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Securities (Tables) | 9 Months Ended
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Sep. 30, 2020
Securities |
Schedule of amortized cost, unrealized gains and losses and fair values of securities classified available for sale and held to maturity | The table below provides the amortized cost, unrealized gains and losses and fair values of debt securities summarized by major category (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross | ​ | ​ | Allowance |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | for Credit | ​ | Fair
September 30, 2020: |  | Cost |  | Gains |  | Losses | ​ | ​ | Losses | ​ | Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 29,442 | ​ | $ | 495 | ​ | $ | — | ​ | $ | — | ​ | $ | 29,937
Obligations of U.S. government corporations and agencies | ​ |  | 76,021 | ​ |  | 2,512 | ​ |  | (55) | ​ | ​ | — | ​ |  | 78,478
Obligations of states and political subdivisions | ​ |  | 304,749 | ​ |  | 11,380 | ​ |  | (9) | ​ | ​ | — | ​ |  | 316,120
Commercial mortgage-backed securities | ​ | ​ | 346,543 | ​ | ​ | 10,804 | ​ | ​ | (104) | ​ | ​ | — | ​ | ​ | 357,243
Residential mortgage-backed securities | ​ |  | 1,192,131 | ​ |  | 26,699 | ​ |  | (304) | ​ | ​ | — | ​ |  | 1,218,526
Corporate debt securities | ​ |  | 78,930 | ​ |  | 1,619 | ​ |  | (4) | ​ | ​ | — | ​ |  | 80,545
Total | ​ | $ | 2,027,816 | ​ | $ | 53,509 | ​ | $ | (476) | ​ | $ | — | ​ | $ | 2,080,849
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2019: |  | Cost |  | Gains |  | Losses |  | Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 51,472 | ​ | $ | 265 | ​ | $ | — | ​ | $ | 51,737
Obligations of U.S. government corporations and agencies | ​ |  | 160,364 | ​ |  | 2,684 | ​ |  | (48) | ​ |  | 163,000
Obligations of states and political subdivisions | ​ |  | 262,492 | ​ |  | 5,810 | ​ |  | (11) | ​ |  | 268,291
Commercial mortgage-backed securities | ​ | ​ | 137,733 | ​ | ​ | 1,700 | ​ | ​ | (146) | ​ | ​ | 139,287
Residential mortgage-backed securities | ​ |  | 912,308 | ​ |  | 10,282 | ​ |  | (624) | ​ |  | 921,966
Corporate debt securities | ​ |  | 102,696 | ​ |  | 1,280 | ​ |  | — | ​ |  | 103,976
Total | ​ | $ | 1,627,065 | ​ | $ | 22,021 | ​ | $ | (829) | ​ | $ | 1,648,257
Schedule of amortized cost and fair value of debt securities available for sale and held to maturity by contractual maturity | ​ ​ The amortized cost and fair value of debt securities, by contractual maturity or pre-refunded date, are shown below. Mortgages underlying mortgage-backed securities may be called or prepaid; therefore, actual maturities could differ from the contractual maturities. All mortgage-backed securities were issued by U.S. government corporations and agencies (dollars in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Debt securities available for sale
​ |  | Amortized |  | Fair
September 30, 2020: |  | Cost |  | Value
Due in one year or less | ​ | $ | 148,312 | ​ | $ | 149,872
Due after one year through five years | ​ |  | 210,254 | ​ |  | 219,106
Due after five years through ten years | ​ |  | 260,947 | ​ |  | 272,794
Due after ten years | ​ |  | 1,408,303 | ​ |  | 1,439,077
Total | ​ | $ | 2,027,816 | ​ | $ | 2,080,849
Schedule of realized gains and losses related to sales of securities | Realized gains and losses related to sales and calls of debt securities available for sale are summarized as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | Nine Months Ended September 30,
​ |  | 2020 |  | 2019 | 2020 |  | 2019
Gross security gains | ​ | $ | 11 | ​ | $ | 298 | $ | 1,718 | ​ | $ | 689
Gross security (losses) | ​ | ​ | — |  | ​ | (1) | ​ | (8) |  | ​ | (585)
Net gains (losses) on sales of securities(1) | ​ | $ | 11 | ​ | $ | 297 | $ | 1,710 | ​ | $ | 104
| (1) | Net gains (losses) on sales of securities reported on the unaudited Consolidated Statements of Income includes sale of equity securities, excluded in this table.
Schedule of securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position | The following information pertains to debt securities with gross unrealized losses, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Less than 12 months, gross | ​ | 12 months or more, gross | ​ | Total, gross
​ | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
September 30, 2020: | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Obligations of U.S. government corporations and agencies | ​ | — | ​ | ​ | — | ​ | ​ | 5,479 | ​ | ​ | (55) | ​ | ​ | 5,479 | ​ | ​ | (55)
Obligations of states and political subdivisions | ​ | 3,810 | ​ | ​ | (9) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,810 | ​ | ​ | (9)
Commercial mortgage-backed securities | ​ | 53,690 | ​ | ​ | (104) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 53,690 | ​ | ​ | (104)
Residential mortgage-backed securities |  | 152,298 | ​ |  | (301) | ​ |  | 838 | ​ |  | (3) | ​ |  | 153,136 | ​ |  | (304)
Corporate debt securities |  | 7,563 | ​ |  | (4) | ​ |  | — | ​ |  | — | ​ |  | 7,563 | ​ |  | (4)
Total temporarily impaired securities | $ | 217,361 | ​ | $ | (418) | ​ | $ | 6,317 | ​ | $ | (58) | ​ | $ | 223,678 | ​ | $ | (476)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Less than 12 months, gross | ​ | 12 months or more, gross | ​ | Total, gross
​ | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
December 31, 2019: | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Obligations of U.S. government corporations and agencies | ​ | 6,362 | ​ | ​ | (48) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,362 | ​ | ​ | (48)
Obligations of states and political subdivisions(1) | ​ | 4,981 | ​ | ​ | (11) | ​ | ​ | 1,548 | ​ | ​ | — | ​ | ​ | 6,529 | ​ | ​ | (11)
Commercial mortgage-backed securities | ​ | 33,322 | ​ | ​ | (144) | ​ | ​ | 2,044 | ​ | ​ | (2) | ​ | ​ | 35,366 | ​ | ​ | (146)
Residential mortgage-backed securities |  | 78,326 | ​ |  | (245) | ​ |  | 50,259 | ​ |  | (379) | ​ |  | 128,585 | ​ |  | (624)
Corporate debt securities |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Total temporarily impaired securities | $ | 122,991 | ​ | $ | (448) | ​ | $ | 53,851 | ​ | $ | (381) | ​ | $ | 176,842 | ​ | $ | (829)
| (1) | Unrealized losses for 12 months or more, gross, was less than one thousand dollars.

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