |  | $ | (6,358 | ) |  | $ | 9,946 |  | $ | (52 | ) |  | $ | 303,390 |  | $ | (6,410 | )
December 31, 2015 | < 12 continuous months |  |  | > 12 continuous months |  |  | Total securities in a loss position |
(in thousands) | Fair value |  | Unrealized loss |  |  | Fair value |  | Unrealized loss |  |  | Fair value |  | Unrealized loss |
Held-to-maturity: |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | $ | 2,332 |  | $ | (7 | ) |  | $ | — |  | $ | — |  |  | $ | 2,332 |  | $ | (7 | )
Obligations of state and political subdivisions | 8,297 |  | (19 | ) |  | — |  | — |  |  | 8,297 |  | (19 | )
Corporate bonds | 3,523 |  | (15 | ) |  | 1,999 |  | (1 | ) |  | 5,522 |  | (16 | )
Total held-to-maturity | 14,152 |  | (41 | ) |  | 1,999 |  | (1 | ) |  | 16,151 |  | (42 | )
Available-for-sale: |  |  |  |  |  |  |  |
MBS pass-through securities issued by FHLMC and FNMA | 68,809 |  | (454 | ) |  | — |  | — |  |  | 68,809 |  | (454 | )
CMOs issued by FNMA | 9,277 |  | (80 | ) |  | 3,158 |  | (64 | ) |  | 12,435 |  | (144 | )
CMOs issued by FHLMC | — |  | — |  |  | 1,989 |  | (39 | ) |  | 1,989 |  | (39 | )
CMOs issued by GNMA | 164 |  | — |  |  | 2,374 |  | (15 | ) |  | 2,538 |  | (15 | )
Debentures of government- sponsored agencies | 136,064 |  | (713 | ) |  | 9,887 |  | (113 | ) |  | 145,951 |  | (826 | )
Obligations of state and political subdivisions | 4,557 |  | (15 | ) |  | 579 |  | (2 | ) |  | 5,136 |  | (17 | )
Corporate bonds | 2,986 |  | (11 | ) |  | — |  | — |  |  | 2,986 |  | (11 | )
Total available-for-sale | 221,857 |  | (1,273 | ) |  | 17,987 |  | (233 | ) |  | 239,844 |  | (1,506 | )
Total temporarily impaired securities | $ | 236,009 |  | $ | (1,314 | ) |  | $ | 19,986 |  | $ | (234 | ) |  | $ | 255,995 |  | $ | (1,548 | )
Gain (Loss) on Investments [Table Text Block] | Sales of investment securities and gross gains and losses are shown in the following table. The sales of the held-to-maturity securities were due to evidence of significant deterioration of the issuers' creditworthiness since purchase.
(in thousands) | 2016 | 2015 | 2014
Available-for-sale: |  |  |
Sales proceeds | $ | 68,673 |  | $ | 2,099 |  | $ | 2,436 |
Gross realized gains | $ | 458 |  | $ | 7 |  | $ | 4 |
Gross realized losses | $ | (64 | ) | $ | (1 | ) | $ | (28 | )
Held-to-maturity: |  |  |
Sales proceeds | $ | 1,265 |  | $ | 1,015 |  | $ | 2,146 |
Gross realized gains | $ | 32 |  | $ | 73 |  | $ | 104 |
Gross realized losses | $ | — |  | $ | — |  | $ | — |

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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.M) -URI http://asc.fasb.org/extlink&oid=65877573&loc=d3e87990-122713 + Details
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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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