Note 3 - Cash, Cash Equivalents and Restricted Cash	12 Months Ended
Dec. 31, 2022
Notes to Financial Statements
Cash and Cash Equivalents Disclosure [Text Block]	3. Cash, Cash Equivalents and Restricted Cash The Company manages its cash and cash equivalents based upon the Company’s operating, investment, and financing activities. Cash and cash equivalents, for the purpose of reporting cash flows, consist of cash and due from banks and short-term investments and interest-bearing deposits. Cash and due from banks include cash on hand, cash items in transit, cash due from the Federal Reserve Bank of San Francisco (“FRBSF”) and other financial institutions. Short-term investments and interest-bearing deposits include cash placed with other banks with original maturity of three months or less. The Company had average excess balance with FRBSF of $1.24 billion and $1.61 billion as of December 31, 2022 and 2021, respectively. At December 31, 2022 the Company has $88.9 million as cash margin that serves as collateral for interest rate swaps of which $8.2 million is restricted. As of December 31, 2021, the Company had $24.3 million on deposit in a cash margin account that serves as collateral for interest rate swaps. These amounts included zero and $5.9 million as of December 31, 2022 and December 31, 2021, respectively, on deposit in a cash margin account that serves as collateral for the Bancorp’s interest rate swaps. As of December 31, 2022 and December 31, 2021, the Company held $25.4 million and $690 thousand, respectively, in a restricted escrow account with a major bank for its alternative energy investments.

Note 3 - Cash, Cash Equivalents and Restricted Cash

12 Months Ended

Dec. 31, 2022

Cash and Cash Equivalents Disclosure [Text Block]

3. Cash, Cash Equivalents and Restricted Cash

The Company manages its cash and cash equivalents based upon the Company’s operating, investment, and financing activities. Cash and cash equivalents, for the purpose of reporting cash flows, consist of cash and due from banks and short-term investments and interest-bearing deposits. Cash and due from banks include cash on hand, cash items in transit, cash due from the Federal Reserve Bank of San Francisco (“FRBSF”) and other financial institutions. Short-term investments and interest-bearing deposits include cash placed with other banks with original maturity of three months or less.

The Company had average excess balance with FRBSF of $1.24 billion and $1.61 billion as of December 31, 2022 and 2021, respectively. At December 31, 2022 the Company has $88.9 million as cash margin that serves as collateral for interest rate swaps of which $8.2 million is restricted. As of December 31, 2021, the Company had $24.3 million on deposit in a cash margin account that serves as collateral for interest rate swaps. These amounts included zero and $5.9 million as of December 31, 2022 and December 31, 2021, respectively, on deposit in a cash margin account that serves as collateral for the Bancorp’s interest rate swaps. As of December 31, 2022 and December 31, 2021, the Company held $25.4 million and $690 thousand, respectively, in a restricted escrow account with a major bank for its alternative energy investments.