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Securities (Tables) | 6 Months Ended
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Jun. 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
June 30, 2020: |  | Cost |  | Gains |  | Losses | ​ | ​ | Losses | ​ | Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 32,597 | ​ | $ | 639 | ​ | $ | — | ​ | $ | — | ​ | $ | 33,236
Obligations of U.S. government corporations and agencies | ​ |  | 77,349 | ​ |  | 2,752 | ​ |  | (57) | ​ | ​ | — | ​ |  | 80,044
Obligations of states and political subdivisions | ​ |  | 272,885 | ​ |  | 10,047 | ​ |  | (38) | ​ | ​ | — | ​ |  | 282,894
Commercial mortgage-backed securities | ​ | ​ | 230,352 | ​ | ​ | 10,956 | ​ | ​ | (3) | ​ | ​ | — | ​ | ​ | 241,305
Residential mortgage-backed securities | ​ |  | 940,842 | ​ |  | 29,475 | ​ |  | (124) | ​ | ​ | — | ​ |  | 970,193
Corporate debt securities | ​ |  | 87,404 | ​ |  | 1,826 | ​ |  | (36) | ​ | ​ | — | ​ |  | 89,194
Total | ​ | $ | 1,641,429 | ​ | $ | 55,695 | ​ | $ | (258) | ​ | $ | — | ​ | $ | 1,696,866
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | 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 agencies and corporations (dollars in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Debt securities available for sale
​ |  | Amortized |  | Fair
June 30, 2020: |  | Cost |  | Value
Due in one year or less | ​ | $ | 132,192 | ​ | $ | 133,749
Due after one year through five years | ​ |  | 241,337 | ​ |  | 250,413
Due after five years through ten years | ​ |  | 241,496 | ​ |  | 252,566
Due after ten years | ​ |  | 1,026,404 | ​ |  | 1,060,138
Total | ​ | $ | 1,641,429 | ​ | $ | 1,696,866
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 June 30, | Six Months Ended June 30,
​ |  | 2020 |  | 2019 | 2020 |  | 2019
Gross security gains | ​ | $ | 146 | ​ | $ | 391 | $ | 1,707 | ​ | $ | 391
Gross security (losses) | ​ | ​ | (3) |  | ​ | (400) | ​ | (8) |  | ​ | (583)
Net gains (losses) on sales of securities(1) | ​ | $ | 143 | ​ | $ | (9) | $ | 1,699 | ​ | $ | (192)
| (1) | Net (losses) gains 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
June 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 | ​ | 5,648 | ​ | ​ | (57) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,648 | ​ | ​ | (57)
Obligations of states and political subdivisions | ​ | 6,432 | ​ | ​ | (38) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,432 | ​ | ​ | (38)
Commercial mortgage-backed securities | ​ | 4,963 | ​ | ​ | (3) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,963 | ​ | ​ | (3)
Residential mortgage-backed securities |  | 35,830 | ​ |  | (120) | ​ |  | 937 | ​ |  | (4) | ​ |  | 36,767 | ​ |  | (124)
Corporate debt securities |  | 4,222 | ​ |  | (36) | ​ |  | — | ​ |  | — | ​ |  | 4,222 | ​ |  | (36)
Total temporarily impaired securities | $ | 57,095 | ​ | $ | (254) | ​ | $ | 937 | ​ | $ | (4) | ​ | $ | 58,032 | ​ | $ | (258)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | 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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