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Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
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 |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
June 30, 2019: |  | Cost |  | Gains |  | Losses |  | Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 58,308 | ​ | $ | 260 | ​ | $ | (33) | ​ | $ | 58,535
Obligations of U.S. government corporations and agencies | ​ |  | 287,444 | ​ |  | 3,370 | ​ |  | (48) | ​ |  | 290,766
Obligations of states and political subdivisions | ​ |  | 274,301 | ​ |  | 4,683 | ​ |  | (54) | ​ |  | 278,930
Commercial mortgage-backed securities | ​ | ​ | 122,510 | ​ | ​ | 1,678 | ​ | ​ | (33) | ​ | ​ | 124,155
Residential mortgage-backed securities | ​ |  | 951,998 | ​ |  | 10,394 | ​ |  | (1,255) | ​ |  | 961,137
Corporate debt securities | ​ |  | 133,053 | ​ |  | 1,514 | ​ |  | (17) | ​ |  | 134,550
Total | ​ | $ | 1,827,614 | ​ | $ | 21,899 | ​ | $ | (1,440) | ​ | $ | 1,848,073
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Debt securities held to maturity |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Obligations of states and political subdivisions(1) | ​ | $ | 15,708 | ​ | $ | 226 | ​ | $ | — | ​ | $ | 15,934
(1) | Gross unrealized losses less than one thousand dollars.
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2018: |  | Cost |  | Gains |  | Losses |  | Value
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | ​ | $ | 25,824 | ​ | $ | 1 | ​ | $ | (414) | ​ | $ | 25,411
Obligations of U.S. government corporations and agencies | ​ |  | 53,096 | ​ |  | 7 | ​ |  | (761) | ​ |  | 52,342
Obligations of states and political subdivisions | ​ |  | 171,131 | ​ |  | 484 | ​ |  | (1,571) | ​ |  | 170,044
Commercial mortgage-backed securities | ​ | ​ | 2,003 | ​ | ​ | — | ​ | ​ | (61) | ​ | ​ | 1,942
Residential mortgage-backed securities | ​ |  | 322,646 | ​ |  | 245 | ​ |  | (7,143) | ​ |  | 315,748
Corporate debt securities | ​ |  | 132,513 | ​ |  | 61 | ​ |  | (376) | ​ |  | 132,198
Total | ​ | $ | 707,213 | ​ | $ | 798 | ​ | $ | (10,326) | ​ | $ | 697,685
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Debt securities held to maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of states and political subdivisions | ​ | $ | 33,947 | ​ | $ | 68 | ​ | $ | (87) | ​ | $ | 33,928
Commercial mortgage-backed securities | ​ | ​ | 59,054 | ​ | ​ | 11 | ​ | ​ | (1,003) | ​ | ​ | 58,062
Residential mortgage-backed securities | ​ | ​ | 515,659 | ​ | ​ | 1,748 | ​ | ​ | (6,037) | ​ | ​ | 511,370
Total | ​ | $ | 608,660 | ​ | $ | 1,827 | ​ | $ | (7,127) | ​ | $ | 603,360
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 | ​ | Debt securities held to maturity
​ |  | Amortized |  | Fair |  | Amortized |  | Fair
June 30, 2019: |  | Cost |  | Value |  | Cost |  | Value
Due in one year or less | ​ | $ | 220,023 | ​ | $ | 220,304 | ​ | $ | 2,724 | ​ | $ | 2,729
Due after one year through five years | ​ |  | 418,649 | ​ |  | 424,241 | ​ |  | 11,861 | ​ |  | 12,035
Due after five years through ten years | ​ |  | 263,388 | ​ |  | 267,989 | ​ |  | 1,123 | ​ |  | 1,170
Due after ten years | ​ |  | 925,554 | ​ |  | 935,539 | ​ |  | — | ​ |  | —
Total | ​ | $ | 1,827,614 | ​ | $ | 1,848,073 | ​ | $ | 15,708 | ​ | $ | 15,934
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,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Gross security gains | ​ | $ | 391 | ​ | $ | — | ​ | $ | 391 | ​ | $ | —
Gross security (losses) | ​ | ​ | (401) |  | ​ | — |  | ​ | (584) |  | ​ | —
Net (losses) gains on sales of securities(1) | ​ | $ | (10) | ​ | $ | — | ​ | $ | (193) | ​ | $ | —
| (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 | Information pertaining to debt securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For less than | ​ | For greater | ​ | ​ | ​ | ​ | ​ | ​
​ | 12 months, gross | ​ | than 12 months, gross | ​ | Total, gross
​ | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
June 30, 2019: | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | $ | — | ​ | $ | — | ​ | $ | 24,768 | ​ | $ | (33) | ​ | $ | 24,768 | ​ | $ | (33)
Obligations of U.S. government corporations and agencies(1) | ​ | 51 | ​ | ​ | — | ​ | ​ | 22,468 | ​ | ​ | (48) | ​ | ​ | 22,519 | ​ | ​ | (48)
Obligations of states and political subdivisions | ​ | 1,394 | ​ | ​ | (8) | ​ | ​ | 24,192 | ​ | ​ | (46) | ​ | ​ | 25,586 | ​ | ​ | (54)
Commercial mortgage-backed securities | ​ | — | ​ | ​ | — | ​ | ​ | 14,746 | ​ | ​ | (33) | ​ | ​ | 14,746 | ​ | ​ | (33)
Residential mortgage-backed securities |  | 13,629 | ​ |  | (8) | ​ |  | 183,552 | ​ |  | (1,247) | ​ |  | 197,181 | ​ |  | (1,255)
Corporate debt securities |  | 1,765 | ​ |  | (7) | ​ |  | 15,049 | ​ |  | (10) | ​ |  | 16,814 | ​ |  | (17)
Total temporarily impaired securities | $ | 16,839 | ​ | $ | (23) | ​ | $ | 284,775 | ​ | $ | (1,417) | ​ | $ | 301,614 | ​ | $ | (1,440)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Debt securities held to maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of states and political subdivisions(1) | $ | — | ​ | $ | — | ​ | $ | 500 | ​ | $ | — | ​ | $ | 500 | ​ | $ | —
| (1) | Unrealized losses less than one thousand dollars.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | For less than | ​ | For greater | ​ | ​ | ​ | ​ | ​ | ​
​ | 12 months, gross | ​ | than 12 months, gross | ​ | Total, gross
​ | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
December 31, 2018: | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Debt securities available for sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities | $ | 995 | ​ | $ | (4) | ​ | $ | 24,343 | ​ | $ | (410) | ​ | $ | 25,338 | ​ | $ | (414)
Obligations of U.S. government corporations and agencies | ​ | 749 | ​ | ​ | (3) | ​ | ​ | 50,744 | ​ | ​ | (758) | ​ | ​ | 51,493 | ​ | ​ | (761)
Obligations of states and political subdivisions | ​ | 49,893 | ​ | ​ | (460) | ​ | ​ | 77,651 | ​ | ​ | (1,111) | ​ | ​ | 127,544 | ​ | ​ | (1,571)
Commercial mortgage-backed securities | ​ | — | ​ | ​ | — | ​ | ​ | 1,942 | ​ | ​ | (61) | ​ | ​ | 1,942 | ​ | ​ | (61)
Residential mortgage-backed securities |  | 48,387 | ​ |  | (496) | ​ |  | 247,573 | ​ |  | (6,647) | ​ |  | 295,960 | ​ |  | (7,143)
Corporate debt securities |  | 90,713 | ​ |  | (268) | ​ |  | 15,083 | ​ |  | (108) | ​ |  | 105,796 | ​ |  | (376)
Total temporarily impaired securities | $ | 190,737 | ​ | $ | (1,231) | ​ | $ | 417,336 | ​ | $ | (9,095) | ​ | $ | 608,073 | ​ | $ | (10,326)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Debt securities held to maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of states and political subdivisions | $ | 9,531 | ​ | $ | (33) | ​ | $ | 9,538 | ​ | $ | (54) | ​ | $ | 19,069 | ​ | $ | (87)
Commercial mortgage-backed securities | ​ | 12,067 | ​ | ​ | (212) | ​ | ​ | 45,041 | ​ | ​ | (791) | ​ | ​ | 57,108 | ​ | ​ | (1,003)
Residential mortgage-backed securities | ​ | 77,071 | ​ | ​ | (974) | ​ | ​ | 245,128 | ​ | ​ | (5,063) | ​ | ​ | 322,199 | ​ | ​ | (6,037)
Total temporarily impaired securities | $ | 98,669 | ​ | $ | (1,219) | ​ | $ | 299,707 | ​ | $ | (5,908) | ​ | $ | 398,376 | ​ | $ | (7,127)

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