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Parent Company Only Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Net income | $ 3,461 | $ 14,331 | $ 18,272 | $ (1,390) | $ 12,931 | $ 10,724 | $ 10,556 | $ 7,068 | $ 34,674 | $ 41,279 | $ 55,090
Deferred income tax |  |  |  |  |  |  |  |  | (4,637) | (3,895) | (2,664)
Fair value adjustments for financial assets and financial liabilities |  |  |  |  |  |  |  |  | 2,142 | 5,353 | 4,122
Stock-based compensation expense |  |  |  |  |  |  |  |  | 6,450 | 7,763 | 7,016
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 71,278 | 63,770 | 77,303
Cash used in acquisition of Empire |  |  |  |  |  |  |  |  | (54,836) | 0 | 0
Cash provided by acquisition of Empire |  |  |  |  |  |  |  |  | 86,340 | 0 | 0
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | 93,098 | (194,769) | (477,995)
Purchase of treasury stock |  |  |  |  |  |  |  |  | (3,877) | (2,656) | (22,585)
Stock options exercised |  |  |  |  |  |  |  |  |  | 3 | 6
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (56,775) | 62,225 | 467,707
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 107,601 | (68,774) | 67,015
Cash and cash equivalents, beginning of year |  |  |  | 49,787 |  |  |  | 118,561 | 49,787 | 118,561 | 51,546
Cash and cash equivalents, end of year | 157,388 |  |  |  | 49,787 |  |  |  | 157,388 | 49,787 | 118,561
Holding Company |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 34,674 | 41,279 | 55,090
Equity in undistributed earnings of the Bank |  |  |  |  |  |  |  |  | 36,981 | (18,091) | (29,547)
Deferred income tax |  |  |  |  |  |  |  |  | (291) | (769) | (1,915)
Fair value adjustments for financial assets and financial liabilities |  |  |  |  |  |  |  |  | 85 | 2,725 | 4,769
Stock-based compensation expense |  |  |  |  |  |  |  |  | 6,450 | 7,763 | 7,016
Net change in operating assets and liabilities |  |  |  |  |  |  |  |  | 3,490 | 3,945 | 4,246
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 81,389 | 36,852 | 39,659
Cash used in acquisition of Empire |  |  |  |  |  |  |  |  | (54,836) |  |
Cash provided by acquisition of Empire |  |  |  |  |  |  |  |  | 15,769 | 0 | 0
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (39,067) | 0 | 0
Purchase of treasury stock |  |  |  |  |  |  |  |  | (3,877) | (2,656) | (22,585)
Cash dividends paid |  |  |  |  |  |  |  |  | (24,813) | (24,149) | (22,927)
Stock options exercised |  |  |  |  |  |  |  |  | 0 | 3 | 6
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (28,690) | (26,802) | (45,506)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 13,632 | 10,050 | (5,847)
Cash and cash equivalents, beginning of year |  |  |  | $ 14,401 |  |  |  | $ 4,351 | 14,401 | 4,351 | 10,198
Cash and cash equivalents, end of year | $ 28,033 |  |  |  | $ 14,401 |  |  |  | $ 28,033 | $ 14,401 | $ 4,351

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