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FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Assets
Securities available for sale	$ 626,403	$ 585,046
Level 1
Financial Assets
Cash and cash equivalents	223,512	226,007
Securities available for sale	0
FHLB stock	0
Loans held for sale	0
Net loans	0
Accrued interest receivable	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	0
Financial Liabilities
Securities sold under agreements to repurchase	0
FHLB advances	0
Derivative liabilities	0
Level 1 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 1 | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 1 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	0
Level 2
Financial Assets
Cash and cash equivalents	0
Securities available for sale	626,403	585,046
FHLB stock	14,826	14,036
Loans held for sale	0
Net loans	0
Accrued interest receivable	3,668	2,964
Cash surrender value of bank-owned life insurance policies	78,388	77,870
Derivative assets	15,426	28,684
Financial Liabilities
Short-term other borrowings		27,779
Securities sold under agreements to repurchase	24,276
FHLB advances	271,622	252,698
Derivative liabilities	16,805	28,559
Level 2 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	2,274,973	2,122,222
Level 2 | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	636,670	694,700
Level 2 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	57,133	57,091
Level 3
Financial Assets
Cash and cash equivalents	0
Securities available for sale	0
FHLB stock	0
Loans held for sale	10,148	24,163
Net loans	2,518,606	2,547,970
Accrued interest receivable	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	46	22
Financial Liabilities
Securities sold under agreements to repurchase	0
FHLB advances	0
Derivative liabilities	85	95
Level 3 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 3 | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	0
Level 3 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	0
Carrying Amount
Financial Assets
Cash and cash equivalents	223,512	226,007
Securities available for sale	626,403	585,046
FHLB stock	14,826	14,036
Loans held for sale	10,148	23,988
Net loans	2,527,411	2,543,803
Accrued interest receivable	3,688	2,964
Cash surrender value of bank-owned life insurance policies	78,388	77,870
Derivative assets	15,472	28,706
Financial Liabilities
Short-term other borrowings		27,779
Securities sold under agreements to repurchase	24,276
FHLB advances	267,934	248,283
Derivative liabilities	16,890	28,654
Carrying Amount | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	2,273,906	2,207,854
Carrying Amount | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	638,436	698,361
Carrying Amount | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	60,003	59,961
Total Fair Value
Financial Assets
Cash and cash equivalents	223,512	226,007
Securities available for sale	626,403	585,046
FHLB stock	14,826	14,036
Loans held for sale	10,148	24,163
Net loans	2,518,606	2,547,970
Accrued interest receivable	3,668	2,964
Cash surrender value of bank-owned life insurance policies	78,388	77,870
Derivative assets	15,472	28,706
Financial Liabilities
Short-term other borrowings		27,779
Securities sold under agreements to repurchase	24,276
FHLB advances	271,622	252,698
Derivative liabilities	16,890	28,654
Total Fair Value | Bank Non-maturity Deposits [Member]
Financial Liabilities
Non-maturity deposits	2,274,973	2,122,222
Total Fair Value | Bank Time Deposits [Member]
Financial Liabilities
Non-maturity deposits	636,670	694,700
Total Fair Value | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	$ 57,133	$ 57,091

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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