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BUSINESS SEGMENTS - Schedule of Income and Total Assets for Reportable Segments (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
Net interest income | $ 31,735 | $ 32,149 | $ 31,971 | $ 31,747 | $ 30,914 | $ 30,085 | $ 29,268 | $ 30,007 | $ 127,602 | $ 120,274 | $ 115,163
Noninterest income |  |  |  |  |  |  |  |  | 61,760 | 54,696 | 44,193
Total income |  |  |  |  |  |  |  |  | 189,362 | 174,970 | 159,356
Provision for loan losses | 2,350 | 5,150 | 4,900 | 20,000 | 1,950 | 800 | 1,150 | 100 | 32,400 | 4,000 | 3,550
Compensation and benefits |  |  |  |  |  |  |  |  | 77,516 | 70,129 | 62,802
Premises and equipment expense |  |  |  |  |  |  |  |  | 16,377 | 14,735 | 13,497
FDIC expense |  |  |  |  |  |  |  |  | 1,975 | 277 | 2,443
Other noninterest expense |  |  |  |  |  |  |  |  | 29,091 | 19,707 | 19,344
Total noninterest expense |  |  |  |  |  |  |  |  | 157,359 | 108,848 | 101,636
Income before income tax expense | 4,542 | 18,749 | 10,683 | (1,971) | 17,788 | 17,442 | 14,971 | 15,921 | 32,003 | 66,122 | 57,720
Income tax expense | 1,512 | 5,202 | 2,441 | (3,344) | 5,555 | 5,216 | 3,421 | 4,496 | 5,811 | 18,688 | 13,550
Net income | 3,030 | $ 13,547 | $ 8,242 | $ 1,373 | 12,233 | $ 12,226 | $ 11,550 | $ 11,425 | 26,192 | 47,434 | 44,170
Total assets at period end | 5,890,442 |  |  |  | 5,182,879 |  |  |  | 5,890,442 | 5,182,879 | 4,617,858
Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 121,583 | 114,983 | 110,001
Noninterest income |  |  |  |  |  |  |  |  | 19,104 | 14,999 | 10,013
Total income |  |  |  |  |  |  |  |  | 140,687 | 129,982 | 120,014
Provision for loan losses |  |  |  |  |  |  |  |  | 32,400 | 4,000 | 3,550
Compensation and benefits |  |  |  |  |  |  |  |  | 54,044 | 48,925 | 44,875
Premises and equipment expense |  |  |  |  |  |  |  |  | 14,056 | 12,533 | 11,747
FDIC expense |  |  |  |  |  |  |  |  | 1,975 | 277 | 2,443
Other noninterest expense |  |  |  |  |  |  |  |  | 19,694 | 10,932 | 11,313
Total noninterest expense |  |  |  |  |  |  |  |  | 122,169 | 76,667 | 73,928
Income before income tax expense |  |  |  |  |  |  |  |  | 18,518 | 53,315 | 46,086
Income tax expense |  |  |  |  |  |  |  |  | 2,170 | 15,069 | 10,819
Net income |  |  |  |  |  |  |  |  | 16,348 | 38,246 | 35,267
Total assets at period end | 5,798,770 |  |  |  | 5,095,744 |  |  |  | 5,798,770 | 5,095,744 | 4,547,179
Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 6,019 | 5,291 | 5,162
Noninterest income |  |  |  |  |  |  |  |  | 42,656 | 39,697 | 34,180
Total income |  |  |  |  |  |  |  |  | 48,675 | 44,988 | 39,342
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Compensation and benefits |  |  |  |  |  |  |  |  | 23,472 | 21,204 | 17,927
Premises and equipment expense |  |  |  |  |  |  |  |  | 2,321 | 2,202 | 1,750
FDIC expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other noninterest expense |  |  |  |  |  |  |  |  | 9,397 | 8,775 | 8,031
Total noninterest expense |  |  |  |  |  |  |  |  | 35,190 | 32,181 | 27,708
Income before income tax expense |  |  |  |  |  |  |  |  | 13,485 | 12,807 | 11,634
Income tax expense |  |  |  |  |  |  |  |  | 3,641 | 3,619 | 2,731
Net income |  |  |  |  |  |  |  |  | 9,844 | 9,188 | 8,903
Total assets at period end | $ 91,672 |  |  |  | $ 87,135 |  |  |  | $ 91,672 | $ 87,135 | $ 70,679

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