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Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (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 $ 103,303 $ 110,045 $ 107,639 $ 96,964 $ 97,619 $ 98,285 $ 93,852 $ 83,094 $ 417,951 $ 372,850 $ 322,539
Interest expense 41,779 46,044 40,317 31,933 29,319 30,266 25,246 20,676 160,074 105,507 73,042
Net interest income 61,524 64,001 67,322 65,031 68,300 68,019 68,606 62,418 257,877 267,343 249,497
Provision for loan losses 1,385 2,924 (784) 2,117 831 2,352 535 3,050 5,642 6,768 3,041
Non-interest income (1) 19,877 2,084 16,127 20,910 19,740 18,026 18,391 22,754 58,998 78,910 56,370
Non-interest expenses 57,045 57,104 53,750 52,280 54,788 61,040 50,413 49,366 220,179 215,606 178,231
Income before income taxes 22,971 6,057 30,483 31,544 32,421 22,653 36,049 32,756      
Provision for income taxes 5,109 28 6,820 7,402 10,806 14,899 12,327 7,009 19,359 45,042 45,893
Net income 17,862 6,029 23,663 24,142 21,615 7,754 23,722 25,747 71,695 78,837 78,702
Preferred stock dividends 3,615 3,615 3,615 3,615 3,615 3,615 3,615 3,615 14,459 14,459 9,515
Net income available to common shareholders $ 14,247 $ 2,414 $ 20,048 $ 20,527 $ 18,000 $ 4,139 $ 20,107 $ 22,132 $ 57,236 $ 64,378 $ 69,187
Earnings per common share:                      
Basic earnings per share (usd per share) $ 0.45 $ 0.08 $ 0.64 $ 0.65 $ 0.58 $ 0.13 $ 0.66 $ 0.73 $ 1.81 $ 2.10 $ 2.51
Diluted earnings per share (usd per share) $ 0.44 $ 0.07 $ 0.62 $ 0.64 $ 0.55 $ 0.13 $ 0.62 $ 0.67 $ 1.78 $ 1.97 $ 2.31
Loss on sale of investment securities   $ (18,659)             $ (18,659) $ 8,800 $ 25