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Selected Consolidated Quarterly Financial Data - Summary of Consolidated Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 72,358 | $ 71,382 | $ 70,078 | $ 62,837 | $ 47,906 | $ 48,030 | $ 46,879 | $ 46,014 | $ 276,654 | $ 188,829 | $ 133,425
Interest expense | 10,517 | 9,878 | 8,631 | 7,126 | 5,401 | 4,974 | 4,705 | 4,531 | 36,152 | 19,611 | 13,163
Net interest income | 61,841 | 61,504 | 61,447 | 55,711 | 42,505 | 43,056 | 42,174 | 41,483 | 240,502 | 169,218 | 120,262
Provision for loan losses | 506 | 907 | 706 | 1,371 | 1,415 | 1,165 | 1,165 | 700 | 3,490 | 4,445 | 2,623
Net interest income after provision for loan losses | 61,335 | 60,597 | 60,741 | 54,340 | 41,090 | 41,891 | 41,009 | 40,783 | 237,012 | 164,773 | 117,639
Other income | 8,748 | 8,285 | 8,883 | 8,910 | 6,745 | 7,359 | 6,973 | 5,995 |  |  |
Operating expenses (excluding merger related expenses) | 37,794 | 37,503 | 42,470 | 38,508 | 26,434 | 27,580 | 28,527 | 29,481 | 186,337 | 126,520 | 102,852
Merger related expenses | 1,288 | 2,030 | 8,434 | 18,310 | 1,259 | 3,153 | 8,606 | 1,480 | 26,911 | 8,293 | 16,534
Income before provision for income taxes | 31,001 | 29,439 | 18,720 | 6,432 | 20,142 | 18,517 | 10,849 | 15,817 |  |  |
Provision for income taxes | 4,269 | 5,278 | 3,018 | 1,005 | 10,186 | 5,700 | 3,170 | 3,799 | 13,570 | 22,855 | 12,153
Net income | $ 26,732 | $ 24,071 | $ 15,702 | $ 5,427 | $ 9,956 | $ 12,817 | $ 7,679 | $ 12,018 | $ 71,932 | $ 42,470 | $ 23,046
Basic earnings per share (in dollars per share) | $ 0.56 | $ 0.50 | $ 0.33 | $ 0.12 | $ 0.31 | $ 0.40 | $ 0.24 | $ 0.38 | $ 1.54 | $ 1.32 | $ 1.00
Diluted earnings per share (in dollars per share) | $ 0.55 | $ 0.50 | $ 0.32 | $ 0.12 | $ 0.30 | $ 0.39 | $ 0.23 | $ 0.36 | $ 1.51 | $ 1.28 | $ 0.98

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