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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, 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 $ 153,093 $ 139,650 $ 125,218 $ 125,343 $ 123,995 $ 126,718 $ 111,950 $ 101,075 $ 543,304 $ 463,739 $ 417,951
Interest expense 30,147 32,211 33,236 44,022 46,402 50,983 47,271 41,771 139,616 186,429 160,074
Net interest income 122,946 107,439 91,982 81,321 77,593 75,735 64,679 59,304 403,688 277,310 257,877
Provision for credit losses on loans and leases (2,913) 12,955 20,946 31,786 9,689 4,426 5,346 4,767 62,774 24,227 5,642
Non-interest income 23,775 33,793 22,236 21,930 25,813 23,369 12,036 19,718 101,734 80,938 58,998
Non-interest expenses 71,164 65,561 63,506 66,459 58,740 59,592 59,582 53,984 266,690 231,901 220,179
Income before income tax expense 78,470 62,716 29,766 5,006 34,977 35,086 11,787 20,271 175,958 102,120 91,054
Provision for income taxes 22,225 12,201 7,048 1,906 7,451 8,020 2,491 4,831 43,380 22,793 19,359
Net income 56,245 50,515 22,718 3,100 27,526 27,066 9,296 15,440 132,578 79,327 71,695
Preferred stock dividends 3,414 3,430 3,581 3,615 3,615 3,615 3,615 3,615 14,041 14,459 14,459
Net income available to common shareholders $ 52,831 $ 47,085 $ 19,137 $ (515) $ 23,911 $ 23,451 $ 5,681 $ 11,825 $ 118,537 $ 64,868 $ 57,236
Earnings per common share:                      
Basic earnings per share (usd per share) $ 1.67 $ 1.49 $ 0.61 $ (0.02) $ 0.76 $ 0.75 $ 0.18 $ 0.38 $ 3.76 $ 2.08 $ 1.81
Diluted earnings per share (usd per share) $ 1.65 $ 1.48 $ 0.61 $ (0.02) $ 0.75 $ 0.74 $ 0.18 $ 0.38 $ 3.74 $ 2.05 $ 1.78
Loss upon acquisition of interest-only GNMA securities             $ 7,500   $ 0 $ 7,476 $ 0