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Unaudited Quarterly Financial Data (Condensed) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Quarterly Financial Data (Condensed) | Unaudited Quarterly Financial Data (Condensed) Summarized unaudited quarterly financial data is as follows:
| Quarters ended 2018
(Dollars in thousands, except per share data) | March 31 |  | June 30 |  | September 30 |  | December 31
Interest income | $ | 103,066 |  |  | 117,715 |  |  | 122,905 |  |  | 125,310 |
Interest expense | 7,774 |  |  | 9,161 |  |  | 9,160 |  |  | 9,436 |
Net interest income | 95,292 |  |  | 108,554 |  |  | 113,745 |  |  | 115,874 |
Provision for loan losses | 795 |  |  | 4,718 |  |  | 3,194 |  |  | 1,246 |
Net interest income after provision for loan losses | 94,497 |  |  | 103,836 |  |  | 110,551 |  |  | 114,628 |
Non-interest income | 26,086 |  |  | 31,828 |  |  | 32,416 |  |  | 28,494 |
Non-interest expense | 73,627 |  |  | 81,795 |  |  | 82,829 |  |  | 81,876 |
Income before income taxes | 46,956 |  |  | 53,869 |  |  | 60,138 |  |  | 61,246 |
Federal and state income tax expense | 8,397 |  |  | 9,485 |  |  | 10,802 |  |  | 11,647 |
Net income | $ | 38,559 |  |  | 44,384 |  |  | 49,336 |  |  | 49,599 |
Basic earnings per share | $ | 0.48 |  |  | 0.53 |  |  | 0.58 |  |  | 0.59 |
Diluted earnings per share | $ | 0.48 |  |  | 0.52 |  |  | 0.58 |  |  | 0.59 |
| Quarters ended 2017
(Dollars in thousands, except per share data) | March 31 |  | June 30 |  | September 30 |  | December 31
Interest income | $ | 87,628 |  |  | 94,032 |  |  | 96,464 |  |  | 96,898 |
Interest expense | 7,366 |  |  | 7,774 |  |  | 7,652 |  |  | 7,072 |
Net interest income | 80,262 |  |  | 86,258 |  |  | 88,812 |  |  | 89,826 |
Provision for loan losses | 1,598 |  |  | 3,013 |  |  | 3,327 |  |  | 2,886 |
Net interest income after provision for loan losses | 78,664 |  |  | 83,245 |  |  | 85,485 |  |  | 86,940 |
Non-interest income | 25,689 |  |  | 27,656 |  |  | 31,185 |  |  | 27,709 |
Non-interest expense | 63,344 |  |  | 65,309 |  |  | 68,552 |  |  | 68,366 |
Income before income taxes | 41,009 |  |  | 45,592 |  |  | 48,118 |  |  | 46,283 |
Federal and state income tax expense | 9,754 |  |  | 11,905 |  |  | 11,639 |  |  | 31,327 |
Net income | $ | 31,255 |  |  | 33,687 |  |  | 36,479 |  |  | 14,956 |
Basic earnings per share | $ | 0.41 |  |  | 0.43 |  |  | 0.47 |  |  | 0.19 |
Diluted earnings per share | $ | 0.41 |  |  | 0.43 |  |  | 0.47 |  |  | 0.19 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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