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SHORT-TERM BORROWINGS AND LONG-TERM DEBT	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	10. SHORT-TERM BORROWINGS AND LONG-TERM DEBT The bank is a member of the Federal Home Loan Bank of Des Moines (the "FHLB") and maintained a $1.59 billion line of credit as of March 31, 2018, compared to $1.50 billion at December 31, 2017. At March 31, 2018, $1.53 billion was undrawn under this arrangement, compared to $1.47 billion at December 31, 2017. Short-term borrowings under this arrangement totaled $56.0 million at March 31, 2018, compared to $32.0 million at December 31, 2017.  There were no long-term borrowings under this arrangement at March 31, 2018 and December 31, 2017. FHLB advances available at March 31, 2018 were secured by certain real estate loans with a carrying value of $2.14 billion in accordance with the collateral provisions of the Advances, Security and Deposit Agreement with the FHLB. At March 31, 2018 and December 31, 2017, our bank had additional unused borrowings available at the Federal Reserve discount window of $72.3 million and $73.0 million, respectively. As of March 31, 2018 and December 31, 2017, certain commercial and commercial real estate loans with a carrying value totaling $127.1 million and $129.2 million, respectively, were pledged as collateral on our line of credit with the Federal Reserve discount window. The Federal Reserve does not have the right to sell or repledge these loans.

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- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

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