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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Total interest income $ 55,053 $ 57,969 $ 53,959 $ 51,781 $ 53,901 $ 51,753 $ 52,950 $ 53,814 $ 218,762 $ 212,418 $ 216,383
Total interest expense 1,957 1,883 1,898 1,977 2,427 2,633 3,691 5,984 7,715 14,735 32,309
Net interest income 53,096 56,086 52,061 49,804 51,474 49,120 49,259 47,830 211,047 197,683 184,074
Provision (credit) for loan and lease losses (7,692) (2,635) (3,443) (821) 4,898 14,873 11,213 11,127 (14,591) 42,111 6,346
Net interest income after provision for credit losses 60,788 58,721 55,504 50,625 46,576 34,247 38,046 36,703 225,638 155,572 177,728
Other operating income 11,566 10,253 10,530 10,711 14,057 11,563 10,692 8,886 43,060 45,198 41,801
Other operating expense 42,422 41,345 41,433 37,846 44,690 36,751 35,854 34,442 163,046 151,737 141,602
Income before income taxes 29,932 27,629 24,601 23,490 15,943 9,059 12,884 11,147 105,652 49,033 77,927
Income tax expense 7,605 6,814 5,887 5,452 3,772 2,200 2,967 2,821 25,758 11,760 19,605
Net income $ 22,327 $ 20,815 $ 18,714 $ 18,038 $ 12,171 $ 6,859 $ 9,917 $ 8,326 $ 79,894 $ 37,273 $ 58,322
Basic earnings per share (in dollars per share) $ 0.80 $ 0.74 $ 0.66 $ 0.64 $ 0.43 $ 0.24 $ 0.35 $ 0.30 $ 2.85 $ 1.33 $ 2.05
Diluted earnings per share (in dollars per share) 0.80 0.74 0.66 0.64 0.43 0.24 0.35 0.29 2.83 1.32 2.03
Cash dividends declared (in dollars per share) $ 0.25 $ 0.24 $ 0.24 $ 0.23 $ 0.23 $ 0.23 $ 0.23 $ 0.23 $ 0.96 $ 0.92 $ 0.90
Return on average assets (ROA) 1.22% 1.15% 1.06% 1.07% 0.74% 0.42% 0.61% 0.55% 1.13% 0.58%  
Return on average equity (ROE) 16.05% 14.82% 13.56% 13.07% 8.87% 4.99% 7.34% 6.21% 14.38% 6.85%  
Efficiency ratio 65.61% 62.32% 66.20% 62.54% 68.20% 60.56% 59.81% 60.73% 64.16% 62.47%  
Net interest margin (NIM) 3.08% 3.31% 3.16% 3.19% 3.32% 3.19% 3.26% 3.43% 3.18% 3.30%