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Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Summary of Amortized Cost of Securities and Fair Values | The amortized cost of securities and their fair values at June 30, 2017 and December 31, 2016 are shown below:
|  | June 30, 2017 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair Value |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  |  |  |  |  |
U.S. government agency securities |  | $ | 999 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 990 |
Mortgage-backed securities - residential |  |  | 416,011 |  |  |  | 679 |  |  |  | (5,982 | ) |  |  | 410,708 |
Municipals, tax exempt |  |  | 119,960 |  |  |  | 3,617 |  |  |  | (879 | ) |  |  | 122,698 |
Treasury securities |  |  | 10,325 |  |  |  | — |  |  |  | (15 | ) |  |  | 10,310 |
Total debt securities |  |  | 547,295 |  |  |  | 4,296 |  |  |  | (6,885 | ) |  |  | 544,706 |
Equity securities |  |  | 8,780 |  |  |  | 1 |  |  |  | (130 | ) |  |  | 8,651 |
Total securities available-for-sale |  | $ | 556,075 |  |  | $ | 4,297 |  |  | $ | (7,015 | ) |  | $ | 553,357 |
|  | December 31, 2016 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair Value |
Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  | $ | 998 |  |  | $ | — |  |  | $ | (13 | ) |  | $ | 985 |
Mortgage-backed securities - residential |  |  | 450,874 |  |  |  | 939 |  |  |  | (7,905 | ) |  |  | 443,908 |
Municipals, tax exempt |  |  | 116,034 |  |  |  | 3,003 |  |  |  | (2,114 | ) |  |  | 116,923 |
Treasury securities |  |  | 11,809 |  |  |  | — |  |  |  | (52 | ) |  |  | 11,757 |
Total debt securities |  |  | 579,715 |  |  |  | 3,942 |  |  |  | (10,084 | ) |  |  | 573,573 |
Equity securities |  |  | 8,744 |  |  |  | 1 |  |  |  | (135 | ) |  |  | 8,610 |
Total securities available-for-sale |  | $ | 588,459 |  |  | $ | 3,943 |  |  | $ | (10,219 | ) |  | $ | 582,183 |
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.
|  | June 30, 2017 |  |  | December 31, 2016 |
|  | Available-for-sale |  |  | Available-for-sale |
|  | Amortized cost |  |  | Fair value |  |  | Amortized cost |  |  | Fair value |
Due in one year or less |  | $ | 7,798 |  |  | $ | 7,870 |  |  | $ | 9,290 |  |  | $ | 9,352 |
Due in one to five years |  |  | 32,299 |  |  |  | 33,470 |  |  |  | 25,520 |  |  |  | 26,340 |
Due in five to ten years |  |  | 23,761 |  |  |  | 24,748 |  |  |  | 31,122 |  |  |  | 32,248 |
Due in over ten years |  |  | 67,426 |  |  |  | 67,910 |  |  |  | 62,909 |  |  |  | 61,725 |
|  |  | 131,284 |  |  |  | 133,998 |  |  |  | 128,841 |  |  |  | 129,665 |
Mortgage-backed securities - residential |  |  | 416,011 |  |  |  | 410,708 |  |  |  | 450,874 |  |  |  | 443,908 |
|  | $ | 547,295 |  |  | $ | 544,706 |  |  | $ | 579,715 |  |  | $ | 573,573 |
Summary of Sales of Available-for-Sale Securities | Sales of available-for-sale securities were as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Proceeds from sales |  | $ | 12,158 |  |  | $ | 166,732 |  |  | $ | 12,158 |  |  | $ | 268,995 |
Gross realized gains |  |  | 77 |  |  |  | 2,939 |  |  |  | 77 |  |  |  | 4,339 |
Gross realized losses |  |  | 48 |  |  |  | 348 |  |  |  | 48 |  |  |  | 348 |
Schedule of Gross Unrealized Losses | The following tables show gross unrealized losses at June 30, 2017 and December 31, 2016, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
|  | June 30, 2017 |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized loss |
U.S. government agency securities |  | $ | 990 |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | 990 |  |  | $ | 9 |
Mortgage-backed securities - residential |  |  | 366,265 |  |  |  | 5,402 |  |  |  | 17,527 |  |  |  | 580 |  |  |  | 383,792 |  |  |  | 5,982 |
Municipals, tax exempt |  |  | 32,832 |  |  |  | 868 |  |  |  | 219 |  |  |  | 11 |  |  |  | 33,051 |  |  |  | 879 |
Treasury securities |  |  | 10,310 |  |  |  | 15 |  |  |  | — |  |  |  | — |  |  |  | 10,310 |  |  | $ | 15 |
Total debt securities |  |  | 410,397 |  |  |  | 6,294 |  |  |  | 17,746 |  |  |  | 591 |  |  |  | 428,143 |  |  |  | 6,885 |
Equity securities |  |  | — |  |  |  | — |  |  |  | 3,033 |  |  |  | 130 |  |  |  | 3,033 |  |  |  | 130 |
|  | $ | 410,397 |  |  | $ | 6,294 |  |  | $ | 20,779 |  |  | $ | 721 |  |  | $ | 431,176 |  |  | $ | 7,015 |
|  | December 31, 2016 |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized loss |
U.S. government agency securities |  | $ | 985 |  |  | $ | 13 |  |  | $ | — |  |  | $ | — |  |  | $ | 985 |  |  | $ | 13 |
Mortgage-backed securities - residential |  |  | 390,595 |  |  |  | 7,230 |  |  |  | 19,073 |  |  |  | 675 |  |  |  | 409,668 |  |  |  | 7,905 |
Municipals, tax exempt |  |  | 43,132 |  |  |  | 2,114 |  |  |  | — |  |  |  | — |  |  |  | 43,132 |  |  |  | 2,114 |
Treasury securities |  |  | 10,256 |  |  |  | 52 |  |  |  | — |  |  |  | — |  |  |  | 10,256 |  |  |  | 52 |
Total debt securities |  |  | 444,968 |  |  |  | 9,409 |  |  |  | 19,073 |  |  |  | 675 |  |  |  | 464,041 |  |  |  | 10,084 |
Equity securities |  |  | — |  |  |  | — |  |  |  | 3,126 |  |  |  | 135 |  |  |  | 3,126 |  |  |  | 135 |
|  | $ | 444,968 |  |  | $ | 9,409 |  |  | $ | 22,199 |  |  | $ | 810 |  |  | $ | 467,167 |  |  | $ | 10,219 |

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