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FEDERAL HOME LOAN BANK AND FEDERAL RESERVE BANK ADVANCES AND OTHER BORROWINGS - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 179,725,000		$ 179,400,000
Line of Credit | Federal Reserve Bank Paycheck Protection Program Liquidity Facility
Debt Instrument [Line Items]
Remaining borrowing capacity	118,931,000
Outstanding balances of debt instrument	0		$ 0
Maximum month-end outstanding amount	$ 0	$ 25,136,000

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum month-end amount borrowed under the credit facility during the period.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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