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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Gain (Loss) on Investments [Line Items] |
Aggregate Values And Unrealized Gains And Losses Of Investment Securities | The amortized cost and fair value of investment securities classified as available for sale and held to maturity at March 31, 2018 and December 31, 2017, are as follows:
| March 31, 2018
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,557,991 |  |  | $ | — |  |  | $ | 4,098 |  |  | $ | 1,553,893 |
Government agency | 32,006 |  |  | 12 |  |  | 109 |  |  | 31,909 |
Mortgage-backed securities | 5,360,251 |  |  | 1,001 |  |  | 154,585 |  |  | 5,206,667 |
Corporate bonds | 59,414 |  |  | 319 |  |  | 80 |  |  | 59,653 |
Other | 5,538 |  |  | 80 |  |  | — |  |  | 5,618 |
Total investment securities available for sale | $ | 7,015,200 |  |  | $ | 1,412 |  |  | $ | 158,872 |  |  | $ | 6,857,740 |
| December 31, 2017
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,658,410 |  |  | $ | — |  |  | $ | 546 |  |  | $ | 1,657,864 |
Government agency | 8,695 |  |  | 15 |  |  | 40 |  |  | 8,670 |
Mortgage-backed securities | 5,419,379 |  |  | 1,529 |  |  | 80,152 |  |  | 5,340,756 |
Equity securities | 75,471 |  |  | 29,737 |  |  | — |  |  | 105,208 |
Corporate bonds | 59,414 |  |  | 557 |  |  | 8 |  |  | 59,963 |
Other | 7,645 |  |  | 256 |  |  | 182 |  |  | 7,719 |
Total investment securities available for sale | $ | 7,229,014 |  |  | $ | 32,094 |  |  | $ | 80,928 |  |  | $ | 7,180,180 |
| March 31, 2018
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | $ | 74 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 79 |
| December 31, 2017
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | $ | 76 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 81 |
Investment Securities Maturity Information | The following table provides the amortized cost and fair value by contractual 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.
| March 31, 2018 |  | December 31, 2017
(Dollars in thousands) | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 1,105,460 |  |  | $ | 1,103,291 |  |  | $ | 808,768 |  |  | $ | 808,301 |
One through five years | 453,082 |  |  | 451,152 |  |  | 850,532 |  |  | 850,450 |
Five through 10 years | 60,303 |  |  | 60,546 |  |  | 60,332 |  |  | 60,886 |
Over 10 years | 36,104 |  |  | 36,084 |  |  | 14,532 |  |  | 14,579 |
Mortgage-backed securities | 5,360,251 |  |  | 5,206,667 |  |  | 5,419,379 |  |  | 5,340,756 |
Equity securities | — |  |  | — |  |  | 75,471 |  |  | 105,208 |
Total investment securities available for sale | $ | 7,015,200 |  |  | $ | 6,857,740 |  |  | $ | 7,229,014 |  |  | $ | 7,180,180 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities held to maturity | $ | 74 |  |  | $ | 79 |  |  | $ | 76 |  |  | $ | 81 |
Securities Gains (Losses) |
Marketable Securities Gains (Losses) | The following table provides the realized and unrealized gains or losses on marketable equity securities for the three months ended March 31, 2018.
(Dollars in thousands) |  | Three months ended March 31, 2018
Marketable equity securities gains, net |  | $ | 971 |
Less net gains recognized on marketable equity securities sold |  | 96 |
Unrealized gains recognized on marketable equity securities held |  | $ | 875 |
Investment Securities With Unrealized Losses | The following table provides information regarding securities available for sale with unrealized losses as of March 31, 2018 and December 31, 2017.
| March 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 | $ | 1,453,968 |  |  | $ | 4,049 |  |  | $ | 99,925 |  |  | $ | 49 |  |  | $ | 1,553,893 |  |  | $ | 4,098 |
Government agency | 12,059 |  |  | 81 |  |  | 2,159 |  |  | 28 |  |  | 14,218 |  |  | 109 |
Mortgage-backed securities | 2,404,338 |  |  | 58,606 |  |  | 2,535,662 |  |  | 95,979 |  |  | 4,940,000 |  |  | 154,585 |
Corporate bonds | 9,950 |  |  | 80 |  |  | — |  |  | — |  |  | 9,950 |  |  | 80 |
Total | $ | 3,880,315 |  |  | $ | 62,816 |  |  | $ | 2,637,746 |  |  | $ | 96,056 |  |  | $ | 6,518,061 |  |  | $ | 158,872 |
| December 31, 2017
| Less than 12 months |  | 12 months or more |  | Total
| Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,408,166 |  |  | $ | 345 |  |  | $ | 249,698 |  |  | $ | 201 |  |  | $ | 1,657,864 |  |  | $ | 546 |
Government agency | 848 |  |  | 12 |  |  | 2,527 |  |  | 28 |  |  | 3,375 |  |  | 40 |
Mortgage-backed securities | 2,333,254 |  |  | 20,911 |  |  | 2,723,406 |  |  | 59,241 |  |  | 5,056,660 |  |  | 80,152 |
Corporate bonds | 5,025 |  |  | 8 |  |  | — |  |  | — |  |  | 5,025 |  |  | 8 |
Other | 5,349 |  |  | 182 |  |  | — |  |  | — |  |  | 5,349 |  |  | 182 |
Total | $ | 3,752,642 |  |  | $ | 21,458 |  |  | $ | 2,975,631 |  |  | $ | 59,470 |  |  | $ | 6,728,273 |  |  | $ | 80,928 |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | INVESTMENTS The amortized cost and fair value of investment securities classified as available for sale and held to maturity at March 31, 2018 and December 31, 2017, are as follows:
| March 31, 2018
(Dollars in thousands) | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,557,991 |  |  | $ | — |  |  | $ | 4,098 |  |  | $ | 1,553,893 |
Government agency | 32,006 |  |  | 12 |  |  | 109 |  |  | 31,909 |
Mortgage-backed securities | 5,360,251 |  |  | 1,001 |  |  | 154,585 |  |  | 5,206,667 |
Corporate bonds | 59,414 |  |  | 319 |  |  | 80 |  |  | 59,653 |
Other | 5,538 |  |  | 80 |  |  | — |  |  | 5,618 |
Total investment securities available for sale | $ | 7,015,200 |  |  | $ | 1,412 |  |  | $ | 158,872 |  |  | $ | 6,857,740 |
| December 31, 2017
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
U.S. Treasury | $ | 1,658,410 |  |  | $ | — |  |  | $ | 546 |  |  | $ | 1,657,864 |
Government agency | 8,695 |  |  | 15 |  |  | 40 |  |  | 8,670 |
Mortgage-backed securities | 5,419,379 |  |  | 1,529 |  |  | 80,152 |  |  | 5,340,756 |
Equity securities | 75,471 |  |  | 29,737 |  |  | — |  |  | 105,208 |
Corporate bonds | 59,414 |  |  | 557 |  |  | 8 |  |  | 59,963 |
Other | 7,645 |  |  | 256 |  |  | 182 |  |  | 7,719 |
Total investment securities available for sale | $ | 7,229,014 |  |  | $ | 32,094 |  |  | $ | 80,928 |  |  | $ | 7,180,180 |
| March 31, 2018
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | $ | 74 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 79 |
| December 31, 2017
| Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities | $ | 76 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 81 |
As a result of adopting ASU 2016-01 in the first quarter of 2018, investments in marketable equity securities are no longer classified as investments available for sale. At March 31, 2018 and December 31, 2017, we had $110.1 million and $105.2 million, respectively, in marketable equity securities recorded at fair value. Prior to January 1, 2018 equity securities were classified as available for sale and stated at fair value with unrealized gains and losses reported in accumulated other comprehensive income. A cumulative-effect adjustment of $18.7 million was recorded on January 1, 2018 to reclassify the net unrealized gains from accumulated other comprehensive income to retained earnings with subsequent changes in fair value recognized in the Consolidated Statements of Income. Investments in mortgage-backed securities primarily represent securities issued by the Government National Mortgage Association, Federal National Mortgage Association and Federal Home Loan Mortgage Corporation. 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. The following table provides the amortized cost and fair value by contractual 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.
| March 31, 2018 |  | December 31, 2017
(Dollars in thousands) | Cost |  | Fair value |  | Cost |  | Fair value
Investment securities available for sale |  |  |  |  |  |  |
Non-amortizing securities maturing in: |  |  |  |  |  |  |
One year or less | $ | 1,105,460 |  |  | $ | 1,103,291 |  |  | $ | 808,768 |  |  | $ | 808,301 |
One through five years | 453,082 |  |  | 451,152 |  |  | 850,532 |  |  | 850,450 |
Five through 10 years | 60,303 |  |  | 60,546 |  |  | 60,332 |  |  | 60,886 |
Over 10 years | 36,104 |  |  | 36,084 |  |  | 14,532 |  |  | 14,579 |
Mortgage-backed securities | 5,360,251 |  |  | 5,206,667 |  |  | 5,419,379 |  |  | 5,340,756 |
Equity securities | — |  |  | — |  |  | 75,471 |  |  | 105,208 |
Total investment securities available for sale | $ | 7,015,200 |  |  | $ | 6,857,740 |  |  | $ | 7,229,014 |  |  | $ | 7,180,180 |
Investment securities held to maturity |  |  |  |  |  |  |
Mortgage-backed securities held to maturity | $ | 74 |  |  | $ | 79 |  |  | $ | 76 |  |  | $ | 81 |
There were no sales of investment securities available for sale for the three months ended March 31, 2018. Gross gains and gross losses on sales of investment securities available for sale were $3 thousand and $27 thousand, respectively for the three months ended March 31, 2017.
The following table provides the realized and unrealized gains or losses on marketable equity securities for the three months ended March 31, 2018.
(Dollars in thousands) |  | Three months ended March 31, 2018
Marketable equity securities gains, net |  | $ | 971 |
Less net gains recognized on marketable equity securities sold |  | 96 |
Unrealized gains recognized on marketable equity securities held |  | $ | 875 |
The following table provides information regarding securities available for sale with unrealized losses as of March 31, 2018 and December 31, 2017.
| March 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 | $ | 1,453,968 |  |  | $ | 4,049 |  |  | $ | 99,925 |  |  | $ | 49 |  |  | $ | 1,553,893 |  |  | $ | 4,098 |
Government agency | 12,059 |  |  | 81 |  |  | 2,159 |  |  | 28 |  |  | 14,218 |  |  | 109 |
Mortgage-backed securities | 2,404,338 |  |  | 58,606 |  |  | 2,535,662 |  |  | 95,979 |  |  | 4,940,000 |  |  | 154,585 |
Corporate bonds | 9,950 |  |  | 80 |  |  | — |  |  | — |  |  | 9,950 |  |  | 80 |
Total | $ | 3,880,315 |  |  | $ | 62,816 |  |  | $ | 2,637,746 |  |  | $ | 96,056 |  |  | $ | 6,518,061 |  |  | $ | 158,872 |
| December 31, 2017
| Less than 12 months |  | 12 months or more |  | Total
| Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 1,408,166 |  |  | $ | 345 |  |  | $ | 249,698 |  |  | $ | 201 |  |  | $ | 1,657,864 |  |  | $ | 546 |
Government agency | 848 |  |  | 12 |  |  | 2,527 |  |  | 28 |  |  | 3,375 |  |  | 40 |
Mortgage-backed securities | 2,333,254 |  |  | 20,911 |  |  | 2,723,406 |  |  | 59,241 |  |  | 5,056,660 |  |  | 80,152 |
Corporate bonds | 5,025 |  |  | 8 |  |  | — |  |  | — |  |  | 5,025 |  |  | 8 |
Other | 5,349 |  |  | 182 |  |  | — |  |  | — |  |  | 5,349 |  |  | 182 |
Total | $ | 3,752,642 |  |  | $ | 21,458 |  |  | $ | 2,975,631 |  |  | $ | 59,470 |  |  | $ | 6,728,273 |  |  | $ | 80,928 |
Investment securities available for sale with an aggregate fair value of $2.64 billion and $2.98 billion had continuous unrealized losses for more than 12 months with a corresponding aggregate unrealized loss of $96.1 million and $59.5 million as of March 31, 2018 and December 31, 2017, respectively. As of March 31, 2018, 224 of these are government sponsored enterprise-issued mortgage-backed securities or government agency securities and 1 is a U.S. Treasury security. None of the unrealized losses identified as of March 31, 2018 or December 31, 2017 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. For all periods presented, BancShares had 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 $3.83 billion at March 31, 2018 and $4.59 billion at December 31, 2017 were pledged as collateral to secure public funds on deposit and certain short-term borrowings, and for other purposes as required by law. On May 1, 2018, mortgage-backed securities with an amortized cost of $2.49 billion were transferred from investments available for sale to the held to maturity portfolio. At the time of transfer, the mortgage-backed securities had a fair value of $2.38 billion and a weighted average maturity of 13 years. FCB has the intent and ability to retain these securities until maturity.

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