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FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial Assets
Securities available for sale	$ 604,529	$ 663,230
Financial Liabilities
FRB PPPLF	71,720	348,118
Level 1
Financial Assets
Cash and cash equivalents	215,657	56,910
Securities available for sale	0
FHLB stock	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
Deposits	0
Level 1 | Bank Time Deposits [Member]
Financial Liabilities
Deposits	0
Level 1 | Federal Reserve Bank Advances
Financial Liabilities
FRB PPPLF	0
Level 1 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	0
Level 2
Financial Assets
Cash and cash equivalents	0
Securities available for sale	604,529	663,230
FHLB stock	13,975	20,679
Net loans	0
Accrued interest receivable	3,171	3,294
Cash surrender value of bank-owned life insurance policies	77,388	75,863
Derivative assets	31,481	6,791
Financial Liabilities
Short-term other borrowings		44,831
Securities sold under agreements to repurchase	30,048
FHLB advances	229,413	425,989
Derivative liabilities	34,871	8,102
Level 2 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Deposits	2,037,099	1,751,481
Level 2 | Bank Time Deposits [Member]
Financial Liabilities
Deposits	805,783	932,886
Level 2 | Federal Reserve Bank Advances
Financial Liabilities
FRB PPPLF	131,141
Level 2 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	59,920	59,920
Level 3
Financial Assets
Cash and cash equivalents	0
Securities available for sale	0
FHLB stock	0
Net loans	2,672,882	2,634,147
Accrued interest receivable	0
Cash surrender value of bank-owned life insurance policies	0
Derivative assets	24	59
Financial Liabilities
Securities sold under agreements to repurchase	0
FHLB advances	0
Derivative liabilities	87	84
Level 3 | Bank Non-maturity Deposits [Member]
Financial Liabilities
Deposits	0
Level 3 | Bank Time Deposits [Member]
Financial Liabilities
Deposits	0
Level 3 | Federal Reserve Bank Advances
Financial Liabilities
FRB PPPLF	0
Level 3 | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	0
Carrying Amount
Financial Assets
Cash and cash equivalents	215,657	56,910
Securities available for sale	604,529	663,230
FHLB stock	13,975	20,679
Net loans	2,690,784	2,625,739
Accrued interest receivable	3,171	3,294
Cash surrender value of bank-owned life insurance policies	77,388	75,863
Derivative assets	31,505	6,850
Financial Liabilities
Short-term other borrowings		44,832
Securities sold under agreements to repurchase	30,048
FHLB advances	224,282	426,564
Derivative liabilities	34,958	8,186
Carrying Amount | Bank Non-maturity Deposits [Member]
Financial Liabilities
Deposits	2,121,406	1,763,116
Carrying Amount | Bank Time Deposits [Member]
Financial Liabilities
Deposits	813,509	932,635
Carrying Amount | Federal Reserve Bank Advances
Financial Liabilities
FRB PPPLF	131,236
Carrying Amount | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	59,920	59,920
Total Fair Value
Financial Assets
Cash and cash equivalents	215,657	56,910
Securities available for sale	604,529	663,230
FHLB stock	13,975	20,679
Net loans	2,672,882	2,634,147
Accrued interest receivable	3,171	3,294
Cash surrender value of bank-owned life insurance policies	77,388	75,863
Derivative assets	31,505	6,850
Financial Liabilities
Short-term other borrowings		44,831
Securities sold under agreements to repurchase	30,048
FHLB advances	229,413	425,989
Derivative liabilities	34,958	8,186
Total Fair Value | Bank Non-maturity Deposits [Member]
Financial Liabilities
Deposits	2,037,099	1,751,481
Total Fair Value | Bank Time Deposits [Member]
Financial Liabilities
Deposits	805,783	932,886
Total Fair Value | Federal Reserve Bank Advances
Financial Liabilities
FRB PPPLF	131,141
Total Fair Value | Subordinated borrowings
Financial Liabilities
Subordinated borrowings	$ 59,920	$ 59,920

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