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Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Within one year, amortized cost | $ 908 |
Within one year, estimated fair value | 925 |
After one year through five years, amortized cost | 14,955 |
After one year through five years, estimated fair value | 15,287 |
After five years through ten years, amortized cost | 39,209 |
After five years through ten years, estimated fair value | 40,256 |
After ten years, amortized cost | 162,040 |
After ten years, estimated fair value | 168,542 |
Total securities with single maturity date, amortized cost | 217,112 |
Total securities with single maturity date, estimated fair value | 225,010 |
Amortized Cost | 520,905 |
Available-for-sale securities | 528,127 | $ 547,749
U.S. Government agencies |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 63,921 |
Investment securities not due at a single maturity date, estimated fair value | 64,421 |
Amortized Cost | 63,921 | 69,005
U.S. Government agencies collateralized by residential mortgage obligations |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 193,644 |
Investment securities not due at a single maturity date, estimated fair value | 191,903 |
Amortized Cost | 193,644 | 181,785
Private label mortgage backed securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 38,728 |
Investment securities not due at a single maturity date, estimated fair value | 39,314 |
Amortized Cost | 38,728 | $ 1,807
Other equity securities |  |
Schedule of Available-for-sale Securities |  |
Investment securities not due at a single maturity date, amortized cost | 7,500 |
Investment securities not due at a single maturity date, estimated fair value | $ 7,479 |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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