OPERATING SEGMENTS AND RELATED INFORMATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Operating Segments and Related Information
Number of reportable segments | segment	3
Number of operating segments | segment	3
Goodwill	$ 317,873	$ 317,873
Total Assets	12,336,677	12,859,689
Net interest income	323,438	270,698	$ 282,935
Noninterest income	126,803	132,804	118,265
Noninterest expense	283,881	261,780	234,197
Income before income taxes	161,737	156,823	128,206
Net income	128,311	123,449	100,344
Banking
Operating Segments and Related Information
Goodwill	294,773	294,773
FirsTech
Operating Segments and Related Information
Goodwill	8,992	8,992
Wealth Management
Operating Segments and Related Information
Goodwill	14,108	14,108
Operating segment | Banking
Operating Segments and Related Information
Goodwill	294,773	294,773
Total Assets	12,199,960	12,746,833
Net interest income	340,083	285,678	294,728
Noninterest income	54,154	59,393	61,043
Noninterest expense	221,997	205,905	185,445
Income before income taxes	167,617	154,267	131,529
Net income	131,596	117,844	101,226
Operating segment | FirsTech
Operating Segments and Related Information
Goodwill	8,992	8,992
Total Assets	48,715	47,481
Net interest income	65	79	79
Noninterest income	21,720	19,629	16,548
Noninterest expense	20,619	17,574	13,279
Income before income taxes	1,166	2,134	3,348
Net income	847	1,527	2,372
Operating segment | Wealth Management
Operating Segments and Related Information
Goodwill	14,108	14,108
Total Assets	84,082	65,587
Net interest income	0	0	0
Noninterest income	55,394	53,082	43,429
Noninterest expense	31,545	29,198	26,086
Income before income taxes	23,849	23,884	17,343
Net income	18,543	18,570	13,181
Intersegment Eliminations
Operating Segments and Related Information
Goodwill	0	0
Total Assets	3,920	(212)
Net interest income	(16,710)	(15,059)	(11,872)
Noninterest income	(4,465)	700	(2,755)
Noninterest expense	9,720	9,103	9,387
Income before income taxes	(30,895)	(23,462)	(24,014)
Net income	$ (22,675)	$ (14,492)	$ (16,435)