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Parent Company Only Financial Information - Condensed Statements of Income (Details) - USD ($) $ 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
Interest income |  |  |  |  |  |  |  |  | $ 25,535 | $ 23,022 | $ 24,489
Interest expense | $ (29,000) | $ (30,440) | $ (29,566) | $ (28,010) | $ (26,797) | $ (23,965) | $ (20,653) | $ (18,177) | (117,016) | (89,592) | (61,478)
Net loss from fair value adjustments |  |  |  |  |  |  |  |  | (5,353) | (4,122) | (3,465)
Other operating expenses |  |  |  |  |  |  |  |  | (14,937) | (15,235) | (15,239)
Income tax benefit | 3,957 | 2,536 | 3,272 | 2,287 | 1,046 | 1,910 | 4,489 | 2,950 | 12,052 | 10,395 | 25,013
Net income | $ 12,931 | $ 10,724 | $ 10,556 | $ 7,068 | $ 12,422 | $ 17,333 | $ 13,923 | $ 11,412 | 41,279 | 55,090 | 41,121
Other comprehensive gain (loss), net of tax |  |  |  |  |  |  |  |  | 2,945 | (2,472) | (624)
Comprehensive net income |  |  |  |  |  |  |  |  | 44,224 | 52,618 | 40,497
Holding Company [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends from the Bank |  |  |  |  |  |  |  |  | 32,000 | 34,000 | 21,500
Interest income |  |  |  |  |  |  |  |  | 250 | 275 | 505
Interest expense |  |  |  |  |  |  |  |  | (6,677) | (6,479) | (5,860)
Net loss from fair value adjustments |  |  |  |  |  |  |  |  | (2,725) | (4,769) | (2,903)
Other operating expenses |  |  |  |  |  |  |  |  | (2,833) | (1,391) | (1,354)
Income before taxes and equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 20,015 | 21,636 | 11,888
Income tax benefit |  |  |  |  |  |  |  |  | (3,173) | (3,907) | (6,926)
Income before equity in undistributed earnings of subsidiary |  |  |  |  |  |  |  |  | 23,188 | 25,543 | 18,814
Equity in undistributed earnings of the Bank |  |  |  |  |  |  |  |  | 18,091 | 29,547 | 22,307
Net income |  |  |  |  |  |  |  |  | 41,279 | 55,090 | 41,121
Other comprehensive gain (loss), net of tax |  |  |  |  |  |  |  |  | 2,945 | (2,472) | (624)
Comprehensive net income |  |  |  |  |  |  |  |  | $ 44,224 | $ 52,618 | $ 40,497

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