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Condensed Financial Information (parent company only) - Statements of Income and Comprehensive Income (Details) - USD ($) $ 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
Income |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ 1,898 | $ 2,068 | $ 2,699
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense | $ 10,913 | $ 13,304 | $ 16,234 | $ 25,930 | $ 28,237 | $ 29,200 | $ 27,361 | $ 23,947 | 66,381 | 108,745 | 69,087
Salaries and employee benefits |  |  |  |  |  |  |  |  | 155,937 | 144,037 | 131,704
Other expenses |  |  |  |  |  |  |  |  | 18,001 | 17,804 | 16,966
Income before income tax expense | 52,776 | 41,831 | 37,615 | 37,753 | 56,128 | 43,094 | 48,805 | 45,758 |  |  |
Income tax benefit | (7,641) | (5,621) | (4,623) | (3,490) | (8,298) | (6,337) | (7,749) | (6,941) | (21,375) | (29,325) | (28,999)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  | 148,600 | 164,460 | 159,139
Net income | $ 45,135 | $ 36,210 | $ 32,992 | $ 34,263 | $ 47,830 | $ 36,757 | $ 41,056 | $ 38,817 | 148,600 | 164,460 | 159,139
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 46,962 | 49,296 | (17,888)
Comprehensive income |  |  |  |  |  |  |  |  | 195,562 | 213,756 | 141,251
Parent |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 70,100 | 125,775 | 100,954
Other income |  |  |  |  |  |  |  |  | (62) | 172 | 572
Total income |  |  |  |  |  |  |  |  | 70,038 | 125,947 | 101,526
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 6,777 | 8,309 | 8,233
Salaries and employee benefits |  |  |  |  |  |  |  |  | 3,426 | 3,540 | 3,729
Net occupancy and equipment expenses |  |  |  |  |  |  |  |  | 745 | 802 | 851
Other outside services |  |  |  |  |  |  |  |  | 731 | 1,889 | 489
Professional services |  |  |  |  |  |  |  |  | 218 | 303 | 270
Other expenses |  |  |  |  |  |  |  |  | 1,266 | 1,587 | 442
Total expenses |  |  |  |  |  |  |  |  | 13,163 | 16,430 | 14,014
Income before income tax expense |  |  |  |  |  |  |  |  | 56,875 | 109,517 | 87,512
Income tax benefit |  |  |  |  |  |  |  |  | 2,260 | 3,575 | 3,298
Income before equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 59,135 | 113,092 | 90,810
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 89,465 | 51,368 | 68,329
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  | 148,600 | 164,460 | 159,139
Net income |  |  |  |  |  |  |  |  | 148,600 | 164,460 | 159,139
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 46,962 | 49,296 | (17,888)
Comprehensive income |  |  |  |  |  |  |  |  | $ 195,562 | $ 213,756 | $ 141,251

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