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Note 3 - Investment Securities Available-for-sale | 3 Months Ended
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Mar. 31, 2017
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Note 3 . Investment Securities Available-for-Sale Amortized cost and estimated fair value of securities available-for-sale are summarized as follows:
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
March 31, 2017 |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 149,160 |  |  | $ | 315 |  |  | $ | 1,567 |  |  | $ | 147,908 |
Residential mortgage backed securities |  |  | 299,757 |  |  |  | 478 |  |  |  | 3,310 |  |  |  | 296,925 |
Municipal bonds |  |  | 43,255 |  |  |  | 1,369 |  |  |  | 15 |  |  |  | 44,609 |
Corporate bonds |  |  | 10,013 |  |  |  | 134 |  |  |  | - |  |  |  | 10,147 |
Other equity investments |  |  | 218 |  |  |  | - |  |  |  | - |  |  |  | 218 |
|  | $ | 502,403 |  |  | $ | 2,296 |  |  | $ | 4,892 |  |  | $ | 499,807 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
December 31, 2016 |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 107,425 |  |  | $ | 519 |  |  | $ | 1,802 |  |  | $ | 106,142 |
Residential mortgage backed securities |  |  | 329,606 |  |  |  | 324 |  |  |  | 3,691 |  |  |  | 326,239 |
Municipal bonds |  |  | 94,607 |  |  |  | 1,723 |  |  |  | 400 |  |  |  | 95,930 |
Corporate bonds |  |  | 9,508 |  |  |  | 82 |  |  |  | 11 |  |  |  | 9,579 |
Other equity investments |  |  | 218 |  |  |  | - |  |  |  | - |  |  |  | 218 |
|  | $ | 541,364 |  |  | $ | 2,648 |  |  | $ | 5,904 |  |  | $ | 538,108 |
|  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
March 31, 2016 |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 54,948 |  |  | $ | 774 |  |  | $ | 100 |  |  | $ | 55,622 |
Residential mortgage backed securities |  |  | 305,351 |  |  |  | 2,073 |  |  |  | 612 |  |  |  | 306,812 |
Municipal bonds |  |  | 104,840 |  |  |  | 5,069 |  |  |  | - |  |  |  | 109,909 |
Corporate bonds |  |  | 15,085 |  |  |  | - |  |  |  | 147 |  |  |  | 14,938 |
Other equity investments |  |  | 310 |  |  |  | 18 |  |  |  | - |  |  |  | 328 |
|  | $ | 480,534 |  |  | $ | 7,934 |  |  | $ | 859 |  |  | $ | 487,609 |
In addition, at March 31 , 2017, the Company held $25.6 million in equity securities in a combination of Federal Reserve Bank (“FRB”) and Federal Home Loan Bank (“FHLB”) stocks, which are required to be held for regulatory purposes and which are not marketable, and therefore are carried at cost. Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss position are as follows:
|  |  |  |  |  | Less than |  |  | 12 Months |  |  |  |  |  |  |  |  |
|  |  |  |  |  | 12 Months |  |  | or Greater |  |  | Total |
|  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |
March 31, 2017 |  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(dollars in thousands) |  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U. S. agency securities |  |  | 30 |  |  | $ | 98,493 |  |  | $ | 1,535 |  |  | $ | 3,661 |  |  | $ | 32 |  |  | $ | 102,154 |  |  | $ | 1,567 |
Residential mortgage backed securities |  |  | 114 |  |  |  | 229,743 |  |  |  | 2,730 |  |  |  | 20,711 |  |  |  | 580 |  |  |  | 250,454 |  |  |  | 3,310 |
Municipal bonds |  |  | 4 |  |  |  | 3,487 |  |  |  | 15 |  |  |  | - |  |  |  | - |  |  |  | 3,487 |  |  |  | 15 |
|  |  | 148 |  |  | $ | 331,723 |  |  | $ | 4,280 |  |  | $ | 24,372 |  |  | $ | 612 |  |  | $ | 356,095 |  |  | $ | 4,892 |
|  |  |  |  |  | Less than |  |  | 12 Months |  |  |  |  |  |  |  |  |
|  |  |  |  |  | 12 Months |  |  | or Greater |  |  | Total |
|  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |  |  | Estimated |  |  |  |  |
December 31, 2016 |  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(dollars in thousands) |  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U. S. agency securities |  |  | 27 |  |  | $ | 88,991 |  |  | $ | 1,764 |  |  | $ | 3,768 |  |  | $ | 38 |  |  | $ | 92,759 |  |  | $ | 1,802 |
Residential mortgage backed securities |  |  | 112 |  |  |  | 232,347 |  |  |  | 3,110 |  |  |  | 19,402 |  |  |  | 581 |  |  |  | 251,749 |  |  |  | 3,691 |
Municipal bonds |  |  | 16 |  |  |  | 34,743 |  |  |  | 400 |  |  |  | - |  |  |  | - |  |  |  | 34,743 |  |  |  | 400 |
Corporate bonds |  |  | 2 |  |  |  | 4,998 |  |  |  | 11 |  |  |  | - |  |  |  | - |  |  |  | 4,998 |  |  |  | 11 |
|  |  | 157 |  |  | $ | 361,079 |  |  | $ | 5,285 |  |  | $ | 23,170 |  |  | $ | 619 |  |  | $ | 384,249 |  |  | $ | 5,904 |
The unrealized losses that exist are generally the result of changes in market interest rates and interest spread relationships since original purchases. The weighted average duration of debt securities, which comprise 99.9% of total investment securities, is relatively short at 3.6 years. If quoted prices are not available, fair value is measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions. The Company does not believe that the investment securities that were in an unrealized loss position as of March 31, 2017 represent an other-than-temporary impairment. The Company does not intend to sell the investments and it is more likely than not that the Company will not have to sell the securities before recovery of its amortized cost basis, which may be at maturity. The amortized cost and estimated fair value of investments available-for-sale at March 31, 2017 and December 31, 2016 by contractual maturity are shown in the table below. Expected maturities for residential mortgage backed securities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | March 31, 2017 |  |  | December 31, 2016 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
(dollars in thousands) |  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
U. S. agency securities maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 82,631 |  |  | $ | 81,401 |  |  | $ | 83,885 |  |  | $ | 82,548 |
After one year through five years |  |  | 47,693 |  |  |  | 47,725 |  |  |  | 20,736 |  |  |  | 20,897 |
Five years through ten years |  |  | 9,071 |  |  |  | 9,017 |  |  |  | 2,804 |  |  |  | 2,697 |
After ten years |  |  | 9,765 |  |  |  | 9,765 |  |  |  | - |  |  |  | - |
Residential mortgage backed securities |  |  | 299,757 |  |  |  | 296,925 |  |  |  | 329,606 |  |  |  | 326,239 |
Municipal bonds maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  |  | 831 |  |  |  | 837 |  |  |  | 1,056 |  |  |  | 1,070 |
After one year through five years |  |  | 19,913 |  |  |  | 20,801 |  |  |  | 45,808 |  |  |  | 46,865 |
Five years through ten years |  |  | 21,437 |  |  |  | 21,794 |  |  |  | 46,668 |  |  |  | 46,839 |
After ten years |  |  | 1,074 |  |  |  | 1,177 |  |  |  | 1,075 |  |  |  | 1,156 |
Corporate bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After one year through five years |  |  | 8,513 |  |  |  | 8,647 |  |  |  | 8,008 |  |  |  | 8,079 |
After ten years |  |  | 1,500 |  |  |  | 1,500 |  |  |  | 1,500 |  |  |  | 1,500 |
Other equity investments |  |  | 218 |  |  |  | 218 |  |  |  | 218 |  |  |  | 218 |
|  | $ | 502,403 |  |  | $ | 499,807 |  |  | $ | 541,364 |  |  | $ | 538,108 |
For the three months ended March 31, 2017 , gross realized gains on sales of investments securities were $723 thousand and gross realized losses on sales of investment securities were $218 thousand. For the three months ended March 31, 2016, gross realized gains on sales of investments securities were $624 thousand and there were no gross realized losses on sales of investment securities. Proceeds from sales and calls of investment securities for the three months ended March 31, 2017 were $51.2 million, and in 2016 were $15.7 million. The carrying value of securities pledged as collateral for certain government deposits, securities sold under agreements to repurchase, and certain lines of credit with correspondent banks at March 31, 2017 was $440.1 million, which is well in excess of required amounts in order to operationally provide significant reserve amounts for new business. As of March 31, 2017 and December 31, 2016, there were no holdings of securities of any one issuer, other than the U.S. Government and U.S. agency securities, which exceeded ten percent of shareholders’ equity.

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