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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of the Unaudited Quarterly Results of Operations | A summary of the unaudited quarterly results of operations for the years ended December 31, 2018 and 2017 is as follows:
|  | Quarter |
|  | Fourth |  |  | Third |  |  | Second |  |  | First |
|  | (Dollars in thousands, except per share data) |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  | $ | 66,888 |  |  | $ | 65,673 |  |  | $ | 64,880 |  |  | $ | 63,035 |
Provision for loan losses |  |  | 1,516 |  |  |  | 747 |  |  |  | 1,225 |  |  |  | 314 |
Securities transactions |  |  | 10 |  |  |  | (64 | ) |  |  | 115 |  |  |  | (14 | )
Noninterest income |  |  | 31,851 |  |  |  | 32,801 |  |  |  | 30,437 |  |  |  | 30,110 |
Noninterest expense |  |  | 56,166 |  |  |  | 55,809 |  |  |  | 54,256 |  |  |  | 55,890 |
Net income |  |  | 32,725 |  |  |  | 32,883 |  |  |  | 30,586 |  |  |  | 29,620 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 1.00 |  |  |  | 1.01 |  |  |  | 0.93 |  |  |  | 0.91 |
Diluted |  |  | 0.98 |  |  |  | 0.98 |  |  |  | 0.91 |  |  |  | 0.89 |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  | $ | 58,699 |  |  | $ | 57,233 |  |  | $ | 56,439 |  |  | $ | 54,768 |
Provision for loan losses |  |  | 3,323 |  |  |  | 3,276 |  |  |  | 1,841 |  |  |  | 72 |
Securities transactions |  |  | 4,412 |  |  |  | (22 | ) |  |  | (330 | ) |  |  | — |
Noninterest income |  |  | 32,833 |  |  |  | 29,169 |  |  |  | 27,983 |  |  |  | 28,085 |
Noninterest expense |  |  | 51,251 |  |  |  | 50,600 |  |  |  | 48,953 |  |  |  | 49,588 |
Net income |  |  | 19,497 |  |  |  | 21,710 |  |  |  | 23,182 |  |  |  | 22,050 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.61 |  |  |  | 0.68 |  |  |  | 0.73 |  |  |  | 0.70 |
Diluted |  |  | 0.59 |  |  |  | 0.67 |  |  |  | 0.71 |  |  |  | 0.68 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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