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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

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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