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Federal Home Loan Bank Advances
12 Months Ended
Dec. 31, 2020
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]  
Federal Home Loan Bank Advances FEDERAL HOME LOAN BANK ADVANCES
FHLB advances are collateralized by 1-4 family residential real estate loans, business loans, and certain commercial real estate loans. At December 31, 2020 and 2019, the carrying value of the loans pledged to the FHLB of Des Moines was $1.4 billion and $1.6 billion, respectively. The secured line of credit had availability of approximately $739.1 million at December 31, 2020.

The following table summarizes the type, maturity, and rate of the Company’s FHLB advances at December 31:
20202019
($ in thousands)TermOutstanding BalanceWeighted RateOutstanding BalanceWeighted Rate
Non-amortizing fixed advanceLess than 1 year$— — %$170,000 1.73 %
Non-amortizing fixed advanceGreater than 1 year50,000 1.56 %52,406 1.62 %
Total FHLB advances$50,000 1.56 %$222,406 1.70 %

In August 2019, the Company entered into agreements totaling $50 million for convertible advances with a weighted average rate of 1.56% that mature in 2024 and are currently puttable by the FHLB.

At December 31, 2020, the Company used $6.0 million of collateral value to secure confirming letters of credit for public unit deposits and industrial development bonds.