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Quarterly Financial Data (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 $ 172,026 $ 167,826 $ 159,910 $ 150,410 $ 153,185 $ 147,643 $ 138,533 $ 132,743 $ 650,172 $ 572,104 $ 421,934
Interest expense 50,133 44,679 37,091 30,342 26,793 24,380 21,713 17,838 162,245 90,724 58,579
NET INTEREST INCOME BEFORE PROVISION FOR LOAN LOSSES 121,893 123,147 122,819 120,068 126,392 123,263 116,820 114,905 487,927 481,380 363,355
Provision for loan losses 2,800 7,300 2,300 2,500 3,600 5,400 2,760 5,600 14,900 17,360 9,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES 119,093 115,847 120,519 117,568 122,792 117,863 114,060 109,305 473,027 464,020 354,355
Noninterest income 11,614 13,447 15,269 19,850 16,451 16,246 16,115 17,603 60,180 66,415 51,819
Noninterest expense 70,189 67,455 71,629 68,453 73,028 61,837 64,037 67,699 277,726 266,601 214,975
INCOME BEFORE INCOME TAX PROVISION 60,518 61,839 64,159 68,965 66,215 72,272 66,138 59,209 255,481 263,834 191,199
Income tax provision 16,069 15,461 16,629 17,733 48,231 27,708 25,451 22,999 65,892 124,389 77,452
NET INCOME $ 44,449 $ 46,378 $ 47,530 $ 51,232 $ 17,984 $ 44,564 $ 40,687 $ 36,210 $ 189,589 $ 139,445 $ 113,747
Basic EPS - common stock (in dollars per share) $ 0.35 $ 0.36 $ 0.36 $ 0.38 $ 0.13 $ 0.33 $ 0.30 $ 0.27 $ 1.44 $ 1.03 $ 1.10
Diluted EPS - common stock (in dollars per share) $ 0.35 $ 0.36 $ 0.36 $ 0.38 $ 0.13 $ 0.33 $ 0.30 $ 0.27 $ 1.44 $ 1.03 $ 1.10