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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Available For Sale And Held For Maturity Securities [Table Text Block] | The amortized cost, gross unrealized gains and losses and estimated fair values for available-for-sale and held-to-maturity securities by major security type at December 31, 2016 and December 31, 2015 were as follows (in thousands):
December 31, 2016 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Available-for-sale: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 138,819 |  |  | $ | 13 |  |  | $ | (2,508 | ) |  | $ | 136,324 |
Obligations of states and political subdivisions | 164,163 |  |  | 1,346 |  |  | (2,804 | ) |  | 162,705 |
Mortgage-backed securities: GSE residential | 318,829 |  |  | 531 |  |  | (4,369 | ) |  | 314,991 |
Trust preferred securities | 3,050 |  |  | — |  |  | (1,398 | ) |  | 1,652 |
Other securities | 4,034 |  |  | 147 |  |  | (5 | ) |  | 4,176 |
Total available-for-sale | $ | 628,895 |  |  | $ | 2,037 |  |  | $ | (11,084 | ) |  | $ | 619,848 |
Held-to-maturity: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 74,231 |  |  | $ | 203 |  |  | $ | (1,338 | ) |  | $ | 73,096 |
December 31, 2015 |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 90,368 |  |  | $ | 41 |  |  | $ | (268 | ) |  | $ | 90,141 |
Obligations of states and political subdivisions | 107,164 |  |  | 3,608 |  |  | (55 | ) |  | 110,717 |
Mortgage-backed securities: GSE residential | 312,132 |  |  | 1,374 |  |  | (1,452 | ) |  | 312,054 |
Trust preferred securities | 3,130 |  |  | — |  |  | (1,224 | ) |  | 1,906 |
Other securities | 4,035 |  |  | 29 |  |  | (34 | ) |  | 4,030 |
Total available-for-sale | $ | 516,829 |  |  | $ | 5,052 |  |  | $ | (3,033 | ) |  | $ | 518,848 |
Held-to-maturity: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations & agencies | $ | 85,208 |  |  | $ | 743 |  |  | $ | (214 | ) |  | $ | 85,737 |
During the third quarter of 2014, management evaluated its available-for-sale portfolio and transferred obligations of U.S. government corporations & agencies securities with a fair value of $53.6 million from available-for-sale to held-to-maturity to reduce price volatility. Management determined it had both the intent and ability to hold these securities to maturity. Transfers of investment securities into the held-to-maturity category from available-for-sale are made at fair value on the date of transfer. There were no gains or losses recognized as a result of this transfer. The related $1.4 million of unrealized holding loss that was included in the transfer is retained in the carrying value of the held-to-maturity securities and in other comprehensive income net of deferred taxes. These amounts are being amortized into net interest income over the remaining life of the related securities as a yield adjustment, resulting in no impact on future net income. Trust preferred securities at December 31, 2016, is one trust preferred pooled security issued by First Tennessee Financial (“FTN”). The unrealized loss of this security, which has a maturity of twenty-one years, is primarily due to its long-term nature, a lack of demand or inactive market for the security, and concerns regarding the underlying financial institutions that have issued the trust preferred security. See the heading “Trust Preferred Securities” below for further information regarding this security.
Realized Gains and Losses From Sale of Securities | Proceeds from sales of investment securities, realized gains and losses and income tax expense and benefit were as follows during the years ended December 31, 2016, 2015 and 2014 (in thousands):
| 2016 |  | 2015 |  | 2014
Proceeds from sales | $ | 70,757 |  |  | $ | 19,380 |  |  | $ | 75,618 |
Gross gains | 1,192 |  |  | 452 |  |  | 1,452 |
Gross losses | — |  |  | — |  |  | 737 |
Income tax expense | 465 |  |  | 176 |  |  | 279 |
Investments Classified by Contractual Maturity Date | The following table indicates the expected maturities of investment securities classified as available-for-sale presented at fair value, and held-to-maturity presented at amortized cost at December 31, 2016 and the weighted average yield for each range of maturities (in thousands):
| One year or less |  | After 1 through 5 years |  | After 5 through 10 years |  | After ten years |  | Total
Available-for-sale: |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 67,138 |  |  | $ | 42,647 |  |  | $ | 26,539 |  |  | $ | — |  |  | $ | 136,324 |
Obligations of state and political subdivisions | 14,860 |  |  | 83,676 |  |  | 63,382 |  |  | 787 |  |  | 162,705 |
Mortgage-backed securities: GSE residential | 572 |  |  | 125,297 |  |  | 189,122 |  |  | — |  |  | 314,991 |
Trust preferred securities | — |  |  | — |  |  | — |  |  | 1,652 |  |  | 1,652 |
Other securities | — |  |  | 1,995 |  |  | 2,037 |  |  | 144 |  |  | 4,176 |
Total investments | $ | 82,570 |  |  | $ | 253,615 |  |  | $ | 281,080 |  |  | $ | 2,583 |  |  | $ | 619,848 |
Weighted average yield | 2.12 | % |  | 2.36 | % |  | 2.63 | % |  | 2.20 | % |  | 2.45 | %
Full tax-equivalent yield | 2.49 | % |  | 2.93 | % |  | 3.07 | % |  | 2.71 | % |  | 2.93 | %
Held-to-maturity: |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 44,992 |  |  | $ | 29,239 |  |  | $ | — |  |  | $ | — |  |  | $ | 74,231 |
Weighted average yield | 1.79 | % |  | 2.08 | % |  | — | % |  | — | % |  | 1.90 | %
Full tax-equivalent yield | 1.79 | % |  | 2.08 | % |  | — | % |  | — | % |  | 1.90 | %
The weighted average yields are calculated on the basis of the amortized cost and effective yields weighted for the scheduled maturity of each security. Tax-equivalent yields have been calculated using a 35% tax rate. With the exception of obligations of the U.S. Treasury and other U.S. government agencies and corporations, there were no investment securities of any single issuer, the book value of which exceeded 10% of stockholders' equity at December 31, 2016.
Fair value of investments with sustained gross unrealized losses | The following table presents the aging of gross unrealized losses and fair value by investment category as of December 31, 2016 and 2015 (in thousands):
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 125,257 |  |  | $ | (2,508 | ) |  | $ | — |  |  | $ | — |  |  | $ | 125,257 |  |  | $ | (2,508 | )
Obligations of states and political subdivisions | 93,405 |  |  | (2,804 | ) |  | — |  |  | — |  |  | 93,405 |  |  | (2,804 | )
Mortgage-backed securities: GSE residential | 266,319 |  |  | (4,099 | ) |  | 5,878 |  |  | (270 | ) |  | 272,197 |  |  | (4,369 | )
Trust preferred securities | — |  |  | — |  |  | 1,652 |  |  | (1,398 | ) |  | 1,652 |  |  | (1,398 | )
Other securities | — |  |  | — |  |  | 1,995 |  |  | (5 | ) |  | 1,995 |  |  | (5 | )
Total | $ | 484,981 |  |  | $ | (9,411 | ) |  | $ | 9,525 |  |  | $ | (1,673 | ) |  | $ | 494,506 |  |  | $ | (11,084 | )
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 53,295 |  |  | $ | (1,338 | ) |  | $ | — |  |  | $ | — |  |  | $ | 53,295 |  |  | $ | (1,338 | )
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 34,942 |  |  | $ | (142 | ) |  | $ | 12,971 |  |  | $ | (126 | ) |  | $ | 47,913 |  |  | $ | (268 | )
Obligations of states and political subdivisions | 3,168 |  |  | (32 | ) |  | 979 |  |  | (23 | ) |  | 4,147 |  |  | (55 | )
Mortgage-backed securities: GSE residential | 164,249 |  |  | (841 | ) |  | 20,011 |  |  | (611 | ) |  | 184,260 |  |  | (1,452 | )
Trust preferred securities | — |  |  | — |  |  | 1,906 |  |  | (1,224 | ) |  | 1,906 |  |  | (1,224 | )
Other securities | 1,966 |  |  | (34 | ) |  | — |  |  | — |  |  | 1,966 |  |  | (34 | )
Total | $ | 204,325 |  |  | $ | (1,049 | ) |  | $ | 35,867 |  |  | $ | (1,984 | ) |  | $ | 240,192 |  |  | $ | (3,033 | )
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 35,845 |  |  | $ | (214 | ) |  | $ | — |  |  | $ | — |  |  | $ | 35,845 |  |  | $ | (214 | )
Trust Preferred Securities [Table Text Block] | Following are the details for the impaired trust preferred security remaining as of December 31, 2016 (in thousands):
| Book Value |  | Market Value |  | Unrealized Gains (Losses) |  | Other-than- temporary Impairment Recorded To-date
PreTSL XXVIII | $ | 3,050 |  |  | $ | 1,652 |  |  | $ | (1,398 | ) |  | $ | (1,111 | )
Credit Losses Recognized on Investments | As described above, some of the Company’s investments in trust preferred securities have experienced fair value deterioration due to credit losses but are not otherwise other-than-temporarily impaired. The following table provides information about those trust preferred securities for which only a credit loss was recognized in income and other losses are recorded in other comprehensive income (loss) for the years ended December 31, 2016, 2015 and 2014 (in thousands).
| Accumulated Credit Losses as of December 31:
| 2016 |  | 2015 |  | 2014
Credit losses on trust preferred securities held: |  |  |  |  |
Beginning of period | $ | 1,111 |  |  | $ | 1,111 |  |  | $ | 1,111 |
Additions related to OTTI losses not previously recognized | — |  |  | — |  |  | — |
Reductions due to sales / (recoveries) | — |  |  | — |  |  | — |
Reductions due to change in intent or likelihood of sale | — |  |  | — |  |  | — |
Additions related to increases in previously recognized OTTI losses | — |  |  | — |  |  | — |
Reductions due to increases in expected cash flows | — |  |  | — |  |  | — |
End of period | $ | 1,111 |  |  | $ | 1,111 |  |  | $ | 1,111 |
Maturities of Investment Securities |
|  | Amortized Cost |  | Estimated Fair Value
Available-for-sale: |  |  |  |
Due in one year or less |  | $ | 83,588 |  |  | $ | 81,998 |
Due after one-five years |  | 128,818 |  |  | 128,318 |
Due after five-ten years |  | 93,754 |  |  | 91,958 |
Due after ten years |  | 3,906 |  |  | 2,583 |
|  | 310,066 |  |  | 304,857 |
Mortgage-backed securities: GSE residential |  | 318,829 |  |  | 314,991 |
Total available-for-sale |  | 628,895 |  |  | 619,848 |
Held-to-maturity: |  |  |  |
Due in one year or less |  | 44,992 |  |  | 43,798 |
Due after one-five years |  | 29,239 |  |  | 29,298 |
Due after five-ten years |  | — |  |  | — |
Due after ten years |  | — |  |  | — |
Total held-to-maturity |  | 74,231 |  |  | $ | 73,096 |
Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

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- Definition Tabular disclosure of available-for-sale and held-for-maturity 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, 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. + References No definition available. + Details
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- Definition Tabular disclosure of trust preferred securities which includes book value (that is, amortized cost basis), market value (that is, fair value), unrealized gains (losses) and other-than-temporary impairment recorded to-date. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27340-111563 + Details
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