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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 123,995 | $ 126,718 | $ 111,950 | $ 101,075 | $ 103,303 | $ 110,045 | $ 107,639 | $ 96,964 | $ 463,739 | $ 417,951 | $ 372,850
Interest expense | 46,402 | 50,983 | 47,271 | 41,771 | 41,779 | 46,044 | 40,317 | 31,933 | 186,429 | 160,074 | 105,507
Net interest income | 77,593 | 75,735 | 64,679 | 59,304 | 61,524 | 64,001 | 67,322 | 65,031 | 277,310 | 257,877 | 267,343
Provision for loan and lease losses | 9,689 | 4,426 | 5,346 | 4,767 | 1,385 | 2,924 | (784) | 2,117 | 24,227 | 5,642 | 6,768
Non-interest income | 25,813 | 23,369 | 12,036 | 19,718 | 19,877 | 2,084 | 16,127 | 20,910 | 80,938 | 58,998 | 78,910
Non-interest expenses | 58,740 | 59,592 | 59,582 | 53,984 | 57,045 | 57,104 | 53,750 | 52,280 | 231,901 | 220,179 | 215,606
Income before income tax expense | 34,977 | 35,086 | 11,787 | 20,271 | 22,971 | 6,057 | 30,483 | 31,544 | 102,120 | 91,054 | 123,879
Provision for income taxes | 7,451 | 8,020 | 2,491 | 4,831 | 5,109 | 28 | 6,820 | 7,402 | 22,793 | 19,359 | 45,042
Net income | 27,526 | 27,066 | 9,296 | 15,440 | 17,862 | 6,029 | 23,663 | 24,142 | 79,327 | 71,695 | 78,837
Preferred stock dividends | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 14,459 | 14,459 | 14,459
Net income available to common shareholders | $ 23,911 | $ 23,451 | $ 5,681 | $ 11,825 | $ 14,247 | $ 2,414 | $ 20,048 | $ 20,527 | $ 64,868 | $ 57,236 | $ 64,378
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share (usd per share) | $ 0.76 | $ 0.75 | $ 0.18 | $ 0.38 | $ 0.45 | $ 0.08 | $ 0.64 | $ 0.65 | $ 2.08 | $ 1.81 | $ 2.10
Diluted earnings per share (usd per share) | $ 0.75 | $ 0.74 | $ 0.18 | $ 0.38 | $ 0.44 | $ 0.07 | $ 0.62 | $ 0.64 | $ 2.05 | $ 1.78 | $ 1.97
Loss upon acquisition of interest-only GNMA securities |  |  | $ 7,500 |  |  |  |  |  | $ 7,476 | $ 0 | $ 0
Loss on sale of investment securities |  |  |  |  |  | $ (18,700) |  |  | $ 1,001 | $ (18,659) | $ 8,800

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