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Borrowing Arrangements
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Borrowing Arrangements Borrowing arrangements
As of December 31, 2021, the Company had no borrowings from the FHLB of San Francisco, compared with $5.0 million as of December 31, 2020, which had a zero interest rate under the Recovery Advance Program to support pandemic relief. The Company has a letter of credit with the FHLB in the amount of $67.0 million to secure a public deposit as of both December 31, 2021 and 2020.

The Company had available borrowings from the following institutions as of December 31, 2021:
($ in thousands)December 31, 2021
Federal Home Loan Bank—San Francisco$350,585 
Federal Reserve Bank141,639 
Pacific Coast Bankers Bank50,000 
Zions Bank25,000 
First Horizon Bank25,000 
Total$592,224 
The Company has pledged approximately $958.3 million and $909.2 million of loans as collateral for these lines of credit as of December 31, 2021 and 2020, respectively.