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Selected Quarterly Financial Data (Unaudited) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 100,150 $ 93,453 $ 81,537 $ 88,169 $ 90,385 $ 93,026 $ 95,648 $ 92,411 $ 363,309 $ 371,470 $ 359,829
Interest expense 11,412 11,468 11,709 16,148 17,502 19,498 19,093 17,404 50,739 73,497 59,153
Net interest income 88,738 81,985 69,828 72,021 72,883 73,528 76,555 75,007 312,570 297,973 300,676
Provision for credit losses (2,298) 6,400 10,900 14,717 2,900 500 9,500 200 29,719 13,100 23,700
Net interest income after provision for credit losses 91,036 75,585 58,928 57,304 69,983 73,028 67,055 74,807 282,851 284,873 276,976
Non-interest income 20,448 20,626 14,365 16,991 17,725 18,047 15,834 12,188 72,431 63,794 58,676
Non-interest expense 58,571 59,783 55,267 54,107 53,731 49,738 49,694 48,416 227,728 201,579 191,735
Income before income tax expense 52,913 36,428 18,026 20,188 33,977 41,337 33,195 38,579 127,554 147,088 143,917
Income tax expense 12,346 9,285 3,715 5,257 8,026 9,938 8,802 7,689 30,603 34,455 25,530
Net income $ 40,567 $ 27,143 $ 14,311 $ 14,931 $ 25,951 $ 31,399 $ 24,393 $ 30,890 $ 96,951 $ 112,633 $ 118,387
Basic earnings per share (in dollars per share) $ 0.53 $ 0.37 $ 0.22 $ 0.23 $ 0.40 $ 0.49 $ 0.38 $ 0.48 $ 1.39 $ 1.74 $ 1.82
Diluted earnings per share (in dollars per share) $ 0.53 $ 0.37 $ 0.22 $ 0.23 $ 0.40 $ 0.49 $ 0.38 $ 0.48 $ 1.39 $ 1.74 $ 1.82