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Investment securities | 6 Months Ended
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Jun. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Investment securities | Note (3)—Investment securities: 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 |
Securities pledged at June 30, 2017 and December 31, 2016 had a carrying amount of $380,751 and $390,814, respectively, and were pledged to secure Federal Home Loan Bank advances, a Federal Reserve Bank line of credit, public deposits and repurchase agreements. The amortized cost and fair value of debt securities by contractual maturity at June 30, 2017 and December 31, 2016 are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgage underlying the security may be called or repaid without any penalties. 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 |
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 |
The Company also recognized $1 in gains related to the early call of available for sale securities during the six months ended June 30, 2017. 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 |
As of June 30, 2017 and December 31, 2016, the Company’s securities portfolio consisted of 314 and 329 securities, 120 and 151 of which were in an unrealized loss position, respectively. The Company evaluates securities with unrealized losses for other-than-temporary impairment (OTTI), and the Company recorded no OTTI for the three and six months ended June 30, 2017 and 2016. The unrealized losses associated with these investment securities are primarily driven by interest rates and are not due to the credit quality of the securities. For debt securities, the Company currently does not intend to sell those investments with unrealized losses, and it is unlikely that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. For equity securities, the Company has evaluated the near-term prospects of the investment in relation to the severity and duration of the impairment and based on that evaluation has the ability and intent to hold these investments until a recovery of fair value.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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