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Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 366,487 | $ 350,029
Gross unrealized gains | 8,169 | 4,484
Gross unrealized losses | (230) | (1,075)
Estimated fair value | 374,426 | 353,438
U. S. treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 6,008 | 6,517
Gross unrealized gains | 22 | 1
Gross unrealized losses | 0 | (1)
Estimated fair value | 6,030 | 6,517
Common stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 458 | 580
Gross unrealized gains | 544 | 906
Gross unrealized losses | 0 | 0
Estimated fair value | 1,002 | 1,486
U. S. federal agency obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 27,188 | 30,064
Gross unrealized gains | 167 | 43
Gross unrealized losses | (6) | (187)
Estimated fair value | 27,349 | 29,920
Municipal obligations, tax-exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 160,122 | 135,341
Gross unrealized gains | 3,907 | 2,671
Gross unrealized losses | (181) | (71)
Estimated fair value | 163,848 | 137,941
Municipal obligations, taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 71,680 | 81,999
Gross unrealized gains | 1,949 | 472
Gross unrealized losses | (1) | (581)
Estimated fair value | 73,628 | 81,890
Agency mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 91,331 | 85,829
Gross unrealized gains | 1,580 | 391
Gross unrealized losses | (42) | (235)
Estimated fair value | 92,869 | 85,985
Certificates of deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 9,700 | 9,699
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 9,700 | $ 9,699

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