GOODWILL, CORE DEPOSIT INTANGIBLES AND OTHER INTANGIBLE ASSETS (Carrying Amount of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 123,116	$ 122,206
Accumulated Amortization	90,122	82,328
Net Carrying Amount	32,994	39,878
Core Deposit Intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,185	101,185
Accumulated Amortization	76,031	68,330
Net Carrying Amount	25,154	32,855
Customer Relationship Intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,177	1,177
Accumulated Amortization	1,177	1,044
Net Carrying Amount	0	133
Mortgage Servicing Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,700	12,790
Accumulated Amortization	5,860	6,378
Net Carrying Amount	7,840	6,412
Commercial Servicing Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,054	7,054
Accumulated Amortization	7,054	6,576
Net Carrying Amount	$ 0	$ 478