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Summary of Significant Accounting Policies (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Reserve requirements for banking subsidiaries |  | $ 6,600 | $ 6,600 |
Investment in qualified affordable housing projects |  | $ 1,000 | 1,400 |
Number of reportable business segments | segment |  | 3 |  |
Retained earnings |  | $ 319,396 | 265,007 |
Noninterest income |  | $ 77,449 | 69,204 | $ 68,808
Reclassification due to the adoption of ASU No. 2018-02 |  |  | 0 |
Minimum | Core deposit intangible |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization period for other intangible assets (in years) |  | 5 years |  |
Minimum | Covenants Noncompete |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization period for other intangible assets (in years) |  | 3 years |  |
Minimum | Customer relationships |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization period for other intangible assets (in years) |  | 6 years |  |
Maximum | Core deposit intangible |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization period for other intangible assets (in years) |  | 10 years |  |
Maximum | Covenants Noncompete |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization period for other intangible assets (in years) |  | 6 years |  |
Maximum | Customer relationships |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization period for other intangible assets (in years) |  | 15 years |  |
Building | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful (in years) |  | 10 years |  |
Building | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful (in years) |  | 39 years |  |
Furniture, fixtures, and equipment | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful (in years) |  | 2 years |  |
Furniture, fixtures, and equipment | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful (in years) |  | 20 years |  |
Accounting Standards Update 2014-09 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Adoption of ASU 2016-01 | $ 1,780 |  |  |
Accounting Standards Update 2016-01 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Adoption of ASU 2016-01 | 0 |  |  |
Accounting Standards Update 2018-02 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Reclassification due to the adoption of ASU No. 2018-02 |  |  | 10,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Retained earnings | 1,800 |  |  |
Insurance Business Segment | Contingent Consideration | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Noninterest income | 1,800 |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Reclassification due to the adoption of ASU No. 2018-02 |  |  | $ (9,958) |
Accumulated Other Comprehensive (Loss) Income | Accounting Standards Update 2016-01 |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Adoption of ASU 2016-01 | $ 65 | $ 65 |  |

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