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Investment Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 350,029 | $ 346,078
Gross unrealized gains | 4,484 | 4,363
Gross unrealized losses | (1,075) | (1,510)
Estimated fair value | 353,438 | 348,931
U. S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 6,517 | 6,530
Gross unrealized gains | 1 | 1
Gross unrealized losses | (1) | (1)
Estimated fair value | 6,517 | 6,530
Common stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 580 | 588
Gross unrealized gains | 906 | 695
Gross unrealized losses | 0 | 0
Estimated fair value | 1,486 | 1,283
U. S. federal agency obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 30,064 | 25,983
Gross unrealized gains | 43 | 34
Gross unrealized losses | (187) | (274)
Estimated fair value | 29,920 | 25,743
Municipal obligations, tax exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 135,341 | 108,752
Gross unrealized gains | 2,671 | 1,937
Gross unrealized losses | (71) | (180)
Estimated fair value | 137,941 | 110,509
Municipal obligations, taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 81,999 | 63,728
Gross unrealized gains | 472 | 544
Gross unrealized losses | (581) | (350)
Estimated fair value | 81,890 | 63,922
Agency mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 85,829 | 135,072
Gross unrealized gains | 391 | 1,152
Gross unrealized losses | (235) | (705)
Estimated fair value | 85,985 | 135,519
Certificates of deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 9,699 | 5,425
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 9,699 | $ 5,425

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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