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BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 30,000
Commitments outstanding to extend credit	0	$ 0
Short-term Debt	$ 1,316,181	$ 1,040,691	$ 814,565
Short-term debt interest rate	1.62%	2.33%	1.32%
Short-term debt, average for the year	$ 1,146,719	$ 947,427	$ 830,365
Short-term debt, average rate (as a percent)	1.90%	1.90%	0.98%
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 165,181	$ 183,591	$ 72,265
Short-term debt interest rate	0.85%	1.65%	0.19%
Short-term debt, average for the year	$ 155,859	$ 87,221	$ 69,766
Short-term debt, average rate (as a percent)	1.15%	0.58%	0.19%
Short-term debt, maximum month-end balances	$ 260,621	$ 183,591	$ 130,633
Federal Home Loan Bank Borrowings [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 1,151,000	$ 857,100	$ 742,300
Short-term debt interest rate	1.73%	2.48%	1.43%
Short-term debt, average for the year	$ 990,860	$ 857,028	$ 760,558
Short-term debt, average rate (as a percent)	2.37%	2.03%	1.05%
Short-term debt, maximum month-end balances	$ 1,171,400	$ 1,170,800	$ 957,700
Short-term Debt
Short-term Debt [Line Items]
Short-term debt, average for the year	$ 0	$ 3,178	$ 41
Short-term debt, average rate (as a percent)	0.00%	4.36%	4.07%
Short-term debt, maximum month-end balances	$ 0	$ 10,000	$ 0

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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