FAIR VALUE - CARRYING AMOUNTS AND FV OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets:
Available-for-sale debt securities	$ 629,947		$ 495,126
Held-to-maturity debt securities	32,621		44,764
Equity securities with readily determinable fair value	175		2,620
Mortgage loans held for sale, at fair value	2,912	$ 8,491	29,393	$ 25,791	$ 32,401	$ 46,867
Consumer loans held for sale, at fair value	8,796	17,459	19,747	10,779	13,020	3,298
Consumer loans held for sale, at the lower of cost or fair value	12,679	$ 13,777	2,937	$ 3,976	$ 11,412	$ 1,478
Carrying Value
Assets:
Cash and cash equivalents	754,393		756,971
Available-for-sale debt securities	629,947		495,126
Held-to-maturity debt securities	32,628		44,299
Equity securities with readily determinable fair value	175		2,620
Mortgage loans held for sale, at fair value	2,912		29,393
Consumer loans held for sale, at fair value	8,796		19,747
Consumer loans held for sale, at the lower of cost or fair value	12,679		2,937
Loans, net	4,224,531		4,431,985
Federal Home Loan Bank stock	8,568		10,311
Accrued interest receivable	11,102		9,877
Mortgage servicing rights	9,177		9,196
Rate lock loan commitments	175		1,404
Mandatory forward contracts	639		66
Interest rate swap agreements	7,121		5,786
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	209,376		290,967
Federal Home Loan Bank advances	20,000		25,000
Accrued interest payable	193		159
Interest rate swap agreements	7,121		5,786
Carrying Value | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	2,014,123		1,990,781
Carrying Value | Transaction deposits
Liabilities:
Deposit liabilities, fair value	2,540,961		2,553,423
Carrying Value | Time deposits
Liabilities:
Deposit liabilities, fair value	245,424		296,214
Total Fair Value
Assets:
Cash and cash equivalents	754,393		756,971
Available-for-sale debt securities	629,947		495,126
Held-to-maturity debt securities	32,621		44,764
Equity securities with readily determinable fair value	175		2,620
Mortgage loans held for sale, at fair value	2,912		29,393
Consumer loans held for sale, at fair value	8,796		19,747
Consumer loans held for sale, at the lower of cost or fair value	12,679		2,937
Loans, net	4,048,246		4,445,244
Accrued interest receivable	11,102		9,877
Mortgage servicing rights	17,592		11,540
Rate lock loan commitments	175		1,404
Mandatory forward contracts	639		66
Interest rate swap agreements	7,121		5,786
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	209,376		290,967
Federal Home Loan Bank advances	21,671		25,000
Accrued interest payable	193		159
Interest rate swap agreements	7,121		5,786
Total Fair Value | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	2,014,123		1,990,781
Total Fair Value | Transaction deposits
Liabilities:
Deposit liabilities, fair value	2,540,961		2,553,423
Total Fair Value | Time deposits
Liabilities:
Deposit liabilities, fair value	239,058		298,236
Total Fair Value | Fair Value, Inputs, Level 1
Assets:
Cash and cash equivalents	754,393		756,971
Available-for-sale debt securities	203,013		70,112
Equity securities with readily determinable fair value			2,450
Total Fair Value | Fair Value, Inputs, Level 2
Assets:
Available-for-sale debt securities	420,740		418,436
Held-to-maturity debt securities	32,621		44,764
Equity securities with readily determinable fair value	175		170
Mortgage loans held for sale, at fair value	2,912		29,393
Accrued interest receivable	11,102		9,877
Mortgage servicing rights	17,592		11,540
Rate lock loan commitments	175		1,404
Mandatory forward contracts	639		66
Interest rate swap agreements	7,121		5,786
Liabilities:
Securities sold under agreements to repurchase and other short-term borrowings	209,376		290,967
Federal Home Loan Bank advances	21,671		25,000
Accrued interest payable	193		159
Interest rate swap agreements	7,121		5,786
Total Fair Value | Fair Value, Inputs, Level 2 | Non Interest Bearing Deposits
Liabilities:
Deposit liabilities, fair value	2,014,123		1,990,781
Total Fair Value | Fair Value, Inputs, Level 2 | Transaction deposits
Liabilities:
Deposit liabilities, fair value	2,540,961		2,553,423
Total Fair Value | Fair Value, Inputs, Level 2 | Time deposits
Liabilities:
Deposit liabilities, fair value	239,058		298,236
Total Fair Value | Fair Value, Inputs, Level 3
Assets:
Available-for-sale debt securities	6,194		6,578
Consumer loans held for sale, at fair value	8,796		19,747
Consumer loans held for sale, at the lower of cost or fair value	12,679		2,937
Loans, net	$ 4,048,246		$ 4,445,244