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Note 8 - Borrowed Funds (Details Textual) - USD ($) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 28, 2019 | Nov. 14, 2017 | Oct. 12, 2017 | Nov. 23, 2014 | Mar. 13, 2014 | Nov. 23, 2004 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Securities Sold under Agreements to Repurchase, Total |  |  |  |  |  |  | $ 0 | $ 0 |
Short-term Debt, Total |  |  |  |  |  |  | 25,683,000 | 0 |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | 670,000,000 | 530,000,000 |
Threshold for Deferred Bonus |  |  |  |  |  | $ 225,000 |  |  |
Amount of Deferred Bonus Accrued in Other Liabilities |  |  |  |  | $ 300,000 | $ 610,000 |  |  |
Accrued Interest on Deferred Bonus | 5.72% |  |  | 5.06% | 5.02% | 7.00% |  |  |
Interest Expense, Other |  |  |  |  |  |  | 99,000 | 92,000 | $ 87,000
Accrued Bonuses |  |  |  |  |  |  | 2,000,000.0 | 1,900,000 |
Junior Subordinated Notes, Noncurrent |  |  |  |  |  |  | $ 119,100,000 | $ 119,100,000 |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.09% | 4.96% |
Debt Instrument, Term |  |  |  |  |  |  | 30 years |  |
Interest Expense, Debt, Total |  |  |  |  |  |  | $ 5,600,000 | $ 5,200,000 | $ 4,100,000
SinoPac Bancorp [Member] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 100,000,000 |  |  |  |  |  |  |
Over-night Borrowings [Member] |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | $ 450,000,000.0 | $ 200,000,000.0 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  |  | 1.66% | 2.56% |
Non Overnight Borrowings [Member] |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | $ 220,000,000 | $ 330,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  |  | 2.26% | 2.42% |
Short-term debt Through Hong Kong Office [Member] |  |  |  |  |  |  |  |  |
Short-term Debt, Total |  |  |  |  |  |  | $ 25,700,000 |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  | 2.69% |  |
Mature in May 2021 [Member] |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | $ 75,000,000 |  |
Mature in June 2021 [Member] |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | 50,000,000 |  |
Mature in July 2021 [Member] |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | 75,000,000 |  |
Mature in May 2023 [Member] |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks, Total |  |  |  |  |  |  | 20,000,000 |  |
Business Combination, Deferred Payments [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |
Mature in July 2020 [Member] | SinoPac Bancorp [Member] |  |  |  |  |  |  |  |  |
Business Combination, Deferred Payments |  |  |  |  |  |  | $ 7,000,000.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.40% |  |
Term Loan [Member] | US Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 75,000,000.0 |  |  |  |  | $ 70,300,000 |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 4.125% |
Debt Instrument, Periodic Payment, Principal |  |  | $ 4,700,000 |  |  |  |  |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | US Bank [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.75% |  |  |  |  |  |
Ten-year Treasury Note [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.75% |  |  |  |  |
Debt Instrument, Term |  |  |  | 10 years |  |  |  |  |
Five-year Treasury Note [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.50% |  |  |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |  |  |  |

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