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Investments (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments [Abstract] |
Aggregate Values And Unrealized Gains And Losses Of Investment Securities | The amortized cost and fair value of investment securities at March 31, 2019 and December 31, 2018, were as follows:
| March 31, 2019
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,196,584 |  |  | $ | 1,305 |  |  | $ | 847 |  |  | $ | 1,197,042 |
Government agency | 351,284 |  |  | 330 |  |  | 1,087 |  |  | 350,527 |
Mortgage-backed securities | 2,917,000 |  |  | 7,373 |  |  | 28,429 |  |  | 2,895,944 |
Corporate bonds | 142,939 |  |  | 183 |  |  | 960 |  |  | 142,162 |
Other | 3,929 |  |  | 196 |  |  | — |  |  | 4,125 |
Total investment securities available for sale | 4,611,736 |  |  | 9,387 |  |  | 31,323 |  |  | 4,589,800 |
Investment in marketable equity securities | 79,809 |  |  | 30,252 |  |  | 177 |  |  | 109,884 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | 2,214,829 |  |  | 40,545 |  |  | 450 |  |  | 2,254,924 |
Total investment securities | $ | 6,906,374 |  |  | $ | 80,184 |  |  | $ | 31,950 |  |  | $ | 6,954,608 |
| December 31, 2018
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,249,243 |  |  | $ | 633 |  |  | $ | 2,166 |  |  | $ | 1,247,710 |
Government agency | 257,252 |  |  | 222 |  |  | 639 |  |  | 256,835 |
Mortgage-backed securities | 2,956,793 |  |  | 5,309 |  |  | 52,763 |  |  | 2,909,339 |
Corporate bonds | 139,906 |  |  | 59 |  |  | 864 |  |  | 139,101 |
Other | 3,923 |  |  | 202 |  |  | — |  |  | 4,125 |
Total investment securities available for sale | 4,607,117 |  |  | 6,425 |  |  | 56,432 |  |  | 4,557,110 |
Investment in marketable equity securities | 73,809 |  |  | 19,010 |  |  | 220 |  |  | 92,599 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | 2,184,653 |  |  | 17,339 |  |  | 490 |  |  | 2,201,502 |
Total investment securities | $ | 6,865,579 |  |  | $ | 42,774 |  |  | $ | 57,142 |  |  | $ | 6,851,211 |
Investment Securities Maturity Information | The following table provides the amortized cost and fair value by contractual maturity for investment securities available for sale and held to maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Repayments of mortgage-backed securities are dependent on the repayments of the underlying loan balances, while repayments of certain corporate bonds are subject to call provisions that can be exercised by the issuer at their discretion.
| March 31, 2019 |  | December 31, 2018
(Dollars in thousands) | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 1,046,796 |  |  | $ | 1,046,362 |  |  | $ | 1,049,253 |  |  | $ | 1,047,380 |
One through five years | 155,297 |  |  | 155,680 |  |  | 205,526 |  |  | 205,805 |
Five through 10 years | 137,430 |  |  | 137,162 |  |  | 134,370 |  |  | 133,626 |
Over 10 years | 3,929 |  |  | 4,125 |  |  | 3,923 |  |  | 4,125 |
Government agency | 351,284 |  |  | 350,527 |  |  | 257,252 |  |  | 256,835 |
Mortgage-backed securities | 2,917,000 |  |  | 2,895,944 |  |  | 2,956,793 |  |  | 2,909,339 |
Total investment securities available for sale | $ | 4,611,736 |  |  | $ | 4,589,800 |  |  | $ | 4,607,117 |  |  | $ | 4,557,110 |
Investment securities held to maturity |  |  |  |  |  |  |
Total investment securities held to maturity | $ | 2,214,829 |  |  | $ | 2,254,924 |  |  | $ | 2,184,653 |  |  | $ | 2,201,502 |
Marketable Securities Gains (Losses) | The following table provides the realized and unrealized gains on marketable equity securities for the three months ended March 31, 2019.
| Three months ended March 31
(Dollars in thousands) | 2019 |  | 2018
Marketable equity securities gains, net | $ | 11,328 |  |  | $ | 971 |
Less net gains recognized on marketable equity securities sold | 44 |  |  | 96 |
Unrealized gains recognized on marketable equity securities held | $ | 11,284 |  |  | $ | 875 |
Investment Securities With Unrealized Losses | The following table provides information regarding securities with unrealized losses as of March 31, 2019 and December 31, 2018.
| March 31, 2019
| Less than 12 months |  | 12 months or more |  | Total
(Dollars in thousands) | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 599,883 |  |  | $ | 847 |  |  | $ | 599,883 |  |  | $ | 847 |
Government agency | 219,395 |  |  | 901 |  |  | 12,590 |  |  | 186 |  |  | 231,985 |  |  | 1,087 |
Mortgage-backed securities | 114,863 |  |  | 314 |  |  | 1,956,003 |  |  | 28,115 |  |  | 2,070,866 |  |  | 28,429 |
Corporate bonds | 56,393 |  |  | 891 |  |  | 9,950 |  |  | 69 |  |  | 66,343 |  |  | 960 |
Total | $ | 390,651 |  |  | $ | 2,106 |  |  | $ | 2,578,426 |  |  | $ | 29,217 |  |  | $ | 2,969,077 |  |  | $ | 31,323 |
Investment securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 40,142 |  |  | $ | 291 |  |  | $ | 9,988 |  |  | $ | 159 |  |  | $ | 50,130 |  |  | $ | 450 |
| December 31, 2018
| Less than 12 months |  | 12 months or more |  | Total
(Dollars in thousands) | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 248,983 |  |  | $ | 113 |  |  | $ | 848,622 |  |  | $ | 2,053 |  |  | $ | 1,097,605 |  |  | $ | 2,166 |
Government agency | 115,273 |  |  | 601 |  |  | 2,310 |  |  | 38 |  |  | 117,583 |  |  | 639 |
Mortgage-backed securities | 262,204 |  |  | 2,387 |  |  | 1,940,695 |  |  | 50,376 |  |  | 2,202,899 |  |  | 52,763 |
Corporate bonds | 79,066 |  |  | 842 |  |  | 5,000 |  |  | 22 |  |  | 84,066 |  |  | 864 |
Total | $ | 705,526 |  |  | $ | 3,943 |  |  | $ | 2,796,627 |  |  | $ | 52,489 |  |  | $ | 3,502,153 |  |  | $ | 56,432 |
Investment securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 5,111 |  |  | $ | 181 |  |  | $ | 10,131 |  |  | $ | 309 |  |  | $ | 15,242 |  |  | $ | 490 |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | INVESTMENTS The amortized cost and fair value of investment securities at March 31, 2019 and December 31, 2018, were as follows:
| March 31, 2019
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,196,584 |  |  | $ | 1,305 |  |  | $ | 847 |  |  | $ | 1,197,042 |
Government agency | 351,284 |  |  | 330 |  |  | 1,087 |  |  | 350,527 |
Mortgage-backed securities | 2,917,000 |  |  | 7,373 |  |  | 28,429 |  |  | 2,895,944 |
Corporate bonds | 142,939 |  |  | 183 |  |  | 960 |  |  | 142,162 |
Other | 3,929 |  |  | 196 |  |  | — |  |  | 4,125 |
Total investment securities available for sale | 4,611,736 |  |  | 9,387 |  |  | 31,323 |  |  | 4,589,800 |
Investment in marketable equity securities | 79,809 |  |  | 30,252 |  |  | 177 |  |  | 109,884 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | 2,214,829 |  |  | 40,545 |  |  | 450 |  |  | 2,254,924 |
Total investment securities | $ | 6,906,374 |  |  | $ | 80,184 |  |  | $ | 31,950 |  |  | $ | 6,954,608 |
| December 31, 2018
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,249,243 |  |  | $ | 633 |  |  | $ | 2,166 |  |  | $ | 1,247,710 |
Government agency | 257,252 |  |  | 222 |  |  | 639 |  |  | 256,835 |
Mortgage-backed securities | 2,956,793 |  |  | 5,309 |  |  | 52,763 |  |  | 2,909,339 |
Corporate bonds | 139,906 |  |  | 59 |  |  | 864 |  |  | 139,101 |
Other | 3,923 |  |  | 202 |  |  | — |  |  | 4,125 |
Total investment securities available for sale | 4,607,117 |  |  | 6,425 |  |  | 56,432 |  |  | 4,557,110 |
Investment in marketable equity securities | 73,809 |  |  | 19,010 |  |  | 220 |  |  | 92,599 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | 2,184,653 |  |  | 17,339 |  |  | 490 |  |  | 2,201,502 |
Total investment securities | $ | 6,865,579 |  |  | $ | 42,774 |  |  | $ | 57,142 |  |  | $ | 6,851,211 |
Investments in mortgage-backed securities represent securities issued by the Government National Mortgage Association, Federal National Mortgage Association and Federal Home Loan Mortgage Corporation. Investments in government agency securities represent securities issued by the United States Small Business Administration. Investments in corporate bonds and marketable equity securities represent positions in securities of other financial institutions. Other investments include trust preferred securities of financial institutions. BancShares holds approximately 298,000 shares of Visa Class B common stock. BancShares' Visa Class B shares are not considered to have a readily determinable fair value and are included in the Consolidated Balance Sheet with no fair value. The following table provides the amortized cost and fair value by contractual maturity for investment securities available for sale and held to maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Repayments of mortgage-backed securities are dependent on the repayments of the underlying loan balances, while repayments of certain corporate bonds are subject to call provisions that can be exercised by the issuer at their discretion.
| March 31, 2019 |  | December 31, 2018
(Dollars in thousands) | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 1,046,796 |  |  | $ | 1,046,362 |  |  | $ | 1,049,253 |  |  | $ | 1,047,380 |
One through five years | 155,297 |  |  | 155,680 |  |  | 205,526 |  |  | 205,805 |
Five through 10 years | 137,430 |  |  | 137,162 |  |  | 134,370 |  |  | 133,626 |
Over 10 years | 3,929 |  |  | 4,125 |  |  | 3,923 |  |  | 4,125 |
Government agency | 351,284 |  |  | 350,527 |  |  | 257,252 |  |  | 256,835 |
Mortgage-backed securities | 2,917,000 |  |  | 2,895,944 |  |  | 2,956,793 |  |  | 2,909,339 |
Total investment securities available for sale | $ | 4,611,736 |  |  | $ | 4,589,800 |  |  | $ | 4,607,117 |  |  | $ | 4,557,110 |
Investment securities held to maturity |  |  |  |  |  |  |
Total investment securities held to maturity | $ | 2,214,829 |  |  | $ | 2,254,924 |  |  | $ | 2,184,653 |  |  | $ | 2,201,502 |
There were no gross gains or losses on sales of investment securities available for sale for the three months ended March 31, 2019 and March 31, 2018. The following table provides the realized and unrealized gains on marketable equity securities for the three months ended March 31, 2019.
| Three months ended March 31
(Dollars in thousands) | 2019 |  | 2018
Marketable equity securities gains, net | $ | 11,328 |  |  | $ | 971 |
Less net gains recognized on marketable equity securities sold | 44 |  |  | 96 |
Unrealized gains recognized on marketable equity securities held | $ | 11,284 |  |  | $ | 875 |
The following table provides information regarding securities with unrealized losses as of March 31, 2019 and December 31, 2018.
| March 31, 2019
| Less than 12 months |  | 12 months or more |  | Total
(Dollars in thousands) | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | — |  |  | $ | — |  |  | $ | 599,883 |  |  | $ | 847 |  |  | $ | 599,883 |  |  | $ | 847 |
Government agency | 219,395 |  |  | 901 |  |  | 12,590 |  |  | 186 |  |  | 231,985 |  |  | 1,087 |
Mortgage-backed securities | 114,863 |  |  | 314 |  |  | 1,956,003 |  |  | 28,115 |  |  | 2,070,866 |  |  | 28,429 |
Corporate bonds | 56,393 |  |  | 891 |  |  | 9,950 |  |  | 69 |  |  | 66,343 |  |  | 960 |
Total | $ | 390,651 |  |  | $ | 2,106 |  |  | $ | 2,578,426 |  |  | $ | 29,217 |  |  | $ | 2,969,077 |  |  | $ | 31,323 |
Investment securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 40,142 |  |  | $ | 291 |  |  | $ | 9,988 |  |  | $ | 159 |  |  | $ | 50,130 |  |  | $ | 450 |
| December 31, 2018
| Less than 12 months |  | 12 months or more |  | Total
(Dollars in thousands) | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Investment securities available for sale |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 248,983 |  |  | $ | 113 |  |  | $ | 848,622 |  |  | $ | 2,053 |  |  | $ | 1,097,605 |  |  | $ | 2,166 |
Government agency | 115,273 |  |  | 601 |  |  | 2,310 |  |  | 38 |  |  | 117,583 |  |  | 639 |
Mortgage-backed securities | 262,204 |  |  | 2,387 |  |  | 1,940,695 |  |  | 50,376 |  |  | 2,202,899 |  |  | 52,763 |
Corporate bonds | 79,066 |  |  | 842 |  |  | 5,000 |  |  | 22 |  |  | 84,066 |  |  | 864 |
Total | $ | 705,526 |  |  | $ | 3,943 |  |  | $ | 2,796,627 |  |  | $ | 52,489 |  |  | $ | 3,502,153 |  |  | $ | 56,432 |
Investment securities held to maturity |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 5,111 |  |  | $ | 181 |  |  | $ | 10,131 |  |  | $ | 309 |  |  | $ | 15,242 |  |  | $ | 490 |
As of March 31, 2019, there were 230 investment securities available for sale that had continuous losses for more than 12 months of which 223 were government sponsored enterprise-issued mortgage-backed securities or government agency securities, five were U.S. Treasury securities and two were corporate bonds. There were two investment securities held to maturity, which were government sponsored enterprise-issued mortgage-backed securities, which had continuous losses for more than 12 months at March 31, 2019. None of the unrealized losses identified as of March 31, 2019 or December 31, 2018 relate to the marketability of the securities or the issuers' ability to honor redemption obligations. Rather, the unrealized losses relate to changes in interest rates relative to when the debt securities were purchased. BancShares has the ability and intent to retain these securities for a period of time sufficient to recover all unrealized losses. Therefore, none of the securities were deemed to be other than temporarily impaired. Debt securities having an aggregate carrying value of $3.68 billion at March 31, 2019 and $4.03 billion at December 31, 2018 were pledged as collateral to secure public funds on deposit and certain short-term borrowings, and for other purposes as required by law.

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