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Compensation Plans - Reclassifications Out of AOCI (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income | $ 14,418 | $ 13,564 | $ 11,964 | $ 9,230 | $ 10,702 | $ 8,410 | $ 9,693 | $ 9,542 | $ 49,176 | $ 38,347 | $ 34,394
Net interest income | 61,613 | 63,046 | 61,715 | 52,343 | 50,593 | 48,093 | 47,048 | 46,171 | 238,717 | 191,905 | 177,304
Income before income tax expense | 36,336 | 36,538 | 22,903 | 20,259 | 28,428 | 24,318 | 27,132 | 24,699 | 116,036 | 104,577 | 86,517
Income tax expense | 7,246 | 7,469 | 4,479 | 4,103 | 4,899 | 1,802 | 4,881 | 3,778 | 23,297 | 15,360 | 38,327
Net income | $ 29,090 | $ 29,069 | $ 18,424 | $ 16,156 | $ 23,529 | $ 22,516 | $ 22,251 | $ 20,921 | 92,739 | 89,217 | 48,190
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income tax expense |  |  |  |  |  |  |  |  | (182) | 9 | 22
Income tax expense |  |  |  |  |  |  |  |  | 45 | (2) | (9)
Net income |  |  |  |  |  |  |  |  | (137) | 7 | 13
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Noninterest income |  |  |  |  |  |  |  |  | (49) | 9 | 22
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | $ (133) | $ 0 | $ 0

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