LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - RECORDED INVESTMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Aging or recorded investments in loans
Recorded investment	$ 4,433,151	$ 4,148,227
Residential Real Estate - Owner Occupied
Aging or recorded investments in loans
Recorded investment	949,568	1,001,832
Residential Real Estate - Owner Occupied | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	937,348	990,650
Residential Real Estate - Owner Occupied | Nonperforming Financing Receivable
Aging or recorded investments in loans
Recorded investment	12,220	11,182
Residential Real Estate - Non Owner Occupied
Aging or recorded investments in loans
Recorded investment	258,803	242,846
Residential Real Estate - Non Owner Occupied | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	258,180	242,177
Residential Real Estate - Non Owner Occupied | Nonperforming Financing Receivable
Aging or recorded investments in loans
Recorded investment	623	669
Home equity lines of credit
Aging or recorded investments in loans
Recorded investment	293,186	332,548
Home equity lines of credit | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	291,321	331,453
Home equity lines of credit | Nonperforming Financing Receivable
Aging or recorded investments in loans
Recorded investment	1,865	1,095
Consumer: Credit cards
Aging or recorded investments in loans
Recorded investment	17,836	19,095
Consumer: Credit cards | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	17,836	19,095
Consumer: Overdrafts
Aging or recorded investments in loans
Recorded investment	1,522	1,102
Consumer: Overdrafts | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	1,522	1,102
Consumer: Automobile loan
Aging or recorded investments in loans
Recorded investment	52,923	63,475
Consumer: Automobile loan | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	52,744	63,400
Consumer: Automobile loan | Nonperforming Financing Receivable
Aging or recorded investments in loans
Recorded investment	179	75
Other consumer
Aging or recorded investments in loans
Recorded investment	68,115	46,642
Other consumer | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	68,102	46,605
Other consumer | Nonperforming Financing Receivable
Aging or recorded investments in loans
Recorded investment	13	37
Republic Credit Solutions
Aging or recorded investments in loans
Recorded investment	105,397	88,744
Republic Credit Solutions | Performing Financing Receivable
Aging or recorded investments in loans
Recorded investment	105,293	88,616
Republic Credit Solutions | Nonperforming Financing Receivable
Aging or recorded investments in loans
Recorded investment	$ 104	$ 128