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Quarterly Results of Operations (Unaudited) (Details) - 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 | $ 108,653 | $ 104,800 | $ 100,871 | $ 93,620 | $ 90,348 | $ 84,847 | $ 71,467 | $ 68,234 | $ 407,944 | $ 314,896 | $ 253,312
Interest expense | 20,769 | 18,314 | 16,300 | 13,704 | 11,583 | 10,427 | 8,367 | 7,235 | 69,087 | 37,612 | 26,839
NET INTEREST INCOME | 87,884 | 86,486 | 84,571 | 79,916 | 78,765 | 74,420 | 63,100 | 60,999 | 338,857 | 277,284 | 226,473
Provision for loan losses | 1,664 | 1,400 | 1,663 | 2,500 | 1,800 | 2,083 | 2,875 | 2,385 | 7,227 | 9,143 | 5,657
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES | 86,220 | 85,086 | 82,908 | 77,416 | 76,965 | 72,337 | 60,225 | 58,614 | 331,630 | 268,141 | 220,816
Non-interest income | 19,180 | 19,527 | 18,191 | 19,561 | 19,061 | 18,668 | 18,434 | 14,846 | 76,459 | 71,009 | 65,203
Non-interest expense | 57,738 | 55,022 | 53,504 | 53,687 | 56,433 | 58,708 | 47,316 | 43,099 | 219,951 | 205,556 | 177,359
INCOME BEFORE INCOME TAX | 47,662 | 49,591 | 47,595 | 43,290 | 39,593 | 32,297 | 31,343 | 30,361 |  |  |
Income tax expense | 5,949 | 8,478 | 7,961 | 6,611 | 15,210 | 7,939 | 7,207 | 7,168 | 28,999 | 37,524 | 27,609
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS | $ 41,713 | $ 41,113 | $ 39,634 | $ 36,679 | $ 24,383 | $ 24,358 | $ 24,136 | $ 23,193 | $ 159,139 | $ 96,070 | $ 81,051
Basic EPS (in dollars per share) | $ 0.85 | $ 0.83 | $ 0.80 | $ 0.75 | $ 0.49 | $ 0.50 | $ 0.57 | $ 0.57 | $ 3.23 | $ 2.13 | $ 1.99
Diluted EPS (in dollars per share) | $ 0.85 | $ 0.83 | $ 0.80 | $ 0.74 | $ 0.49 | $ 0.50 | $ 0.57 | $ 0.56 | $ 3.22 | $ 2.12 | $ 1.98
Average Shares Outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 49,314,276 | 49,286,945 | 49,252,580 | 49,192,647 | 49,144,310 | 48,431,880 | 42,038,824 | 40,984,481 | 49,262,015 | 45,181,221 | 40,767,343
Diluted (in shares) | 49,511,233 | 49,492,019 | 49,451,406 | 49,427,972 | 49,379,303 | 48,643,774 | 42,243,539 | 41,220,586 | 49,470,923 | 45,402,978 | 41,013,133

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