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GOODWILL (Tables)
 6 Months Ended
Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the three and six months ended June 30, 2023 and June 30, 2022 were as follows:
Three months endedSix months ended
June 30,June 30,
(Dollars in thousands)2023202220232022
Balance at beginning of period$1,005,738 $999,959 $1,001,507 $1,000,749 
Goodwill resulting from business combinations90 0 4,321 (790)
Balance at end of period$1,005,828 $999,959 $1,005,828 $999,959 
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
(Dollars in thousands)June 30, 2023December 31, 2022
Gross
carrying
amount		Accumulated
amortization		Gross
carrying
amount		Accumulated
amortization
Core deposit intangibles$41,750 $(27,941)$41,750 $(26,488)
Customer list69,563 (17,506)69,563 (14,457)
Other10,960 (4,668)14,079 (7,064)
Mortgage servicing rights22,230 (5,726)21,347 (4,811)
Total$144,503 $(55,841)$146,739 $(52,820)