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Investment Securities and Equity Securities with Readily Determinable Fair Values | 6 Months Ended
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Jun. 30, 2019
Investment Securities |
Investment Securities | Note 6 — Investment Securities and Equity Securities with Readily Determinable Fair Values ​ We classify debt securities into one of three categories: held-to maturity, available-for-sale, or trading. Such debt securities are reassessed for appropriate classification at each reporting date. Securities classified as “held-to-maturity” are carried at amortized cost for financial statement reporting, while securities classified as “available-for-sale” and “trading” are carried at their fair value. Unrealized holding gains and losses are included in net income for those securities classified as “trading,” while unrealized holding gains and losses related to those securities classified as “available-for-sale” are excluded from net income and reported net of tax as other comprehensive income (loss) and accumulated other comprehensive income (loss) until realized, or in the case of losses, when deemed other than temporary. In accordance with the provisions of ASU 2016-01, which we adopted on January 1, 2018, unrealized holding gains and losses related to equity securities with readily determinable fair values are included in net income. ​ The amortized cost and estimated fair value by type of investment security at June 30, 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held to Maturity | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | Estimated | ​ | Carrying | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | fair value | ​ | value | ​
​ | ​ | (Dollars in Thousands) | ​
Other securities |  | $ | 2,400 |  | $ | — |  | $ | — |  | $ | 2,400 |  | $ | 2,400 | ​
Total investment securities | ​ | $ | 2,400 | ​ | $ | — | ​ | $ | — | ​ | $ | 2,400 | ​ | $ | 2,400 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for Sale Debt Securities | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | Estimated | ​ | Carrying | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | fair value | ​ | value(1) | ​
​ | ​ | (Dollars in Thousands) | ​
Residential mortgage-backed securities |  | $ | 3,348,834 |  | $ | 15,432 |  | $ | (24,046) |  | $ | 3,340,220 |  | $ | 3,340,220 | ​
Obligations of states and political subdivisions | ​ |  | 124,646 | ​ |  | 3,047 | ​ |  | — | ​ |  | 127,693 | ​ |  | 127,693 | ​
Total investment securities | ​ | $ | 3,473,480 | ​ | $ | 18,479 | ​ | $ | (24,046) | ​ | $ | 3,467,913 | ​ | $ | 3,467,913 | ​
(1) | Included in the carrying value of residential mortgage-backed securities are $544,659 of mortgage-backed securities issued by Ginnie Mae and $2,795,561 of mortgage-backed securities issued by Fannie Mae and Freddie Mac.
​ The amortized cost and estimated fair value by type of investment security at December 31, 2018 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held to Maturity | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | Estimated | ​ | Carrying | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | fair value | ​ | value | ​
​ | ​ | (Dollars in Thousands) | ​
Other securities |  | $ | 1,200 |  | $ | — |  | $ | — |  | $ | 1,200 |  | $ | 1,200 | ​
Total investment securities | ​ | $ | 1,200 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,200 | ​ | $ | 1,200 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for Sale | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Estimated | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | unrealized | ​ | unrealized | ​ | fair | ​ | Carrying | ​
​ | ​ | cost | ​ | gains | ​ | losses | ​ | value | ​ | value(1) | ​
​ | ​ | (Dollars in Thousands) | ​
Residential mortgage-backed securities |  | $ | 3,295,366 |  | $ | 6,813 |  | $ | (79,169) |  | $ | 3,223,010 |  | $ | 3,223,010 | ​
Obligations of states and political subdivisions | ​ |  | 185,799 | ​ |  | 2,646 | ​ |  | (105) | ​ |  | 188,340 | ​ |  | 188,340 | ​
Total investment securities | ​ | $ | 3,481,165 | ​ | $ | 9,459 | ​ | $ | (79,274) | ​ | $ | 3,411,350 | ​ | $ | 3,411,350 | ​
(1) | Included in the carrying value of residential mortgage-backed securities are $501,293 of mortgage-backed securities issued by Ginnie Mae and $2,721,717 of mortgage-backed securities issued by Fannie Mae and Freddie.
​ ​ The amortized cost and estimated fair value of investment securities at June 30, 2019, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held to Maturity | ​ | Available for Sale | ​
​ | ​ | Amortized | ​ | Estimated | ​ | Amortized | ​ | Estimated | ​
​ | ​ | Cost | ​ | fair value | ​ | Cost | ​ | fair value | ​
​ | ​ | (Dollars in Thousands) | ​
Due in one year or less |  | $ | 1,075 |  | $ | 1,075 |  | $ | — |  | $ | — | ​
Due after one year through five years | ​ |  | 1,325 | ​ |  | 1,325 | ​ |  | — | ​ |  | — | ​
Due after five years through ten years | ​ |  | — | ​ |  | — | ​ |  | 2,244 | ​ |  | 2,283 | ​
Due after ten years | ​ |  | — | ​ |  | — | ​ |  | 122,402 | ​ |  | 125,410 | ​
Residential mortgage-backed securities | ​ |  | — | ​ |  | — | ​ |  | 3,348,834 | ​ |  | 3,340,220 | ​
Total investment securities | ​ | $ | 2,400 | ​ | $ | 2,400 | ​ | $ | 3,473,480 | ​ | $ | 3,467,913 | ​
​ Residential mortgage-backed securities are securities primarily issued by the Federal Home Loan Mortgage Corporation (“Freddie Mac”), Federal National Mortgage Association (“Fannie Mae”), or the Government National Mortgage Association (“Ginnie Mae”). Investments in residential mortgage-backed securities issued by Ginnie Mae are fully guaranteed by the U.S. Government. Investments in residential mortgage-backed securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. Government, however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in early September 2008 and because securities issued by others that are collateralized by residential mortgage-backed securities issued by Fannie Mae or Freddie Mac are rated consistently as AAA rated securities. ​ The amortized cost and fair value of available-for-sale debt investment securities pledged to qualify for fiduciary powers, to secure public monies as required by law, repurchase agreements and short-term fixed borrowings was $1,063,745,000 and $1,057,009,000, respectively, at June 30, 2019. ​ Proceeds from the sale and calls of debt securities available-for-sale were $19,275,000 and $60,695,000 for the three and six months ended June 30, 2019, which included $0 and $0 of mortgage-backed securities, respectively. Gross gains of $1 and $3 and gross losses of $7 and $13 were realized on the sales and calls for the three and six months ended June 30, 2019, respectively. Proceeds from the sale and call of debt securities available-for-sale were $0 and $18,145,000 for the three and six months ended June 30, 2018, which included $0 and $0 of mortgage-backed securities, respectively. Gross gains of $0 and $0 and gross losses of $0 and $0 were realized on the sales and calls for the three and six months ended June 30, 2018, respectively. ​ Gross unrealized losses on debt investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position at June 30, 2019, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​
​ | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses | ​
​ | ​ | (Dollars in Thousands) | ​
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage-backed securities |  | $ | 23,726 |  | $ | (72) |  | $ | 2,080,460 |  | $ | (23,974) |  | $ | 2,104,186 |  | $ | (24,046) | ​
​ | ​ | $ | 23,726 | ​ | $ | (72) | ​ | $ | 2,080,460 | ​ | $ | (23,974) | ​ | $ | 2,104,186 | ​ | $ | (24,046) | ​
​ Gross unrealized losses on investment securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2018 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​
​ | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses | ​
​ | ​ | (Dollars in Thousands) | ​
Available for sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential mortgage-backed securities |  | $ | 208,384 |  | $ | (2,124) |  | $ | 2,537,181 |  | $ | (77,045) |  | $ | 2,745,565 |  | $ | (79,169) | ​
Obligations of states and political subdivisions | ​ |  | 12,756 | ​ |  | (99) | ​ |  | 512 | ​ |  | (6) | ​ |  | 13,268 | ​ |  | (105) | ​
​ | ​ | $ | 221,140 | ​ | $ | (2,223) | ​ | $ | 2,537,693 | ​ | $ | (77,051) | ​ | $ | 2,758,833 | ​ | $ | (79,274) | ​
​ The unrealized losses on investments in residential mortgage-backed securities are primarily caused by changes in market interest rates. Residential mortgage-backed securities are primarily securities issued by Freddie Mac, Fannie Mae and Ginnie Mae. The contractual cash obligations of the securities issued by Ginnie Mae are fully guaranteed by the U.S. Government. The contractual cash obligations of the securities issued by Freddie Mac and Fannie Mae are not fully guaranteed by the U.S. Government; however, we believe that the quality of the bonds is similar to other AAA rated bonds with limited credit risk, particularly given the placement of Fannie Mae and Freddie Mac into conservatorship by the federal government in early September 2008, and because securities issued by others that are collateralized by residential mortgage-backed securities issued by Fannie Mae and Freddie Mac are rated consistently as AAA rated securities. The decrease in fair value on residential mortgage-backed securities issued by Freddie Mac, Fannie Mae and Ginnie Mae is due to market interest rates. We have no intent to sell and will more than likely not be required to sell before a market price recovery or maturity of the securities; therefore, it is our conclusion that the investments in residential mortgage-backed securities issued by Freddie Mac, Fannie Mae and Ginnie Mae are not considered other-than-temporarily impaired. ​ Equity securities with readily determinable fair values consist primarily of Community Reinvestment Act funds. At June 30, 2019 and December 31, 2018, the balance in equity securities with readily determinable fair values recorded at fair value were $6,127,000 and $5,937,000, respectively. Prior to January 1, 2018, the equity securities were included in available-for-sale securities, with the related unrealized gain or loss recorded as a component of other comprehensive income. The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and six months ended June 30, 2019 and the three and six months ended June 30, 2018: ​
​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | June 30, 2019
​ | ​ | (Dollars in Thousands)
​ | ​ | ​
​ | ​ | ​ | ​ | ​
Net gains (losses) recognized during the period on equity securities |  | $ | ​ | 52
Less: Net gains and (losses) recognized during the period on equity securities sold during the period | ​ |  | ​ | —
​ | ​ | ​ | ​ | ​
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | ​ | 52
​
​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | June 30, 2018
​ | ​ | (Dollars in Thousands)
​ | ​ | ​
​ | ​ | ​ | ​ | ​
Net gains (losses) recognized during the period on equity securities |  | $ | ​ | (247)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period | ​ |  | ​ | —
​ | ​ | ​ | ​ | ​
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | ​ | (247)
​
​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30, 2019
​ | ​ | (Dollars in Thousands)
​ | ​ | ​
Net gains (losses) recognized during the period on equity securities |  | $ | ​ | 190
Less: Net gains and (losses) recognized during the period on equity securities sold during the period | ​ |  | ​ | —
​ | ​ | ​ | ​ | ​
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | ​ | 190
​
​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | June 30, 2018
​ | ​ | (Dollars in Thousands)
​ | ​ | ​
Net gains (losses) recognized during the period on equity securities |  | $ | ​ | (1,021)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period | ​ |  | ​ | —
​ | ​ | ​ | ​ | ​
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | ​ | $ | ​ | (1,021)
​

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