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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Schedule of quarterly results of operations (unaudited) | The following table reports quarterly results of operations (unaudited) for 2017, 2016 and 2015:
|  | 2017 |
(dollars in thousands except per share data) |  | Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter |
Total interest income |  | $ | 86,526 |  | $ | 82,370 |  | $ | 79,344 |  | $ | 75,794 |
Total interest expense |  | 11,167 |  | 10,434 |  | 9,646 |  | 8,900 |
Net interest income |  | 75,359 |  | 71,936 |  | 69,698 |  | 66,894 |
Provision for credit losses |  | 4,087 |  | 1,921 |  | 1,566 |  | 1,397 |
Net interest income after provision for credit losses |  | 71,272 |  | 70,015 |  | 68,132 |  | 65,497 |
Noninterest income |  | 9,496 |  | 6,784 |  | 7,023 |  | 6,070 |
Noninterest expense |  | 29,803 |  | 29,516 |  | 30,001 |  | 29,232 |
Income before income tax expense |  | 50,965 |  | 47,283 |  | 45,154 |  | 42,335 |
Income tax expense |  | 35,396 |  | 17,409 |  | 17,382 |  | 15,318 |
Net income |  | 15,569 |  | 29,874 |  | 27,772 |  | 27,017 |
Net income available to common shareholders |  | $ | 15,569 |  | $ | 29,874 |  | $ | 27,772 |  | $ | 27,017 |
Earnings per common share |  |  |  |  |  |  |  |  |
Basic (1) |  | $ | 0.46 |  | $ | 0.87 |  | $ | 0.81 |  | $ | 0.79 |
Diluted (1) |  | $ | 0.45 |  | $ | 0.87 |  | $ | 0.81 |  | $ | 0.79 |
|  | 2016 |
(dollars in thousands except per share data) |  | Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter |
Total interest income |  | $ | 75,795 |  | $ | 72,431 |  | $ | 69,772 |  | $ | 67,807 |
Total interest expense |  | 8,771 |  | 7,703 |  | 5,950 |  | 5,216 |
Net interest income |  | 67,024 |  | 64,728 |  | 63,822 |  | 62,591 |
Provision for credit losses |  | 2,112 |  | 2,288 |  | 3,888 |  | 3,043 |
Net interest income after provision for credit losses |  | 64,912 |  | 62,440 |  | 59,934 |  | 59,548 |
Noninterest income |  | 7,014 |  | 6,405 |  | 7,575 |  | 6,290 |
Noninterest expense |  | 29,780 |  | 28,838 |  | 28,295 |  | 28,103 |
Income before income tax expense |  | 42,146 |  | 40,007 |  | 39,214 |  | 37,735 |
Income tax expense |  | 16,429 |  | 15,484 |  | 15,069 |  | 14,413 |
Net income |  | 25,717 |  | 24,523 |  | 24,145 |  | 23,322 |
Net income available to common shareholders |  | $ | 25,717 |  | $ | 24,523 |  | $ | 24,145 |  | $ | 23,322 |
Earnings per common share |  |  |  |  |  |  |  |  |
Basic (1) |  | $ | 0.76 |  | $ | 0.73 |  | $ | 0.72 |  | $ | 0.70 |
Diluted (1) |  | $ | 0.75 |  | $ | 0.72 |  | $ | 0.71 |  | $ | 0.68 |
|  | 2015 |
(dollars in thousands except per share data) |  | Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter |
Total interest income |  | $ | 67,311 |  | $ | 63,981 |  | $ | 62,423 |  | $ | 59,465 |
Total interest expense |  | 4,735 |  | 4,896 |  | 4,873 |  | 4,734 |
Net interest income |  | 62,576 |  | 59,085 |  | 57,550 |  | 54,731 |
Provision for credit losses |  | 4,595 |  | 3,262 |  | 3,471 |  | 3,310 |
Net interest income after provision for credit losses |  | 57,981 |  | 55,823 |  | 54,079 |  | 51,421 |
Noninterest income |  | 6,492 |  | 6,099 |  | 6,233 |  | 7,804 |
Noninterest expense |  | 28,640 |  | 27,405 |  | 26,598 |  | 28,073 |
Income before income tax expense |  | 35,833 |  | 34,517 |  | 33,714 |  | 31,152 |
Income tax expense |  | 13,485 |  | 13,054 |  | 12,776 |  | 11,734 |
Net income |  | 22,348 |  | 21,463 |  | 20,938 |  | 19,418 |
Preferred stock dividends and discount accretion |  | 62 |  | 180 |  | 179 |  | 180 |
Net income available to common shareholders |  | $ | 22,286 |  | $ | 21,283 |  | $ | 20,759 |  | $ | 19,238 |
Earnings per common share |  |  |  |  |  |  |  |  |
Basic (1) |  | $ | 0.67 |  | $ | 0.64 |  | $ | 0.62 |  | $ | 0.62 |
Diluted (1) |  | $ | 0.65 |  | $ | 0.63 |  | $ | 0.61 |  | $ | 0.61 |
(1) Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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