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Note 10 - Borrowed Funds (Details Textual) - USD ($) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 12, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Nov. 14, 2017
Advances from Federal Home Loan Banks, Total |  | $ 315,000,000 | $ 430,000,000 |
SinoPac Bancorp [Member] |  |  |  |
Business Combination, Deferred Payments |  | $ 35,200,000 |  | $ 35,400,000
Business Combination, Deferred Payments, Disbursed Rate, In Next Twelve Months |  | 50.00% |  |
Business Combination, Deferred Payments, Disbursed Rate, In Year Two |  | 30.00% |  |
Business Combination, Deferred Payments, Disbursed Rate, In Year Three |  | 20.00% |  |
Debt Instrument, Face Amount |  | $ 18,300,000 | $ 35,200,000 |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.39% |  |
Mature in October 2018 [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 5,000,000 |  |
Mature in December 2019 [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | 50,000,000 |  |
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% |  |
Term Loan [Member] | US Bank [Member] |  |  |  |
Debt Instrument, Face Amount | $ 75,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.875% | 3.125% |
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% |  |  |
Over-night Borrowings [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 240,000,000 | $ 325,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  | 2.33% | 1.41% |
Non Overnight Borrowings [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 75,000,000 | $ 105,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  | 1.99% | 1.41% |

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