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Note 9 - Borrowed Funds (Details Textual) |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 14, 2017 USD ($) | Nov. 04, 2017 USD ($) | Oct. 12, 2017 USD ($) | Jul. 14, 2017 USD ($) | Nov. 23, 2014 | Mar. 13, 2014 USD ($) | Nov. 23, 2004 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Securities Sold under Agreements to Repurchase |  |  |  |  |  |  |  | $ 100,000,000 | $ 350,000,000 |
Weighted Average Rate Of Securities Sold Under Agreements |  |  |  |  |  |  |  | 2.86% | 4.06% |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | $ 430,000,000 | $ 350,000,000 |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.75% | 3.50% |  |  |  |
Threshold for Deferred Bonus |  |  |  |  |  |  | $ 225,000 |  |  |
Amount of Deferred Bonus Accrued in Other Liabilities |  |  |  |  |  | $ 300,000 | $ 610,000 |  |  |
Accrued Interest on Deferred Bonus |  |  |  |  | 5.06% | 5.02% | 7.00% |  |  |
Interest Expense, Other |  |  |  |  |  |  |  | 87,000 | 83,000 | $ 79,000
Accrued Bonuses |  |  |  |  |  |  |  | 1,800,000 | 1,700,000 |
SinoPac Bancorp [Member] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 100,000,000 | $ 100,000,000 |  | $ 285,324,000 |  |  |  |  |  |
Business Combination, Deferred Payments |  |  |  |  |  |  |  | $ 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% |  |
Mature in March 2018 [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | $ 30,000,000 |  |
Mature in April 2018 [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | 15,000,000 |  |
Mature in July 2018 [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | 5,000,000 |  |
Mature in October 2018 [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | 5,000,000 |  |
Mature in December 2019 [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | $ 50,000,000 |  |
Business Combination, Deferred Payments [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 2.80% |  |
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, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 3.125% |  |
Debt Instrument, Face Amount |  |  | $ 75,000,000 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Treasury Note [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 10 years | 5 years |  |  |  |
Over-night Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | $ 325,000,000 | $ 275,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  |  |  | 1.41% | 0.55% |
Non Overnight Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Advances from Federal Home Loan Banks |  |  |  |  |  |  |  | $ 105,000,000 | $ 75,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  |  |  |  |  |  |  | 1.41% | 1.48% |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |  |  |  |  |
Investment Securities Pledged As Collateral |  |  |  |  |  |  |  | $ 108,400,000 | $ 372,000,000 |
Fixed Rate Non-callable Securities Sold Under Agreements to Repurchase [Member] |  |  |  |  |  |  |  |  |  |
Securities Sold under Agreements to Repurchase |  |  |  |  |  |  |  | $ 100,000,000 | $ 150,000,000 |
Weighted Average Rate Of Securities Sold Under Agreements |  |  |  |  |  |  |  | 2.86% | 2.81% |
Number Of Securities Sold Under Agreements To Repurchase |  |  |  |  |  |  |  | 2 | 3 |
Fixed Rate Non-callable Securities Sold Under Agreements to Repurchase [Member] | Mature in June 2018 [Member] |  |  |  |  |  |  |  |  |  |
Securities Sold under Agreements to Repurchase |  |  |  |  |  |  |  | $ 50,000,000 |  |
Fixed Rate Non-callable Securities Sold Under Agreements to Repurchase [Member] | Mature in July 2018 [Member] |  |  |  |  |  |  |  |  |  |
Securities Sold under Agreements to Repurchase |  |  |  |  |  |  |  | $ 50,000,000 |  |

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